Gel-type chelating resins and a process for removal of multi-val

Details Gel-type chelating resins and a process for removal of multi-val Gel-type chelating resins and a process for removal of multi-val

1988-02-08

1990-01-23

Lilling, Herbert J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

521 32, 525242, 5253335, 5253336, 525902, 423 22, 423 24, 423 89, 423 99, C08F25702, C08F11208, C08F 840

Patent

active

048959057

ABSTRACT:
Improved processes for the removal from solution of multi-valent alkaline earth metal and/or heavy metal cations are taught, having excellent combinations of cation capacity and resistance to bead breakage. The processes use specified polymer resin beads functionalized with chelating functionalities such as alkylaminophosphonic moieties or iminodiacetic acid moieties. The beads are prepared by the specified process to have a decreased amount of cross-linking in the shell area as compared to the core. An additional aspect of the invention is an improved gel-type chelating resin having core/shell morphology and alkylaminophosphonic functional groups which is found to exhibit surprising combinations of dynamic capacity, osmotic shock resistance, and physical strength. This chelating resin has been found to be very suitable for the removal of calcium from brine solutions prior to the use of such solutions in membrane electrolysis cells of chlorine production.

REFERENCES:
patent: 4002564 (1977-01-01), Carbonel et al.
patent: 4442237 (1984-04-01), Zimmerman et al.
patent: 4564644 (1986-01-01), Harris
patent: 4797187 (1989-01-01), Davis et al.
patent: 4818773 (1989-04-01), Cornette et al.
Derwent Abs. 87-136947/20 Obrecht et al, DE3540143.

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