Preparation method of broadleaf wood dissolving pulp

A technology for dissolving pulp and hardwood, applied in the direction of pulp bleaching, pulping with inorganic alkali, multi-stage pulping process, etc., to achieve the effect of less environmental pollution, simple process flow and mild reaction conditions

Pending Publication Date: 2021-08-24
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, many biorefinery technologies that use small-sized wood chips as raw materials cannot be directly applied to large-sized raw mate...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Screen 2g of wood chips with a size not greater than 50×40×8mm (length×width×thickness). The screened wood chips are steamed at 95°C for 20 minutes, and then squeezed with a compression ratio of 4:1. Use 45ml of 75wt% p-toluenesulfonic acid, 8ml of sodium hypochlorite, and 0.3ml of sodium chlorite to pretreat wood chips for 60 minutes at 90°C to obtain a coarse pulp that is filtered to neutral and then stirred at a stirring speed of 300rpm / min. After ultrasonic treatment for 7 s, the obtained slurry was filtered to neutral. Coarse pulp has undergone staged oxygen delignification without washing, the dosage of sodium hydroxide (based on dry pulp) in the first stage is 2.5%, the dosage of magnesium sulfate (based on dry pulp) is 2.5%, and the oxygen pressure is 5.5 at 105°C Bar heat preservation for 25 minutes; the dosage of sodium hydroxide (based on dry pulp) in the second stage of oxygen bleaching is 2.5%, the dosage of magnesium sulfate (based on dry pulp) is 2.5%, an...

Embodiment 2

[0031] Screen 3g of wood chips with a size not greater than 50×40×8mm (length×width×thickness). The screened wood chips are steamed at 105°C for 30 minutes, and then squeezed with a compression ratio of 4:1. Use 55ml of 80wt% p-toluenesulfonic acid, 15ml of sodium hypochlorite, and 0.7ml of sodium chlorite to pretreat the wood chips for 90 minutes at 105°C to obtain a coarse pulp that is filtered to neutral and then mixed at a stirring speed of 100rpm / min. After ultrasonic treatment for 5 s, the obtained slurry was filtered to neutral. Coarse pulp has undergone staged oxygen delignification without washing, the dosage of sodium hydroxide (based on absolute dry pulp) in the first stage is 3.5%, the dosage of magnesium sulfate (based on absolute dry pulp) is 3.5%, and the oxygen pressure is 6.5 at 125°C. Bar heat preservation for 35 minutes; the dosage of sodium hydroxide (based on dry pulp) in the second stage of oxygen bleaching is 3.5%, the dosage of magnesium sulfate (based ...

Embodiment 3

[0033] Screen 2.5g of wood chips with a size not greater than 50×40×8mm (length×width×thickness). The screened wood chips are steamed at 100°C for 25 minutes, and then squeezed with a compression ratio of 4:1. Use 50ml of 75wt% p-toluenesulfonic acid, 10ml of sodium hypochlorite, and 0.5ml of sodium chlorite to pretreat the wood chips at 100°C for 75 minutes to obtain a coarse pulp that is filtered to neutral and then mixed at a stirring speed of 200rpm / min. After ultrasonic treatment for 10 s, the obtained slurry was filtered to neutral. Coarse pulp has undergone staged oxygen delignification without washing, the dosage of sodium hydroxide (based on absolute dry pulp) in the first stage is 3%, the dosage of magnesium sulfate (based on absolute dry pulp) is 3%, and the oxygen pressure is 6bar at 115°C Keep warm for 30 minutes; the dosage of sodium hydroxide (based on dry pulp) in the second stage of oxygen bleaching is 3%, the dosage of magnesium sulfate (based on dry pulp) is...

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Abstract

The invention belongs to the technical field of dissolving pulp preparation, and particularly relates to a preparation method of broadleaf wood dissolving pulp. The preparation method of the broadleaf wood dissolving pulp is characterized by comprising the following steps: (1) carrying out steaming treatment on broadleaf wood chips and then carrying out extrusion treatment; (2) pretreating the extruded wood chips by using a mixed solution of p-toluenesulfonic acid, sodium hypochlorite and sodium chlorite to obtain crude pulp, performing ultrasonic dispersion treatment on the crude pulp, and then washing and filtering the pulp until the crude pulp is neutral; (3) carrying out two-stage oxygen delignification treatment on the slurry; (4) carrying out chlorine dioxide bleaching treatment on the pulp subjected to oxygen delignification; (5) carrying out secondary bleaching treatment on the pulp by using enhanced alkali to obtain the dissolving pulp. The method has the beneficial effects that the reaction condition is mild, the reaction time is short, the pulping process flow is simple, the environmental pollution and machine corrosion are small, and the green concept of modern biorefinery is met.

Description

[0001] (1) Technical field [0002] The invention belongs to the technical field of dissolving pulp preparation, in particular to a method for preparing hardwood dissolving pulp. [0003] (2) Background technology [0004] In recent years, the amount of cotton planted globally has been decreasing, and the supply of cotton linters for pulp production is obviously insufficient. In view of the above situation, the application of dissolving pulp (wood pulp) prepared from wood to replace cotton pulp has received more and more attention. At present, sulfite pulping and kraft pulping process based on pre-hydrolysis are more common in the preparation of dissolving pulp. These methods require severe pulping process conditions, which can only be realized under high temperature and high pressure conditions; the number of bleaching stages is large, generally five There are even more bleaching stages; the production cost is high, the chemicals are difficult to recycle, and the pollution to...

Claims

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Application Information

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IPC IPC(8): D21C1/02D21C1/04D21C1/06D21C3/02D21C3/26D21C9/10D21C9/14D21C9/16
CPCD21C1/02D21C1/04D21C1/06D21C3/02D21C3/266D21C9/144D21C9/163D21C9/1057
Inventor 董翠华沈佩琰尹梦伟庞志强卢宪芹吉海瑞
Owner QILU UNIV OF TECH
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