Process for producing pulp

摘要

A novel process for producing pulp is disclosed, by which cooking of lignocellulosic materials can be carried out advantageously in the presence of a novel cooking aid added to the cooking liquor. Representative examples of such cooking aids include maleic acid, sodium maleate, potassium maleate, maleic anhydride, fumaric acid, sodium fumarate, potassium fumarate, mesaconic acid and sodium mesaconate. Both cooking yield and quality of pulp are substantially improved. The cooking aids can be used in combination with dihydroxydihydroanthracene.