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

A technology of twin-screw extrusion and hydrogen peroxide, which is applied in the direction of cellulose raw material pulping, pulp bleaching, pulp beating/refining methods, etc. , Unstable slurry concentration and other problems, to improve the final pulp quality, improve the extrusion tearing effect, and ensure the effect of refining quality

Inactive Publication Date: 2005-03-02
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

However, the existing APMP pulping process cannot achieve the desired effect due to the extrusion and tearing of the fiber raw material due to the selected single-screw extruding deflaker, which leads to the impregnation of the fiber raw material in the pulping solution. The defect that the treatment cannot achieve the required effect, and at the same time, the impregnator often brings the pulping liquid into the reaction chamber, which leads to the instability of the slurry concentration in the reaction chamber and affects the quality of the subsequent refining section.

Method used

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

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Embodiment

[0046] Select poplar wood chip for use as pulping raw material, referring to Fig. 2, technological process of the present invention, by wood chip washing, steaming, hot water or hot alkali pretreatment, 1# twin-screw extruding deflaking machine, 1# reaction chamber, 2 #Double-screw extruding deflaking machine, 2# reaction chamber, one-stage high-consistency mill, two-stage high-consistency mill, submerged pool, screening and purification, thickener and slurry pool and other processes, the process will be the existing technical process in Figure 1 1# single-screw extruding deflagging machine and 1# impregnator and 2# single-screw extruding deflagging machine and 2# impregnating device are replaced by 1# twin-screw extruding deflagging machine and 2# twin-screw extruding deflagging machine of the present invention , so that the extrusion deflaking and impregnation processes in the process are combined into one, and it is completed by the twin-screw extruding deflagging machine. N...

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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 new pulping process of alkaline hydrogen peroxide mechanical pulp (APMP) by twin-screw extrusion. Background technique [0002] Alkaline peroxide mechanical pulp (APMP) is a kind of chemomechanical pulp made from hardwood as the main raw material for pulping by extrusion, flaking, impregnation and refining. Its pulping process is developed on the basis of BCTMP pulp (bleached chemical thermomechanical pulp) pulping process, and brings together CTMP pulp (chemical thermomechanical pulp) and BCTMP pulp (bleached chemical thermomechanical pulp) in Based on the advantages of pulping process and production equipment, the pulping process of "combining pulping and bleaching into one, and completing the bleaching process while pulping" has been created. This pulping process has become the largest pulping process of APMP pulp. features. It has the advantages of less inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/02D21B1/34D21C3/22D21C9/10D21D1/20
Inventor 胡惠仁
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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