摘要:
Granular poly(arylene sulfide) is recovered from a slurry comprising granular poly(arylene sulfide), polar organic solvent, alkali metal halide, poly(arylene sulfide) oligomers, untreated reactants in the water by heating the slurry under conditions to evaporate polar organic solvent, water and volatile impurities at a temperature below the normal boiling point of the polar organic solvent to produce a dry mixture containing poly(arylene sulfide), poly(arylene sulfide) oligomers and alkali metal halide which is then reslurried with water to produce a reslurried mixture containing aqueous alkali metal halide solution and dispersed poly(arylene sulfide) oligomers with the reslurried mixture being filtered through a coarse screen to recover granular poly(arylene sulfide) thereon and pass a filtrate containing poly(arylene sulfide) oligomers and aqueous alkali metal halide solution therethrough. The filtrate can be further treated by filtering through a filter aid coated vacuum filter to recover poly(arylene sulfide) oligomers thereon and pass an aqueous alkali metal halide solution therethrough as filtrate.
摘要:
A method for producing a polymer in which lithium hydroxide, optionally also employing either lithium chloride or lithium acetate, is contacted with N-methyl-pyrrolidone in the presence of lithium halide to produce a reaction product mixture containing lithium N-methyl-4-aminobutyrate with this reaction mixture then being contacted with hydrogen sulfide and polyhalo aromatic compound in the presence of additional N-methyl-pyrrolidone under conditions to form a polymer. Lithium halide produced as a by-product is substantially recovered from the reaction mixture, converted to lithium hydroxide and can be recycled to the process.
摘要:
Arylene sulfide polymers containing ash-forming impurities or materials are purified by contacting an aqueous mixture of such polymer with molecular oxygen under conditions sufficient to reduce the ash-forming impurities and concurrently at least partially cure the polymer.
摘要:
A process for treating a hydrocarbon composition containing both straight chain and non-straight chain hydrocarbons in which said hydrocarbon composition is separated into a straight chain hydrocarbon-rich fraction and a non-straight chain hydrocarbon-rich fraction, non-aromatics in said non-straight chain hydrocarbon-rich fraction are converted to aromatics, and at least a portion of the straight chain hydrocarbon-rich fraction is passed in combination with steam over a steam active catalyst comprising at least one Group VIII metal and a tin modified Group II metal aluminate under conditions such that aromatics are produced.
摘要:
Virgin poly(arylene sulfide) resins are oxidatively cured by heat treatment at an elevated temperature below the melting point of the resin, under an oxidizing atmosphere comprising less than a 20 volume % oxygen concentration. The resulting polymer exhibits drastically improved thermal stability with no apparent sacrifice in physical properties.
摘要:
Method and apparatus for the separation of solid particulate polymer from liquid diluent comprising the use of one or more accumulator legs to which diluent is supplied, and separated diluent is recycled to the polymerization process.
摘要:
A process for producing alkali metal aminobutyrate or alkali metal aminobutyrate-alkali metal bisulfide complex by contacting an aqueous alkali metal hydroxide with NMP and optionally alkali metal bisulfide in a stirred reactor under reaction conditions to produce a predominantly one-phase system and maintaining these reaction conditions while passing the one-phase system through a disrupted flow tube reactor to complete the reaction. Dehydrating the reaction product in a two-stage dehydration process using a higher temperature in the second stage.
摘要:
An improved polymerization process wherein vapors from a flash zone are condensed and used as wash liquid in a polymer washing zone and optionally a sidestream from a monomer fractionation zone is also used as wash liquid.
摘要:
A novel process is disclosed for separating liquid diluent from a slurry of the diluent and a solid polymer involving the use of a first intermediate pressure flash zone and a second lower pressure flash zone.
摘要:
A process is provided for removing solid and liquid impurities from a particulate arylene sulfide polymer recovered from a polymerization reaction mixture slurry, without significantly discoloring the resulting washed polymer. The process of this invention comprises the steps of: (a) preparing a first slurry, wherein the solid component thereof comprises a particulate arylene sulfide polymer recovered from a reaction mixture slurry, and wherein the liquid component thereof comprises a mixture of water and a reducing agent; (b) heating the first slurry to a temperature of at least about 185.degree. C. (365.degree. F.) but below the melting point of the particulate polymer, to wash the polymer contained therein; (c) cooling the first slurry to a temperature below about 100.degree. C. (212.degree. F.), to form a second slurry, wherein the solid component thereof comprises a washed particulate arylene sulfide polymer; and (d) recovering the washed particulate arylene sulfide polymer from the second slurry.