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Process for hydro-oxidation of olefins to olefin oxidized using oxidized gold catalyst

A technology for oxidizing olefins and catalysts, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc. Effects of improved olefin conversion, improved hydrogen efficiency, and high selectivity

Inactive Publication Date: 2003-10-01
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, improvements in activity, lifetime, and hydrogen efficiency are still not ideal

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0038] In the preparation of the support comprising disorganized titanium, the initial support is generally impregnated with the titanium compound at a temperature between 0 and 50° C. under normal pressure for 30 minutes to 24 hours. Non-limiting examples of suitable titanium compounds include titanium alkoxides such as titanium isopropoxide, titanium propoxide, titanium ethoxide, and titanium butoxide; titanium sulfate, titanium oxysulfate, titanium halides, preferably titanium chloride; titanium carboxylates, such as oxalic acid titanium and chromium-titanium acetylacetonate; and organotitanium halides, such as titanocene dichlorides and other organotitacene dichlorides. Mixtures of titanium alkoxides and promoter metal alkoxides, preferably alkaline earth metal alkoxides such as barium alkoxides, may also be used. Mixtures of titanium alkoxides and promoter metal alkoxides in solvents such as ethanol, commercially available from, eg, Gelest, Inc., are deposited together on...

Embodiment 1

[0072] Nanoscale titanosilicate crystals were prepared from tetraethyl orthosilicate (TEOS), titanium n-butoxide and tetrapropylammonium hydroxide (TPAOH) in an aqueous reaction mixture with the following molar composition: 1.0 SiO 2 : 0.015 TiO 2 : 35 H 2 O: 0.33 TPA. A solution containing 5:1 TEOS and isopropanol was added to the TPAOH (20 wt%) solution with vigorous stirring. After stirring for 20 minutes, a solution of titanium tetra-n-butoxide in anhydrous isopropanol (1:5) was slowly added to the first solution under vigorous stirring. The clear solution was stirred for 1 hour, then cooled deionized water was added slowly. The synthesis mixture was sealed in an autoclave with stirring at 170° C. and autogenous pressure for 4 days. The crystalline solid was recovered by centrifugation at 2000 RPM for 3 hours. The crystalline solid was washed twice with hydrochloric acid (0.1M), washed with deionized water, and dried at 70°C for 2 hours. The solid was then calcined a...

Embodiment 2

[0078] Nanoscale titanosilicate crystals were prepared using tetraethyl orthosilicate, titanium n-butoxide, and tetrapropylammonium hydroxide (TPAOH) templates in an aqueous reaction mixture having the following molar composition: 1.0 SiO 2 : 0.025TiO 2:356H 2 O: 0.235 TPAOH. The reaction mixture was prepared by first mixing tetraethylorthosilicate and titanium n-butoxide in a stainless steel vessel under an inert gas atmosphere and then heating at 80° C. for 3 hours. Both the resulting mixture and the TPAOH (40 wt%) solution were cooled to 5°C in an ice bath. The TPAOH solution was slowly added to the alkoxide mixture with vigorous stirring to produce a gel. Cold deionized water was added to the gel and the gel was allowed to warm to room temperature. The gel was aged for 10 hours, then loaded into a stainless steel autoclave and heated at 160°C and 300 psig (2068 kPa) for 6 days. The autoclave was then allowed to cool and the contents were centrifuged at 2000 rpm for 3 ...

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Abstract

Methods and catalysts for the hydrooxidation of olefins having three or more carbon atoms, such as propylene, to form olefin oxides, such as propylene oxide. The method involves contacting an olefin with oxygen under reaction conditions in the presence of hydrogen and a catalyst. The catalyst includes gold oxide dispersed on a titanium-containing carrier. The carrier is preferably a carrier with a variety of titanium coordination environments, such as titanium grafted on titanium silicate. High selectivity for alkylene oxides at good olefin conversion. The catalyst utilizes hydrogen efficiently and has a long life.

Description

technical field [0001] The present invention relates to a process and catalyst for the hydro-oxidation of olefins, such as propylene, to oxidized olefins, such as propylene oxide, with oxygen in the presence of hydrogen. Background technique [0002] Alkylene oxides such as propylene oxide are used to alkoxylate alcohols to form polyether polyols, which are very useful in the production of polyurethanes and synthetic elastomers. Alkylene oxides are also important intermediates in the production of alkylene glycols such as propylene glycol and alkanolamines such as isopropanolamine which are suitable as solvents and surfactants. [0003] Propylene oxide is produced industrially by the well-known chlorohydrin process, in which propylene is reacted with an aqueous solution of chlorine to produce a mixture of propanols. The chlorohydrins are dehydrochlorinated with an excess of base to produce propylene oxide. This method produces a low concentration brine stream. (See K. Wei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01J21/06B01J29/04C07D301/04C07D301/10C07D303/04B01J23/66B01J29/89B01J35/00B01J35/10B01J37/02
CPCB01J21/063B01J23/52B01J23/66B01J29/89B01J37/0203C07D301/04C07D301/10Y02P20/52Y02P20/50B01J35/30B01J35/40C07C27/00
Inventor A·库伯曼R·G·鲍曼H·W·卡拉克G·E·哈特维尔B·J·舒伊曼H·E·图恩斯特拉G·R·梅玛
Owner DOW GLOBAL TECH LLC
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