Title:
METHOD FOR PREPARING TAR ACID
Document Type and Number:
WIPO Patent Application WO/2019/187669
Kind Code:
A1
Abstract:
This method for preparing a tar acid includes: a dewatering step for dewatering a crude tar acid; a depitching step for depitching a dewatered crude tar acid; and a continuous distillation step for continuously distilling a depitched crude tar acid, wherein after the dewatering step and before the depitching step or during the depitching step, an oxidant is added to the dewatered crude tar acid, and the column bottom temperature of a distillation column in the depitching step is 160°C or less.
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Inventors:
NAKAMICHI YUKI (JP)
WASAI SATOSHI (JP)
WASAI SATOSHI (JP)
Application Number:
PCT/JP2019/004283
Publication Date:
October 03, 2019
Filing Date:
February 06, 2019
Export Citation:
Assignee:
JFE CHEMICAL CORP (JP)
International Classes:
C10C1/08; C07C37/74; C07C39/04; C07C39/07
Foreign References:
| JPS6081285A | 1985-05-09 | |||
| JPS59210038A | 1984-11-28 | |||
| JPS56115731A | 1981-09-11 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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