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Pulping chemical for papermaking and pulping process using same

A technology for liquid medicine and pulping, applied in the field of papermaking, can solve the problems of dark color, high system operation cost, poor biodegradability, etc., and achieve the effect of clean pulp

Active Publication Date: 2016-07-06
孔凡宾
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, the yield of pulp is low, only about 40%. High temperature, high pressure, and high alkali cooking conditions dissolve lignin, but also degrade and lose more cellulose, resulting in a large amount of cellulose produced in the cooking, washing, and screening processes. Sewage, and the concentration of suspended solids and organic matter in sewage is high, high viscosity, high alkali, dark color, poor biodegradability, large loss of fiber, resulting in low pulp rate
Finally, the production cost is high, the process is complicated, the energy consumption is high, the system operation cost is high, and the cost of wastewater treatment in the later stage is high

Method used

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  • Pulping chemical for papermaking and pulping process using same
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  • Pulping chemical for papermaking and pulping process using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A pulping process using the pulping liquid of the present invention specifically comprises the following steps:

[0016] (1) Preparation of pulping medicinal liquid: add 2 parts of sodium hydroxide, 3 parts of calcium carbonate, 3 parts of magnesium sulfate, 2 parts of sodium salicylate, 2 parts of cellulase and 90 parts of water into the dispensing tank to prepare the medicinal liquid , and then use the chemical pump to transport the prepared liquid medicine to the reaction tank;

[0017] (2) The liquid medicine reacts with the raw materials in the reaction tank, the raw materials are pre-cleaned grass chips and wood chips, the reaction temperature is 70°C, the reaction pressure is normal pressure, and the reaction time is 50 minutes;

[0018] (3) Discharging, deflagging, beating: After the reaction is completed, the obtained material is conveyed out of the tank by a screw at the bottom outlet of the reaction tank, falls on the conveyor belt and sent to the deflaking m...

Embodiment 2

[0021] A pulping process using the pulping liquid of the present invention specifically comprises the following steps:

[0022] (1) Preparation of pulping medicinal liquid: add 3 parts of sodium hydroxide, 2 parts of calcium carbonate, 2 parts of magnesium sulfate, 3 parts of sodium salicylate, 1 part of cellulase, and 100 parts of water into the dispensing tank to prepare the medicinal liquid , and then use the chemical pump to transport the prepared liquid medicine to the reaction tank;

[0023] (2) The liquid medicine reacts with the raw materials in the reaction tank, the raw materials are pre-cleaned grass chips and wood chips, the reaction temperature is 80°C, the reaction pressure is normal pressure, and the reaction time is 40 minutes;

[0024] (3) Discharging, deflagging, beating: After the reaction is completed, the obtained material is conveyed out of the tank by a screw at the bottom outlet of the reaction tank, falls on the conveyor belt and sent to the deflaking ...

Embodiment 3

[0027] A pulping process using the pulping liquid of the present invention specifically comprises the following steps:

[0028] (1) Preparation of pulping medicinal solution: add 1 part of sodium hydroxide, 3 parts of calcium carbonate, 4 parts of magnesium sulfate, 1 part of sodium salicylate, 1.5 parts of cellulase, and 110 parts of water into the dispensing tank to prepare the medicinal solution , and then use the chemical pump to transport the prepared liquid medicine to the reaction tank;

[0029] (2) The liquid medicine reacts with the raw materials in the reaction tank, the raw materials are pre-cleaned grass chips and wood chips, the reaction temperature is 90°C, the reaction pressure is normal pressure, and the reaction time is 30 minutes;

[0030] (3) Discharging, deflagging, beating: After the reaction is completed, the obtained material is conveyed out of the tank by a screw at the bottom outlet of the reaction tank, falls on the conveyor belt and sent to the defla...

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Abstract

The invention relates to the technical field of papermaking, in particular to a pulping chemical for papermaking and a pulping process using the same. The pulping chemical for papermaking is characterized by being prepared from, by weight, 1-7 parts of sodium hydroxide, 1-3 parts of calcium carbonate, 2-4 parts of magnesium sulfate, 1-4 parts of sodium salicylate, 0.5-2 parts of cellulose and 90-110 parts of water. The pulping chemical can react with lignin in grass pieces, straws, woods and other fiber raw materials for modification, changes the lignin into hydrophilic substances, causes water absorption increase of grass piece and lignin structure collapse within a short time and creates powerful conditions for defibering and pulping, the pulping process adopting the pulping chemical is used for non-wood-fiber or wood-fiber pumping, 'no caustic soda' is adopted in the pumping process, 'non-high-temperature steaming, no black liquor production and no wastewater discharge' are achieved, and the pulp is clean, is not needed to be washed with a large amount of water, is free of pollution and has a great significance on full utilization of grass resources in the China papermaking industry.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a pulping liquid for papermaking and a pulping process using the liquid. Background technique [0002] Existing papermaking pulping mainly adopts the following three methods: 1. vertical pot cooking pulping; 2 steaming ball cooking pulping; The stripping of cellulose mainly relies on high alkali, high temperature, and high pressure cooking, and there are many problems. First of all, it seriously pollutes the environment. The discharge of pulping and papermaking wastewater is the largest discharge source of COD in industrial wastewater in my country. Due to the large amount of lignin and some fibers and semi-fibers to be removed, the COD and BOD in the water are as high as 10,000 or more, and it is difficult to treat in the later stage. Standard discharge, causing serious pollution, chemical oxygen demand (COD) refers to the amount of oxidant consumed when the reducing subst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C3/02D21H11/12
CPCD21C3/022D21C5/005D21H11/12
Inventor 孔凡宾
Owner 孔凡宾