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Pigment decomposition and pigment extraction production technology of whole cotton stalk chemi-mechanical pulp

A production process and technology of cotton straw, applied in the multi-stage pulping process, pulping with inorganic alkali, pulp bleaching and other directions, can solve the problems of hindering the bleaching process, affecting the penetration of bleaching pharmaceutical industry, poor bleachability of cotton straw, etc. Simple process flow, low production cost, and the effect of overcoming high dustiness

Active Publication Date: 2015-08-19
白博
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The problems existing in the traditional mechanical pulping process are: on the one hand, the insufficient decomposition of the pigment in the cotton straw raw material hinders the bleaching process; In the middle, it will affect the penetration of the subsequent bleaching pharmaceutical industry, resulting in poor bleachability of the cotton straw and the problem of high dustiness cannot be overcome

Method used

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  • Pigment decomposition and pigment extraction production technology of whole cotton stalk chemi-mechanical pulp
  • Pigment decomposition and pigment extraction production technology of whole cotton stalk chemi-mechanical pulp
  • Pigment decomposition and pigment extraction production technology of whole cotton stalk chemi-mechanical pulp

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Effect test

Embodiment 1

[0044] Raw materials: cotton stalks, the whole stalks are crushed to 2-10mm, air-dried, water content 14%, place of origin: Liaocheng, Shandong

[0045] Raw material weight: 1200kg is absolutely dry, and the addition amount of medicine in the present invention is all the percentage by weight of medicine and raw material consumption.

[0046] Facilities: 10,000 tons / year non-wood fiber bleached mechanical pulp pilot line

Embodiment approach

[0048] The implementation steps are:

[0049] 1. The technological process adopted is: raw material washing (a4)—raw material cooking (b4)—extrusion washing, pulp washing, silk rubbing and dosing (cdef4)—dipping (g4)—extrusion washing, pulp washing, silk rubbing and dosing ( i4)——dipping (j4)——washing (k4)——high consistency refining (l4)——dosing (m4)——soaking (n4)——washing (o4)

[0050] 2. Raw material washing (a4): carried out on a 10,000-ton / year drum washing machine, with a cotton stalk concentration of 5%. The moisture content of raw materials before washing is 14%, and the moisture content of raw materials after washing is 60%, so it is necessary to supplement washing water in the raw material washing process without sewage discharge.

[0051] 3. Cooking of raw materials (b4): After washing and dehydrating the raw materials, they are cooked in a 10,000-ton / year continuous digester. Cooking conditions: temperature 95°C, cooking 60min, NaOH 2%, DTPA 0.2%. Preliminary pig...

Embodiment 2

[0068] The following high-brightness cotton straw bleaching mechanical pulping process is adopted: the following high-brightness cotton straw bleaching mechanical pulping process is adopted: raw material washing (a2)——raw material cooking (b2)——extruding pulp washing and silk rolling Dosing (cdef2) - impregnation (g2) - pulping and washing (h2) subsequent process - beating and papermaking. Other conditions are with embodiment 1.

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Abstract

The invention discloses a pigment decomposition and pigment extraction production technology of whole cotton stalk chemi-mechanical pulp. Aiming at the problems that whole cotton stalk bleached chemi-mechanical pulp is low in brightness and high in speckiness, conventional chemi-mechanical pulp processes and technology are redesigned. During the process of pulping and bleaching of the chemi-mechanical pulp, a pigment decomposition technological link and a pigment extraction technological link are respectively arranged for raw materials and coarse pulp, and a new technological process is designed according to the actual production condition, so that the troubled problem of cotton stalk pigment is thoroughly solved, and the pulp brightness reaches above 80% ISO, and the problem of the speckiness is thoroughly solved. The pigment decomposition and pigment extraction production technology of the whole cotton stalk chemi-mechanical pulp is also suitable for using wood and other non-wood fiber raw materials to produce high-brightness chemi-mechanical pulp.

Description

technical field [0001] The invention relates to the field of pulping and papermaking, in particular to a production process for pigment decomposition and pigment extraction of pure cotton straw chemical pulp. technical background [0002] Cotton straw is a high-quality papermaking raw material. The special fiber structure and special chemical composition of cotton straw raw materials determine the special pulping characteristics of bleached mechanical pulp from cotton straw. The fiber composition of cotton stalks is between coniferous wood and broad-leaved wood, which makes cotton stalk chemical pulp raw materials have special pulp strength and uniqueness; at the same time, the pigmentation of cotton stalk skin and the presence of pectin and other extracts affect The bleachability of cotton stalks makes the production of high-brightness bleached mechanical pulp from cotton stalks subject to technical constraints, and it has not been possible to use cotton stalks for large-sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C9/02D21C9/16D21H11/12
CPCD21B1/12D21C3/26D21C9/02D21C9/10D21C9/18D21C3/02D21C9/163D21H11/12
Inventor 白博王勇刘玉芳白嘉妮史晓菲白伟才安骏薛希贤
Owner 白博