Title:
METHOD FOR RECOVERING TAR ACID SALT AND METHOD FOR PRODUCING TAR ACID
Document Type and Number:
WIPO Patent Application WO/2018/198428
Kind Code:
A1
Abstract:
Provided is a method for recovering tar acid salts in a higher recovery. The method for recovering tar acid salts comprises: a coal tar distillation step in which coal tar is distilled to separately obtain naphthalene oil and carbolic oil; a first separation step, in which an aqueous alkali solution is added to the naphthalene oil obtained in the coal tar distillation step, thereby converting tar acids contained in the naphthalene oil into tar acid salts, and the naphthalene oil is separated into oil layer 1, from which the tar acids have been removed, and aqueous layer 1, which contains the tar acid salts; a naphthalene distillation step in which the oil layer 1 separated in the first separation step is distilled to obtain naphthalene light oil; and a second separation step, in which the carbolic oil obtained in the coal tar distillation step is mixed with the aqueous layer 1 separated in the first separation step and with the naphthalene light oil obtained in the naphthalene distillation step, thereby converting tar acids contained in both the carbolic oil and the naphthalene light oil into tar acid salts, and the mixture is separated into oil layer 2, from which the tar acids have been removed, and aqueous layer 2, which contains the tar acid salts.
Inventors:
OSAKA NORIKI (JP)
Application Number:
PCT/JP2017/045760
Publication Date:
November 01, 2018
Filing Date:
December 20, 2017
Export Citation:
Assignee:
JFE CHEMICAL CORP (JP)
International Classes:
C10C1/08
Foreign References:
| JPS61136589A | 1986-06-24 | |||
| JPH0931472A | 1997-02-04 | |||
| JP2017210500A | 2017-11-30 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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