Dehydration and deacidification device for refining furfural and refining process

Abstract

The invention belongs to the technical field of a production process of a chemical product of furfural. In order to solve the problems of wastes, increase of equipment burden and the like caused by the reason that dehydration and deacidification are not thorough during furfural production and aldehyde is taken away during dehydration and deacidification, the invention provides a dehydration and deacidification device for refining furfural and a refining process. According to the refining process, crude furfural is subjected to reaction in a dehydration and deacidification tower, acid water changes from a liquid phase to a vapor phase and moves upwards for recovery, aldehyde is changed into a liquid phase and flows downwards into a refining tower, finished product aldehyde is recovered through condensation in the refining tower, and resides are discharged out; and the acid water enters a condenser and changes into a liquid phase, part of the acid water flows back into the dehydration and deacidification tower, part of the acid water flows into a layering tank for layering, the aldehyde is recovered into a crude aldehyde tank after being motionless, the acid water is added into a crude aldehyde stock solution tank from the bottom of a light removing kettle, and organic impurities flow into a light component tank after condensation. Acid of crude aldehyde is recovered completely, the recovery rate of refined aldehyde is improved by 3-5% compared with that of the same industry, the purity of furfural is improved to more than 99.5%, and the quality of the refined aldehyde is stabilized to a premium grade, so that the demands of high-end users on the market can be met.

Description

technical field [0001] The invention belongs to the technical field of chemical product furfural production technology, and in particular relates to a refined furfural dehydration and deacidification device and a refining process. Background technique [0002] The two dehydration and deacidification methods currently used for furfural production in my country are: neutralization with soda ash: neutralize sulfuric acid to neutrality, and then dehydrate with distillation; washing with water: use a large amount of sulfuric acid to dissolve in water and insoluble in aldehydes. Clean water dilutes the acid in furfural to achieve the effect of deacidification. [0003] Both of the above two deacidification methods have a great influence on the recovery rate of furfural. The first method makes furfural resinize in the refining process to form aldehyde sludge, and the recovery rate is low; the second method uses a large amount of clear water. At least 3% of aldehyde must be taken aw...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of incomplete dehydration and deacidification in the existing furfural production, and at the same time, aldehydes are taken away during the dehydration and deacidification process, resulting in waste and increased equipment burden, etc., the present invention provides a refined furfural dehydration and deacidification device and refining process

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