Global Patent Index - EP 1086043 A1

EP 1086043 A1 2001-03-28 - WASTE ACID RECOVERY

Title (en)

WASTE ACID RECOVERY

Title (de)

WIEDERGEWINNUNG VON ABFALLSÄURE

Title (fr)

RECUPERATION D'ACIDE EPUISE

Publication

EP 1086043 A1 (EN)

Application

EP 98962803 A

Priority

  • US 9821275 W
  • US 9806400 W

Abstract (en)

[origin: WO9950177A1] A process for purifying a sulfuric acid solution such as by cooling a sulfuric acid solution to at or near its freezing point to form a slurry of a solid phase and a liquid phase. The slurry has an acid-rich region and an acid-poor region. The acid-rich region is separated from the acid-poor region on the basis of density.

IPC 1-7 (main, further and additional classification)

C01B 17/90; C01B 17/92; C02F 1/22

IPC 8 full level (invention and additional information)

C01B 17/90 (2006.01); C01B 17/92 (2006.01); C02F 1/22 (2006.01); C02F 1/38 (2006.01)

CPC (invention and additional information)

C02F 1/38 (2013.01); C01B 17/905 (2013.01); C01B 17/92 (2013.01); C02F 1/22 (2013.01); Y02P 20/145 (2015.11)

Citation (search report)

See references of WO 9950177A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9950177 A1 19991007; AU 1796099 A 19991018; CN 1292766 A 20010425; EP 1086043 A1 20010328; JP 2003526589 A 20030909

INPADOC legal status


2008-05-16 [REG HK WD] APPLICATIONS WITHDRAWN, DEEMED TO BE WITHDRAWN, OR REFUSED AFTER PUBLICATION IN HONG KONG

- Document: HK 1036267

2004-11-03 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20040430

2002-04-10 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20020225

2001-03-28 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20001017

2001-03-28 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE