Phase separation processes

Details Phase separation processes Phase separation processes

C - Chemistry, Metallurgy

08

F

402/398, 402/6

C08F 6/12 (2006.01) C08F 6/00 (2006.01)

Patent

CA 1252598

Abstract of the Disclosure A separation process has been found in which a polymer-solvent solution separates into phases of highly different composition which are in equilibrium over a broad temperature range. Upon addition of the phase sepa- rating agent, which is near or above its supercritical con- ditions, rapid disengagement into two phases occurs. The relative volume of solvent rich phase is substantially lar- ger than the polymer rich phase. The process can be prac- ticed at relatively low temperatures such as those em- ployed in polymerization or post-polymerization processes. The separation is accomplished by adding or elevating the concentration of a phase separation agent to or above a minimum effective concentration, which causes the UCST and LCST lines to merge. Suitable phase separating agents are organic and inorganic compounds that are gases at 1 atm pressure and 25°C. Due to the gaseous nature of the phase separating agent, it is easily removed from the solvent phase for reuse in the process.

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