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Method for pre-treating wood chips by hot water before preparing chemi-mechanical pulp and pulping method by using same

A chemical mechanical and pretreatment technology, applied in the direction of water/steam pretreatment, etc., can solve the problems of increasing the cost of waste liquid treatment, increasing the load of pulping waste liquid, and affecting the paper production process, so as to save energy consumption in beating and reduce grinding The effect of pulp energy consumption and easy operation

Active Publication Date: 2014-05-14
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Along with the dissolution of hemicellulose, some anionic garbage (DCS) and other substances will continue to accumulate, and will continue to enrich with the closed cycle of the water system, which will affect the production process of papermaking, such as causing changes in the chemical properties of the wet end of the paper machine The operation stability of the paper machine will also increase the pulping waste liquid load and increase the cost of waste liquid treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] A method for pretreating wood chips with hot water before preparing chemical mechanical pulp, the steps are as follows:

[0088] ⑴Screen wood chips with qualified size (length and width between 10-30mm and thickness between 3-6mm) from the obtained wood chips, soak the screened wood chips in hot water at 90°C for 30 minutes, and then soak them in hot water The soaked wood chips are screw-extruded, and the compression ratio of the screw-extrusion is 4:1;

[0089](2) Add water to the wood chips processed by screw extrusion, so that the absolute dry mass of the wood chips and the total liquid volume ratio after adding water are 1:4 (kg:L), and put the mixture of wood chips and water in the digester Or carry out self-hydrolysis pretreatment in a pressure vessel. During the cooking process, the heating time is controlled at 30 minutes, the cooking temperature is 140°C, and the holding time is 30 minutes;

[0090] (3) Extract the pre-hydrolyzed solution in the cooking pot or...

Embodiment 2

[0105] A method for pretreating wood chips with hot water before preparing chemical mechanical pulp, the steps are as follows:

[0106] ⑴Screen wood chips with qualified size (length and width between 10-30mm and thickness between 3-6mm) from the obtained wood chips, soak the screened wood chips in hot water at 90°C for 30 minutes, and then soak them in hot water The soaked wood chips are screw-extruded, and the compression ratio of the screw-extrusion is 4:1;

[0107] (2) Add water to the wood chips processed by screw extrusion, so that the absolute dry mass of the wood chips and the total liquid volume ratio after adding water are 1:4 (kg:L), and put the mixture of wood chips and water in the digester Or carry out self-hydrolysis pretreatment in a pressure vessel. During the cooking process, the heating time is controlled at 35 minutes, the cooking temperature is 150°C, and the holding time is 20 minutes;

[0108] (3) Extract the pre-hydrolyzed solution in the cooking pot ...

Embodiment 3

[0123] A method for pretreating wood chips with hot water before preparing chemical mechanical pulp, the steps are as follows:

[0124] ⑴Screen wood chips with qualified size (length and width between 10-30mm and thickness between 3-6mm) from the obtained wood chips, soak the screened wood chips in hot water at 90°C for 30 minutes, and then soak them in hot water The soaked wood chips are screw-extruded, and the compression ratio of the screw-extrusion is 4:1;

[0125] (2) Add water to the wood chips processed by screw extrusion, so that the absolute dry mass of the wood chips and the total liquid volume ratio after adding water are 1:6 (kg:L), and put the mixture of wood chips and water in the digester Or carry out self-hydrolysis pretreatment in a pressure vessel. During the cooking process, the heating time is controlled at 30 minutes, the cooking temperature is 140°C, and the holding time is 60 minutes;

[0126] (3) Extract the pre-hydrolyzed solution in the cooking pot or...

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Abstract

The invention relates to a method for pre-treating wood chips by hot water before preparing chemi-mechanical pulp. The method comprises the following steps: after soaking the wood chips, spirally extruding the wood chips; adding water into the wood chips which are spirally extruded, carrying out self-hydrolyzing pre-treatment on a mixture of the wood chips and water, and obtaining a pre-hydrolysate and the wood chips after self-hydrolyzing pre-treatment; and collecting the extruded wood chips as a raw material of chemi-mechanical pulp to obtain the wood chips after pre-treatment by hot water. The pre-treatment method provided by the invention fully uses existing part of equipment in the pulping industry without external complex equipment, and only water, small amount of dilute acids and ethanol are used without purchasing other chemicals, so that the pre-treatment process can be realized, thereby greatly saving the comprehensive production cost. Meanwhile, the method is beneficial for effectively combining pulping and papermaking with bio-refinery by existing enterprises.

Description

technical field [0001] The invention belongs to the technical field of pulping, papermaking and utilization of biomass resources, in particular to a method for pretreating wood chips with hot water before preparing chemical mechanical pulp, that is, autohydrolysis treatment, and a pulping method using the method. Background technique [0002] Biomass is the most abundant and inexhaustible renewable resource on the earth. It is the fourth largest energy material on the earth after coal, oil and natural gas resources. The annual output reaches 170 billion tons. These Abundant biomass resources are of great significance to the sustainable development of the world economy, the realization of environmental protection and the effective utilization of resources. If the pulp and paper industry can make good use of biomass resources, while producing pulp, it can also convert its residues into high value-added materials, chemicals and fuels, which will be very beneficial to the develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C1/02
Inventor 侯庆喜刘苇
Owner TIANJIN UNIV OF SCI & TECH
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