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Papermaking red liquor sugar component using method

A technology of red liquid sugar and red liquid, which is applied in the fields of biochemical, fermentation, food, and chemical industry, and can solve the problems of wasting sugar resources, environmental pollution, and utilization of sugar components, etc.

Inactive Publication Date: 2012-06-13
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method partially realizes the comprehensive utilization of red liquor, and the production efficiency is high. However, this method does not make full use of the sugar component on the basis that lignosulfonate and sugar components in the red liquor have been well separated. A lot of sugar resources are wasted, while still causing great pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Calcium carbonate adjusts the pH of papermaking red liquor to 4.8-5.5, clarifies and discards the lower sediment, filters it with a bag filter with a cut-off size of 1 μm, passes the obtained filtrate through a nanofiltration membrane with a molecular weight cut-off of 200, and decolorizes the dialysate with 5‰ activated carbon After decolorization, the sugar solution is passed through an ion exchange resin to remove anions and cations, and the obtained sugar solution is concentrated to prepare ethanol as a carbon source for ethanol fermentation.

Embodiment 2

[0015] Calcium carbonate adjusts the pH of papermaking red liquor to 4.0-5.0, clarifies and discards the lower sediment, and filters it with a bag filter with a cut-off size of 100 μm. Adsorb impurities, decolorize, and then the sugar solution is removed by electrodialysis to remove anions and cations, and the obtained sugar solution is concentrated for hydrogenation and hydrogenolysis to prepare polyols such as ethylene glycol and propylene glycol.

Embodiment 3

[0017] Calcium carbonate adjusts the pH of papermaking red liquor to 4.8-5.5, clarifies and discards the lower sediment, filters through a bag filter with a cut-off size of 100 μm, passes the obtained filtrate through a nanofiltration membrane with a molecular weight cut-off of 200, and dialyzes the clear liquid with 5‰ of activated carbon Decolorization, after decolorization, the sugar solution passes through the ion exchange resin to remove anions and cations, concentrates the obtained sugar solution, and enters the simulated moving bed chromatography to separate, concentrate and crystallize the sugar components in the sugar solution to obtain a mixed solution of functional sugar mannose and miscellaneous sugars .

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PUM

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Abstract

The invention relates to a red liquor using method, namely a sulfite pulping papermaking waste liquid method, in particular to a papermaking red liquor sugar component using method. The papermaking red liquor sugar component using method is characterized in that the red liquor is neutralized, a bag type filter is used for removing macromolecule solid contents and colloid in the red liquor, lignosulfonate in the papermaking red liquor is removed by adopting an ultrafiltration system and a nanofiltration membrane system, and the liquid obtains sugar liquor with the transmittance of 90%, the sugar content in solute of 90% and the conductivity of 200muS / m finally after decoloration and desalination. The sugar liquor can be used for preparing acetone butanol, ethanol, methane and biopesticide in a fermentation mode, or preparing ethylene glycol, propylene glycol and other polyatomic alcohol through hydrogenation and hydrogenolysis, or preparing sweet dew sugar and wood sugar in a grading concentration and purification mode by using a simulation moving bed chromatograph. The papermaking red liquor sugar component using method solves the pollution problem of the papermaking red liquor existing for a long period, and achieves high-efficient and high-value use of the red liquor resources, especially the sugar resources.

Description

technical field [0001] The invention belongs to the technical field of biochemical industry, and particularly relates to a method for utilizing sugar resources in papermaking red liquor, that is, after separating lignosulfonate components and sugar components in red liquor through a membrane system, decolorization, impurity removal, concentration, etc. The process prepares high-purity sugar liquid for use in fermentation, chemical industry, food and other fields. Background technique [0002] The waste liquor from sulfite pulping in the paper industry is called red liquor, which is the main source of wastewater in the paper industry. Red liquor contains a large amount of lignosulfonate, sugar and other organic and inorganic substances, and has high BOD, COD and chroma. If it is discharged directly, it will not only pollute the environment, but also cause a lot of waste of available resources. Therefore, the treatment and comprehensive utilization of red liquor is an importa...

Claims

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Application Information

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IPC IPC(8): D21C11/02C13K13/00C13K1/04
Inventor 陈洪章贺芹郑艳民綦建华
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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