EP0200074A2 - Stabilisator für wässrige Aufschlämmungen - Google Patents

Stabilisator für wässrige Aufschlämmungen Download PDF

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Publication number
EP0200074A2
EP0200074A2 EP86105103A EP86105103A EP0200074A2 EP 0200074 A2 EP0200074 A2 EP 0200074A2 EP 86105103 A EP86105103 A EP 86105103A EP 86105103 A EP86105103 A EP 86105103A EP 0200074 A2 EP0200074 A2 EP 0200074A2
Authority
EP
European Patent Office
Prior art keywords
pet
coke
bentonite
stabilizer
aqueous suspensions
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.)
Granted
Application number
EP86105103A
Other languages
English (en)
French (fr)
Other versions
EP0200074B1 (de
EP0200074A3 (en
Inventor
Vincenzo Lagana'
Carlo Piccinini
Elio Donati
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SnamProgetti SpA
Original Assignee
SnamProgetti SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SnamProgetti SpA filed Critical SnamProgetti SpA
Publication of EP0200074A2 publication Critical patent/EP0200074A2/de
Publication of EP0200074A3 publication Critical patent/EP0200074A3/en
Application granted granted Critical
Publication of EP0200074B1 publication Critical patent/EP0200074B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L1/00—Liquid carbonaceous fuels
    • C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
    • C10L1/326—Coal-water suspensions

Definitions

  • the present Invention relates to a stabilizer for aqueous suspensions.
  • the present invention relates to a stabilizer for aqueous suspensions of pet-coke.
  • Pet-coke is a high heat value product with low content of ashes, and a great interest exists hence- in converting said pet-coke into a fluid product by dispersing it in liquids, in particular in water.
  • the aqueous suspensions of pet-coke can be stabilized by adding to them bentonite in amounts comprised within the range of from 0.2 to 3% by weight relatively to the weight of the suspension.
  • the concentration of pet-coke in water it is usually comprised within the range of from 50% to 80% by weight.
  • the suspension contains moreover normal fluidifiers, in particular those obtained by the sulphonation and salifying of coal tar, and possible condensation with formaldehyde, or the non-surfactant anionic polyelectrolytes, in particular those having alkyl-substituted polynuclear aromatic groups and having a molecular weight higher than 300 and preferably comprised within the range of from 500 to 3000.
  • normal fluidifiers in particular those obtained by the sulphonation and salifying of coal tar, and possible condensation with formaldehyde
  • non-surfactant anionic polyelectrolytes in particular those having alkyl-substituted polynuclear aromatic groups and having a molecular weight higher than 300 and preferably comprised within the range of from 500 to 3000.
  • the granulometry of pet-coke in the aqueous suspens on, it is such as to have particles of size lower than 300 ⁇ m, and preferably the suspension is formed by two groups of particles o different average size, the first group of particle: having an average size between 210 ⁇ m and 6t ⁇ m, whilst the particles of the second group have an average size comprised between 1/6 and 1/2( of the average size of the particles of the firs group.
  • the particles of the first group are at least 50% and up to 80% by weight of the total of the particles.
  • the bentonite is added tc the fluidifier-containing pet-coke in the step of pet coke grinding, or in the step of mixing with wate and additives.
  • the bentonite can be added eithe during the wet grinding step in which the coarse fractions are produced, or, preferably, during the wet grinding during which the finer (micronized fraction is produced.
  • a roc mill In order to obtain the coarser fraction, a roc mill is generally used, whilst to obtain the fine fraction a ball micronizer is used.
  • the end particle sizes of the two pet-coke fractions are those as above mentioned.
  • the wet milling to obtain the coarser fraction i preferably carried out by mixing the raw pet-coke to be ground with the wet-micronized fraction, con tinuining the grinding, until the size desired for the coarse fraction is reached. This is the grinding process adopted in Examples 2 and 3.
  • a slurry has been prepared with the coarse fraction and the micronized fraction, in the weight ratio of 65/35 at a concentration of pet-coke of 72.0% by weight, and with an amount of DAXAD 15 of 0.5%.
  • Bentonite has been metered into it in the amounts of respectively 0%, 1.0%, 1.5%, 2.0%, 2.5%.
  • ⁇ (P) is the viscosity in Poises computated as the shear stress / shear rate regression line between 70 and 130 s -1 of shear rate
  • K and n are related with each other by the relationship wherein T is the shear stress,y is the shear rate, K is the consistency index and n is the index describing the newtonian character of the suspension.
  • the determination of the static stability is carried out by pouring the coal suspension into a 170 x 24 mm plexiglas cylinder and keeping it resting for a determined time at constant temperature.
  • the cylinder is introduced in a freezer to cause the suspension to solidify.
  • the 150-mm high core is thex extracted from the cylinder and from its ends two samples of about 15 mm of height are drawn.
  • the two samples are then analyzed for the determination of the content of solids.
  • the % ratio of the solids content found in the top sample to that of the bottom sample allows to calculate the stability.
  • the static stability is expressed by a number comprised between 0 and 100.
  • the pet-coke used was that of Example 1.
  • the wet-micronization has been carried out a a concentration of 50% of solids, with an amount o DAXAD 15 corresponding to the concentration o 0.5%, as referred to the end rod milling.
  • the coarse/fine ratio in the end rod mitring ha was 65/35.
  • the end concentration of pet-coke has been o 71% by weight.
  • the pet-coke used was that of Example 1.
  • the whole amount of fluidifier additive DAXAI 15 has been added in the micronization step, so a to obtain in the end rod milling a concentration c 0.5%.
  • the bentonite amounts above listen correspond to 0%, 0.05%, 0,10%, 0.15%, 0.25% 0.35%, 0.45% in the end product.
  • the concentration of pet-coke in the end prod uct has resulted around 71%.
  • the optimum concentration of bentonite to be added is of 0.2 to 0.4%, referred to the end rod milling.

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)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
  • Liquid Carbonaceous Fuels (AREA)
  • Industrial Gases (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Coke Industry (AREA)
EP86105103A 1985-04-23 1986-04-14 Stabilisator für wässrige Aufschlämmungen Expired - Lifetime EP0200074B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT20456/85A IT1187660B (it) 1985-04-23 1985-04-23 Stabilizzante di sospensioni acquose
IT2045685 1985-04-23

Publications (3)

Publication Number Publication Date
EP0200074A2 true EP0200074A2 (de) 1986-11-05
EP0200074A3 EP0200074A3 (en) 1987-11-04
EP0200074B1 EP0200074B1 (de) 1990-02-07

Family

ID=11167220

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86105103A Expired - Lifetime EP0200074B1 (de) 1985-04-23 1986-04-14 Stabilisator für wässrige Aufschlämmungen

Country Status (14)

Country Link
EP (1) EP0200074B1 (de)
JP (1) JPH068420B2 (de)
AU (1) AU587610B2 (de)
BR (1) BR8601992A (de)
DD (1) DD244561A5 (de)
DE (1) DE3668908D1 (de)
ES (1) ES8802578A1 (de)
FI (1) FI861554A7 (de)
GR (1) GR860933B (de)
IN (1) IN167190B (de)
IT (1) IT1187660B (de)
NO (1) NO861561L (de)
SU (1) SU1731065A3 (de)
ZA (1) ZA862533B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4282922A (en) * 1980-05-16 1981-08-11 E. I. Du Pont De Nemours And Company Lead coated alumina fiber and lead matrix composites thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062694A (en) * 1975-07-14 1977-12-13 International Telephone And Telegraph Corporation Stable particulate suspensions
US4251230A (en) * 1978-10-26 1981-02-17 International Telephone And Telegraph Corporation Coal suspensions in organic liquids
US4375358A (en) * 1980-09-02 1983-03-01 Conoco Inc. Fuel slurries of solid carbonaceous material in water
US4505716A (en) * 1984-02-15 1985-03-19 Itt Corporation Combustible coal/water mixture for fuels and methods of preparing same

Also Published As

Publication number Publication date
BR8601992A (pt) 1987-01-06
AU587610B2 (en) 1989-08-24
NO861561L (no) 1986-10-24
ZA862533B (en) 1986-11-26
IT8520456A0 (it) 1985-04-23
EP0200074B1 (de) 1990-02-07
EP0200074A3 (en) 1987-11-04
GR860933B (en) 1986-07-01
DE3668908D1 (de) 1990-03-15
IT1187660B (it) 1987-12-23
JPS61247794A (ja) 1986-11-05
FI861554A0 (fi) 1986-04-14
SU1731065A3 (ru) 1992-04-30
FI861554L (fi) 1986-10-24
ES8802578A1 (es) 1987-07-01
IT8520456A1 (it) 1986-10-23
ES554668A0 (es) 1987-07-01
IN167190B (de) 1990-09-15
AU5599086A (en) 1986-10-30
FI861554A7 (fi) 1986-10-24
DD244561A5 (de) 1987-04-08
JPH068420B2 (ja) 1994-02-02

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