公开(公告)号：DE2410124A1

公开(公告)日：1975-09-11

申请号：DE2410124

申请日：1974-03-02

Applicant: BASF AG

Inventor： WANDELT ERWIN ,  HOCHMUELLER KURT DIPL CHEM DR

IPC: B01D15/04 ,  B01J47/04 ,  C02B1/40

Abstract: In an ion exchange treatment of water, cation mixed with anion exchangers are displaced intermittently in a reaction tank in counterflow to the water. The displaced ion exchangers are sepd., regenerated in individual tanks and recombined in a mixing tank. A side stream of the treated water re-washes the mixt. until all residual ions have been removed; the loaded side stream is recycled with the raw water or used for regeneration. This combines simplicity of operation with a low consumption of chemicals without requiring the considerable additional investment required for the residual ion removal operation.

公开(公告)号：DE4030913A1

公开(公告)日：1992-04-02

申请号：DE4030913

申请日：1990-09-29

Applicant: BASF AG

Inventor： WANDELT ERWIN ,  WAGNER THOMAS

IPC: B01J39/04 ,  B01J39/05 ,  C02F1/42 ,  C02F1/44

Abstract: Process for treating liqs., esp. water, in ion exchangers which for the removal of the hardness-forming ions Ca, Mg, Sr and Ba and all heavy metals are connected in series with a further processing stage of reverse osmosis, whereby a strong acid cation exchanger is used which is converted into the Na form by treatment with acid and then with the effluent water stream from the downstream reverse osmosis process. USE/ADVANTAGE - The process allows hardness forming ions to be removed from the water so that no deposits are formed on the reverse osmosis membrane without the necessity for adding stabilising chemicals to the water, whilst regeneration of the ion exchanger is accomplished without producing an effluent water contg. large amts. of NaCo, which could cause a disposal problem with large scale appts..