摘要:
The invention relates to a method for producing polytetrahydrofuran, tetrahydrofuran copolymers, diesters or monoesters of these polymers with low colour index by polymerization of tetrahydrofuran in the presence of at least one telogen and/or comonomer on a heterogeneous catalyst. The invention is characterized in that polymerization takes place in the presence of hydrogen.
摘要:
The invention relates to a method for hydrogenating a heterocyclic compound or a mixture of two or more heterocyclic compounds by bringing said unsaturated heterocyclic compound or mixture of two or more heterocyclic compounds into contact with a gas containing hydrogen, in the presence of a catalyst. Said catalyst takes the form of an active metal comprising at least one metal of subgroup VIII of the periodic table, said metal being applied to a support which has macropores.
摘要:
The invention relates to a method for producing an ethylamine by reacting ethanol with ammonia, with a primary amine or with a secondary amine in the presence of hydrogen or of a heterogeneous hydrogenation/dehydrogenation catalyst, during which a biochemically or biologically produced ethanol (bioethanol) is used. The catalyst contains one or more metals of group VIII and/or IB of the periodic table and after activation with hydrogen, has a CO absorption capacity of > 100 µmol CO/g of catalyst.
摘要:
A process for preparing N,N-dimethylacetamide (DMAC) by continuously reacting methyl acetate (MeOAc) with dimethylamine (DMA) in the presence of a basic catalyst, wherein MeOAc is used in the form of a methanolic solution which is obtained as a by-product in the preparation of polyTHF by transesterifying polyTHF diacetate with methanol.
摘要:
The invention relates to a method for producing N,N-dimethylacetamide (DMAC) by the continuous reaction of methyl acetate (MeOAc) with dimethyl amine (DMA) in the presence of an alkaline catalyst. Said method is characterised in that the MeOAc is in the form of a methanolic solution and that between 0.0002 and 0.09 mol catalyst per mol MeOAc is used. The reaction is carried out at a temperature ranging between 90 and 140 °C and at an absolute pressure ranging between 10 and 30 bar.
摘要:
The invention relates to a method for the continuous production of an amine by reacting a primary or secondary alcohol, aldehyde and/or ketone with hydrogen and a nitrogen compound, selected from the group containing ammonia and primary and secondary amines, at a temperature that ranges between 60 and 300 °C in the presence of a catalyst containing copper. According to the invention, the catalytically active mass of the catalyst contains the following prior to its reduction with hydrogen: 20 to 85 wt. % aluminium oxide (Al2O3), zirconium dioxide (ZrO2), titanium dioxide (TiO2) and/or silicon dioxide (SiO2); 1 to 70 wt. % copper compounds containing oxygen, calculated as CuO; 0 to 50 wt. % magnesium compounds containing oxygen, calculated as MgO; chromium compounds containing oxygen, calculated as Cr2O3; zinc compounds containing oxygen, calculated as ZnO; barium compounds containing oxygen, calculated as BaO; and/or calcium compounds containing oxygen, calculated as CaO; and less than 30 wt. % nickel compounds containing oxygen, calculated as NiO, in relation to the copper compounds containing oxygen, calculated as CuO. The reaction in the gas phase takes place isothermally in a tubular reactor.
摘要:
The invention relates to a method for hydrogenating a heterocyclic compound or a mixture of two or more heterocyclic compounds by bringing said unsaturated heterocyclic compound or mixture of two or more heterocyclic compounds into contact with a gas containing hydrogen, in the presence of a catalyst. Said catalyst takes the form of an active metal comprising at least one metal of subgroup VIII of the periodic table, said metal being applied to a support which has macropores.
摘要:
The invention relates to a method for producing polytetrahydrofuran and polytetrahydrofuran copolymers, diesters or monoesters thereof by polymerising tetrahydrofuran in the presence of at least one telogen and/or comonomer on acid- activated montmorillonite catalysts, whereby the ratio of the montmorillonite structure to the sum of the muscovite and kaolin structure in the montmorillonite catalyst, which is determined from the intensities of the reflexes measured at 5.5° 2È for montmorillonite, 9.0° 2È for muscovite and 12,5° 2È for kaolin is, after acid activation, at least 5:1.