Standard Oil Company (indiana)

The Standard Oil Company

Edward F McCarthy

William P Weisrock

Kwei C Chao

George A McConaghy

A new degenerative-resistant strain of Xanthomonas campestris is described which is suitable for long-term continuous fermentation to produce xanthan gum from a nutrient medium, typically containing inorganic salts, glucose, NH.sub.4 Cl, and citric acid, with or without yeast extract or yeast autolysate.

Xanthomonas campestris ATCC 31601 and process for use

A new degenerative-resistant strain of Xanthomonas campestris is described which is suitable for longterm continuous fermentation to produce xanthan gum from a nutrient medium, typically containing inorganic salts, glucose, NH.sub.4 Cl, and citric acid, with or without yeast extract or yeast autolysate.

Xanthomonas campestris ATCC 31600 and process for use

Xanthomonas campestris ATCC 31602 and process for use

Yeast autolysis is enhanced by the addition of certain exogenous enzymes to the yeast slurry at concentrations of from about 0.01-1.0 weight percent, said enzymes being selected from the group consisting of papain, ficin, bromelain, pancreatin, and aspergillus protease.

Yeast autolysis process

A method for increasing the tolerance of hydrocarbon polymer sulfonate surfactant materials to divalent ions especially calcium when such materials are injected into subterranean formations containing high divalent cation contents which comprises contacting the hydrocarbon polymer sulfonate surfactant with an oxidizing agent at oxidizing conditions. The specific hydrocarbon polymer sulfonate surfactants disclosed are those produced from lower aliphatic olefins such as isobutylene, butene-1, butene-2 or propylene or other similar olefinic materials which have been polymerized to average equivalent molecular weights of from about 350 to 675 or higher. The preferred oxidizing agent is hydrogen peroxide.

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Naperville, IL, United States of America

Edward F McCarthy