Global Patent Index - EP 0988254 A1

EP 0988254 A1 2000-03-29 - PROCESS AND AGENT FOR WATER PURIFICATION

Title (en)

PROCESS AND AGENT FOR WATER PURIFICATION

Title (de)

VERFAHREN UND PRÄPARAT ZUR SÄUBERUNG VON WASSER

Title (fr)

PROCEDE ET AGENT DE PURIFICATION D'EAU

Publication

EP 0988254 A1 (EN)

Application

EP 98926015 A

Priority

  • SE 9801027 W
  • SE 9702056 A

Abstract (en)

[origin: WO9854097A1] Process for the purification of alkaline waste water containing anionic compounds that may react with calcium and form water insoluble precipitates. A precipitating agent is added to the waste water. The agent contains a soluble calcium salt and a cationic polymer with molecule weight in the range of 1 to 12 millions in proportion by weight from 10:1 to 100:1 in an amount corresponding to 0.001 to 3 g calcium ion and the corresponding amount polymer per litre waste water. The formed precipitate is removed by using known techniques for the separation of solid and liquid substances.

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

C02F 1/52; B01D 17/05; C02F 1/56

IPC 8 full level (invention and additional information)

C02F 1/52 (2006.01); C02F 1/56 (2006.01)

CPC (invention and additional information)

C02F 1/5236 (2013.01); C02F 1/56 (2013.01)

Citation (search report)

See references of WO 9854097A1

Designated contracting state (EPC)

DE DK ES FI FR GB SE

EPO simple patent family

WO 9854097 A1 19981203; AU 7794398 A 19981230; EP 0988254 A1 20000329; SE 512118 C2 20000131; SE 9702056 D0 19970530; SE 9702056 L 19981228

INPADOC legal status


2002-10-23 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20020312

2001-09-12 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010731

2000-03-29 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19991227

2000-03-29 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE DK ES FI FR GB SE