Catalyst preparation and epoxidation process

A technology of epoxidation and catalyst, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc.

Inactive Publication Date: 2002-10-23
ARCO CHEM TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Questions exist concerning the reproducibility of these procedures and the activity of catalysts produced as such

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] water as solvent

[0040] Under an air atmosphere, 6 g of 30% ammonia containing 41 mg palladium bromide (enough to give 0.5 wt. 3 g of TS-1 titanium silicalite (1.2% by weight titanium, calcined in air at 550° C.) was slurried in 124 g of deionized water. After stirring at 23°C for 60 minutes, the above reactor was placed in a constant temperature bath at 60°C and the H 2 , O 2 and propylene was bubbled through the above slurry. The total flow rate of feed is 112cc / min, where H 2 :O 2 : C 3 The volume ratio is 1:1:4 respectively, (O 2 =4% by volume), the balance being nitrogen. GC analysis of the resulting vapor phase showed a 1,2-propylene oxide peak at 2700 ppm and 1,2-propylene oxide / propylene glycol=2. The above catalyst produced 1900 ppm or more of 1,2-propylene oxide in the above steam within 40 hours. A corresponding run using a similar isolated catalyst prepared as in Comparative Example 1 gave a 1,2-propylene oxide peak at 2200 ppm,...

Embodiment 2

[0042] Methanol / water instead of water alone as solvent

Embodiment 3

[0045] Ammonia-free tetraammine palladium dichloride as palladium source

[0046] Tetraamminepalladium dichloride (42 mg) was dissolved in 10 g of deionized water. This solution (enough to give 0.5% by weight palladium in the final catalyst) was added to 3 g of TS- 1 titanium silicalite (1.2% titanium by weight). After stirring at 23°C for 60 minutes, the above reactor was placed in a constant temperature bath at 45°C and the H 2 , O 2 and propylene was bubbled through the above slurry. The total feed flow rate is 112cc / min, where H 2 :O 2 : C 3 The volume ratio is 1:1:4 respectively, (O 2 =4% by volume), the balance being nitrogen. GC analysis of the resulting vapor phase showed a 1,2-propylene oxide peak at 2500 ppm and a 1,2-propylene oxide / propylene glycol ratio of 3.3 in the run.

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PUM

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Abstract

An epoxidation catalyst was prepared by contacting the slurry of vanadium or titanium chert with an ion-exchangeable noble metal complex, and the above catalyst was obtained by contacting with O2, H2 and olefins without drying or roasting. For the epoxidation of alkenes.

Description

field of invention [0001] The present invention relates to a process for the oxidation of alkenes to obtain epoxides. In more detail, the present invention relates to an improved epoxidation process, wherein the titanium or vanadium zeolite catalysts which have been modified with precious metals such as palladium are directly used in the epoxidation reaction without drying or roasting . Background of the invention [0002] Epoxides constitute an important class of chemical intermediates useful in the preparation of polyether polyols, glycols, glycol ethers, surfactants, functional fluids, fuel additives, and the like. A number of different methods for the synthesis of epoxides from the corresponding alkenes have been described in the existing literature. Japanese Patent Application (Kokai No. 4-352771) assigned to Tosoh Corporation and published in 1992 proposes the preparation of 1 by reaction between propylene, hydrogen and oxygen using a catalyst comprising a Group VIII...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/04B01J29/89B01J31/02B01J31/16B01J31/18C07D301/03C07D301/04C07D301/06C07D303/04
CPCB01J29/04B01J29/89B01J31/1616B01J31/1805B01J2231/72B01J2531/824B01J2531/96C07D301/04C07D301/06B01J29/045C07D303/04
Inventor R·A·格雷
Owner ARCO CHEM TECH INC
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