Papermaking technology

• Main Authors: LIN SHUTANG, LIN SHUQIN, LIN LICHANG
• Format: Patent
• Language: Chinese; English
• Published: 01.01.2019
• Subjects: APPARATUS THEREFOR; PAPER-MAKING; PRODUCTION OF CELLULOSE; PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; TEXTILES

The invention relates to a papermaking technology. The papermaking technology comprises the following steps: (1) before alkaline pulping, pretreating a papermaking raw material in water with the pH (potential of hydrogen) value of 4.5 to 5 and temperature of 45 to 50 DEG C by xylanase and cellulase; (2) adding a sulfonating agent into papermaking black liquid obtained after alkaline pulping and pulp-washing bleaching, and performing sulfonating modifying on lignin in the papermaking back liquid; (3) sending the black liquid subjected to lignin sulfonating modifying into the pretreatment phasein step (1) to recycle. The papermaking technology has the advantages that one part of lignin in the papermaking black liquid subjected to sulfonating modifying is converted into alkyl sulfonate, andthe glue applying degree of the paper is improved by the converted alkyl sulfonate after the black liquid is recycled; because the treated black liquid is recycled, the usage amounts of water and alkaline in the whole technolo