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Method for recovery of furfural and acetic acid from furfural stripping steam condensate

A technology for stripping steam and condensate, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of being unable to be used as acetic acid extractant, high solubility, loss of extractant, etc., and achieve reduced processing difficulty and improved chemical properties The effect of stability and efficiency improvement

Active Publication Date: 2015-06-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although ethyl acetate has a large distribution coefficient, the solubility of ethyl acetate in water is too large, resulting in serious loss of extractant, making it unable to be used as an extractant in the recovery process of acetic acid

Method used

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  • Method for recovery of furfural and acetic acid from furfural stripping steam condensate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The concentrations of furfural and acetic acid in furfural stripping steam condensate were 5.2% (wt) and 1.6% (wt), respectively.

[0026] The extractant is a mixed solvent of benzene, ethyl acetate and trichlorethylene, wherein benzene accounts for 40wt%, ethyl acetate accounts for 20wt%, and trichlorethylene accounts for 40wt%.

[0027] The pulse packing extraction tower is filled with wire mesh corrugated packing, the effective height is 5 meters, which is equivalent to 10 theoretical plates, the feed ratio of extraction agent and furfural stripping steam condensate is 3:1, the extraction temperature is 31°C, and the pulse frequency is 2s -1 , after the operation stabilized, the temperatures of the extract phase and the raffinate phase were 36°C and 40°C, respectively.

[0028] The extraction agent regeneration tower is filled with wire mesh corrugated packing, the effective height is 4 meters, which is equivalent to 28 theoretical trays, the feeding position is equi...

Embodiment 2

[0032] It is basically the same as Example 1, but the feed ratio of extractant to furfural stripping steam condensate is 1:1.

Embodiment 3

[0034] It is basically the same as Example 1, but the feed ratio of extractant to furfural stripping steam condensate is 5:1.

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Abstract

The invention relates to a method for recovery of furfural and acetic acid from a furfural stripping steam condensate, and the method is as follows: countercurrent contact of the furfural stripping steam condensate and an extractant is performed in an extraction tower to obtain an extraction phase containing the extractant, the furfural, the acetic acid and trace of water in a tower kettle and obtain an extraction residue phase being water containing trace of the furfural and the acetic acid at the tower top; the extraction phase enters into an extractant regeneration tower for separation to obtain the extractant and a small amount of the water at the tower top, and a tower top organic phase returns back to the extraction tower for cycle use after cooling, a water phase as wastewater is discharged, and a furfural and acetic acid mixture containing no water is obtained in the tower kettle; the furfural and the acetic acid mixture enters into a finished product tower for separation to obtain a furfural product with the purity of being greater than 99wt% in the tower kettle and obtain an acetic acid product with the purity of being greater than 99wt% at the tower top. The method can simultaneously recover the furfural and the acetic acid, the recovery rate is higher than 90%, the purity of products is higher than 99%, the extraction efficiency is high, and the unit energy consumption is less.

Description

technical field [0001] The invention belongs to the technical field of purification of chemical products, and in particular relates to a method for simultaneously extracting and recovering furfural and acetic acid from a furfural aqueous solution by using a composite solvent. Background technique [0002] Furfural, also known as furfural, is an important heterocyclic organic compound. So far, furfural can only be produced from plant fibers, mainly corncobs, bagasse, etc., and it is also one of the few bio-based platforms that use lignocellulosic biomass as raw materials for large-scale commercial production Chemicals. [0003] The traditional production of furfural is based on plant straw rich in hemicellulose (such as corncobs, bagasse, etc.). Under the action of sulfuric acid catalyst, the hemicellulose in lignocellulose is first hydrolyzed to generate pentoses, and the pentoses are then Furfural is generated by dehydration ring. Because furfural is particularly prone t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/48C07C53/08C07C51/48
CPCC07C51/48C07D307/48C07C53/08
Inventor 薄德臣王海波齐慧敏高景山张龙
Owner CHINA PETROLEUM & CHEM CORP