Lignotech Usa, Inc.

Halliburton Energy Services, Inc.

Stephen L Dickman

Stuart E Lebo

Jiten Chatterji

D Chad Brenneis

Dennis Willie Gray

Kevin R Wirtz

This invention provides improved cement composition and biodegradable dispersants therefor. The biodegradable dispersants are basically comprised of a high molecular weight, phenolic hydroxy group blocked, alkali metal lignosulfonate.

Cement compositions and biodegradable dispersants therefor

A method is disclosed for the production of oxidized humic acids. The process of the invention comprises reacting humic acid bearing ores with oxygen under alkaline conditions at a temperature between 100.degree. C. and 200.degree. C. for at least 1/2 hour, but usually for 1-2 hours, to produce oxidized humic acids which are soluble at pH as low as 2.9 and which are formed in yields of at least 70%. The oxidized humic acids produced according to the process of the invention are also superior viscosity reducers.

Production of oxidized humic acids by an oxygen-alkali process

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Wausau, WI, United States of America

Stephen L Dickman