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US 7,745,567 B2Granted
Process for stripping polymer dispersions
AssigneeRohm and Haas Company
InventorsJames Kent Carpenter, Adam Loyack
Life of this patent
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Abstract
A process for continuously stripping a polymer dispersion comprising a heat exchanger with minimal internal obstructions for the stripper. The process is particularly adapted to dispersions that are heat and shear sensitive. The process is able to extract hydrophobic VOC's more efficiently than a single, jacketed tube design.
Claims7
A process for continuously stripping polymer dispersions with volatile substances comprising:
- providing a polymer dispersion and steam wherein the dispersion comprises aqueous emulsion polymer and volatile organic compounds;
- feeding the polymer dispersion and steam into a stripper;
- removing at least a portion of the volatile organic compounds from the dispersion;
- transferring the portion of the volatile organic compounds to the steam;
- and
- separating the steam from the aqueous emulsion polymer in a separator vessel
- wherein the stripper:
- (a) has a ratio of surface area to volume of at least 10:1 l/m;
- (b) further comprises a vacuum wherein the pressure in the vacuum ranges from 100 to 40,000 Pa;
- and
- (c) is comprised of one or more heat exchangers wherein the heat exchanger is a shell and tube heat exchanger or a spiral heat exchanger.
8 more elements
Dependencies are inferred from the claim text.