Method for producing polyarylene sulfide, dehydration method, and device for producing polyarylene sulfide
AssigneeKureha Corporation
InventorsKenji Suzuki, Hiroshi Sakabe, Michihisa Miyahara
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Abstract
A method of producing a PAS according to an embodiment of the present invention includes: a polymerizing step; a water removal step; a hydrogen sulfide recovering step in which hydrogen sulfide contained in a gas component produced in the water removal step is absorbed and recovered by an aqueous solution of an alkali metal hydroxide; and a condensation step in which the gas component produced in the water removal step is condensed. The hydrogen sulfide recovering step is performed before the condensation step.
Claims14
A method of producing a polyarylene sulfide, the method comprising:
- a polymerizing step in which at least one sulfur source selected from an alkali metal sulfide, an alkali metal hydrosulfide, and hydrogen sulfide and a dihalo aromatic compound are polymerized in an organic polar solvent,
- wherein the sulfur source is supplied as a raw material mixture containing water,
- the method further comprises:
- a water removal step in which the raw material mixture is heated to remove water;
- a hydrogen sulfide recovering step in which hydrogen sulfide contained in a gas component produced in the water removal step is absorbed by an aqueous solution of an alkali metal hydroxide to obtain a recovered liquid;
- and
- a condensation step in which the gas component produced in the water removal step is condensed, and
- the hydrogen sulfide recovering step is performed before the condensation step.
A water removal treatment method for a raw material mixture used in production of a polyarylene sulfide, the method comprising:
- a water removal step in which a raw material mixture containing at least one sulfur source selected from an alkali metal sulfide, an alkali metal hydrosulfide, and hydrogen sulfide, and water is heated to remove water;
- a hydrogen sulfide recovering step in which hydrogen sulfide contained in a gas component produced in the water removal step is absorbed by an aqueous solution of an alkali metal hydroxide to obtain a recovered liquid;
- and
- a condensation step in which the gas component produced in the water removal step is condensed,
- wherein the hydrogen sulfide recovering step is performed before the condensation step.
A polyarylene sulfide production apparatus comprising:
- a polymerization unit for polymerizing at least one sulfur source selected from an alkali metal sulfide, an alkali metal hydrosulfide, and hydrogen sulfide and a dihalo aromatic compound in an organic polar solvent,
- a water removing unit for heating a raw material mixture containing at least one sulfur source selected from an alkali metal sulfide, an alkali metal hydrosulfide, and hydrogen sulfide, and water to remove water;
- a hydrogen sulfide recovery unit for absorbing and recovering hydrogen sulfide contained in a gas component produced in the water removing unit by an aqueous solution of an alkali metal hydroxide;
- and
- a condensing unit for condensing a gas component from which hydrogen sulfide has been recovered by the hydrogen sulfide recovery unit,
- wherein the hydrogen sulfide recovery unit is provided on an upstream side of the condensing unit.
Dependencies are inferred from the claim text.