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Method for preparing furfural from acidified filtrate of pulping black liquid

A technology for pulping black liquor and filtrate, which is applied in the chemical industry and can solve the problems of high treatment cost and environmental pollution.

Inactive Publication Date: 2005-07-06
SHANDONG TRALIN PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In the black liquor treatment of the paper industry, the filtrate produced by acid analysis of lignin contains a large amount of acid, which is used as industrial wastewater, pollutes the environment, and has high treatment costs

Method used

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  • Method for preparing furfural from acidified filtrate of pulping black liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The wheat bran produced in the wheat straw pulping process is removed from impurities such as wheat grains, mud, sand, dust, etc., and the acid analysis filtrate with a pH of 1.5 is put into the acid mixer in a mass ratio of 5:1 to ensure that the wheat bran and filtrate The fully contacted penetration, put the mixed wheat bran and filtrate mixture into the hydrolysis pot, seal and increase the pressure, control the temperature in the hydrolysis pot to 160°C, the pressure to 0.7MPa, the hydrolysis time to 5h, and then pass the hydrolysis steam with a concentration of 10% Na 2 CO 3 solution, so that the pH value of the steam condensate is 7, and then use a bubble column to distill the condensate. During the distillation process, ensure that the temperature at the bottom and top of the tower is relatively stable. ℃, the liquid obtained after the condensation of the obtained fractions is the furfural stock solution, this part of the liquid enters the aldehyde separation t...

Embodiment 2

[0024] The wheat bran produced in the wheat straw pulping process is removed from impurities such as wheat grains, mud, sand, dust, etc., and the acid analysis filtrate with a pH of 1.5 is put into the acid mixer in a mass ratio of 5:1 to ensure that the wheat bran and filtrate The full contact penetration, put the mixed wheat bran and filtrate mixture into the hydrolysis pot, seal and increase the pressure, control the temperature in the hydrolysis pot to 170 ° C, the pressure to 0.5 MPa, the hydrolysis time to 4 hours, and then pass the hydrolysis steam with a concentration of 10% Na 2 CO 3 solution, so that the pH value of the steam condensate is 8, and then the condensate is distilled by using a bubble cap tower. ℃, the liquid obtained after the condensation of the obtained fractions is the furfural stock solution, this part of the liquid enters the aldehyde separation tank for clarification and stratification, the upper part containing furfural is returned for distillati...

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Abstract

The invention relates to a method for preparing furfural from acidified filtrate of pulping black liquid with acid in filtrate and wheat bran from papermaking materials as raw materials. The preparation process comprises the filtrate and wheat bran are mixed in mass ratio of 5:1 and hydrolyzed at 160-170C.,0.5-0.7Mpa, and the hydrolysis lasts for 4-5 hours; the hydrolyzed steam is neutralized by weak lye to pH 7-8 of steam condensate and the condensate is distilled, and the temperatures of tower bottom and tower top are maintained at 102-104C. and 98C. during the process of distillation; and the distilled condensate is allowed to stand and rectified to produce product furfural. The content of furfural obtained by said method can reach 98.7%.

Description

Technical field: [0001] The invention relates to a method for preparing furfural from acid analysis filtrate of pulping black liquor, belonging to the technical field of chemical industry. Background technique: [0002] Furfural, also known as furan formaldehyde, is a direct organic chemical raw material that cannot be synthesized from petrochemical raw materials but can only be produced from agricultural and forestry plant fiber waste. Furfural can not only prepare furfuryl alcohol, furan, tetrahydrofuran, maleic anhydride, furoic acid and other important organic chemical raw materials, but also has a wide range of uses in industries such as synthetic resin, synthetic fiber, synthetic rubber, medicine, pesticide, petroleum refining, dyes, and spices. . [0003] China is one of the big agricultural countries in the world, with a vast area of ​​arable land and a wide variety of crops. During the processing of agricultural and sideline products, there are many leftover waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/48
Inventor 曹光春李洪法杨吉慧吴新年孙冰娜杨继锋李晓光
Owner SHANDONG TRALIN PAPER