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Method for recovering butyl acetate

A technology of butyl acetate and extractant, which is applied in the field of butyl acetate recovery, to achieve the effect of increased concentration, simple equipment and low recovery cost

Inactive Publication Date: 2012-03-14
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of method for reclaiming butyl acetate at the deficiencies of the existing method for reclaiming butyl acetate in an aqueous solution containing butyl acetate, which has the advantages of small investment, easy operation, low processing cost, and short processing cycle Features

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  • Method for recovering butyl acetate

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Embodiment 1

[0024] A method for reclaiming butyl acetate, its concrete steps are as follows:

[0025] (1) Extraction

[0026] For preparing the waste water containing butyl acetate produced in the lovastatin drug production process, wherein the butyl acetate content is 0.7%, the extractant adopted is liquid paraffin, and the extractant: the volume ratio containing butyl acetate aqueous solution is 1: 1. Mix and stir for 20 minutes.

[0027] (2) Re-extraction

[0028] After step (1) is completed, the extraction mixture in step (1) is left to stand for 10 minutes and separated for 10 minutes, and the upper organic phase and the lower aqueous phase are collected respectively. Continue to use the collected organic phase as the extractant, according to the organic phase extractant: the volume ratio of the aqueous solution containing butyl acetate is a ratio of 1: 1, add the aqueous solution containing butyl acetate to the organic phase extractant, mix and stir for 20min to carry out further ...

Embodiment 2

[0034] A method for reclaiming butyl acetate, its concrete steps, with embodiment 1, wherein:

[0035] In the 1st (1) step, the extractant adopted is 200# solvent oil in high boiling point solvent oil, extractant: the volume ratio containing butyl acetate aqueous solution is 1: 3, mix and stir 5min.

[0036] In step (2), the extraction mixture was left to stand for 5 minutes to separate layers. The volume ratio of organic phase extractant: aqueous solution containing butyl acetate is 1:3, and the mixture is stirred for 5 minutes for re-extraction. The re-extracted mixture was left to stand and stratified again for 5 min, and this was repeated 10 times.

[0037] In step (3), the last collected organic phase is placed in a rectification tower, and the rectification temperature is 160°C.

[0038] In the (4) step, the pH value of the strong alkali solution of sodium hydroxide is 12, and the volume ratio of high boiling point substance (ie extractant): strong alkali solution is 1...

Embodiment 3

[0040] A method for reclaiming butyl acetate, its concrete steps, with embodiment 1, wherein:

[0041] In step (1), the extractant used is light diesel oil, and the volume ratio of extractant: aqueous solution containing butyl acetate is 1: 10, and the mixture is stirred for 50 minutes.

[0042] In step (2), the extraction mixture was left to stand and stratified for 15 minutes. The volume ratio of organic phase extractant: aqueous solution containing butyl acetate is 1:10, and the mixture is stirred for 50 minutes for re-extraction. The re-extraction mixture was left to stand and stratified again for 15 min, and this was repeated 10 times.

[0043] In step (3), the last collected organic phase is placed in a rectification tower, and the rectification temperature is 140°C.

[0044] In the 4th step, the pH value of the strong alkali solution of sodium hydroxide is 14, and the volume ratio of high boiling point substance (ie extractant): strong alkali solution is 1: 1, stir an...

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Abstract

The invention relates to a method for recovering butyl acetate, belonging to the technical field of organic solvent recovery. A water solution containing the butyl acetate in the production process of pharmaceutical industry is extracted, distilled and regenerated with an extraction agent to recover the butyl acetate. The method has the advantages of simple process, simple and convenient operation, simple equipment, high extraction efficiency, short recovery period and large quantity of treated sewage, and can be suitable for the treatment of different water qualities of water solutions containing the butyl acetate. Resources are fully utilized, which is beneficial to the environment protection. The method has the characteristics of low recovery cost, convenient popularization and application, and the like. The invention can be widely applied to the treatment of the recovery of the butyl acetate in a water solution system containing the butyl acetate during the industrial enterprise production, and is especially suitable for the recovery of the butyl acetate in the water solution containing the butyl acetate in the production process of the pharmaceutical industry.

Description

technical field [0001] The invention belongs to the technical field of recovering organic solvents, in particular to a method for recovering butyl acetate in an aqueous solution containing butyl acetate in the production process of the pharmaceutical industry. Background technique [0002] In the pharmaceutical industry, bioactive substances with medicinal value such as lovastatin, penicillin, and erythromycin produced by biological fermentation are mainly composed of fermentation, filtration, extraction, stripping, crystallization and other processes. Based on its good physical properties, better extraction effect and low emulsification tendency, butyl acetate is widely used as an extractant in the pharmaceutical industry to produce wastewater containing butyl acetate. In the wastewater containing butyl acetate produced in the production process, its COD value can be as high as 25,000-30,000 mg / L. When treating wastewater, butyl acetate must be recovered first, and then tre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/26C07C67/58C07C69/14
CPCY02W10/37
Inventor 谭世语陈红梅徐迪罗自萍张红晶李伟刘子林
Owner CHONGQING UNIV