Abstract:
Proposed is a method for purifying a recycle stream (1) from a system for producing polyarylene ether sulfones by the polycondensation of aromatic bis-halogen compounds and aromatic bisphenols or salts thereof in the presence of at least one alkali metal- or ammonium carbonate or -hydrogen carbonate in an N-alkyl-2-pyrrolidone as a solvent, containing 60 to 90% by weight water, 10 to 40% by weight N-alkyl-2-pyrrolidone and, as a specification-detrimental impurity, up to 5000 ppm by weight of the alkyl succinimide corresponding to the N-alkyl-2-pyrrolidone and, in addition, up to 1000 ppm by weight additional high boilers relative to N-alkyl-2-pyrrolidone, in particular inorganic salts, each relative to the total weight of the recycle stream (1), the sum of the components being 100% by weight, to obtain a purified N-alkyl-2-pyrrolidone stream (2) that can be fed back into the system for producing polyarylene ether sulfones by purification by distillation in a purification column (K). Said method is characterized in that a prepurification step by evaporation in one or more evaporator stages is provided upstream of the purification by distillation in order to reduce the content of inorganic salts, one or more vapor streams (3, 4, 5) being obtained which are fed to the purification column (K) as feed streams. The bottom stream is discharged from the last evaporator stage and the bottom stream from the purification column (K) is entirely recycled into the last evaporator stage. The vapor stream (5) from the last evaporator stage is partially or entirely fed to an additional column (ZK) from which a top stream is removed, which is is fed to the purification column (K), and a bottom stream, which is discharged.
Abstract:
Porposed is a method for purifying a recycle stream (1) from a system for producing polyarylene ether sulfones by the polycondensation of aromatic bis-halogen compounds and aromatic bisphenols or salts thereof in the presence of at least one alkali metal- or ammonium carbonate or -hydrogen carbonate in an N-alkyl-2-pyrrolidone as a solvent, containing - 60 to 90% by weight water, -10 to 40% by weight N-alkyl-2-pyrrolidone and, as a specification-detrimental impurity, up to 5000 ppm by weight of the alkyl succinimide corresponding to the N-alkyl-2-pyrrolidone and, in addition, up to 1000 ppm by weight additional high boilers relative to N-alkyl-2-pyrrolidone, in particular inorganic salts, each relative to the total weight of the recycle stream (1), the sum of the components being 100% by weight, to obtain a purified N-alkyl-2-pyrrolidone stream (2) that can be fed back into the system for producing polyarylene ether sulfones by purification by distillation in a purification column (K) which is characterized in that a prepurification step by evaporation in one or more evaporator stages is provided upstream of the purification by distillation in order to reduce the content of inorganic salts, wherein one or more vapor streams (3, 4, 5) are obtained which are fed to the purification column (K) as feed streams, and wherein the bottom stream is discharged from the last evaporator stage and the bottom stream from the purification column (K) is partially or entirely fed to an additional column (ZK) and is divided therein into a bottom stream (11) that is discharged and a top stream (12) that is recycled into the purification column (K).
Abstract:
Proposed is a method for purifying a recycle stream (1) from a system for producing polyarylene ether sulfones by the polycondensation of aromatic bis-halogen compounds and aromatic bisphenols or salts thereof in the presence of at least one alkali metal- or ammonium carbonate or -hydrogen carbonate in an N-alkyl-2-pyrrolidone as a solvent, containing - 60 to 90% by weight water, - 10 to 40% by weight N-alkyl-2-pyrrolidone and, as a specification-detrimental impurity, up to 5000 ppm by weight of the alkyl succinimide corresponding to the N-alkyl-2-pyrrolidone and, in addition, up to 1000 ppm by weight additional high boilers relative to N-alkyl-2-pyrrolidone, in particular inorganic salts, each relative to the total weight of the recycle stream (1), the sum of the components being 100% by weight, to obtain a pure N-alkyl-2-pyrrolidone stream (2) that can be fed back into the system for producing polyarylene ether sulfones by purification by distillation which is characterized in that the purification by distillation is carried out in a dividing wall column (TK) that has a dividing wall (T) which is arranged in the longitudinal direction of the column and which divides the inner space of the dividing wall column (TK) into a supply region (A), a discharge region (B), an upper common column region (C) and a lower common column region (D), the recycle stream (1) being fed to the supply region (A) of said dividing wall column and divided in the dividing wall column (TK) into a bottom stream (7) containing N-methyl succinimide, a top stream (8) containing water and a pure NMP stream as a side stream (2) from the discharge region (B).
Abstract:
Procedimiento para la preparación de polímeros de polibifenilsulfona que comprende (a) el suministro de los componentes (a1) consistente en por lo menos un compuesto aromático dihidroxilado y (a2) consistente en por lo menos un compuesto aromático de sulfona con dos sustituyentes halógeno, en el que el componente (a1) comprende 4,4'-dihidroxibifenilo y a continuación (b) la reacción del componente (a2) con un exceso molar del componente (a1) en un solvente, usando carbonatos de metal alcalino como base, en el que después de la reacción se añade agua y/o un hidróxido metálico.
Abstract:
The invention relates to a method for preparing polyarylethersulfone-polyalkylene oxide block copolymers (PPC) comprising the polycondensation of a reaction mixture (RG) comprising the components: (A1) at least one aromatic dihalogen compound, (B1) at least one aromatic dihydroxyl compound, (B2) at least one polyalkylene oxide having at least two hydroxyl groups, (C) at least one aprotic polar solvent and (D) at least one metal carbonate, where the reaction mixture (RG) does not comprise any substance which forms an azeotrope with water.
Abstract:
Block copolymer comprising polyarylene ether blocks and polyalkylene oxide blocks, wherein said block copolymer comprises at least two polyalkylene oxide blocks that are endcapped with different endcapping groups.
Abstract:
The invention relates to a method for purifying a recycling flow (1) from a plant for producing polyarylene ether sulfones by polycondensing aromatic bis-halogen compounds and aromatic bisphenols or salts thereof in the presence of at least one alkali-metal carbonate or hydrogencarbonate or ammonium carbonate or hydrogencarbonate in an N-alkyl-2-pyrrolidone as a solvent, containing 60 to 90 wt% of water, 10 to 40 wt% of N-alkyl-2-pyrrolidone, and, as a specification-impairing contaminant, up to 5000 ppm by weight of the alkyl succinimide corresponding to the N-alkyl-2-pyrrolidone and in addition thereto up to 1000 ppm by weight of additional high boilers in relation to N-alkyl-2-pyrrolidone, in particular inorganic salts, in each case with respect to the total weight of the recycling flow (1), the sum of the components equaling 100 wt%, so as to obtain a pure N-alkyl-2-pyrrolidone flow (2), which can be fed back into the plant for producing polyarylene ether sulfones, by means of purification by distillation in a purification column (K), the method being characterized in that a pre-purification by evaporation in one or more evaporator stages in order to reduce the content of inorganic salts is performed before the purification by distillation, one or more vapor flows (3, 4, 5) being obtained, which are fed to the purification column (K) as feed flows, and the bottom flow from the last evaporator stage being discharged and the bottom flow from the purification column (K) being completely recycled into the last evaporator stage.
Abstract:
Proposed is a method for purifying a recycle stream (1) from a system for producing polyarylene ether sulfones by the polycondensation of aromatic bis-halogen compounds and aromatic bisphenols or salts thereof in the presence of at least one alkali metal- or ammonium carbonate or -hydrogen carbonate in an N-alkyl-2-pyrrolidone as a solvent, containing - 60 to 90% by weight water, - 10 to 40% by weight N-alkyl-2-pyrrolidone and, as a specification-detrimental impurity, up to 5000 ppm by weight of the alkyl succinimide corresponding to the N-alkyl-2-pyrrolidone and, in addition, up to 1000 ppm by weight additional high boilers relative to N-alkyl-2-pyrrolidone, in particular inorganic salts, each relative to the total weight of the recycle stream, the sum of the components being 100% by weight, to obtain a purified N-alkyl-2-pyrrolidone stream (2) that can be fed back into the system for producing polyarylene ether sulfones by purification by distillation in a purification column (K) which is characterized in that a prepurification step by evaporation in one or more evaporator stages is provided upstream of the purification by distillation in order to reduce the content of inorganic salts, wherein one or more vapor streams (3, 4, 5) are obtained which are fed to the purification column (K) as feed streams, and wherein the bottom stream is discharged from the last evaporator stage and wherein a partial stream (9) comprising 1.0% by weight up to 10% by weight of the bottom stream (7) is discharged from the purification column (K) and the bottom stream from the purification column (K) is recycled into the last evaporator stage.
Abstract:
Copolímero en bloque que comprende bloques de poliarileno éter y bloques de óxido de polialquileno, en el que dicho copolímero en bloque comprende al menos dos bloques de óxido de polialquileno que están cubiertos en los extremos con diferentes grupos cobertores de extremos.