Betz Paperchem, Inc.

Bet Paperchem, Inc.

Cheng-I Chen

Theresa D Hancock

Michael M Blackstone

Thomas W Woodward

The present invention is directed to the use of certain ethoxylated compounds to increase the yield of green liquor semi-chemical pulping processes, the compound have the following structures: ##STR1##

Method of enhancing green liquor semi-chemical pulp production

A process for making paper and linerboard, employing certain nonionic surface active agents to increase the yield of kraft pulping. The surface active agents having the structural formula ##STR1## where n is an integer from 8 to 12, and x is a positive integer from 1 to about 100, the surface active agent being present in the cooking liquor in an amount effective to increase the yield of pulp.

Process for producing kraft pulp for paper using nonionic surface active

The present invention is directed to the use of certain ethoxylated compounds to increase the yield of chemical pulping processes, the compound have the following structures: ##STR1## These ethoxylated compounds have molecular weights of from about 500 to about 30,000 the (CH.sub.2 CH.sub.2 O) comprising from about 20 to 80 percent of the compound; and a, b, and c are each at least 1. The compounds are surface active agents which are added to the cooking liquor. The wood chips are cooked from about one-half and ten hours at a temperature of from about 200 and 500 degrees Fahrenhelt in a liquor including sodium hydroxide, sodium sulfide, and the surface active agent. The wood plug would have a reject level of at least 5% when the chips are cooked in the absence of the surface active agent. The process provides a simultaneous reduction in the level of rejects and an increased yield of pulp.

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Jacksonville, FL, United States of America

Cheng-I Chen