Catalyst for preparing epoxypropane with propylene gas-phase epoxidation and preparation method thereof

A technology of propylene oxide and catalyst, which is applied in the field of catalyst for producing propylene oxide and its preparation, and can solve the problems of industrialization gap and low selectivity

Inactive Publication Date: 2009-02-18
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent application with the publication number CN 1260787A discloses a method for epoxidation of propylene with a chloride-containing silver catalyst using oxygen as an oxidant. The catalyst requires a reaction temperature of 250°C and t

Method used

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  • Catalyst for preparing epoxypropane with propylene gas-phase epoxidation and preparation method thereof
  • Catalyst for preparing epoxypropane with propylene gas-phase epoxidation and preparation method thereof
  • Catalyst for preparing epoxypropane with propylene gas-phase epoxidation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: According to the molar ratio of tetraethoxysilane: tetra-n-butyl titanate: ethanol: isopropanol: dodecylamine: water: hydrogen chloride=1: 0.05: 6.5: 1: 0.027: 36: 0.02, in order Take tetraethoxysilane, tetra-n-butyl titanate, ethanol and isopropanol and stir and mix uniformly to obtain solution A. Then dodecylamine was dissolved in 0.01-0.05 mol / L HCl aqueous solution to obtain solution B. Solution A was gradually added dropwise to solution B, then stirred for 0.5 h, and aged at 20° C. for 24 h. The resulting material was washed with deionized water and vacuum-dried at 60° C. overnight, and then calcined at 650° C. for 5 h to obtain the carrier Ti-HMS.

[0024]Take 10.4 mL of chloroauric acid aqueous solution with a concentration of 0.01 mol / L, add 50 mL of deionized water to dilute, adjust the pH value of the solution to 7.0, add 0.5 g of the Ti-HMS carrier prepared above, and keep the pH value of the solution at 7.0. After stirring at ℃ for 1.5h, suction...

Embodiment 2～5

[0026] Examples 2 to 5: Catalyst system as in Example 1, but in the preparation of Ti-HMS carrier, examples 2 to 5 use tetradecylamine, hexadecylamine, octadecylamine, and heptylamine as structure-directing agents, and the chemical composition 1.7Au / Ti-HMS, 1.2Au / Ti-HMS, 1.0Au / Ti-HMS, 0.8Au / Ti-HMS respectively, other reaction conditions are the same as in Example 1. The results of the catalytic reactions are shown in Table 1.

Embodiment 6

[0027] Embodiment 6: Press tetraethoxysilane: tetraisopropoxytitanium: ethanol: isopropanol: dodecylamine: water: hydrogen chloride=1: 0.05: 6.5: 1: 0.027: 36: 0.02, in order Take tetraethoxysilane, tetraisopropoxytitanium, ethanol and isopropanol and stir and mix uniformly to obtain solution A. Then dodecylamine was dissolved in 0.005-0.008 mol / L HCl aqueous solution to obtain solution B. Solution A was gradually added dropwise to solution B, then stirred for 0.5 h, and aged at 40° C. for 15 h. The resulting material was washed with deionized water and vacuum-dried at 50° C. overnight, and then calcined at 550° C. for 6 h to obtain the carrier Ti-HMS.

[0028] Take 10.4 mL of chloroauric acid aqueous solution with a concentration of 0.01 mol / L, add 50 mL of deionized water to dilute, adjust the pH value of the solution to 7.0, add 0.5 g of the Ti-HMS carrier prepared above, and keep the pH value of the solution at 7.0. After stirring at ℃ for 1 h, suction filtration and was...

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Abstract

The invention discloses a catalyst for production of propylene oxide through gas-phase epoxidation of propylene and a preparation method thereof, and relates to a catalyst for production of propylene and a preparation method thereof. The invention provides a catalyst for production of propylene oxide through gas-phase epoxidation of propylene and a preparation method thereof. The catalyst is composed of mAu/Ti-HMS, wherein m represents the mass percentage of Au in the catalyst. According to mass percentage, titanium-silicon solid oxide accounts for 96.0 to 99.7 percent of the catalyst and the Au accounts for 0.3 to 0.4 percent of the catalyst. The molar ratio of silicon to titanium in the titanium-silicon solid oxide is between 5 and 80. A mixed solution of tetra-n-butyl titanate or tetra-iso-propyl-titanate and tetraethyoxysilane is prepared to form a Ti-HMS carrier in the presence of a structure-directing agent of organic primary amine by a sol-gel method, a chloroauric acid compound is loaded on the carrier though impregnation by a deposition precipitation method to obtain a Ti-HMS carried gold catalyst. The catalyst obtained has high catalytic and hydrogen efficiency under a mild reaction condition without the presence of any dressing agent and assistant and is renewable.

Description

technical field [0001] The invention relates to a catalyst for producing propylene oxide and a preparation method thereof, in particular to a catalyst for producing propylene oxide by gas-phase epoxidation of propylene and a preparation method thereof. Background technique [0002] Propylene oxide (PO) is an important organic chemical raw material and the third largest organic chemical product in the production of propylene derivatives after polypropylene and acrylonitrile. At present, the industrial production methods of PO mainly include the chlorohydrin method and the co-oxidation method (Halcon method). These two methods account for more than 99% of the world's total production capacity, of which the co-oxidation method accounts for about 60%. The traditional chlorohydrin method has a short process, mature technology, large operating load flexibility, low requirements on the purity of raw material propylene, and low construction investment. The disadvantage is that it ...

Claims

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Application Information

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IPC IPC(8): B01J29/89C07D301/10B01J23/52
CPCY02P20/52
Inventor 袁友珠杨宏伟汤丁亮
Owner XIAMEN UNIV
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