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Recycling method of alkaline pulping by-product

A technology of alkaline pulping and by-products, which is applied in the regeneration of pulping liquid, the recovery of pulp by-products, textiles and papermaking, etc. It can solve the problems of low lignin utilization value, large fuel consumption, high operating costs, etc., and achieve improvement Effects of utilization rate and utilization value, reduction of carbon emissions, and exemption from operating costs

Pending Publication Date: 2022-05-13
汪雨欣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method not only has low utilization value of lignin, but more importantly, the evaporation and concentration of black liquor needs to consume a large amount of fuel, so that its operating cost is very high. At the same time, the combustion of fuel and black liquor also generates a large amount of carbon dioxide. At present, these Carbon dioxide is directly emitted into the atmosphere and pollutes the air, which is completely contrary to the goal of "double carbon"

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Build several pools according to the amount of black liquor in the pulp mill. The bottom of each pool is made into an inverted hollow cone with the cone top at the bottom. The cone top of the inverted cone is connected to the drain pipe, and the drain pipe is provided with a valve to control the discharge of the liquid in the pool. In addition, a small-diameter connecting pipe network is arranged in the pool, and many small holes are drilled in the pipe wall around each section of the pipe for exhaust gas. The pipe network is connected with the main pipe that transports flue gas. Control airflow. First, the black liquor is discharged into the first pool through the pipeline for processing. On the other hand, the flue gas in the chimney of the combustion furnace is desulfurized and denitrified, that is, the sulfur oxides and nitrogen oxides in the flue gas are removed, and then the flue gas that has been desulfurized and denitrified is extracted The equipmen...

Embodiment 2

[0015] Example 2: Build several pools according to the amount of black liquor in the pulp mill. The bottom of each pool is made into an inverted hollow cone with the cone top at the bottom. The cone top of the inverted cone is connected to the drain pipe, and the drain pipe is provided with a valve to control the discharge of the liquid in the pool. In addition, a small-diameter connecting pipe network is arranged in the pool, and many small holes are drilled in the pipe wall around each section of the pipe for exhaust gas. The pipe network is connected with the main pipe that transports flue gas. Control airflow. First, the black liquor is discharged into the first pool through the pipeline for processing. On the other hand, the flue gas in the chimney of the combustion furnace is desulfurized and denitrified, that is, the sulfur oxides and nitrogen oxides in the flue gas are removed, and then the flue gas that has been desulfurized and denitrified is extracted The equipmen...

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PUM

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Abstract

The invention relates to a recycling method of an alkaline pulping byproduct. Lignin and alkali in black liquor are separated through step-by-step multiple acidification concentration. The method comprises the following steps: neutralizing the black liquor by using flue gas to reduce the pH value of the black liquor, separating out lignin in the black liquor, greatly improving the concentration of the lignin, enabling the lignin in the black liquor to form large particle precipitates with compact structures by using sulfuric acid and / or a flocculating agent, filtering out the lignin, and further dehydrating the lignin to obtain a lignin product. And causticizing the residual clear liquid after the lignin is stripped by lime, respectively cooking the plant raw material and washing the paper pulp, and using the obtained insoluble calcium salt as a building material. The method can be used for alkaline pulping of woody plants and non-woody plants. And technical support is provided for realizing net zero emission of carbon dioxide.

Description

technical field [0001] The invention relates to the processing and utilization technology of by-products of papermaking, in particular to a method for recycling by-products of alkaline pulping. technical background [0002] At present, the alkali recovery furnace is used to recover caustic soda and lignin in the production of pulp by the alkali process. Although this method does not have direct black liquor discharge, the alkali recovery furnace requires huge investment, long installation and commissioning period, and high operating cost, so that the small pulping enterprise with an annual output of 50,000 tons of pulp cannot implement it and has to close it. Even large and medium-sized pulp mills have the ability to implement this technology, the large amount of black liquor formed by cooking plant raw materials and washing pulp is concentrated by evaporation to remove water, and then burned to remove lignin to recover caustic soda. Using this method not only has low utili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/00
CPCD21C11/0007
Inventor 汪雨欣
Owner 汪雨欣
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