EP0155207B1 - Verfahren und Anlage zur Destillation mit Hilfe von aufeinanderfolgenden Trennungen - Google Patents
Verfahren und Anlage zur Destillation mit Hilfe von aufeinanderfolgenden Trennungen Download PDFInfo
- Publication number
- EP0155207B1 EP0155207B1 EP85400300A EP85400300A EP0155207B1 EP 0155207 B1 EP0155207 B1 EP 0155207B1 EP 85400300 A EP85400300 A EP 85400300A EP 85400300 A EP85400300 A EP 85400300A EP 0155207 B1 EP0155207 B1 EP 0155207B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- column
- series
- columns
- residue
- gasoline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000926 separation method Methods 0.000 title claims abstract description 14
- 238000004821 distillation Methods 0.000 title claims description 15
- 239000003502 gasoline Substances 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 36
- 239000003350 kerosene Substances 0.000 claims abstract description 30
- 238000005292 vacuum distillation Methods 0.000 claims abstract description 29
- 239000003208 petroleum Substances 0.000 claims abstract description 23
- 238000009434 installation Methods 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 10
- 238000003303 reheating Methods 0.000 claims abstract description 6
- 230000000750 progressive effect Effects 0.000 claims abstract description 4
- 238000010992 reflux Methods 0.000 claims description 51
- 239000003209 petroleum derivative Substances 0.000 claims description 7
- 230000006641 stabilisation Effects 0.000 claims description 6
- 238000011105 stabilization Methods 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 3
- 238000009835 boiling Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 6
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 238000005194 fractionation Methods 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000000446 fuel Substances 0.000 description 9
- 239000000498 cooling water Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000002283 diesel fuel Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 239000000686 essence Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G7/00—Distillation of hydrocarbon oils
Definitions
- the present invention relates to a process for the distillation of petroleum or synthetic origin oil by progressive separation, in which the charge preheated by heat exchange is prefractionated in successive phases in at least one column operating at a pressure of between 1 and 5 bar abs ., as well as an installation for implementing the method.
- Such processes are known using recovery heat to save energy and effecting a prior separation of varying degrees from light fractions, such as light petroleum gases, gasolines and kerosene before atmospheric distillation.
- the feed residue from these columns is necessarily reheated in one or more fuel ovens before undergoing distillation in these columns.
- the oil separated from the gaseous hydrocarbons is reheated in an oven before being treated in an atmospheric distillation column.
- the object of the process according to the present invention is to provide improvements to the abovementioned processes by carrying out a more gradual separation of petroleum fractions before and after atmospheric distillation to allow better use of heating by means of recovery heat.
- the idea which is at the basis of the invention resides in the observation that by proceeding by a succession of progressive separations accomplished in a series of columns of relatively reduced volume, one arrives at a better use of the heat of recovery, thanks with measured and judiciously distributed heat gains.
- the energy saving will be essentially due to the use of the recovery heat to operate successive separations and to the reduction in the volume of the effluent subjected to heating. by an external thermal source.
- the distillation process according to the invention in which the charge preheated by heat exchange is prefractionated in successive phases in at least one distillation column operating at a pressure between 1 and 5 bar abs. by successively separating at the head of a series of columns each of which is fed by a residue from the previous column from increasingly heavy petroleum fractions and by collecting at the bottom of the last column of this series a so-called atmospheric residue is characterized in that said residue is then treated in a vacuum distillation zone comprising a reheating of the charge in an oven and in that each cut collected at the top of each column of this first series of columns individually feeds a column of a second series of columns whose distillates are common petroleum products.
- the atmospheric residue collected at the bottom of the last column of the first series is reheated in an oven, then treated in a vacuum distillation column.
- said residue feeds, without external heat input, a first vacuum distillation column, the residue of which, after reheating in an oven, is treated in a second vacuum distillation column.
- the method according to the invention allows great flexibility of operation according to the production criteria set.
- a column of the second series it is conceivable to feed at least one column of the second series with volatile effluents from the two columns of the first series.
- a grouping of two columns of the second series will be carried out, either by superimposing them for example in a single column of fractionation of essences with lateral withdrawal, or by regrouping the two columns placed downstream of the column of fractionation of essences and producing heavy gasoline and kerosene.
- an additional column can be done according to other production criteria. For example, in the case where the production of a solvent is required lying between heavy petrol and kerosene, an additional column could be inserted before the last column of the first series supplying an additional column placed before the last last column of the second series.
- a first of the columns of the second series is a gasoline stabilization column whose volatile effluent feeds a light petroleum gas fractionation plant and whose residue joins the gasoline cut from the second column of the first series to feed a second column of the second series.
- a second column of the second series is a column for fractionating gasolines, the residue of which consists of a heavy gasoline which joins the volatile fraction of a third column of the second series.
- the residue from the gasoline fractionation column feeds the next column of the same series.
- the initial charge, the residues circulating between the columns of the first series and the effluents circulating between the columns of the second series are preferably preheated by exchange of sensible and latent heat given up. by other effluents, excluding the supply of heat, for example by means of an oven.
- the supply of heat for reboiling columns is advantageously effected by heat exchange of the same kind.
- part of this addition can be carried out by exchange with a fraction of the residue from the last vacuum distillation column that is permanently recycled to the furnace supply.
- the invention also relates to an installation for the implementation of the above method, characterized in that four columns of the first series of columns are connected by their head outputs individually to the four columns of the second series of columns, the first is a gasoline stabilization column connected by a head outlet to a light petroleum gas fractionation plant and by a bottom outlet to a second column which is a gasoline fractionation column connected by the head and gas outlets melts to gasoline storage tanks, the third column being a separation column for heavy gasoline and kerosene connected to storage tanks and the fourth column being supplied by the top fraction of the last column called atmospheric from the first series of columns being also connected to the storage tanks, in that the last atmospheric column of the first series is a he reflux column connected to a stripper connected to a so-called atmospheric diesel storage tank and which is provided with a bottom outlet for the so-called atmospheric residue connected through a furnace heated with fuel to the supply of a column of vacuum distillation connected to storage tanks.
- the so-called atmospheric column is connected by a bottom outlet to a first vacuum distillation column provided with lateral withdrawal means and a bottom outlet connected through the furnace to a second distillation column under vacuum, the two vacuum distillation columns being connected by means of lateral withdrawal to diesel and distillate storage tanks.
- an additional column is interposed between the second and third column of the first series, the head output of which feeds an additional column interposed between the second and third column of the second series, optionally supplied by the output bottom of the second column of the second series, and the head outlet of which is connected to a medium petrol storage tank.
- an additional column is interposed between the third and the fourth column of the first series whose head outlet feeds an additional column interposed between the third and fourth column of the second series whose head outlet is connected to a solvent storage tank, the boiling point of which is between that of heavy petrol and that of kerosene.
- the second and third columns of the second series are superimposed columns in a single gasoline fractionation tower supplying via the bottom outlet a fourth column of the second series, each column being connected to reservoirs respective storage.
- the third and fourth column of the second series are grouped together in a single column, the power supplies of which are connected to the head outputs of the third and the fourth column of the first series.
- the supply of the third column of the second series which is a separation column for heavy petrol and kerosene, is connected to the bottom outlet of the column which precedes it in the same series and at the exit of the third column of the first series.
- the installation includes two series of columns.
- the first series is composed of distillation columns working at atmospheric pressure or higher than atmospheric pressure C01, C02. C03 and C10 equipped with a stripper C11, each of which is fed with a residue from the previous column and whose head fractions each individually feed one of the columns of the second series of distillation columns C07, C04, C05 and C06.
- the bottom of the last column C10 called the atmospheric column, supplies atmospheric residue to a first vacuum distillation column C12, the residue of which is preheated in a single fuel oven is introduced into a second vacuum distillation column C13.
- the columns of the first series of columns are distillation columns with trays for the separation of the top and bottom fractions and their operating conditions are regulated, as regards temperature and pressure, so that the released volatile fractions are heavier and heavier.
- the volatile fraction of column C01 composed of the totality of light petroleum gases and part of the gasoline feeds column C07 of the second series which is a gasoline stabilization column, the volatile fraction of which feeds a fractionation installation of light petroleum gases.
- the volatile fraction from column C02 joins the residue from column C07 and supplies gasoline alone to column C04, which is a column for the fractionation of gasolines, whose head effluent is a light gasoline and the residue a heavy gasoline.
- the volatile fraction of column C03 composed of a remainder of gasoline and kerosene feeds column C05 which extracts heavy gasoline therefrom as volatile fraction and kerosene as residue.
- the last column C10 of the first series is an atmospheric reflux column whose bottom is stripped with water vapor. A C11 stripper is connected to the upper part of the column.
- the volatile fraction from column C10 supplies column C06 with an effluent containing gasoline, kerosene and water.
- the residue from column C06 is kerosene, which joins the residue from column C05 to be stored.
- the volatile fraction after separation of the water, constitutes the rest of the heavy gasoline which is sent to storage.
- the stripper C11 in column C10 makes it possible to rid the light atmospheric diesel of the volatile fractions before shipment to storage.
- the atmospheric residue stripped with water vapor at the bottom of column C10 is introduced into a first vacuum distillation column C12, where three volatile fractions are drawn off laterally at different column levels: heavy diesel, vacuum diesel and a vacuum distillate, as well as a residue.
- the residue from column C12 is heated in an oven supplied with fuel, then introduced into a second vacuum distillation column C13, which separates several cups of distillates under vacuum, as well as a residue under vacuum.
- the crude is desalted in a two-stage desalter, B08, B09, then heated under pressure to 157 ° C (F2) in the exchangers E15 (low pressure steam), E16 (vacuum distillates, F32) and E17 ( atmospheric diesel) it supplies column C01 at 2 bars abs.
- the reflux is pumped from the reflux flask B01 using the pump P04 and returned to the top of the column C01.
- the bottom of the column, F11 is taken up by the pump P08, heated to 320 ° C in the exchanger E42 (vacuum residue), then mixed with 100 t / h of vacuum residue at 380 ° C, F12, in order to to supply column C10 at 2.3 bar abs.
- the bottom of this column is stripped by 7.5 t / h of low pressure steam.
- This column is provided with a reflux circulating under withdrawal of the diesel fuel, F13, which condenses the internal reflux necessary for the proper functioning of the column.
- a side stripper C11 makes it possible to obtain 59 t / h of atmospheric diesel, F14, consisting of a cut of heavy fuel, kerosene and water vapor.
- the exchanger E19, the balloon B10 and the pump P09 ensure the reflux of the column. This reflux ensures the fractionation between the kerosene and diesel cuts.
- the diesel fuel produced is cooled to 45 ° C in exchangers E17, E14, E07 and E59 (cooling water).
- This column produces 80 t / h of atmospheric diesel, F21, whose cooling to 45 ° C is ensured by the exchanger E60 (cooling water), 38 t / h of vacuum diesel, F22, cooled to 45 ° C in exchangers E08, E55 (oven air preheater) and 24 t / h of vacuum distillate, F23, from which the available heat is recovered up to 160 ° C in the exchanger E18.
- the column is vacuumed by a pre-condenser and a group of ejector-condensers common with column C13.
- the process water is taken from the tank B11 by the pump P25 and sent to a water treatment installation.
- the heat recovery up to 160 ° C contained in these flows takes place in the exchanger E16, the vacuum distillate No. 4 having been previously cooled in the exchanger E29.
- the bottom of the column is stripped using 9 t / h of very low pressure steam.
- the vacuum residue produced at the bottom of the tower is taken up by the pump P26, part of this residue under hot vacuum is recycled upstream of the column C10.
- the vacuum residue is successively cooled to 230 ° C in the exchangers E42, E40, E38, E46 (heating of the column C05), E37, E32 and E30. Part of this residue, after the E42 exchanger, is recycled at the bottom of the tower, in order to adjust the temperature, F34.
- the steam distillate (F4) from the CO1 column is cooled to 40 ° C in the exchanger E61 (cooling water).
- the liquid and vapor phases obtained are separated in flask B12.
- the vapor phase is heated to 60 ° C. F35, in the exchanger E50 (heavy petrol) before being compressed to 4 bar abs. using compressor K01 to supply column C07.
- the liquid phase is taken up by the pump P31, heated to 80 ° C in the exchanger E51 (heavy petrol) before feeding the column C07, F36.
- the first vacuum distillation column C12 (FIG. 2) can be omitted and the atmospheric residue from the atmospheric column C10, passing through the oven, passed through the second vacuum distillation column C13, including the effluents contain both heavy and vacuum gas oils, as well as distillates.
- the columns C04 and COS are grouped together in a single fractionation tower for gasolines and kerosene with lateral withdrawal, fed by the effluents from columns C02 and C03 of the first series of columns.
- an additional column C04 'and an additional column C02' were inserted respectively in the second and the first series of columns.
- This diagram applies particularly, when one wants to favor the production of the average gasoline.
- Column C04 ' is fed by the residue from column C04 and by volatile effluents from column C02'.
- the column C05 separating the heavy gasoline from the kerosene is fed by the volatile effluents from the column C03 and by the residue from the column C04.
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Claims (23)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT85400300T ATE28660T1 (de) | 1984-02-24 | 1985-02-20 | Verfahren und anlage zur destillation mit hilfe von aufeinanderfolgenden trennungen. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8402806 | 1984-02-24 | ||
| FR8402806A FR2560204A1 (fr) | 1984-02-24 | 1984-02-24 | Procede et installation de distillation de petrole par separations progressives |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0155207A1 EP0155207A1 (de) | 1985-09-18 |
| EP0155207B1 true EP0155207B1 (de) | 1987-07-29 |
Family
ID=9301348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85400300A Expired EP0155207B1 (de) | 1984-02-24 | 1985-02-20 | Verfahren und Anlage zur Destillation mit Hilfe von aufeinanderfolgenden Trennungen |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4664785A (de) |
| EP (1) | EP0155207B1 (de) |
| JP (1) | JPS60210695A (de) |
| AT (1) | ATE28660T1 (de) |
| AU (1) | AU568722B2 (de) |
| CA (1) | CA1250244A (de) |
| DE (1) | DE3560403D1 (de) |
| FR (1) | FR2560204A1 (de) |
| IN (1) | IN163181B (de) |
| NO (1) | NO167043C (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10356245B4 (de) * | 2003-12-02 | 2007-01-25 | Alphakat Gmbh | Verfahren zur Erzeugung von Dieselöl aus kohlenwasserstoffhaltigen Reststoffen sowie eine Vorrichtung zur Durchführung dieses Verfahrens |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2594349B1 (fr) * | 1986-02-18 | 1989-11-17 | Elf Aquitaine | Colonne de distillation a circulation helicoidale de liquide avec espacement dissymetrique des plateaux |
| RU2100403C1 (ru) * | 1996-05-12 | 1997-12-27 | Валерий Георгиевич Леонтьевский | Способ фракционирования нефти и установка для его осуществления |
| JP4495791B2 (ja) * | 1998-07-03 | 2010-07-07 | 日揮株式会社 | コンバインドサイクル発電システム |
| RU2145971C1 (ru) * | 1998-12-15 | 2000-02-27 | Леонтьевский Валерий Георгиевич | Способ поточной перегонки мазута и устройство для его осуществления |
| KR100326588B1 (ko) * | 1998-12-28 | 2002-10-12 | 에스케이 주식회사 | 근적외선분광분석기술을활용한자동원유분석방법 |
| FR2791133B1 (fr) * | 1999-03-19 | 2001-10-12 | Multidyn | Procede et dispositif de mesure d'un couple exerce sur une piece soumise a des efforts de couple et de flexion |
| RU2159792C1 (ru) * | 1999-03-29 | 2000-11-27 | Предприятие "Астраханьгазпром" РАО "Газпром" | Способ разделения газового конденсата |
| KR20020051940A (ko) * | 1999-12-10 | 2002-06-29 | 시게히사 요시히로 | 석유 처리 방법 및 장치 |
| RU2191800C2 (ru) * | 2000-01-05 | 2002-10-27 | Общество с ограниченной ответственностью "Интербизнеспроект" | Способ первичной перегонки углеводородного сырья (газового конденсата и нефти) |
| RU2211853C2 (ru) * | 2001-07-23 | 2003-09-10 | Общество с ограниченной ответственностью "Интербизнеспроект" | Атмосферно-вакуумная установка получения топливных фракций из углеводородного сырья |
| RU2224004C1 (ru) * | 2002-08-01 | 2004-02-20 | Коломыцев Владимир Николаевич | Устройство для получения углеводородных продуктов |
| US20120168352A1 (en) * | 2010-12-30 | 2012-07-05 | Kellogg Brown & Root Llc | Systems and methods for processing hydrocarbon feedstocks |
| US9677006B2 (en) | 2013-06-24 | 2017-06-13 | Fluor Technologies Corporation | Multiple preflash and exchanger (MPEX) network system for crude and vacuum units |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1735558A (en) * | 1924-07-15 | 1929-11-12 | Youker Malcolm Phillip | Rectifying process |
| US1954839A (en) * | 1924-07-15 | 1934-04-17 | Phillips Petroleum Co | Rectifying process |
| US1780286A (en) * | 1927-07-01 | 1930-11-04 | Texas Co | Treating hydrocarbon oils |
| US1744599A (en) * | 1927-11-11 | 1930-01-21 | Texas Co | Treating hydrocarbon oil |
| US1997675A (en) * | 1930-08-28 | 1935-04-16 | Standard Oil Co | Distillation |
| US2904510A (en) * | 1956-07-10 | 1959-09-15 | Exxon Research Engineering Co | Process for treating catalytic cracking recycle fractions |
| CH387207A (de) * | 1960-12-10 | 1965-01-31 | Inventa Ag | Verfahren zur Fraktionierung von Rohöl |
| US3320158A (en) * | 1964-11-06 | 1967-05-16 | Phillips Petroleum Co | Crude oil fractionation method |
| DE1768817B1 (de) * | 1968-07-03 | 1972-04-27 | Zieren Chemiebau Gmbh Dr A | Verfahren zur Reinigung von rohem Phthalsaeureanhydrid durch Destillation |
| US3567628A (en) * | 1968-10-25 | 1971-03-02 | Phillips Petroleum Co | Production of high flash point topped crude and high flash point asphalt |
| FR2258443B1 (de) * | 1974-01-17 | 1976-11-26 | Spie Batignolles | |
| US4082653A (en) * | 1976-11-17 | 1978-04-04 | Degraff Richard Raymond | Crude oil distillation process |
| DE3205802A1 (de) * | 1982-02-18 | 1983-08-25 | Edeleanu Gmbh, 6000 Frankfurt | Verfahren zur atmosphaerischen fraktionierenden destillation von rohoelen |
-
1984
- 1984-02-24 FR FR8402806A patent/FR2560204A1/fr not_active Withdrawn
-
1985
- 1985-02-13 IN IN119/DEL/85A patent/IN163181B/en unknown
- 1985-02-20 DE DE8585400300T patent/DE3560403D1/de not_active Expired
- 1985-02-20 AT AT85400300T patent/ATE28660T1/de not_active IP Right Cessation
- 1985-02-20 US US06/703,496 patent/US4664785A/en not_active Expired - Lifetime
- 1985-02-20 EP EP85400300A patent/EP0155207B1/de not_active Expired
- 1985-02-21 AU AU39040/85A patent/AU568722B2/en not_active Expired
- 1985-02-22 CA CA000474935A patent/CA1250244A/fr not_active Expired
- 1985-02-22 NO NO850736A patent/NO167043C/no not_active IP Right Cessation
- 1985-02-22 JP JP60034278A patent/JPS60210695A/ja active Granted
Non-Patent Citations (1)
| Title |
|---|
| Winnacker-Küchler chemische Technologie, Band 5, Organische Technologie I, 4. Auflage, Carl Hanser Verlag München, Wien 1981, p. 68+69 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10356245B4 (de) * | 2003-12-02 | 2007-01-25 | Alphakat Gmbh | Verfahren zur Erzeugung von Dieselöl aus kohlenwasserstoffhaltigen Reststoffen sowie eine Vorrichtung zur Durchführung dieses Verfahrens |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2560204A1 (fr) | 1985-08-30 |
| US4664785A (en) | 1987-05-12 |
| JPH0535200B2 (de) | 1993-05-25 |
| CA1250244A (fr) | 1989-02-21 |
| AU3904085A (en) | 1985-09-12 |
| AU568722B2 (en) | 1988-01-07 |
| JPS60210695A (ja) | 1985-10-23 |
| NO167043C (no) | 1991-09-25 |
| DE3560403D1 (en) | 1987-09-03 |
| EP0155207A1 (de) | 1985-09-18 |
| ATE28660T1 (de) | 1987-08-15 |
| NO850736L (no) | 1985-08-26 |
| IN163181B (de) | 1988-08-20 |
| NO167043B (no) | 1991-06-17 |
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