Ion exchanger and method for the production thereof

Details Ion exchanger and method for the production thereof Ion exchanger and method for the production thereof

1973-08-20

1976-04-06

Weinblatt, Mayer

Compositions

Water-softening or purifying or scale-inhibiting agents

Water-insoluble base-exchange agent containing

210 40, 252193, 423181, B01D 1500, B01J 104

Patent

active

039487911

ABSTRACT:
An ion exchanger consisting of crushed lignite or brown coal retaining alkali ions, which is obtained by immersing the particles in a dilute caustic alkali solution. The concentration of the caustic alkali ranges from 2 to 20 weight percent, preferably from 3 to 10 weight percent. Following the treatment with the alkali, the system is washed with an acid with a pH of 3 to 7 to remove the alkali liquid. The resultant lignite has less than 4 meq/g, for instance 2.60 to 3.50 meq/g, of sodium ions and exhibits abilities of ion exchange. By treating the alkali treated lignite with hydrochloric acid or sulfuric acid it is possible to retain hydrogen ions, and by using a solution of a calcium salt such as calcium chloride calcium ions can be retained. Thus, calcium ions or potassium ions may be exchanged with cations of a salt of metal of Group second in the periodic table such as calcium, magnesium, barium and zinc.

REFERENCES:
patent: 2312449 (1943-03-01), Shoemaker
patent: 2693452 (1954-11-01), Goedkoop

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