PRODUCTION OF CELLULOSE BY THE SODA-ANTHRAQUINONE PROCESS (SAP) WITH RECOVERY OF THE BOILING CHEMICALS

摘要

for the production of cellulose from wood and annual plants is a process of boiling in the boiling liquor contains a lye and sodium salts of appropriate alkylbenzu00e8nesulfoniques acids or carboxylic acids aromatic and aliphatic.by addition of anthraquinone or derivatives of this substance in the solution is boiled, the delignification. it is not necessary to limit the amount of hydroquinone is added, due to the price of the material, the fact that the anthraquinone resists wet oxidation and can be used in the process of boiling.the solubility and, therefore, the action of the anthraquinone is increased through the use of salts of the sulfonic acid.to get the chemicals present in the black liquor to boil, it is proposed that the lignin precipitate in the solution with a mineral acid or a carboxylic acid, as the case may be.separation of hemicelluloses by ultrafiltration and resin extraction and burning the remaining organic compounds and other salts of the sulfonic acid and salts of the carboxylic acid by oxidation in the aqueous phase with air or oxygen.the solution of chemicals released by the decomposition products of the wood can be reintroduced into the caustic liquor, carbonates, and disposal after partial crystallization of the aliphatic carboxylic acid salts, in the circuit of the pr production of cellulose.sodium acetate isolated by crystallization can be divided into acetic acid and sodium hydroxide by electrolysis using a diaphragm. the lye is reintroduced in the cooking process, the acetic acid is treated separately.