摘要:
Continuously operated process for the purification by distillation of the methanol used as solvent in the synthesis of propylene oxide by reaction of a hydroperoxide with propylene, with the methoxypropanols, as azcotrope with water, and the low boilers and high boilers simultaneously being separated off, wherein the solvent mixture obtained in the synthesis is fractionated in a dividing wall column.
摘要:
Process for preparing propylene oxide, which comprises at least the steps (iii) and (iv) (iii) separating off propylene oxide from a mixture (M1) comprising propylene oxide and at least one solvent by distillation in a distillation column, giving a bottom stream and a vapor stream consisting essentially of propylene oxide; (iv) compressing the vapor stream obtained in (iii) by means of at least one compressor to give a compressed vapor.
摘要:
Continuously operated process for the intermediate isolation of the oxirane formed by reaction of a hydroperoxide with an organic compound in the oxirane synthesis, wherein the product mixture formed in the synthesis is fractionated in a dividing wall column to give a low-boiling fraction, an intermediate-boiling fraction and a high-boiling fraction and the oxirane is taken off in the intermediate-boiling fraction at the side offtake and the hydroperoxide is taken off in the high-boiling fraction at the bottom of the column.
摘要:
Continuous process for the epoxidation of olefins by means of hydroperoxide, in which the epoxidation is carried out in a reactor in which at least one catalyst suspended in a liquid phase is present, wherein the liquid phase is passed through a device which has openings or channels and is installed in the reactor and the epoxide-containing liquid is separated off by means of crossflow filtration so that the suspended catalyst is retained in the reaction system.
摘要:
The invention relates to a method for continuously returning an olefin which has not been reacted with hydroperoxide in order to form oxiranes during the epoxidation of olefins. Said olefin is contained in the flow of waste gas which is produced during epoxidation. Said method is characterised by the following steps: (i) compressing and cooling the flow of waste gas, (ii) separating the olefin from the flow of waste gas obtained in step (i) by distillation,(iii) epoxidating the olefin separated in (ii) with hydroperoxide.
摘要:
Process for the continuous preparation of propylene glycols, which comprises the steps (i) to (ii): (i) reacting propylene with hydrogen peroxide to form propylene oxide and give propylene glycols as by-products, (ii) reacting the propylene oxide obtained in step (i) with water to give propylene glycols, (iii) separating off the propylene glycols obtained in steps (i) and (ii).
摘要:
Process for preparing oxiranes by reacting an organic compound with a hydroperoxide in the presence of a solvent and a catalyst, which comprises at least the steps (i) to (iii): (i) reaction of the hydroperoxide with the organic compound to give a product mixture comprising the reacted organic compound and unreacted hydroperoxide, (ii) separation of the unreacted hydroperoxide from the mixture resulting from step (i), (iii) reaction of the hydroperoxide which has been separated off in step (ii) with the organic compound, wherein the reaction in step (iii) is carried out in a tube reactor which has at least two feed points for the reaction mixture comprising at least the organic compound, the hydroperoxide and the solvent or at least two outlets for the product mixture, or at least two feed points and at least two outlets.
摘要:
Process and apparatus for the continuous preparation of a chemical compound in at least one reactor, where at least one of the reactors is a shell-and-tube reactor which has a shell and at least one internal tube located within the shell, wherein at least one of the internal tubes has, at least in part, a noncircular cross section and a helical configuration in the region in which it is surrounded by the shell.
摘要:
Process for the catalyzed reaction of an organic compound with a hydroperoxide in at least one reactor using at least two different zeolite catalysts, wherein at least two of the different zeolite catalysts are used physically separately from one another.
摘要:
A process for preparing a ketone, in particular cyclododecanone, by reacting cyclododecatriene with dinitrogen monoxide to obtain cyclododecadienone and hydrogenating the resulting cyclododecadienone, in particular to give cyclododecanone.