Process for pre-treating waste liquid of p-benzoic acid by complexing and extraction
Title:
Process for pre-treating waste liquid of p-benzoic acid by complexing and extraction
Application Number:
00129794
Application Date:
2000/10/13
Announcement Date:
2001/04/04
Pub. Date:
Publication Number:
1289725
Announcement Number:
1119286
Grant Date:
Granted Pub. Date:
2003-8-27
ApplicationType:
Invention
State/Country:
11[China|beijing]
IPC:
C02F 1/26
Applicant(s):
Qinghua Univ.
Inventor(s):
Li Zhenyu, Qiu Wei, Dai Youyuan
Key Words:
pre-treating, waste liquid, p-benzoic acid, complexing, extraction
Abstract:
A process for pre-treating waste solution of benzoic acid includes such steps as preparing extractant from complexing agent, cosolvent and diluent, multi-stage extracting at ordinary-temp until its chemical oxygen consumption value conforms with discharge standard, and sampling analysis of COD cr, pH value and water-phase hydrogen ion concentration at each stage. It can be used to recover phenol, phenylamine and organic acid.
Claim:
Priority:
PCT:
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