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Epoxidation process using improved heterogeneous catalyst composition

A catalyst and epoxidation technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems that it is difficult to obtain high titanium content, and the final titanium content of the catalyst cannot be accurately controlled.

Inactive Publication Date: 2003-11-26
ARCO CHEM TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another disadvantage is that it is difficult to obtain high titanium content, because washing can remove a large amount of titanium, and this effect is more obvious when the amount of titanium reagent is larger than that of silica
Moreover, this method cannot precisely control the final titanium content of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-A

[0048] This example is illustrative of the catalyst preparation method of the present invention.

[0049] Set the surface area to 320m 2 A dry sample of Grace V-432 silica (30 g) with a pore volume of 1.1 ml / g and a pore volume of 1.1 ml / g was placed in a 500 ml three-necked round bottom flask equipped with a condenser, an inert gas inlet, and a sodium carbonate Scrubber for aqueous solutions. A solution containing 51 g of heptane and 2.1 ml (3.6 g; 0.019 mol) of titanium tetrachloride was then added to the flask under a dry inert gas atmosphere. The resulting mixture was heated to reflux for 2 h using an oil bath. The temperature of the oil bath was then raised to 150°C and an inert gas was flowed through the flask to drive off the solvent. The temperature of the oil bath was raised to 200 °C and maintained at this temperature for 2 h.

[0050] The resulting solid was charged into a quartz reactor and heated to 800°C in an air stream. Hydrochloric acid generated during w...

Embodiment 1-B

[0052] The method of Example 1-A was repeated, except that air was used as the carrier gas, and steam treatment was carried out at 500°C.

Embodiment 1-C

[0054] The method of Example 1-A was repeated, except that air was used as the carrier gas, and steam treatment was carried out at 600°C.

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Abstract

Highly active and selective epoxidation catalysts are prepared by combining silica or the like with a non-oxygenated hydrocarbon solution of titanium halide, removing solvent, calcining at an elevated temperature (preferably, in a substantially oxygen-free atmosphere), and, optionally, reacting with water and silylating. The resulting materials are useful heterogeneous catalysts for transforming olefins to epoxides using organic hydroperoxides.

Description

[0001] This application is a continuation-in-part of 08 / 900,794, filed July 25, 1997, which is a continuation-in-part of 08 / 851,105, filed May 5, 1997. field of invention [0002] The present invention relates to an improved epoxidation process in which a titanium-containing catalyst composition is employed. The catalyst composition is prepared by liquid-phase impregnation of a silicon-containing solid with a hydrocarbon solution of a titanium halide, such as titanium tetrachloride, followed by calcining. The catalyst can optionally be reacted with water and / or a silylating agent. Catalyst performance is enhanced by calcination at high temperature (preferably at least 700°C) and substantially oxygen-free conditions. Background of the invention [0003] A number of different methods of preparing epoxides have been developed. One such method involves the epoxidation of olefins in a liquid phase reaction using organic hydroperoxides as oxidizing agents and certain dissolved t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J21/08B01J37/02C07D301/19
CPCB01J37/0203B01J21/08C07D301/19B01J21/063C07D301/00
Inventor Y·-Z·韩K·M·卡洛尔E·莫拉勒斯R·G·加斯廷格
Owner ARCO CHEM TECH INC
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