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Method for preparing lignosulfonate from papermaking pulping red liquor

A technology for lignosulfonate and pulping, which is applied in the preparation of sugar derivatives, chemical instruments and methods, monosaccharides, etc. The effect of reducing energy consumption

Inactive Publication Date: 2012-07-25
YANBIAN SHIXIAN BAILU PAPERMAKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can effectively reduce the production cost, but the obtained product is relatively single, which makes the application field of the product relatively narrow

Method used

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  • Method for preparing lignosulfonate from papermaking pulping red liquor
  • Method for preparing lignosulfonate from papermaking pulping red liquor
  • Method for preparing lignosulfonate from papermaking pulping red liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Using 2634.8L, pH value of 1.85 acidic sulfite cooking red liquor of coniferous wood as raw material, according to figure 1 The process flow shown prepares calcium lignosulfonate and monosaccharide, see Table 1, Table 2 and Table 3 for relevant parameters of the preparation process, and Table 1 is the experimental conditions and results for the preparation of macromolecular lignosulfonate in the embodiment of the present invention; Table 2 shows the experimental conditions and results for the preparation of middle-molecular lignosulfonate in the examples of the present invention; Table 3 shows the experimental conditions and results for the preparation of monosaccharide and small-molecular lignosulfonates in the examples of the present invention.

[0089] Based on the total amount of lignosulfonate in the red liquid stock solution, the yield of macromolecular calcium lignosulfonate was calculated to be 19.86%, the yield of medium molecular calcium lignosulfonate was 37.2...

Embodiment 2

[0091] Add milk of lime to 2260L, pH value of 2.01 acid sulphite cooking red liquor of coniferous wood, adjust its pH value to 4.86, according to figure 1 The process flow shown prepares calcium lignosulfonate and monosaccharide, see Table 1, Table 2 and Table 3 for relevant parameters of the preparation process, and Table 1 is the experimental conditions and results for the preparation of macromolecular lignosulfonate in the embodiment of the present invention; Table 2 shows the experimental conditions and results for the preparation of middle-molecular lignosulfonate in the examples of the present invention; Table 3 shows the experimental conditions and results for the preparation of monosaccharide and small-molecular lignosulfonates in the examples of the present invention.

[0092] Taking the total amount of lignosulfonate in the red liquid stock solution as a benchmark, the yield of macromolecular calcium lignosulfonate was calculated to be 22.1%, the yield of medium molec...

Embodiment 3

[0094] Add milk of lime to 2400L, pH value of 1.93 acid sulfite cooking red liquor of coniferous wood, adjust its pH value to 5.01, according to figure 1 The process flow shown prepares calcium lignosulfonate and monosaccharide, see Table 1, Table 2 and Table 3 for relevant parameters of the preparation process, and Table 1 is the experimental conditions and results for the preparation of macromolecular lignosulfonate in the embodiment of the present invention; Table 2 shows the experimental conditions and results for the preparation of middle-molecular lignosulfonate in the examples of the present invention; Table 3 shows the experimental conditions and results for the preparation of monosaccharide and small-molecular lignosulfonates in the examples of the present invention.

[0095] Based on the total amount of lignosulfonate in the red liquid stock solution, the calculated yield of macromolecular sodium lignosulfonate is 9.47%, the yield of medium molecular sodium lignosulfo...

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Abstract

The invention provides a method for preparing lignosulfonate from papermaking pulping red liquor, which comprises the following steps of: carrying out ultrafiltration on the papermaking pulping red liquor to obtain first lignosulfonate and filtrate; adding a pH value regulator into the obtained filtrate to obtain precipitates and supernate; carrying out cation exchange chromatographic separation and anion exchange chromatographic separation on the obtained supernate to obtain monosaccharide and eluent; and carrying out nanofiltration on the obtained eluent to obtain second lignosulfonate. According to the invention, the papermaking pulping red liquor is subjected to repeated ultrafiltration, ionic exchange chromatographic separation and nanofiltration, the lignosulfonate is graded to obtain the lignosulfonate with different molecular weight distributions and the monosaccharide. Products obtained by the method provided by the invention have various types and high added value. The application field of the papermaking pulping red liquor product is widened. Moreover, the products obtained by the method disclosed by the invention have high purity, so that the quality of industrial products made of the products serving as raw materials is improved.

Description

technical field [0001] The invention relates to the technical field of papermaking waste liquid treatment, in particular to a method for preparing lignosulfonate from papermaking pulping red liquor. Background technique [0002] In the paper industry, three methods of pulping and cooking are mainly used: the sulfite method, the sulfate method and the caustic soda method. Among them, the pulp washing waste liquid obtained by the sulfite method is reddish brown and is usually called red liquor. A large amount of red liquor will be produced in the pulping and cooking process using the sulfite method, and 11 to 14 tons of red liquor can be produced for every ton of wood pulp produced, and the solid content of the obtained red liquor is about 9.5% to 11.5%. The content of sulfonate is about 5.5% to 6.0%, the content of reducing sugar is about 2.5% to 3.0%, and the content of calcium sulfite and other impurities is about 2.2% to 2.5%. Direct discharge of these waste liquids will c...

Claims

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Application Information

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IPC IPC(8): C08H7/00C07H3/02C07H1/06C02F9/04C02F103/28
Inventor 郑艳民綦建华金昌寿张吉波
Owner YANBIAN SHIXIAN BAILU PAPERMAKING
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