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Propylene epoxidation catalyst, as well as preparation method and application thereof

A catalyst and epoxidation technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of reducing catalyst activity and achieve high product selectivity, high stability, and high mechanical strength Effect

Active Publication Date: 2013-12-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst prepared by this patent has high catalytic propylene epoxy reaction activity and PO selectivity, but the addition of alkali metal reduces the activity of the catalyst to a certain extent, and the patent does not involve the stability of the catalyst

Method used

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  • Propylene epoxidation catalyst, as well as preparation method and application thereof
  • Propylene epoxidation catalyst, as well as preparation method and application thereof
  • Propylene epoxidation catalyst, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] a) The preparation of titanium-silicon molecular sieve is the same as in Comparative Example 1.

[0047] b) Catalyst preparation: Take 20g of titanium-silicon molecular sieve, 0.66g of ZnO and 0.75g of scallop powder, mix and grind evenly, add 15.8g of silica sol and 0.48g of liquid paraffin, mix and knead, extrude into strips, dry in the air, and cut to grow 1~ 2mm, roasted at 540°C for 6h to obtain a shaped catalyst; take 12g of shaped catalyst and mix it with 60mL of 0.2mol / L ethylenediamine aqueous solution, put it in a stainless steel synthesis kettle, and treat it at 120°C for 120h under autogenous pressure, filter, dry, The catalyst is obtained by calcining.

[0048] c) Catalyzed propylene epoxidation performance was evaluated on a small fixed bed, except that the concentration of hydrogen peroxide was 50wt%, the molar ratio of methanol / hydrogen peroxide was 6.8, and the concentration of ammonia water was 0.4mmol / L, other measurement conditions were the same as t...

Embodiment 2

[0052] a) The preparation of titanium-silicon molecular sieve is the same as in Comparative Example 1.

[0053] b) Catalyst preparation: take 20g titanium silicon molecular sieve, 2.2g Al 2 o 3 Mix and grind evenly with 1.0g scallop powder, add 20.8g silica sol (SiO 2 concentration of 30wt%) and 0.48g of liquid paraffin, extruded, dried, cut to grow 1-2mm, and roasted at 540°C for 6h to obtain a molded catalyst; take 12g of molded catalyst and 60mL of aqueous solution containing tetrabutylammonium hydroxide (0.12mol / L), put into a stainless steel synthesis kettle, treat at 170°C for 24 hours under autogenous pressure, filter, dry, and roast to obtain the catalyst.

[0054] c) Catalytic propylene epoxidation performance was evaluated on a small fixed bed, except that the temperature of the water bath was 38°C and the concentration of ammonia water was 1.2mmol / L, other measurement conditions were the same as in Example 1, and the results are shown in Table 3:

[0055] The cat...

Embodiment 3

[0058] a) The preparation of titanium-silicon molecular sieve is the same as in Comparative Example 1.

[0059] b) Catalyst preparation: take 20g titanium silicon molecular sieve, 0.66g TiO 2 Mix and grind evenly with 1.0g scallop powder, add 15.8g silica sol (SiO 2 concentration of 30wt%) and 0.48g of liquid paraffin, extruded, dried, cut to grow 1-2mm, and roasted at 540°C for 6 hours to obtain a molded catalyst; take 12g of molded catalyst and 60mL of tetrapropylammonium hydroxide Aqueous solutions (0.03mol / L) were mixed, put into a stainless steel synthesis kettle, treated at 170°C for 48 hours under autogenous pressure, filtered, dried, and roasted to obtain the catalyst.

[0060] c) Catalytic propylene epoxidation performance was evaluated on a small fixed bed, except that the concentration of ammonia water was 1.2mmol / L, other measurement conditions were the same as in Example 1, and the results are shown in Table 4:

[0061] The catalytic performance of the catalyst ...

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Abstract

The invention provides a preparation method of a propylene epoxidation catalyst. The propylene epoxidation catalyst with high activity and high stability is prepared by the following steps: adding a pore-forming agent, a binding agent and a lubricating agent into raw materials comprising a titanium silicon molecular sieve and an inorganic oxide; mixing, kneading and forming to obtain a forming body; drying and roasting the forming body; treating the roasted forming body by adding an alkaline solution; and filtering, drying and roasting to obtain the high-activity and stable propylene epoxidation catalyst. The propylene epoxidation catalyst prepared by the preparation method has excellent mechanical strength and excellent diffusibility and can be directly applied to a fixed bed reactor. Experiments prove that the catalyst prepared by the preparation method has excellent catalytic activity, excellent product selectivity and long catalytic life when being applied to propylene epoxidation reaction.

Description

technical field [0001] The invention belongs to the field of preparation methods of petrochemical catalysts, and more specifically relates to a highly active and stable propylene epoxidation catalyst and a preparation method. Background technique [0002] Propylene oxide is one of the important intermediates in petrochemical industry. Among the propylene derivatives, propylene oxide is the third largest derivative after polypropylene and acrylonitrile. The traditional industrial methods for producing propylene oxide mainly include the chlorohydrin method and the co-oxidation method (Halcon method), of which the former seriously pollutes the environment, and the production cost of the latter is affected by the co-product market. In 1983, Taramasso et al. (US Patent4410501) invented titanium-silicon molecular sieve (TS-1), which provided a new method for the epoxidation of olefins through hydrogen peroxide, and conducted in-depth research on the epoxidation of propylene. Tita...

Claims

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Application Information

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IPC IPC(8): B01J29/89C07D301/12C07D303/04
Inventor 王祥生宋万仓
Owner DALIAN UNIV OF TECH
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