The application of cooking aid and bleaching agent were discussed,at the same time,mechanism of process-ing was also reported in this paper.

Application of cooking aid,modification of digester and oxygen delignification in chemical pulping were introduced,and the basic principle of extended delignification was introduced in this paper.

This paper reviewed the classification, application properties, and working principles of various cooking aids used in pulp mills.

Alkali lignin of black liquor is improved by purification and sulfonation and this improved lignin is called congeneric lignin sulfonate which is used as cooking additive.

A novel cooking additive was designed and prepared.

The application of chelating agents as cooking aids in caustic soda-AQ pulping of wheat straw was introduced in this article.

Laboratorial experiment results of applying three Buckman cooking aids (Busperse 2282, Busperse 2262 and BLS 9011) to non-wood fiber (reed, bagasse, wheat straw and bamboo) pulping were presented in this paper.

Studies on the compounding and applications of cooking additive BT;

It has been found that the improved black liquor pre-cooking and sodium hydroxide plus auxiliary agent second-stage cookingis better than the conventional sodium hydroxide plus auxiliary agent method in the following aspects: the selectivity and speed ofcooking has been ncreased, the pulp yield and viscosity has been increased, the hardness has been lowered and thewhiteness impr.