公开(公告)号：US20190023634A1

公开(公告)日：2019-01-24

申请号：US16071553

申请日：2017-11-10

Applicant: LG CHEM, LTD.

Inventor： Si Nae LEE ,  Sung Kyu LEE ,  Joon Ho SHIN

IPC: C07C37/78 ,  C07C39/04 ,  B01D3/36

Abstract: The present invention relates to a method for purifying phenol, which comprises: supplying a feed comprising phenol, acetone, hydroxyacetone and water to a distillation column at 60° C. to 95° C.; separating the feed into a first fraction, which comprises the acetone, and separates to the upper part of the distillation column and a second fraction, which comprises the phenol, and separates to the lower part of the distillation column; and recovering the first fraction and the second fraction, respectively.

公开(公告)号：US20180178141A1

公开(公告)日：2018-06-28

申请号：US15563772

申请日：2016-04-01

Applicant: LG CHEM, LTD.

Inventor： Si Nae LEE ,  Sung Kyu LEE ,  Sang Beom LEE ,  Sung Ho LEE ,  Jeong Seok KIM ,  Joon Ho SHIN ,  Dae Chul JUNG ,  Yong Hee JANG ,  Tae Moon PARK ,  Hyun Jik YI

IPC: B01D3/14 ,  B01D3/32 ,  B01D5/00 ,  G03F7/42

CPC classification number: B01D3/141 ,  B01D3/32 ,  B01D3/4261 ,  B01D5/0063 ,  G03F7/425 ,  H01L27/1288

Abstract: By using the distillation device of the present application, energy loss occurring in a purification process of a solution including a waste stripper and a stripped photoresist resin used in a stripping process of a photoresist can be minimized and the installation cost of the distillation device can be reduced compared to the case in which dual distillation columns are used, thereby increasing the economic feasibility of a process.