公开(公告)号：DE3118192A1

公开(公告)日：1982-11-25

申请号：DE3118192

申请日：1981-05-08

Applicant: BASF AG

Inventor： MELZER JAROSLAV DIPL ING ,  AUHORN WERNER DIPL ING

IPC: D21C5/02

Abstract: Process for de-inking waste paper by defibration of the waste paper in water to a stock consistency of 1 to 8 % by weight at a temperature from 40 to 90 DEG C in the presence of alkali, wetting agent and flotation aid, residence time of the mixture in the vat, flotation and, if necessary, conventional bleaching of the fibre material, the defibration being carried out in the absence of waterglass, and 0.1 to 2.0 % by weight of a reducing agent, relative to the dry weight of the waste paper, being added at a pH of 8.5 to 12 before the completion of defibration or after this.

公开(公告)号：DE3111615A1

公开(公告)日：1982-10-07

申请号：DE3111615

申请日：1981-03-25

Applicant: BASF AG

Inventor： DEGEN HANS-JUERGEN DR DIPL CHE ,  GUENDER WOLF DR DIPL CHEM ,  LINHART FRIEDRICH DR DIPL CHEM ,  AUHORN WERNER DIPL ING ,  FREY GUENTER DR DIPL CHEM ,  STREIT WERNER DR DIPL CHEM ,  FIKENTSCHER ROLF DR DIPL CHEM

IPC: C02F1/58 ,  B01D21/01 ,  B01D37/02 ,  C02F1/28 ,  C02F1/52 ,  C02F1/54 ,  D21C11/00

Abstract: A process for removing anionic compounds from water which is recycled in manufacturing processes, and from waste water, by adding (1) water-soluble products obtained by reacting an alkylating agent, having an aromatic substituent, with a cationic polyelectrolyte and (2) mineral adsorbents and/or a magnesium salt, aluminum salt or iron salt, with formation and flocculation of water-insoluble reaction products.