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Method for refining furfural

A kind of furfural refining, furfural technology, applied in the direction of organic chemistry, etc., can solve the problems of restricting production, high system energy consumption, low refining yield and the like

Active Publication Date: 2016-12-07
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The whole refining process needs 5-6 towers, the system consumes a lot of energy, and the refining yield is low, which restricts the production

Method used

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  • Method for refining furfural
  • Method for refining furfural

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Embodiment Construction

[0033] The furfural refining method provided by the invention comprises the following steps:

[0034] S1: Primary fractionation section: send the furfural raw material liquid into the primary fractionation tower, so that the furfural raw material liquid is removed from the top of the primary fractionation tower to remove light components, and the bottom of the tower to remove heavy components; Middle distillates of furfural;

[0035] S2: Extraction and separation section: send the furfural-containing middle distillate extracted from the primary distillation tower to the extractor to extract the water-soluble organic matter;

[0036] S3: Refining and separation section: The furfural phase extracted by the extractor is sent to the refining tower, the light components are removed at the top of the refining tower, and a small amount of heavy components produced by heating and other reasons are extracted at the bottom of the tower, and the finished furfural is collected in the towe...

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PUM

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Abstract

The invention relates to a method for refining furfural. The method is characterized by comprising the following steps that S1, furfural raw material liquid is fed into a primary separating rectifying tower, light components of the furfural raw material liquid are removed at the top end of the primary separating rectifying tower, organic acid and heavy components are removed at the bottom end, and a middle fraction containing furfural is extracted in the middle of the tower; S2, treatment in an extraction separation section is carried out, wherein middle fraction, containing furfural, extracted from the primary separating rectifying tower is fed into an extractor, and water-soluble organic matter in the middle fraction is extracted; S3, treatment in a refining separation section is carried out, wherein a furfural phase extracted through the extractor is fed into a refining tower, light components are removed at the top of a refining tower, a small quantity of heavy components generated due to heating and other reasons are extracted at the bottom of the tower, and finished furfural is collected in the tower. According to the method for refining furfural, the chemical process coupling theory is adopted, removal of the light components, removal of the organic water-soluble matter and product refining are organically coupled together, and a separating refining unit is formed. Therefore, the aims of simplifying the process, saving energy, reducing consumption and increasing the yield are achieved.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a furfural refining method. Background technique [0002] One-step production of furfural is based on corn cob as raw material, sulfuric acid as catalyst, high pressure (0.6- [0003] 0.8MPa) steam as the carrier, at 160 degrees, hemicellulose is firstly hydrolyzed into xylose, and then the xylose is dehydrated to form furfural, which is vaporized into the steam phase and leaves the reactor. In addition to water vapor and furfural, the gas leaving the reactor also contains by-products produced during the reaction process, such as organic acids, alcohols, ketones, ethers and other light and heavy components. In the past industry, the reaction liquid was firstly rectified in the primary distillation tower to obtain about 90% gross aldehyde, and then the light components were removed from the light fractionation tower in the light removal primary fractionation tower, and ...

Claims

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Application Information

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IPC IPC(8): C07D307/48C07D307/50
CPCC07D307/48C07D307/50
Inventor 郑学明尚会建刘红梅
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY