Method of inhibiting crosslinking of aqueous xanthan gums in the

Details Method of inhibiting crosslinking of aqueous xanthan gums in the Method of inhibiting crosslinking of aqueous xanthan gums in the

1980-03-18

1982-03-02

Guynn, Herbert B.

Compositions

Leather or fur treating

166307, E21B 4327

Patent

active

043177352

ABSTRACT:
Aqueous xanthan gums normally crosslink at a pH greater than about 1.5 in the presence of ferric ions. This phenomenon is undesirable under many conditions of use, such as acidizing treatments of wells, and is inhibited or prevented by adding certain soluble alkanoic and/or alkenoic acids to the system. The alkanoic and alkenoic acids have at least 4 carbon atoms and bear at least 2 alcoholic hydroxyl groups per molecule and can be added as the organic acid per se or as a soluble salt or .gamma.-lactone. Ascorbic acid and erythorbic acid are examples.

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Davidson, Handbook of Water Soluble Gums and Resins, pub. 1980 by McGraw-Hill Book Co., pp. 24-2 to 24-31.
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