New process for producing alkaline hydrogen peroxide mechanical pulp by double scrwe extruding method

Abstract

The present invention is improved double screw extruding pulp producing process of alkali hydrogen peroxide mechanical pulp (APMP). The technological process includes water washing spill, steam digestion, hot water or hot alkali pre-treatment, treating in the first screw extruding breaker beater, reaction in the first reaction compartment, treating in the second screw extruding breaker beater, reaction in the second reaction compartment, milling in the first high concentration mill, milling in the second high concentration mill, sieving and purification, concentration, pulping pond treatment and other steps. Compared with traditional APMP, the present invention has similar quality and the advantages of simplified technological process, saving in investment and power consumption, less water consumption and lower waste water treating load. The present invention is suitable for producing APMP with different timber material, bagasse, etc.

Description

technical field [0001] The invention relates to a pulping process of chemical mechanical pulp, in particular to a pulping process of alkaline hydrogen peroxide mechanical pulp by twin-screw extrusion. Background technique [0002] Alkaline hydrogen peroxide mechanical pulp is a kind of chemical mechanical pulp made from hardwood as the main pulping raw material by extrusion, flaking, impregnation and refining. Its pulping process is developed on the basis of the pulping process of bleached chemical thermomechanical pulp. It combines the advantages of the pulping process and production equipment of chemical thermomechanical pulp and bleached chemical thermomechanical pulp. The pulping process of "combining pulping and bleaching into one, and completing the bleaching process while pulping" has become the biggest feature of the alkaline hydrogen peroxide mechanical pulping process. It has the advantages of less investment in equipment, small footprint, compact process flow, lo...

AI Technical Summary

Problems solved by technology

However, the existing alkaline hydrogen peroxide mechanical pulping process has the defect that the selected single-screw extruding deflaker cannot achieve the required effect, and the impregnator often brings the pulping and bleaching liquid into the reaction warehouse, but there is a disadvantage that the slurry concentration in the reaction chamber is unstable and affects the quality of the subsequent refining section.

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