Method for separating ethyl acetate-ethyl alcohol compound

An ethyl acetate and mixture technology, which is applied in the field of novel extractant for separating ethyl acetate-ethanol mixture, can solve the problems of reduced tower efficiency, small processing capacity, and high operating cost, achieves optimized production process, simple production device, and is beneficial to industrialization Effect

Inactive Publication Date: 2013-12-25
TIANJIN CLEANTECH TECH
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AI Technical Summary

Problems solved by technology

The main disadvantage of this method is that the operating pressure of the pressurized tower is 0.3-1.0MPa. If the operating pressure is too high, the efficiency of the tower will be greatly reduced, which is not conducive to heat transfer and increases energy consumption; the pressurized operation requires high performance of the tower equipment
The main disadvantages of this method are: a large amount of solvent is used, the operation cost is high, and the energy loss is serious; the problem of extraction agent recovery is not mentioned in the article, and resources are wasted; amides and sulfur-containing organic solvents are easy to cause environmental pollution and poor safety
This method has high requirements on the purity of raw materials (ethanol mole fraction is 0.01-0.40), the processing capacity is small, and the ionic liquid cannot be continuously recycled, which is not conducive to large-scale production

Method used

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  • Method for separating ethyl acetate-ethyl alcohol compound
  • Method for separating ethyl acetate-ethyl alcohol compound

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] According to attached figure 1 As shown, in a rectification column equipped with 50 theoretical plates, the operating pressure is 101.3kPa, and the ethyl acetate-ethanol mixture (mass fraction is 71% and 29%) flows from the rectification column at a rate of 1000kg / h Feed from 25 theoretical plates, the extractant 1-ethyl-3-methylimidazolium tetrafluoroborate is fed from the 10th theoretical plate of the rectification tower, the solvent ratio is 1, the reflux ratio is 0.5, ethyl acetate The ester is extracted from the top of the rectification tower at a rate of 708.5kg / h, and the composition is 99.80% ethyl acetate, 0.21% ethanol, and the yield of ethyl acetate is 99.58%; Enter the recovery tower equipped with 19 theoretical plates at the 10th theoretical plate, the operating pressure is 101.3kPa, the reflux ratio is 2.0, ethanol is extracted from the top of the recovery tower at a rate of 287.7kg / h, and the composition is ethyl acetate Ester 0.13%, ethanol 99.87%, etha...

Embodiment 2

[0031] According to attached figure 1 As shown, in a rectifying tower equipped with 55 theoretical plates, the operating pressure is 85kpa, and the ethyl acetate-ethanol mixture (mass content is 55% and 45% respectively) flows from the rectifying tower 44 at a rate of 1000kg / h. Feed at the first theoretical plate, the extractant is a complex solvent composed of 1-ethyl-3-methylimidazolium tetrafluoroborate and N-methylpyrrolidone mixed with a volume ratio of 1:1, from the 11th block of the rectifying tower Feed at the theoretical plate, the solvent ratio is 1, the reflux ratio is 1, ethyl acetate is extracted from the top of the rectification tower at a rate of 656.9kg / h, and the composition is ethyl acetate 99.88%, ethanol 0.12%, ethyl acetate The yield is 99.42%; the extractant-ethanol mixture enters the recovery tower equipped with 19 theoretical plates at the 10th theoretical plate after being extracted from the rectifying tower tank, the operating pressure is 65kPa, the r...

Embodiment 3

[0033] According to attached figure 1 As shown, in a rectification column equipped with 40 theoretical plates, the operating pressure is 101.3kPa, and the ethyl acetate-ethanol mixture (mass content is 85% and 15%) flows from the rectification column at a rate of 1000kg / h Feed at 30 theoretical plates, the extractant is a composite solvent composed of 1-ethyl-3-methylimidazole acetate and 1,3-dimethylimidazole phosphate dimethyl salt at a volume ratio of 1:1, from Feed at the 10th theoretical plate of the rectification tower, the solvent ratio is 0.5, the reflux ratio is 0.2, ethyl acetate is withdrawn from the top of the rectification tower at a rate of 847.9kg / h, and the composition is ethyl acetate 99.91%, ethanol 0.09%, the yield of ethyl acetate is 99.67%; the extractant-ethanol mixture enters the recovery tower equipped with 15 theoretical plates at the 7th theoretical plate after being extracted from the rectifying column tank, the operating pressure is 85kPa, and the r...

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Abstract

The invention provides a method for separating ethyl acetate-ethyl alcohol, which comprises the following steps: adopting ethyl acetate-ethyl alcohol compound in any proportion as a raw material, taking ionic liquid or a double solvent composed of ionic liquid and an organic solvent as an extraction agent, and extracting ethyl acetate and ethyl alcohol in sequence after the raw material goes through an extractive distillation stage and an extraction agent recycle stage, wherein the extraction agent is used circularly after being extracted in the recycle stage. Compared with the prior art, the new method has the advantages that the energy can be conserved by more than 40%, the environment pollution can be avoided, the product purity is high, the industrialization is facilitated, the equipment cost is low, and the economic benefit is good.

Description

technical field [0001] The invention belongs to the field of separation of ethyl acetate-ethanol systems, in particular to a method for separating ethyl acetate-ethanol mixture with a novel extractant. Background technique [0002] Ethyl acetate is a colorless, low-toxic organic substance. As an important organic chemical raw material and industrial solvent, it is widely used in the production of ethyl fiber, synthetic rubber, artificial leather, adhesives, flavors and fragrances, etc. It is used as an extractant in the separation of pharmaceuticals and natural products. At present, the method for producing ethyl acetate is mainly the esterification of ethyl acetate, by adding excess ethanol to increase the yield of ethyl acetate, and excess ethanol can form an azeotrope with ethyl acetate under normal pressure, which is difficult to achieve by ordinary Ethyl acetate with higher purity can be obtained by rectification. [0003] Chinese patent CN102942475A proposes a method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/54C07C31/08C07C29/84
CPCY02P20/54
Inventor 张学岗张静安喜报刘通
Owner TIANJIN CLEANTECH TECH
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