Abstract: The invention relates to a method for pyrolysis of polycarbonate-containing material in order to recover raw materials. The method comprises: (a) introducing material intended for the pyrolysis, at least comprising a polycarbonate-containing compound and an entire amount of phosphorous, organic compound, into a reactor, the entire amount relative to the entire weight of the material intended for pyrolysis having a ratio of at least 0.01 wt. % phosphor with a formal oxidation number of +5; (b) decomposing, at a temperature of 300° C. to 700° C., at least the material intended for pyrolysis introduced into the reactor in step (a) and obtaining a product that is present in the gaseous phase as the pyrolysate and of pyrolysis residues that are present in a non-gaseous phase; (c) cooling the removed pyrolysate to a temperature of less than 300° C. while obtaining a pyrolysis product, selected from pyrolysis condensate, pyrolysis sublimate or a mixture thereof.

Abstract: The invention relates to a process for recovery of rubber-modified vinyl(co)polymer from a polycarbonate resin or an optionally shredded molded part made thereof and the use of the recovered rubber-modified vinyl(co)polymer for the production of molded parts as well as blend partner in polycarbonate blends. Further optional aspects are the recovery of aromatic and/or aliphatic diol and the use of this diol for the production of polycarbonates.

Abstract: A method for pyrolysis of polycarbonate-containing material in order to recover raw materials is provided. The method comprises at least the following steps: (a) introducing material intended for the pyrolysis, at least comprising material that contains a mixture of a polycarbonate-containing compound and a polystyrene-containing compound, into a reactor; (b) decomposing, at a temperature of 300° C. to 700° C., at least the material intended for pyrolysis introduced into the reactor in step (a) and obtaining a product that is present in the gaseous phase as the pyrolysate and of pyrolysis residues that are present in a non-gaseous phase; and (c) cooling the removed pyrolysate to a temperature of less than 300° C. while obtaining a pyrolysis product, selected from pyrolysis condensate, pyrolysis sublimate or a mixture thereof.

Abstract: The present invention relates to a process for preparing bisphenol A in the presence of cumene without poisoning the catalyst system comprising an ion exchange resin catalyst and a sulfur containing cocatalyst. Moreover, the present invention provides a process for preparing polycarbonate.

Abstract: The present invention relates to a process for preparing bisphenol A in the presence of acetophenone without poisoning the catalyst system comprising an ion exchange resin catalyst and a sulfur containing cocatalyst. Moreover, the present invention provides a process for preparing polycarbonate.

Abstract: The present invention relates to a process for preparing bisphenol A in the presence of benzene without poisoning the catalyst system comprising an ion exchange resin catalyst and a sulfur containing cocatalyst. Moreover, the present invention provides a process for preparing polycarbonate.

Abstract: The present invention relates to a process for preparing bisphenol A in the presence of 2-methyl benzofuran without poisoning the catalyst system comprising an ion exchange resin catalyst and a sulfur containing cocatalyst, wherein at least part of the sulfur containing cocatalyst is neither covalently nor ionically bound to the ion exchange resin catalyst. Moreover, the present invention provides a process for preparing polycarbonate.

Abstract: The present invention relates to a process for preparing bisphenol A in the presence of alpha-methylstyrene without poisoning the catalyst system comprising an ion exchange resin catalyst and a sulfur containing cocatalyst. Moreover, the present invention provides a process for preparing polycarbonate.

Abstract: The present invention relates to a process for preparing bisphenol A in the presence of at least two impurities being selected from the group consisting of 2-methylbenzofurane, hydroxyacetone, alpha-methylstyrene, acetophenone, benzene and/or cumene without poisoning the catalyst system comprising an ion exchange resin catalyst and a sulfur containing cocatalyst, wherein at least part of the sulfur containing cocatalyst is not chemically bound to the ion exchange resin catalyst. Moreover, the present invention provides a process for preparing polycarbonate.

Abstract: The invention relates to a method for producing a specific hydroxyl compound by decarboxylating a specific carboxylic acid compound or a salt of said carboxylic acid compound in the absence of a catalyst and to a method for producing a bisphenol.

Abstract: The present invention relates to a process for preparing bisphenol A in the presence of hydroxyacetone without poisoning the catalyst system comprising an ion exchange resin catalyst and a sulfur containing cocatalyst, wherein at least part of the sulfur containing cocatalyst is not chemically bound to the ion exchange resin catalyst. Moreover, the present invention provides a process for preparing polycarbonate and a composition comprising bisphenol A and at least one specific impurity which is formed in the production of bisphenol A.

Abstract: The invention relates to a method for producing a specific hydroxy compound by decarboxylating a specific carboxylic acid compound or a salt of said carboxylic acid compound in the presence of a Bronsted base. The invention also relates to a method for producing a diaryl carbonate or a bisphenol, to a method for producing a polycarbonate and to a use of a Bronsted base during the reaction of the decarboxylation of a specific carboxylic acid compound or a salt of said carboxylic acid compound.

Abstract: The invention relates to a method for producing a specific hydroxyl compound by decarboxylating a specific carboxylic acid compound or a salt of said carboxylic acid compound in the absence of a catalyst and to a method for producing a bisphenol.

Abstract: The present invention relates to the preparation of 3,3,5-trimethylcyclohexylidene bisphenol (BP-TMC). Especially, the present invention relates to the preparation of 3,3,5-trimethylcyclohexylidene bisphenol (BP-TMC) from 3,3,5-trimethylcyclohexanone (TMC-one) and phenol in the presence of a gaseous acidic catalyst. The preparation is preferably conducted continuously. It is an object of the present invention to prevent that solids, especially crystallized BP-TMC, more especially crystallized BP-TMC-phenol-adduct, block the outlet of the dosing valve for the gaseous acidic acid when the gaseous acidic acid is dosed into the reaction mixture comprising TMC-one and phenol in a reaction vessel.

Abstract: The present invention relates to a process for producing a polycarbonate from a diphenol or two or more different diphenols and a carbonyl halide by the interfacial process. It is a feature of the process according to the invention that it is carried out on the basis of a chlorohydrocarbon or a mixture of a mixture of two or more chlorohydrocarbons using an organic solvent. An organic solvent is also provided.

Abstract: The present invention relates to a process for producing a polycarbonate from a diphenol or two or more different diphenols and a carbonyl halide by the interfacial process. It is a feature of the process according to the invention that it is carried out on the basis of a chlorohydrocarbon or a mixture of a mixture of two or more chlorohydrocarbons using an organic solvent. An organic solvent is also provided.

Abstract: The present invention relates to a melt transesterification process for the production of (co)polycarbonates from diaryl carbonates and cycloalkylidene diphenols, which process comprises the addition of a monohydroxyaryl compound in an amount of 5.0 to 20.0 wt.-%, based on the total mass of the reaction mixture. The invention further relates to a (co)polycarbonate obtained by the process.

Abstract: The present invention relates to a melt transesterification process for the production of (co)polycarbonates from diaryl carbonates and cycloalkylidene diphenols, which process comprises the addition of a monohydroxyaryl compound in an amount of 5.0 to 20.0 wt.-%, based on the total mass of the reaction mixture. The invention further relates to a (co)polycarbonate obtained by the process.

Abstract: The present invention provides a process for working up alkaline waste water which is formed during washing of crude nitrobenzene obtained by nitration of benzene, wherein (i) the alkaline waste water is heated to a temperature of from 150° C. to 500° C. under an increased pressure with respect to atmospheric pressure with exclusion of oxygen; (ii) a base is added to the waste water obtained in (i); and (iii) the waste water obtained in (ii) is purified further by stripping with a stripping gas and the stripping gas stream loaded with impurities is then cooled to a temperature of from 10° C. to 60° C.

Abstract: The invention relates to a process for working up alkaline waste water which is formed during washing of crude nitrobenzene obtained by nitration of benzene, wherein (i) the alkaline waste water is heated under an increased pressure with respect to atmospheric pressure with exclusion of oxygen and is then cooled and expanded; (ii) the waste water obtained in (i) is purified further by stripping with a stripping gas and the stripping gas stream loaded with impurities is then cooled to a temperature of from 10° C. to 60° C.; and (iii) the liquid process product obtained in (ii) by cooling the stripping gas stream loaded with impurities is separated into an aqueous and an organic phase and the organic phase is used further in an aniline production process.