Process for manufacturing polyarylene sulfide
AssigneeIdemitsu Petrochemical Co., Ltd.
InventorsYoshinari Koyama, Norio Ogata, Hiroshi Nishitani
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Abstract
A process for efficiently manufacturing high purity polyarylene sulfide. The process comprises feeding a liquid or gaseous sulfur compound (e.g. hydrogen sulfide) to a mixture comprising lithium hydroxide and a non-lithium hydroxide solid compound (e.g. alkali metal chloride or alkaline earth metal chloride) in a non-protonic organic solvent (e.g. N-methyl-2-pyrrolidone), separating the alkali metal chloride or alkaline earth metal chloride, adjusting the sulfur content of the reaction mixture, feeding a dihalogeno aromatic compound e.g. p-dichlorobenzene) to effect a polycondensation reaction, and adding of an alkali metal hydroxide (e.g. sodium hydroxide) to recover lithium ion.
Claims11
A process for manufacturing polyarylene sulfide comprising:
- (a) feeding a liquid or gaseous sulfur compound to a mixture comprising lithium hydroxide and a solid selected from the group consisting of an alkaline metal chloride selected from the group consisting of sodium chloride and potassium chloride, and an alkaline earth metal chloride in a non-protic organic solvent, and directly reacting lithium hydroxide and said sulfur compound,
- (b) separating said solid selected from the group consisting of an alkaline metal chloride selected from the group consisting of sodium chloride and potassium chloride, and an alkaline earth metal chloride,
- (c) adjusting the sulfur content of the reaction mixture,
- (d) feeding a dihalogeno aromatic compound to effect a polycondensation reaction, and
- (e) feeding an alkali metal hydroxide other than lithium hydroxide or an alkaline earth metal hydroxide to the reaction mixture which contains by-produced lithium chloride and reacting lithium ion and hydroxy ion to recover lithium ion as lithium hydroxide which is the reaction product.
A process for manufacturing polyarylene sulfide comprising,
- (a) feeding a liquid or gaseous sulfur compound to a system comprising lithium hydroxide or lithium N-methylaminobutyrate in a non-protic organic solvent,
- (b) dehydrating the reaction mixture, and
- (c) adjusting the sulfur content of the reaction mixture and feeding a dihalogeno aromatic compound to effect a polycondensation reaction,
- wherein said dehydration is effected after the addition of said sulfur compound and before addition of said dihalogeno aromatic compound.
In the method of separating a solid selected from the group consisting of an alkaline metal chloride selected from the group consisting of sodium chloride and potassium chloride, and an alkaline earth metal chloride, from a mixture comprising lithium hydroxide and a solid selected from the group consisting of an alkaline metal chloride selected from the group consisting of sodium chloride and potassium chloride, and an alkaline earth metal chloride in a non-protic organic solvent, a method characterized by feeding a liquid or gaseous sulfur compound to said mixture to react lithium hydroxide directly with said sulfur compound.
A process for recovering lithium ion from a reaction mixture of polyarylene sulfide containing lithium chloride after removing polyarylene sulfide comprising,
- feeding an alkali metal hydroxide to said reaction mixture of polyarylene sulfide containing lithium chloride,
- reacting lithium ion and hydroxy ion, and
- recovering the lithium ion as lithium hydroxide which is the reaction product.
A process for manufacturing polyarylene sulfide comprising:
- (a) preparing a polyarylene sulfide by reacting lithium hydroxide or lithium N-methylaminobutyrate, a sulfur compound, and a dihaloaromatic compound in a non-protic solvent;
- (b) removing said polyarylene sulfide;
- (c) feeding an alkali metal hydroxide other than lithium hydroxide or an alkaline earth metal hydroxide to reaction by-products comprising lithium chloride and reacting lithium ion and hydroxy ion to recover lithium ion as lithium hydroxide
- (d) feeding a liquid or gaseous sulfur compound to a mixture comprising lithium hydroxide and a solid selected from the group consisting of an alkaline metal chloride selected from the group consisting of sodium chloride and potassium chloride, and an alkaline earth metal chloride in a non-protic organic solvent, and directly reacting lithium hydroxide and said sulfur compound,
- (e) removing said solid selected from the group consisting of an alkaline metal chloride selected from the group consisting of sodium chloride and potassium chloride, and an alkaline earth metal chloride,
- (f) adjusting the sulfur content of the reaction mixture,
- (g) feeding a dihalogeno aromatic compound to effect a polycondensation reaction, and
- (h) returning to step (b).
Dependencies are inferred from the claim text.