摘要:
A process for the regeneration of a zeolite catalyst which comprises treating the catalyst thermally in the presence of a gas stream at temperatures above 120° C., the weight-based residence time of the gas stream over the catalyst during the thermal treatment being greater than 2 hours.
摘要:
A process for distillative removal of part or all of an azepine derivative (III) selected from the group consisting of aminohexylideneimine, tetrahydroazepine, hexylhexahydroazepine and aminohexylhexahydroazepine from a mixture (II) comprising an azepine derivative (III) and an amine (I) comprises conducting the distillation with an overhead temperature of from 160 to 250° C.
摘要:
Molded bodies in the form of packing bodies comprising a macroporous strongly acid or basic ion exchange resin having a voids fraction of 5-95 vol % of the macro shape without pores, a BET surface area of 0.1-1,000 sq m/g, and an ion exchange capacity of 0.05-10 meq/g.
摘要:
A mixture (M1) comprising an alkene and oxygen is worked up by a process in which (i) oxygen is removed from the mixture (M1) by a nondistillative method to give a mixture (M2) and (ii) the alkene is separated off from the mixture (M2) by distillation.
摘要:
In a process for preparing oxidation products of cyclohexane by catalytic oxidation with oxygen-containing gases in the liquid phase, where the gases are brought into contact essentially uniformly with the liquid cyclohexane in a reaction zone, liquid cyclohexane and the oxygen-containing gases are passed in countercurrent through the reaction zone.
摘要:
The present invention relates to a method for the hydrothermolysis of a mono- and/or oligosaccharide-comprising composition which in addition comprises at least one monoalkyl and/or dialkyl ether of a polyalkylene glycol, and also relates to a hydrothermolysis device.
摘要:
A process for the preparation of propylene oxide in the presence of methanol, in which propylene oxide is separated from a mixture propylene oxide and methanol, and the resultant methanol containing mixture is worked up, including seperating methanol from a mixture comprising methanol and methyl formate during the work-up.
摘要:
A process for distillative removal of 6-aminocapronitrile from mixtures (I) comprising 6-aminocapronitrile and an imine (II) comprises conducting the distillation in the presence of carbon dioxide.
摘要:
An organic compound having at least one C—C double bond is epoxidized by means of hydrogen peroxide in the presence of at least one catalytically active compound and at least one solvent, wherein a product mixture comprising α-hydroperoxyalcohols is reduced using at least one reducing agent. The process advantageously comprises at least the following steps: (i) reacting an organic compound having at least one C—C double bond with hydrogen peroxide in the presence of at least one catalytically active compound and at least one solvent to give a product mixture P1 comprising α-hydroperoxyalcohols; (ii) separating an epoxide formed in the reaction in step (i) and the unreacted organic compound having at least one C—C double bond from P1 or P1′ to give a product mixture P2 or P2′, where P2 comprises the α-hydroperoxyalcohols formed as by-product in the reaction in step (i) and P2′ is largely free of α-hydroperoxyalcohols; (iii) treating P1 and/or P2 with at least one reducing agent so that the α-hydroperoxyalcohols are converted into corresponding glycols to give a product mixture P1′ or P3.
摘要:
A process for hydrogenation of aliphatic alpha, omega-dinitriles in the presence of a heterogeneous fixed bed catalyst comprises using a reaction mixture comprising from 2 &mgr;mol to 30 mmol NA, K, Rb, Cs, Mg, Ca, Sr, Ba or Mn or mixtures thereof in the form of a basic salt, based on 10 mol of aliphatic alpha, omega-dinitrile used.