Method for producing of ultra-clean and high-purity N-methyl pyrrolidone
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United States of America Patent
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Aug 27, 2013
Grant Date -
Mar 22, 2012
app pub date -
Nov 1, 2010
filing date -
Sep 17, 2010
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Abstract
The present invention provides a method for producing of ultra-clean and high-purity N-methyl pyrrolidone through using industrial grade N-methyl pyrrolidone as raw material. After the pretreatment, sorption and dehydration with 4A molecular sieve, twice membrane filtrations are carried out through using β-cyclodextrin composite membrane for the first and 18-crown-6 composite membrane for the second. The filtrate is rectified under vacuum and filtered through using complexant composite microporous membrane to obtain the product. The ultra-clean and high-purity N-methyl pyrrolidone, produced by the method provided by the present invention, is up to the SEMI C8 standard. And the purity of the product is over 99.8%, the moisture content is less than 0.03%, and the content of single metal ion is less than 1 ppb. Comparing to the prior art, the present invention has the advantage such as the stable quality of the product, simple operation, and is suitable for industrial continuous production.
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