EP1220821A1 - Inhibition de la corrosion et d'hydrates de gaz lors du transport d'eau et d'hydrocarbures dans un pipeline - Google Patents

Inhibition de la corrosion et d'hydrates de gaz lors du transport d'eau et d'hydrocarbures dans un pipeline

Info

Publication number
EP1220821A1
EP1220821A1 EP00947263A EP00947263A EP1220821A1 EP 1220821 A1 EP1220821 A1 EP 1220821A1 EP 00947263 A EP00947263 A EP 00947263A EP 00947263 A EP00947263 A EP 00947263A EP 1220821 A1 EP1220821 A1 EP 1220821A1
Authority
EP
European Patent Office
Prior art keywords
water
composition according
corrosion
vinyl
hydrocarbon
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.)
Withdrawn
Application number
EP00947263A
Other languages
German (de)
English (en)
Other versions
EP1220821A4 (fr
Inventor
Kirill N. Bakeev
Jui-Chang Chuang
Thomas Winkler
Michael A. Drzewinski
David E. Graham
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.)
ISP Investments LLC
Original Assignee
ISP Investments LLC
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
Priority claimed from US09/415,657 external-priority patent/US6281274B1/en
Application filed by ISP Investments LLC filed Critical ISP Investments LLC
Publication of EP1220821A1 publication Critical patent/EP1220821A1/fr
Publication of EP1220821A4 publication Critical patent/EP1220821A4/fr
Withdrawn legal-status Critical Current

Links

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
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04

Definitions

  • This invention relates to a process of corrosion inhibition of a steel pipeline during transport of water and gas, or water and oil, or mixtures thereof, therethrough. Furthermore it relates to a composition for preventing or retarding the formation of gas hydrates during the transport of a fluid comprising water and a hydrocarbon through a conduit.
  • U.S. Pat. 4,174,370 described the use of certain pyridine compounds for inhibiting the corrosion of metals, particularly the prevention of corrosion of pipe which is on contact with a corrosive oil-containing medium, as, for example, in oil wells producing corrosive oil or oil-brine mixtures.
  • Insulation of the pipelines may decrease the opportunity for gas hydrate formation; however, if the field is relatively small and some distance from the production facilities, the cost of providing suitable insulation is too high to make such a field economically attractive. It is also known to add anti-freeze compounds, for example, ethylene giycol or methanol, during transport of such liquids and gases to minimize gas hydrate formation; however, large quantities of these highly flammable compounds are required to be effective which is expensive and unsafe.
  • anti-freeze compounds for example, ethylene giycol or methanol
  • the composition comprises a copolymer of (a) vinyl caprolactam and (b) vinyl pyridine; optionally, a terpolymer with vinyl pyrrolidone, preferably wherein the vinyl pyridine is the 2- or 4-vinyl pyridine, optionally quaternized, e.g. with a C C-is alkyl halide, e.g. the iodide, bromide, chloride or fluoride; having a cloud point of >10°C, preferably >15°C.
  • the composition is made in a polymerization solvent which is a giycol ether, containing an alkoxy group having at least 3 carbon atoms, and most preferably, which is 2-butoxyethanol (BGE); and includes also a carrier solvent different from the polymerization solvent, preferably, monoethylene giycol (MEG).
  • a polymerization solvent which is a giycol ether, containing an alkoxy group having at least 3 carbon atoms, and most preferably, which is 2-butoxyethanol (BGE); and includes also a carrier solvent different from the polymerization solvent, preferably, monoethylene giycol (MEG).
  • the vinyl caprolactam monomer comprises about 70-97% of the polymer, and has a molecular weight of about 500 to 2500.
  • This function of this invention relates to the use of the copolymer in inhibiting the corrosion of metals, most particularly iron, steel and ferrous alloys.
  • These copolymer compounds can be used in a wide variety of applications and systems where iron, steel and ferrous alloys are affected by corrosion. They may be employed for inhibiting corrosion in processes which require a protective or passivating coating as by dissolution in the medium which comes in contact with the metal. They can be used in preventing atmospheric corrosion, underwater corrosion, corrosion in steam and hot water systems, corrosion in chemical industries, underground corrosion, etc.
  • the polymer which exhibits advantageous dual corrosion and gas hydrate inhibitory characteristics in the composition of the invention is a copolymer of about 70-97% by weight of vinyl caprolactam and 3-25% by weight of vinyl pyridine, preferably the 2- and 4-vinyl pyridine compounds, and, optionally, terpolymers with up to 15% by weight of vinyl pyrrolidone therein.
  • the vinyl caprolactam monomer comprises about 75-95% of the polymer and the vinyl pyridine monomer is present in an amount of about 5-15%; optionally, vinyl pyrrolidone is included therein in an amount of up to 10%.
  • the polymers of the invention also may be quaternized, suitably with about a C- ⁇ -C 18 alkyl halide; e.g. an alkyl iodide.
  • the polymer has a molecular weight of about 500 to 2500.
  • composition herein is a single phase system having a cloud point of >10°C, preferably >15°C.
  • the polymer is synthesized from its monomers in a polymerization solvent which preferably is a giycol ether containing an alkoxy group having at least 3 carbon atoms.
  • a polymerization solvent which preferably is a giycol ether containing an alkoxy group having at least 3 carbon atoms.
  • suitable giycol ethers are 2-butoxyethanol (ethylene giycol monobutyl ether); propylene giycol butyl ether; (diethylene giycol) monobutyl ether; and 2-isopropoxy- ethanol.
  • 2-Butoxyethanol (BGE) is most preferred.
  • the product of the polymerization is a composition of the polymer in its polymerization solvent, e.g. BGE.
  • the weight ratio of the polymerization solvent to the polymer is about 1 :1.5 to 3:3 to 1 , preferably about 1.5:1.
  • composition is then provided with a suitable carrier solvent such as monoethylene giycol (MEG), methanol, ethanol, propanol, 1 ,4-butanediol, butanol, pentanol, hexanol, cyclohexyl pyrrolidone, propargyl alcohol, N-methylpyrrolidone and the like, preferably MEG.
  • a suitable carrier solvent such as monoethylene giycol (MEG), methanol, ethanol, propanol, 1 ,4-butanediol, butanol, pentanol, hexanol, cyclohexyl pyrrolidone, propargyl alcohol, N-methylpyrrolidone and the like, preferably MEG.
  • MEG monoethylene giycol
  • concentration of MEG in the aqueous phase i.e. under pipeline inhibition conditions, is about 2.5-10 wt. %, preferably 4-5 w
  • the thus-formed solution with carrier solvent can be further diluted with a dilution liquid, preferably water or methanol, or mixtures thereof, if desired, to form a use composition for injection into the pipeline.
  • a dilution liquid preferably water or methanol, or mixtures thereof, if desired, to form a use composition for injection into the pipeline.
  • the inhibitor composition-to-dilution liquid ratio is about 0.5:1 to 5:1.
  • the polymer solution used in the composition of the invention is present in an amount of about 30 to 70%, preferably 45 to 55%, by weight in admixture with the polymerization solvent.
  • the polymer inhibition concentration in the pipeline, i.e. in the aqueous phase (water being inherently present therein) is about 0.1 to 3%, preferably 0.5-1%, by weight.
  • the solvent* inhibition concentration accordingly, is about 1 to 9% by weight of the aqueous phase.
  • Example 1 illustrates the preparation of a 40 weight % solution of a copolymer of 97% by weight vinyl caprolactam and 3% by weight of 4-vinyl pyridine in 2-butoxy-ethanol (BGE).
  • the polymer has a relative viscosity of 1.061 (1 % in BGE, GPC weight-average molecular weight of 1 ,060, polyethylene giycol as standard).
  • Example 2 is representative of the effectiveness of the copolymer of the invention in corrosion inhibition of metals in natural gas pipelines.
  • the copolymer of Example 1 is diluted with monoethylene giycol and is used in gas hydrate inhibition in natural gas wells, whereupon dual functionality of gas hydrate inhibition and corrosion inhibition is demonstrated by its effectiveness in preventing corrosion in the pipeline.
  • Example 3 illustrates the effectiveness of the compositions of the invention to inhibit gas hydrate formation in a hydrocarbon fluid.
  • brackets indicate a given rig number

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)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Lubricants (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

L'invention concerne un procédé d'inhibition de la corrosion d'un pipeline d'acier et de la formation d'hydrates de gaz dans celui-ci, lors du transport, à travers ce pipeline, d'eau et de gaz, ou d'eau et d'une huile, ou de mélanges de ces substances, ce procédé consistant à introduire un copolymère de caprolactame de vinyle et de vinylpyridine dans ce pipeline.
EP00947263A 1999-10-12 2000-07-13 Inhibition de la corrosion et d'hydrates de gaz lors du transport d'eau et d'hydrocarbures dans un pipeline Withdrawn EP1220821A4 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US415657 1982-09-07
US09/415,657 US6281274B1 (en) 1999-10-12 1999-10-12 Method for preventing or retarding the formation of gas hydrates
US416307 1999-10-12
US09/416,307 US6432355B1 (en) 1999-10-12 1999-10-12 Corrosion inhibition during transport of water and a hydrocarbon through a pipeline
PCT/US2000/018987 WO2001027055A1 (fr) 1999-10-12 2000-07-13 Inhibition de la corrosion et d'hydrates de gaz lors du transport d'eau et d'hydrocarbures dans un pipeline

Publications (2)

Publication Number Publication Date
EP1220821A1 true EP1220821A1 (fr) 2002-07-10
EP1220821A4 EP1220821A4 (fr) 2004-08-25

Family

ID=27023055

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00947263A Withdrawn EP1220821A4 (fr) 1999-10-12 2000-07-13 Inhibition de la corrosion et d'hydrates de gaz lors du transport d'eau et d'hydrocarbures dans un pipeline

Country Status (5)

Country Link
EP (1) EP1220821A4 (fr)
AU (1) AU6090300A (fr)
CA (1) CA2387420C (fr)
NO (1) NO20021712L (fr)
WO (1) WO2001027055A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2502655A1 (fr) 2011-03-25 2012-09-26 Sulzer Chemtech AG Procédé de distillation réactive et installation pour obtenir de l'acide acétique et de l'alcool à partir de l'hydrolyse d'acétate de méthyle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6451892B1 (en) * 1999-07-13 2002-09-17 Isp Investments Inc. Method for preventing or retarding the formation of gas hydrates
CN102690391B (zh) * 2012-06-06 2014-02-12 甘肃省化工研究院 水合物抑制剂乙烯基己内酰胺和乙烯基咪唑共聚物的合成方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006749A (en) * 1975-01-31 1977-02-08 Consolidated Cigar Corporation Removal of harmful components from tobacco smoke
SU1015018A1 (ru) * 1980-12-15 1983-04-30 Всесоюзный научно-исследовательский институт синтетических волокон Способ получени антимикробного текстильного материала
JPS5849715A (ja) * 1981-08-13 1983-03-24 ジ−・エ−・エフ・コ−ポレ−シヨン ビニルカプロラクタム／ビニルピロリドン／アクリル酸アルキルを含有する毛髪調合剤
US5841010A (en) * 1994-09-15 1998-11-24 Exxon Production Research Company Surface active agents as gas hydrate inhibitors
AU5779896A (en) * 1995-05-26 1996-12-11 Nippon Shokubai Co., Ltd. Clathrate hydrate inhibitor and method of inhibiting the for mation of clathrate hydrates using it
US5567786A (en) * 1996-02-06 1996-10-22 Isp Investments Inc. Polymerizable composition of vinylpyrrolidone and vinyl caprolactam
US5723524A (en) * 1996-11-06 1998-03-03 Isp Investments Inc. Method for preventing or retarding the formation of gas hydrates
US6117929A (en) * 1998-12-03 2000-09-12 Isp Investments Inc. Method for preventing or retarding the formation of gas hydrates
US6242518B1 (en) * 2000-04-21 2001-06-05 Isp Investments Inc. Method for preventing or retarding the formulation of gas hydrates

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2502655A1 (fr) 2011-03-25 2012-09-26 Sulzer Chemtech AG Procédé de distillation réactive et installation pour obtenir de l'acide acétique et de l'alcool à partir de l'hydrolyse d'acétate de méthyle

Also Published As

Publication number Publication date
NO20021712L (no) 2002-06-05
CA2387420C (fr) 2009-09-29
CA2387420A1 (fr) 2001-04-19
AU6090300A (en) 2001-04-23
NO20021712D0 (no) 2002-04-11
EP1220821A4 (fr) 2004-08-25
WO2001027055A1 (fr) 2001-04-19

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