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Method for preparing bleached chemi-mechanical pulp by using whole straw of mulberry tree branch

A technology for bleaching chemical mechanical and mulberry trees, which is applied in chemical/chemical mechanical pulp, pulping with inorganic alkali, pulp beating/refining methods, etc., can solve the problems of low utilization rate of mulberry branches and narrow product application range, and achieve reduction The amount of chemicals, good physical strength properties, the effect of reducing transition damage

Active Publication Date: 2009-12-30
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of low utilization rate of mulberry branches and narrow product application range in the prior art, and provide a method for making bleached chemical mechanical pulp by using the whole mulberry branches, which can efficiently use the whole mulberry branches to produce bleached chemical mechanical pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] After the whole mulberry branch stalk is sliced, screened and washed, soak in water for 10-12 hours, then steam with 100-105°C steam at 1 atmospheric pressure for 15 minutes, and steam the wood chips with a compression ratio of 4-6:1 (volume ratio ) twin-screw extruder carries out I section extrusion tearing, and the material after extrusion tearing carries out I section chemical pretreatment, and treatment condition is: DTPA consumption 0.3% (to absolute dry mulberry branch wood chip), sodium hydroxide consumption 2.0% (to absolute dry mulberry wood chips), the impregnating concentration is 30%, the impregnating temperature is 75° C., and the impregnating time is 30 minutes. The chemically treated material is then extruded in stage II with a twin-screw extruder with a compression ratio of 4 to 6:1 (volume ratio), and the material extruded in stage II is then subjected to stage II with alkaline hydrogen peroxide bleaching solution chemical treatment. Treatment conditio...

Embodiment 2

[0026]After slicing, screening and washing the whole mulberry branch stalks, soak in water for 10-12 hours, then steam with 100-105°C steam at normal pressure for 15 minutes, and steam the wood chips with a compression ratio of 4-6:1 (volume ratio ) twin-screw extruder carries out I stage extrusion tearing, and the material after extrusion tearing carries out I stage chemical pretreatment, and treatment condition is: DTPA consumption 0.4% (to absolute dry material quality), sodium hydroxide consumption 2.0 % (to the quality of the absolute dry material), the impregnating concentration is 30%, the impregnating temperature is 75° C., and the impregnating time is 30 minutes. The chemically treated material is then extruded by a twin-screw extruder with a compression ratio of 4 to 6:1 (volume ratio), and the extruded material is then chemically impregnated in the second stage with an alkaline hydrogen peroxide bleaching solution. . The impregnation conditions are: the amount of h...

Embodiment 3

[0028] A kind of method that utilizes the whole bar of mulberry branch to make bleached chemical mechanical pulp, the steps are:

[0029] (1) Preparation of raw materials of mulberry branches: After the whole stalks of mulberry branches are sliced, they are first screened and washed to remove impurities such as sediment, and the washed wood chips are then soaked for 4 to 10 hours to make the mulberry branches The moisture content of wood chips is uniform;

[0030] (2) Pre-steaming: pre-steaming the mulberry branch wood chips processed in step (1) under 1 atmosphere, so that the structure of the wood chips is softened. The conditions are: the temperature is 100-105°C, and the time is 30 minutes;

[0031] (3) Stage I screw extrusion: use a twin-screw extruder with a compression ratio of 4 to 6:1 (volume ratio) to extrude the material processed in step (2), so that the wood chip structure is torn by extrusion Deformation, promote the absorption of liquid medicine in the subsequ...

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Abstract

The invention discloses a method for preparing bleached chemi-mechanical pulp by using a whole straw of a mulberry tree branch, which comprises presteaming, two sections of screw extrusion, two sections of chemical impregnation, high-consistency double-screw pulp refining, high-consistency residence, middle-consistency pulp refining and other working sections. The method is based on the raw material characteristics of the whole straw of the mulberry tree branch, gradually removes most of non-fiber components in the mulberry tree branch unfavorable for pulp refining, maintains fiber components as much as possible and reduces unfavorable factors to subsequent pulp refining and bleaching caused by the non-fiber components; chlorine containing bleaching agents are not used in the pulp refining process, so that the environment is protected; in addition, the obtained paper pulp has high yield, good physical strength and excellent optical property, and the cleaning and high-efficiency pulp refining of the whole straw of the mulberry tree branch is achieved. The method has the characteristics of simple process flow, less investment, environment-friendly pulp refining process and the like, and has better economic benefit and social benefit and wide popularization value.

Description

technical field [0001] The invention belongs to the technical field of chemical-mechanical pulping, and in particular relates to a process for preparing bleached chemical-mechanical pulp by using whole mulberry branches. Background technique [0002] my country is a big producer and consumer of paper and cardboard, ranking second in the world in terms of production and consumption of paper and cardboard. However, my country is a country that is seriously deficient in lignocellulosic resources. For a long time, due to the shortage of wood pulp, the quality of paper, cardboard and paper products in my country has been low, and structural contradictions have been prominent. Products have to rely heavily on imports, and a large amount of commercial wood pulp must be imported from abroad every year. Since 2002, my country's wood pulp imports have been ranking first in the world. With the strengthening of the global protection of the ecological environment, the cost of importing ...

Claims

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Application Information

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IPC IPC(8): D21H11/02D21B1/04D21C1/02D21C1/10D21C3/02D21C9/16D21H17/66D21D1/34D21H17/14
Inventor 邓拥军房桂干韩善明焦健李红斌李萍
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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