Preparation Technology of Castor Bean Bleached Chemi-Mechanical Pulp

Abstract

The invention discloses a preparation process of ricinus communis stem chemimechanical pulp. The preparation process includes the steps that ricinus communis stems are cut into material segments which range from 35 mm to 50 mm in length, and after impurity removal and dehydration, the material segments are steamed at normal pressure and at the temperature ranging from 90 DEG C to 95 DEG C for 30 min to 50 min; the material segments are fed into a first-section thread rolling machine, the material segments stand still for the reaction for 30 min to 50 min after thread rolling, and 2% to 3% of NaOH, 0.05% to 0.1% of anthraquinone, 0.2% to 0.4% of EDTA and 2% to 4% of H2O2 are added to the first-section thread rolling machine according to the oven dry material weight; the materials are fed into a second-section thread rolling machine, stand still for the reaction for 30 min to 50 min after thread rolling, and 3% to 4% of NaOH, 4% to 6% of H2O2, 0.4% to 0.6% of polyacrylamide and 1% to 2% of MgSO4 are added to the second-section thread rolling machine according to the oven dry material weight; finally, after high consistency refining and elimination, the ricinus communis stem chemimechanical pulp is obtained. Compared with an existing process, the method is higher in pulp obtaining rate and smaller in pollution load.

Description

technical field [0001] The invention belongs to the field of papermaking, and in particular relates to a preparation process of castor stalk bleached chemical mechanical pulp. Background technique [0002] my country is one of the main countries in the world that plant castor beans to produce castor beans. Castor stalks have long fibers, toughness, and high cellulose content. They are a high-quality non-wood fiber papermaking raw material. Traditional castor stalks are used for pulping The process is mainly alkaline pulping, but castor stalks contain more lignin, and the pollution load is heavy, and the yield of castor stalk pulp is not high by traditional methods, generally only about 40%. Contents of the invention [0003] The purpose of the invention is to overcome the problems existing in the existing castor stalk pulping, and provide a preparation process of castor stalk bleached chemical mechanical pulp. [0004] The technical scheme adopted by the present invention ...

AI Technical Summary

Problems solved by technology

[0002] my country is one of the main countries in the world that plant castor beans and produce castor beans. Castor stalks have long fibers, toughness, and high cellulose content. They are a high-quality non-wood fiber papermaking raw material. Traditional castor stalks are used for pulping The process is mainly alkaline pulping, but castor stalks contain more lignin, and the pollution load is heavy, and the yield of castor stalk pulp is not high by traditional methods, generally only about 40%