Alkylaminophosphonic chelating resins, their preparation and use

Details Alkylaminophosphonic chelating resins, their preparation and use Alkylaminophosphonic chelating resins, their preparation and use

1984-11-15

1989-04-04

Schofer, Joseph L.

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

Synthetic resins

Ion-exchange polymer or process of preparing

521 31, C08D 520

Patent

active

048187739

ABSTRACT:
New macroporous alkylaminophosphonic chelating resins which exhibit excellent mechanical stability and strength and good chemical stability are characterized by having an apparent density of 0.35 to 0.425 g/ml, a granulometry smaller than 0.8 mm, a water retention of 50 to 60 percent in the acid form, a porosity of 800 to 1100 mm.sup.3 g, a total theoretical capacity for the fixation of calcium ions of not greater than 31 g/l of resin in the sodium form and an osmotic resistance such that more than 90 percent of the beads are intact after 30 shocks. The high resistance to osmotic shock combined with an adequate exchange capacity exhibited by the new resins makes them particularly suitable for use in highly concentrated solutions, such as concentrated electrolytic brines.
A simple, effective, and economical procedure is described which makes it possible to eliminate, in the form of complexed cations, the impurities contained in the brines used for the electrolytic production of chlorine or alkali metals in membrane cells or diaphragm cells and for the electrolytic production of chlorates.

REFERENCES:
patent: 4002564 (1977-01-01), Carbonel et al.
patent: 4176022 (1979-11-01), Parlington
patent: 4442231 (1984-04-01), Kataopa et al.
Polymer Science U.S.S.R. vol. 15, No. 6, 1974, Davankov et al., pp. 1349-1362.
Chem. Abstract vol. 80, 1974, entry 83990.

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