摘要:
A method of preparing epoxidation catalysts is disclosed. The method comprises: (a) adding an inorganic siliceous solid to a column to produce a solid-filled column; (b) adding to the solid-filled column a solution comprising titanium tetrachloride and a hydrocarbon solvent to produce a titanium tetrachloride-impregnated solid; and (c) calcining the titanium tetrachloride-impregnated solid at a temperature from 500° C. to 1000° C. to produce the catalyst. The inorganic siliceous solid has a pore volume of at least 0.8 cm3/g.
摘要:
Provided is a process of conducting olefin epoxidation which comprises contacting an olefin and an oxidant in the presence of Ti-UCB-4 to thereby prepare an epoxide. The Ti-UCB-4 catalyst is prepared by delaminating a B-SSZ-70 precursor and substituting Ti atoms for the boron atoms on the surface of the zeolite material lattice framework.
摘要:
Method of preparing epoxidation catalysts are disclosed, including methods comprising reacting an inorganic siliceous solid with a metal complex of the formulas: wherein the variables are defined herein.
摘要:
A process for epoxidizing an olefin comprising contacting an olefin with an oxidant in the presence of an insoluble oxidation catalyst in a solvent system comprising an organic water-miscible solvent to form an alkylene oxide. The insoluble oxidation catalyst comprises a metal, preferably selected from the group consisting of tungsten, cerium, and niobium. The metal is directly incorporated within a solid mesoporous silicate support, such as one selected from the group consisting of KIT-5, KIT-6, and TUD-1.
摘要:
A process for preparing a divinylarene dioxide including reacting (a) at least one divinylarene; (b) at least one peroxycarboximidic acid; (c) at least one solvent; and (d) at least one basic compound, under conditions to form a reaction mixture containing a divinylarene dioxide product; and then separating the divinylarene dioxide product from the other reaction mixture components to obtain a purified divinylarene dioxide product.
摘要:
The invention relates to a process for the liquid phase oxidation of ethylbenzene into ethylbenzene hydroperoxide, wherein the ethylbenzene hydroperoxide concentration is kept below 20 wt.% on the basis of the total weight of the reaction mixture, and wherein styrene and/or a styrene derivative is fed to the ethylbenzene. The concentration of said styrene and/or a styrene derivative may be from 0.01 to 5.0 wt.%.
摘要:
A process for producing cumene, characterized in that a copper catalyst precursor containing copper in an oxidized state is reduced with hydrogen in liquid cumene to prepare a copper catalyst and cumyl alcohol is subjected to hydrogenolysis in the presence of the copper catalyst; and a process for producing propylene oxide which includes that process.
摘要:
A method for continuously producing propylene oxide, which comprises supplying an organic peroxide and propylene to an epoxidation reactor in which a solid catalyst for epoxidation is packed, thereby subjecting them to an epoxidation reaction, the method having a propylene pre-treatment step described below: propylene pre-treatment step; a step of treating at least a part of propylene supplied to the epoxidation reactor, which comprises removing an oxygen-containing organic compound contained in propylene.
摘要:
Process of manufacturing propylene oxide and styrene which process comprises: (i) contacting propene with a mixture of ethylbenzene hydroperoxide and ethylbenzene in the presence of catalyst to obtain propylene oxide and 1-phenylethanol, (ii) separating propylene oxide from the reaction mixture obtained in step (i) , (iii) subjecting the mixture obtained in step (ii) to distillation to obtain a top stream containing ethylbenzene and a bottom stream containing 1-phenylethanol, (iv) subjecting the bottom stream containing 1-phenylethanol obtained in step (iii) to a further distillation to obtain a top stream containing purified 1-phenylethanol and a bottom stream containing heavy by¬ products, (v) contacting the top stream containing 1- phenylethanol obtained in step (iv) with a dehydration catalyst to obtain styrene and water, (vi) subjecting the reaction mixture obtained in step (v) to distillation to obtain a top stream containing styrene and water and a bottom stream containing unconverted 1-phenylethanol, 2-phenylethanol, methylphenylketone and by-products, (vii) subjecting the bottom stream containing unconverted 1-phenylethanol, 2-phenylethanol, methylphenylketone and further by-products obtained in step (vi) to distillation to obtain a top stream containing methylphenylketone and a bottom stream containing 2-phenylethanol and heavy by-products, and (viii) recycling to step (iv) the bottom stream containing 2-phenylethanol and heavy by-products obtained in step (vii) , wherein the bottom stream obtained in step (vii) is introduced into the distillation of step (iv) below the point at which the bottom stream containing 1-phenylethanol obtained in step (iii) is introduced.