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Preparation method and application of propylene epoxidation catalyst

A catalyst and epoxidation technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of high price, non-recyclable template agent, high catalyst cost, etc. problem, to achieve the effect of reducing decomposition, improving selectivity, and high particle strength

Active Publication Date: 2018-02-23
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, one of the biggest disadvantages of the sol-gel method is that an expensive quaternary ammonium salt needs to be added as a template in the preparation process, and generally it needs to be roasted at high temperature to remove the template. The template is not recyclable, resulting in higher catalyst costs.

Method used

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  • Preparation method and application of propylene epoxidation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Dissolve 208g of ethyl orthosilicate in 792g of isopropanol, then add 1.67g of formic acid as a hydrolysis catalyst, add 10.8g of deionized water dropwise, react at 50℃ for 1h, record it as liquid A; weigh 8.5g of titanate After the butyl ester is dissolved in 19.8g isopropanol, add it dropwise to solution A, stir evenly, and record it as solution B; weigh 0.067g NH 4 ReO 4 And 0.17gZnCl 2 Dissolve in 25.2g deionized water, add dropwise to B solution, stir evenly, and record as C solution. The C liquid reacted for 4 hours to form a sol. The sol was sprayed into liquid ammonia using a centrifugal atomizer to form, and then the sol was expanded at 80°C for 15 hours. The expanded catalyst precursor was dried in an oven at 80°C for 2h, and calcined in a muffle furnace at 550°C for 3h. The calcined sample is subjected to gas phase silanization: 3g of hexamethyldisilazane is added to the vaporization tank, the heating temperature of the vaporization tank is 130℃, and N 2 Bring...

Embodiment 2

[0051] Dissolve 249.6g of ethyl orthosilicate in 750.4g of isopropanol, then add 2.5g of formic acid as a hydrolysis catalyst, add 21.6g of deionized water dropwise, react at 60°C for 90min, record it as liquid A; weigh out 17.85g of titanium After dissolving tetrabutyl ester in 26.78g isopropanol, add it dropwise to solution A, stir evenly, and record it as solution B; weigh 0.422g NH 4 ReO 4 And 0.714gZnCl 2 Dissolve in 21.6g deionized water, add dropwise to B solution, stir evenly, and record as C solution. Liquid C reacts for 2 hours to form a sol. The sol is sprayed into liquid ammonia using a centrifugal atomizer to form, and then the sol is expanded at 120°C for 6 hours. The expanded catalyst precursor was dried in an oven at 100°C for 3 hours, and calcined in a muffle furnace at 450°C for 5 hours. The roasted sample is subjected to vapor phase silanization: 7.2g of hexamethyldisilazane is added to the vaporization tank, the heating temperature of the vaporization tank i...

Embodiment 3

[0054] Dissolve 291.2g of ethyl orthosilicate in 707.8g of isopropanol, then add 4.36g of acetic acid as a hydrolysis catalyst, add 50.4g of deionized water dropwise, react at 70°C for 140min, record it as liquid A; weigh 29.75g of titanium After dissolving 29.75g of isopropanol, tetrabutyl ester was added dropwise to A solution, stirred evenly, and recorded as B solution; Weigh 1.172g NH 4 ReO 4 And 1.785gZnCl 2 Dissolve in 10.08g deionized water, add dropwise to B solution, stir evenly, and record as C solution. The liquid C reacts for 1 hour to form a sol. The sol is sprayed into liquid ammonia using a centrifugal atomizer to form, and then the sol is expanded at 140°C for 3 hours. The expanded catalyst precursor was dried in an oven at 120°C for 5 hours, and calcined in a muffle furnace at 600°C for 2 hours. The calcined sample is subjected to vapor phase silanization: 12.6g of hexamethyldisilazane is added to the vaporization tank, the heating temperature of the vaporizati...

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Abstract

The invention discloses a preparation method a propylene epoxidation catalyst. The preparation method includes the steps: performing prehydrolysis on silicon sources; adding titanium sources to reactthe silicon sources and the titanium sources to form colloidal sol; spraying atomized colloidal sol into liquid ammonia to form; performing pore expanding, drying, roasting and silanization treatmentto obtain the Ti-SiO2 composite oxide catalyst. The catalyst is applied to the chemical process of preparing propylene epoxide by propylene epoxidation, the average selectivity of the propylene epoxide reaches up to 97.5%, and the catalyst has industrial application prospects.

Description

Technical field: [0001] The invention relates to a preparation method of a propylene epoxidation catalyst, specifically Ti-SiO 2 The preparation method of the composite oxide catalyst and its use as a catalyst to catalyze the epoxidation of propylene to prepare propylene oxide. Background technique: [0002] Ethylbenzene co-oxidation process (PO / SM) with ethylbenzene hydrogen peroxide (EBHP) as oxidant and CHP process with cumene hydrogen peroxide (CHP) as oxidant are two important processes for the production of propylene oxide; The two processes overcome the shortcomings of the chlorohydrin method, such as large corrosion and excessive sewage, and have the advantages of low product cost and less environmental pollution. [0003] The catalyst used in the epoxidation process of heterogeneous PO / SM process is Ti-SiO 2 For composite oxides, US published patents US3829392 and US2003166951, Chinese published patents CN1894030 and CN1720100 disclose their preparation methods: first dry ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/36B01J35/10B01J21/08C07D301/14C07D303/04
CPCC07D301/14C07D303/04B01J21/08B01J23/002B01J23/36B01J2523/00B01J35/638B01J35/635B01J35/615B01J2523/27B01J2523/41B01J2523/47B01J2523/74Y02P20/52C07D301/19B01J21/063B01J29/48B01J37/0018B01J37/033B01J2229/32B01J35/647B01J6/001B01J37/0054B01J37/08
Inventor 王磊王同济叶飞杨立超易光铨崔娇英初乃波黎源华卫琦
Owner WANHUA CHEM GRP CO LTD
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