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Olefin epoxidation method

A technology for epoxidation and olefins, applied in chemical instruments and methods, organic chemistry, chemical/physical processes, etc., can solve the problems of difficult separation of catalysts and products, unfavorable industrial production, and cumbersome process flow, etc. Achieve the effect of reducing the occurrence of side reactions, mitigating thermal effects, and improving reaction efficiency

Active Publication Date: 2013-07-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] CN1256274A has proposed the technology that titanium-silicon molecular sieve catalyzes propylene, hydrogen peroxide epoxidation to continuously produce propylene oxide, in this process, catalyzer exists with slurry state, although obtained better raw material conversion rate and product yield, but because catalyzer It is in a slurry state and needs to be separated from the product after the reaction for reuse
This leads to a cumbersome process flow, which is not conducive to large-scale industrial production. In addition, in the process, the catalyst will also have unavoidable loss.
The TS-1 of CN1639143A catalyzes the epoxidation of propylene and hydrogen peroxide, and adopts the reaction mode of autoclave, which still does not solve the problem of difficult separation of catalyst and product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In the polymerization kettle, add 7.5g of titanium-silicon molecular sieve powder, 90g of polymerized monomer styrene and 30g of divinylbenzene, and 60g of pore-forming agent liquid wax. 1.5 g of benzoyl was polymerized at 90° C. for 6 hours to obtain a bulk titanium-silicon molecular sieve catalyst. Then carry out crushing and granulation, select a catalyst with a suitable particle size after screening, add 250 ml of 1,2-dichloroethane to swell, and swell for 5 hours at normal temperature. After pouring out 1,2-dichloroethane, add 200ml of ethyl acetate for solvent extraction. The extraction reaction temperature is 55°C, and the extraction time is 4 hours. The same method is used for three extractions to obtain a composite of titanium silicon molecular sieve and resin. Catalyst A, its physical and chemical properties are shown in Table 1.

Embodiment 2

[0039] In the polymerization kettle, add 15g of titanium-silicon molecular sieve powder, 90g of polymerized monomer styrene, 15g of divinyltoluene, 25g of divinylxylene, and pore-forming agent C 5 60g of aliphatic alcohol, stirred and mixed evenly, when the temperature of the water bath was raised to 80°C, 2.0g of initiator azobisisobutanol was added, and the reaction temperature was polymerized at 100°C for 6 hours to obtain a block titanium silicon molecular sieve catalyst. Then carry out crushing and granulation, select a catalyst with a suitable particle size after screening, add 250 ml of 1,2-dichloroethane to swell, and swell for 5 hours at normal temperature. After pouring out 1,2-dichloroethane, add 200ml of xylene for solvent extraction. The extraction reaction temperature is 55°C, and the extraction time is 4 hours. The same method is used for three extractions to obtain a titanium-silicon molecular sieve and resin composite catalyst. B, its physical and chemical pro...

Embodiment 3

[0041] The weight of the titanium-silicon molecular sieve powder in Example 1 was changed to 30 g, the extraction solvent was replaced with chloroform, and the rest was the same as in Example 1 to obtain a titanium-silicon molecular sieve and resin composite catalyst C, whose physical and chemical properties are shown in Table 1.

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Abstract

The invention discloses an olefin epoxidation method. The olefin epoxidation method comprises the step of performing epoxidation on the olefin and hydrogen peroxide in the presence of a catalyst, wherein alcohol serves as a solvent; and the catalyst is a titanium silicon molecular sieve and resin composite catalyst. In the olefin epoxidation method, a fixed bed reaction mode is adopted, so the problem that the titanium silicon catalyst powder and the reaction solution are difficult to separate in a slurry reactor in the past is solved, and reaction efficiency is improved.

Description

technical field [0001] The invention belongs to an olefin epoxidation method, in particular to a fixed bed olefin epoxidation method. Background technique [0002] Since the Italian Enichem company first synthesized the lattice oxygen-selective titania-silicon molecular sieve catalyst TS-1 in 1983, it has become a hot spot in the research of oxidation catalysts due to its excellent oxidation selectivity and mild reaction conditions, and this discovery is regarded as environmentally friendly. A major breakthrough in catalyst development. [0003] Titanium-silicon molecular sieve catalysts play a very important role in the selective oxidation of organic compounds, such as the epoxidation of propylene with hydrogen peroxide under the action of titanium-silicon molecular sieve catalysts to prepare propylene oxide. In industrial applications, titanium-silicon molecular sieve catalysts exhibit excellent shape-selective catalytic performance. Generally, the smaller the particle si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/12C07D303/04B01J31/38
Inventor 孙万付王海波勾连科黎元生宋丽芝艾抚宾
Owner CHINA PETROLEUM & CHEM CORP