Mixed salt suspension polymerization process and resins and catalysts produced thereof
View Patent ↗This invention relates to no-salt and mixed salt suspension polymerization processes for water-soluble monomers and resins and relates to catalysts produced from the same.
1. A process for preparing a resin by suspension polymerization comprising:
i) forming an aqueous suspension, wherein the aqueous suspension comprises an aqueous phase and an organic phase, wherein the organic phase comprises:
a) a monomer phase;
b) from 0.1 to 5 weight percent of a polymerization initiator; and
wherein the monomer phase comprises at least 50 weight percent of vinyl pyridine and from 0.1 to 50 weight percent of divinylbenzene;
ii) establishing polymerization conditions in the suspension,
iii) allowing the monomers to polymerize until they have formed water-insoluble particles, and
iv) separating the particles from the aqueous phase;
further wherein the aqueous phase comprises water and also comprises a mixture comprising from about 1 to about 2.5 weight percent sodium nitrite and about 5 weight percent sodium bicarbonate, based on the water in the aqueous phase.
2. The process of claim 1 wherein the suspending agent is poly (diallyl dimethyl ammonium chloride) or gelatin.