Chevron Research Company

Chevron Research

Shigeto Suzuki

Albert H Schroeder

Victor P Kurkov

Peter Denisevich, Jr

Robert G Wall

John B Wilkes

Ta Yen Ching

Kiyoshi Katsumoto

A corrosion inhibiting polyalkylenepolyamine composition comprising a mixture of

Polyalkylenepolyamines as corrosion inhibitors

Oil recovery from a petroleum reservoir using a miscible gas, such as carbon dioxide, nitrogen or methane is enhanced by injecting a preformed stable foam into the reservoir. The foam composition is formed by an effective amount of an alpha olefin sulfonate (AOS) capable of forming a foam with water having a salt content similar to that in the reservoir and the miscible gas. Preferably, the alpha olefin sulfonates have from 8 to 24 carbon atoms. In a preferred form the AOS has on average a carbon content of less than about 12 carbon atoms in higher salt content brines and less than about 12 carbon atoms in lower salt content brines. Most preferably, in brines having a salt concentration of at least 10 weight percent, the AOS has on average about 10 carbon atoms; in brines having a salt concentration of from 2 to 10 weight percent the AOS has on average about 12 carbon atoms; and in brines having less than 2 weight percent salt and AOS has on average about 14 carbon atoms.

Miscible gas enhanced oil recovery method using oil-brine compatible

Tractable doped electroactive polymers, comprising recurring units of a 3,3'-N,N'-disubstituted-6,6'-bicarbazole-1,3,4-oxadiazole-2,5-diyl ring system, and a sufficient concentration of a charge-compensating ionic dopant associated therewith.

Bicarbazole-oxadiazole electroactive polymers

Tractable doped electroactive polymers, comprising recurring units of a 3,6-N-substituted carbazole-1,3,4-oxadiazole-2,5-diyl ring system, and a sufficient concentration of a charge-compensating ionic dopant associated therewith.

Carbazole-oxadiazole electroactive polymers

Tractable doped electroactive polymers, comprising recurring units of a N-substituted 1,3,4-triazole ring system, and a sufficient concentration of a charge-compensating ionic dopant associated therewith.

Triazole electroactive polymers

Tractable doped electroactive polymers, comprising recurring units of a 1,3-heteroazole, wherein the heteroatom is oxygen, sulfur or substituted nitrogen, and a sufficient concentration of a charge-compensating ionic dopant associated therewith.

Heteroazole electroactive polymers

Tractable doped electroactive polymers, comprising recurring units of a 1,3,4-heterodiazole, wherein the heteroatom is oxygen or sulfur, and a sufficient concentration of a charge-compensating ionic dopant associated therewith.

Heterodiazole electroactive polymers

A process for the preparation of 2,6-dialkylaniline which comprises the reaction of a 1-nitroalkene with a 1,3-alkadiene to form a dialkyl nitrocyclohexene adduct and subsequent reaction of the resulting adduct with hydrogen in the presence of a hydrogenation catalyst to form the corresponding dialkylcyclohexyl amine, followed by dehydrogenation with aqueous ammonia in the presence of a dehydrogenation catalyst.

Process for the preparation of 2,6-dialkylaniline from 1-nitroalkene

Tractable doped electroactive polymers, comprising recurring units of a 1,4-dithiene ring system, and a sufficient concentration of a charge-compensating ionic dopant associated therewith.

Dithiene electroactive polymers

A process for the preparation of 1-nitroalkene which comprises the reaction of a 1-alkene with dinitrogen tetroxide in the presence of oxygen and an ether solvent to form an alkene-dinitrogen tetroxide adduct and subsequent reaction of the resulting adduct with sodium fluoride in the presence of an inert gas.

Process for the preparation of 1-nitroalkene

A process for the preparation of 2,6-dialkylaniline which comprises the reaction of 1,3-dialkyl-5-tertiary-butylbenzene with molecular bromine to form 2-bromo-1,3-dialkyl-5-tertiary-butylbenzene, which is subsequently reacted with 1,3-dialkylbenzene in the presence of hydrogen fluoride to form a mixture of 2-bromo-1,3-dialkylbenzene and 1,3-dialkyl-5-tertiary-butylbenzene, which is then reacted with ammonia in the presence of a catalytic amount of cuprous halide.

Process for the preparation of 2,6-dialkylaniline from brominated

Alkyl alkoxyacetates from C.sub.3 -C.sub.6 secondary alcohols, formaldehyde and carbon monoxide at a temperature of 5.degree. C. to -20.degree. C. and a carbon monoxide pressure of 0.5 to 275 atm.

Preparation of alkyl alkoxyacetates

In the reaction of 3-methyl-3-buten-1-ol with aqueous formaldehyde forming isomeric alkene-1,5-diols, particularly 3-methylene-1,5-pentanediol and 3-methyl-2-pentene-1,5-diol, it has been found that yields of the diols surprisingly are substantially increased if the reaction is effected in the presence of added isobutene and the mol ratio of 3-methyl-3-buten-1-ol to formaldehyde is at least 1:1.

Process for the production of alkene-1,5-diols

3-Oxacaprolactam is prepared by a process which comprises: contacting an organic acid anhydride solution of a cyanoalkoxyalkanoate with hydrogen in the presence of a noble metal hydrogenation catalyst to prepare an amide-ester; and heating the amide-ester in excess water at a temperature above about 200.degree. C.

Preparation of 6-amino-3-oxahexanoic acid compounds

A process for preparing glycolic acid which comprises contacting formaldehyde with formic acid in the presence of hydrogen fluoride present in an amount to serve as both catalyst and solvent for the reactants and reaction mixture.

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San Francisco, CA, United States of America

Shigeto Suzuki