Production method for ultra-clean high-purity ethyl acetate

A technology of ethyl acetate and a production method, which is applied in the production field of ultra-clean and high-purity ethyl acetate, can solve the problems of high energy consumption in extraction and rectification, high production cost, difficulty in controlling the metal content of finished products, etc., and achieve simple process and low consumption. can low effect

Inactive Publication Date: 2015-11-11
SUZHOU CRYSTAL CLEAR CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can effectively separate impurities such as moisture, acetic acid, and ethanol contained in ethyl acetate, and obtain ethyl acetate with a purity of 99.5%. The addition of additives will inevitably introduce metal impurities, making it difficult to control the metal content of the finished product, and the finished product is not suitable for the electronics industry
[0005] Patent application number: 201410383047 Chinese invention patent Purify ethyl acetate by extractive distillation, pressure regulating distillation an

Method used

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Examples

Experimental program
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Example Embodiment

[0043] Example 1

[0044] This embodiment provides a continuous production method of ultra-clean and high-purity ethyl acetate. Industrial-grade ethyl acetate is sequentially carried out continuously according to the process of adsorbent pretreatment→membrane filtration→molecular sieve dehydration→ion exchange resin adsorption→circulation filtration. as follows:

[0045] (1) Adsorbent pretreatment: pump industrial-grade ethyl acetate into the adsorbent pretreatment tower at a constant flow rate of 300L / h. The ethyl acetate flows in from the bottom of the tower and flows out from the top of the tower. The adsorbent is diatomite and fine pores The mixture of silica gel, the volume ratio of diatomaceous earth and fine-pore silica gel is 1:2, and the filling amount of the adsorbent accounts for 70% of the volume of the adsorbent pretreatment tower;

[0046] (2) Membrane filtration: The pretreated ethyl acetate flows through the separation membrane at a constant flow rate, the mem...

Example Embodiment

[0051] Example 2

[0052] A kind of continuous production method of ultra-clean high-purity ethyl acetate, implementation method is basically the same as embodiment 1, difference is in:

[0053] The flow rate of the adsorbent pretreatment step is controlled at 200L / h, and the pressure of the membrane filtration step is maintained at 2-3.5bar.

Example Embodiment

[0054] Example 3

[0055] A kind of continuous production method of ultra-clean high-purity ethyl acetate, implementation method is basically the same as embodiment 1, difference is in:

[0056] The volume ratio of anion exchange resin to cation exchange resin is 1:3.

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Abstract

The invention relates to a production method for ultra-clean high-purity ethyl acetate. The method comprises the following steps: with industrial-grade ethyl acetate as a raw material, carrying out successive and continuous adsorbent pretreatment and membrane filtration so as to obtain a semi-finished ethyl acetate product, and successively subjecting the semi-finished ethyl acetate product to steps of molecular-sieve dehydration, ion exchange resin and circulating filtration for purification so as to obtain the ultra-clean high-purity ethyl acetate. Through optimization of a purification route and process conditions, the preparation method for the ultra-clean high-purity ethyl acetate can finally prepare electric grade high-quality ethyl acetate which has a single metal ion content of less than 1 ppb and more than 0.2 [mu]m and a particle size of less than 100 particle/mL and is applicable to electronic industry.

Description

technical field [0001] The invention relates to a production method of ultra-clean and high-purity ethyl acetate, in particular to a production method of electronic-grade ultra-clean and high-purity ethyl acetate suitable for wet chemicals. Background technique [0002] Ultra-clean and high-purity electronic chemicals are key raw materials in the electronics manufacturing industry, and their purity and cleanliness have an important impact on the yield, conductivity, and stability of finished products. The higher the purity of high-purity electronic chemicals, the greater the added value. At present, high-purity electronic chemical production technology is monopolized by a few countries such as Germany, the United States, Japan, and South Korea. my country is currently only producing low-end electronic chemicals with low added value. Therefore, the research and development of ultra-clean and high-purity electronic chemicals has extremely high strategic value and economic ben...

Claims

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Application Information

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IPC IPC(8): C07C67/56C07C69/14
CPCC07C67/56C07C69/14
Inventor 陈利华刘兵朱一华
Owner SUZHOU CRYSTAL CLEAR CHEMICAL CO LTD
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