METHOD FOR PURIFYING WASTE HYDROCHLORIC ACID

Title:

METHOD FOR PURIFYING WASTE HYDROCHLORIC ACID

Document Type and Number:

WIPO Patent Application WO/2018/088727

Kind Code:

A1

Abstract:

The present invention relates to a method for purifying waste hydrochloric acid and, specifically, to a method for purifying waste hydrochloric acid, comprising the steps of: (S1) preparing an extraction solution by dissolving an extractant in an organic solvent; (S2) extracting a metal component with an organic solvent by injecting the extraction solution into waste hydrochloric acid; (S3) phase separating a water hydrochloric acid layer and the organic solvent containing the metal component; and (S4) obtaining purified hydrochloric acid by recovering the phase separated (fractionated) water hydrochloric acid layer, wherein at least 40 mol of the extractant is used on the basis of 1 mol of Fe contained in the waste hydrochloric acid, and the waste hydrochloric acid and the extraction solution are mixed in a volume ratio of waste hydrochloric acid : extraction solution of 1 to 0.1-1.

Inventors:

EOM HEE JUN (KR)
LEE DONG CHUL (KR)
KIM YEON YI (KR)
CHOI JUNG HO (KR)

Application Number:

PCT/KR2017/011869

Publication Date:

May 17, 2018

Filing Date:

October 25, 2017

Export Citation:

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Assignee:

LG CHEMICAL LTD (KR)

International Classes:

B01D11/02

Domestic Patent References:

WO1991009810A1

1991-07-11

Foreign References:

KR20160038562A	2016-04-07
US5078887A	1992-01-07
JP2010180430A	2010-08-19
KR890000355B1	1989-03-14
US2787525A	1957-04-02
JPS511244B1	1976-01-16

Other References: