Elevated, declining pressure dehydration of poly(arylene...

Details Elevated, declining pressure dehydration of poly(arylene... Elevated, declining pressure dehydration of poly(arylene...

C - Chemistry, Metallurgy

08

G

400/109, 402/343

C08G 75/14 (2006.01) C08G 75/02 (2006.01) F16L 5/00 (2006.01)

Patent

CA 1182247

Abstract of the Disclosure A method for dehydrating pre-polymerization mixtures in the preparation of poly(arylene sulfide) in which a reaction mixture of a sulfur source and an organic amide are contacted at a first pressure within a range of about 20 psig to about 60 psig and an initial temperature in a range of about 300°F to 400°F to form a complex of the reactants with the mixture subsequently subjected to a decrease in pressure while elevating the temperature to a second temperature at which, at the chosen pressure, essentially all water is removed from the mixture. Other compounds including bases, alkali metal carboxylates, alkali metal carbonates, lithium halides, and lithium borate can be present in the reaction mixture. Preferably the sulfur source is sodium sulfide and the organic amide is N-methylpyrrolidone

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