Edward I Wolfe

US Patent:

45955085, Jun 17, 1986

Filed:

May 7, 1984

Appl. No.:

6/607664

Inventors:

Edward I. Wolfe - Whippany NJ
David H. Wasserstrom - Whippany NJ
Richard Kilpert - Berkeley Heights NJ

Assignee:

Exxon Research and Engineering Co. - Florham Park NJ

International Classification:

C02F 142

US Classification:

210631

Abstract:

Industrial wastewater is contacted with a weak acid cation exchange resin, in the hydrogen ion form, to substantially reduce the sodium and ammonium alkalinity levels rendering the wastewater suitable, for example, as an environmentally acceptable cooling medium.

US Patent:

41637178, Aug 7, 1979

Filed:

Dec 15, 1977

Appl. No.:

5/860690

Inventors:

Roger A. Blind - Morristown NJ
Robert T. Saterbak - Baytown TX
Edward I. Wolfe - Whippany NJ

Assignee:

Exxon Research & Engineering Co. - Florham Park NJ

International Classification:

C02B 170

US Classification:

210 31R

Abstract:

Silica can be removed effectively from a mixed bed demineralizer containing an anion exchange resin and a cation exchange resin during regeneration by (1) passing from about 30 to about 80 volume % of an anion regenerant solution through only the anion exchange resin, (2) passing the remaining portion of the anion regenerant solution through both the anion exchange resin and the cation exchange resin, and (3) passing a stream of cation regenerant solution through the cation exchange resin. When the anion and cation exchange resins are regenerated according to this procedure, the amount of silica on the resins is reduced such that when silica containing water is passed through the demineralizer during normal operations, the concentration of silica in the treated water as SiO. sub. 2 will be less than 0. 1, most preferably less than 0.