Continuous dehydration method and method for producing polyarylene sulfide

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United States of America Patent

PATENT NO 11155682
SERIAL NO

17270735

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The continuous dehydration method for a raw material mixture to be used in the production of PAS includes supply and dehydration of the raw material mixture and extraction of the raw material mixture having a water content reduced by the dehydration, the supply, dehydration and extraction being carried out concurrently in parallel. A dehydration efficiency index determined according to Equation (1) is not less than 0.3. In Equation (1), the dehydration time is a period of time until a moisture content per mole of the sulfur source in the raw material mixture having a reduced water content reaches not greater than 1.7 mol, including moisture consumed by the hydrolysis of the organic polar solvent.

description='In-line Formulae' end='lead'Dehydration efficiency index=[Number of moles (mol) of the sulfur source in the raw material mixture having a reduced water content]/[Dehydration time (hr)×(Total internal volume (L) of the dehydration tanks)2/3]  (1)description='In-line Formulae' end='tail'

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Patent Owner(s)

  • KUREHA CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Miyahara, Michihisa Tokyo, JP 30 170
Sakabe, Hiroshi Tokyo, JP 34 131
Suzuki, Kenji Tokyo, JP 999 10843

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