Production method for ultra-clean high-purity ethyl acetate

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...

AI Technical Summary

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 and other methods, remove water, acetic acid, ethanol and other impurities in ethyl acetate, and obtain ethyl acetate with a purity of 99% , however, this patent also needs to add a large amount of extractant, which makes it difficult to control the metal content of the finished product. In addition, due to the high energy consumption of extractive distillation, the production cost is also high

[0006] In summary, there is no relevant report about the large-scale production of high-quality (single cation, particle) ethyl acetate method