Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-01-19
1977-12-20
Marquis, Melvyn I.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 79, C08G 7516
Patent
active
040641147
ABSTRACT:
A method is provided for producing arylene sulfide polymers employing a p-dihalobenzene, an alkali metal sulfide, lithium acetate, an N-alkyl-2-pyrrolidone, and optionally a polyhalo aromatic compound having more than two halogen substituents per molecule, preferably with the addition of a base selected from alkali metal hydroxides and alkali metal carbonates at polymerization conditions. A first composition comprising N-alkyl-2-pyrrolidone, lithium acetate and water is prepared and subjected to dehydration conditions after which a composition containing at least 50 weight percent water, an alkali metal sulfide and preferably containing a base is added to the first dehydrated composition and a second dehydration performed. A composition resulting from the second dehydration is then contacted with a p-dihalobenzene, and optionally a polyhalo aromatic compound having more than two halogen substituents per molecule, at polymerization conditions to form arylene sulfide polymers of higher molecular weight than produced without the two-step dehydration. The two-step dehydration also results in less foaming and flooding of the distillation column as compared with the process using a single dehydration.
REFERENCES:
patent: 3354129 (1967-11-01), Edmonds, Jr. et al.
patent: 3562199 (1971-02-01), Hill, Jr. et al
patent: 3607843 (1971-09-01), Vidaurri, Jr.
patent: 3763124 (1973-10-01), Edmonds, Jr.
patent: 3786035 (1974-01-01), Scoggin
patent: 3876591 (1975-04-01), Campbell
patent: 3898204 (1975-08-01), Short et al.
patent: 3919177 (1975-11-01), Campbell
Marquis Melvyn I.
Phillips Petroleum Company
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