Abstract:
The invention relates to a method for the production of phthalic anhydride to a specification, using a distillative purification of crude phthalic anhydride, by introduction of crude phthalic anhydride into a distillation column, operating at reduced pressure, withdrawal of the low-boiling fraction from the head, or near the head of the column and withdrawal of the phthalic anhydride, which meets the specification, from a side-tap on the column, whilst operating the column at a reflux ratio x, with 1:1.7
Abstract translation:一种用于通过粗邻苯二甲酸酐的纯化destillacive制备上规格邻苯二甲酸酐的过程中,邻苯二甲酸酐得到粗蒸馏。 列,其在降低的压力下操作,在顶部或附近经由从塔的侧取出口的蒸馏塔的顶部和上规格邻苯二甲酸酐供给低沸以N回流比x取出由列中1:1.7 < X <1:操作第三
Abstract:
In order to prepare imidazolidin-2-ones, 1,3-dioxalan-2-one (ethylene carbonate) is reacted with at least one compound having the formula RNH2, in which R may stand among others for H, alkyl, aryl, heteroalkyl or heteroaryl.
Abstract:
A reactor for testing catalyst systems which has a plurality of catalyst tubes ( 2 ) which are arranged parallel to one another in the interior space of the reactor and whose ends are welded into tube plates and also has caps ( 3 ) at each end of the reactor which each bound a cap space ( 4 ), with a fluid reaction medium ( 5 ) being fed via one cap space ( 4 ) into the catalyst tubes ( 2 ), flowing through the catalyst tubes ( 2 ) and being discharged via the other cap space ( 4 ), and is also provided with a heat exchange medium circuit in which the heat exchange medium ( 6 ) is fed in at one end of the reactor, flows through the intermediate space between the catalyst tubes ( 2 ) and flows out at the other end of the reactor, wherein the catalyst tubes ( 2 ) are arranged in two or more catalyst tube regions ( 7 ) which are thermally separate from one another, is proposed.
Abstract:
The invention concerns a process for preparing alkyne diols or mixtures of alkyne diols with alkyne monools by reacting acetylene with more than equimolar amounts of ketones and/or aldehydes in the presence of an alkaline compound, the alkaline compound being used in a molar amount which is less than half the molar amount of the ketone and/or aldehyde to be reacted, in the presence of ammonia and/or at least one reactive primary amine.
Abstract:
PCT No. PCT/EP94/03179 Sec. 371 Date Apr. 2, 1996 Sec. 102(e) Date Apr. 2, 1996 PCT Filed Sep. 23, 1994 PCT Pub. No. WO95/09877 PCT Pub. Date Apr. 13, 1995An ethylene-based copolymer which is suitable as a flow improver for mineral oil middle distillates and is composed of a) from 50 to 94% by weight of ethylene; b) from 3 to 30% by weight of one or more vinyl esters of C2-C6-monocarboxylic acids; c) from 3 to 20% by weight of one or more aminoalkyl acrylates of the formula I (I) which R1 is hydrogen or methyl, R2 and R3 are identical or different and are each hydrogen or C1-C6-alkyl and A1 is straight-chain or branched C2-C10-alkylene; and d) from 0 to 10% by weight of one or more monomers which are copolymerizable with the monomers a) to c), wherein copolymers containing vinyl acetate as monomer b) and having a number average molecular weight of from 5,000 to 50,000 are excluded from the scope of the copolymer.
Abstract:
PCT No. PCT/EP94/03179 Sec. 371 Date Apr. 2, 1996 Sec. 102(e) Date Apr. 2, 1996 PCT Filed Sep. 23, 1994 PCT Pub. No. WO95/09877 PCT Pub. Date Apr. 13, 1995An ethylene-based copolymer which is suitable as a flow improver for mineral oil middle distillates and is composed of a) from 50 to 94% by weight of ethylene; b) from 3 to 30% by weight of one or more vinyl esters of C2-C6-monocarboxylic acids; c) from 3 to 20% by weight of one or more aminoalkyl acrylates of the formula I (I) which R1 is hydrogen or methyl, R2 and R3 are identical or different and are each hydrogen or C1-C6-alkyl and A1 is straight-chain or branched C2-C10-alkylene; and d) from 0 to 10% by weight of one or more monomers which are copolymerizable with the monomers a) to c), wherein copolymers containing vinyl acetate as monomer b) and having a number average molecular weight of from 5,000 to 50,000 are excluded from the scope of the copolymer.
Abstract:
Carbamic acid vinyl ester compounds are produced by the reaction of corresponding secondary amines with carbon dioxides and acetylenically unsaturated compounds in the presence of a compound of a metal of the platinum group, especially a ruthenium compound, in which one of the two process steps (a) and (b), as desired, and preferably both, are performed: (a) the acetylene compound is repressed during the reaction; (b) the reaction is performed in the presence of a tertiary amine.
Abstract:
Vinyl formate copolymers, preparation thereof, and use thereof in detergents and cleaners Copolymers containing (a) from 5 to 90 mol% of vinyl formate units, (b) from 10 to 95 mol% of units of monoethylenically unsaturated carboxylic acids, (c) from 0 to 70 mol% of units of monoethylenically unsaturated dicarboxylic acids, and (d) from 0 to 30 mol% of units of other monoethylenically unsaturated monomers in copolymerized form and having K values of at least 8 (determined by the method of H. Fikentscher in 1% strength by weight aqueous solution on the sodium salt of the copolymers at pH 7 and 25 C), processes for their preparation by copolymerizing monomer mixtures of (a) from 5 to 90 mol% of vinyl formate, (b) from 10 to 95 mol% of monoethylenically unsaturated carboxylic acids, (c) from 0 to 70 mol% of monoethylenically unsaturated dicarboxylic acids, and (d) from 0 to 30 mol% of other monoethylenically unsaturated monomers in an aqueous medium or in an organic solvent in the presence of free-radical polymerization initiators and use of the vinyl formate copolymers and of the vinyl alcohol copolymers obtainable therefrom by hydrolysis and/or oxidation as detergent and cleaner additives.