Jaewon Industrial Co., Ltd

Hwa Yeong Choi

Sung Won Shim

Byung Ki Son

Youn Soo Shin

Hwan Choi

Tae Gi Choi

Yeong Su Choo

Ho Jeong

Jae Won Shim

In a method for preparing a cathode of a secondary battery, a method for preparing a purified N-methyl pyrrolidinone (NMP), and a method for purifying a waste NMP, an inhibitor is added to prevent NMP from being decomposed to produce formaldehyde during the process. 1. The inhibitor may be a phenol-based antioxidant and/or an amine-based light stabilizer.

Method for preparing a cathode of a secondary battery and a purified N-methyl pyrrolidone, and purifying a waste N-methyl pyrrolidone using an inhibitor

Provided is a method for purifying an alkylene glycol monoalkyl ether carboxylic acid ester (AGAECE) for photoresist processing, wherein the method comprises the step of distillation after passing industrial AGAECE through a porous adsorbent impregnated with a basic material, and it is possible to obtain a semiconductor-grade high-purity AGAECE maintaining a low acid value and high purity according to the present invention.

Method for purifying an alkylene glycol monoalkyl ether carboxylic acid ester having high-purity used in photo resist process

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Yeosu-si, South Korea

Hwa Yeong Choi