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Catalyst for preparing propylene oxide by oxidation of propylene and its preparation and application

A catalyst, propylene technology, used in physical/chemical process catalysts, molecular sieve catalysts, organic chemistry and other directions, can solve problems such as unsatisfactory activity and stability

Active Publication Date: 2022-03-25
BEIJING SINO SPHERE PETROCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, there has been no research and application of titanium-silicon molecular sieve membranes in the reaction of propylene oxidation to propylene oxide; moreover, it has been found in practice that the existing titanium-silicon molecular sieve membranes are directly used as propylene oxidation to prepare epoxy When used as a catalyst for propane, the activity and stability are not very ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides the preparation of a modified titanium-silicon molecular sieve membrane catalyst, including:

[0030] (1) Configure tetrapropyl ammonium hydroxide (TPAOH) solution as template agent, which is composed of SiO according to molar ratio 2 :TiO 2 :TPAOH:H 2 O=1.0:0.03:0.18:18 to prepare the titanium-silicon molecular sieve membrane:

[0031] First, TPAOH (20wt%) was mixed with water to form a solution A containing TPAOH mass fraction of 10.62%. 2 :TiO 2 The ratio of =1.0:0.03 selects tetraethyl orthosilicate (silicon source) and tetrabutyl titanate (titanium source) to mix to form solution B. Then solution B was slowly added to solution A and stirred for 30min, the mixed solution was hydrolyzed at 50°C and alcohol-driven until clarification; then a certain amount of alumina (titanium-silicon molecular sieve accounted for 10% of the total catalyst amount) %) was added to the solution and crystallized for 2 days in a homogeneous autoclave containing...

Embodiment 2

[0035] This embodiment provides the preparation of a modified titanium-silicon molecular sieve membrane catalyst, including:

[0036] (1) According to the preparation method of Example 1, by adjusting the mass ratio of the titanium-silicon molecular sieve membrane to the alumina carrier, a titanium-silicon molecular sieve membrane / alumina carrier B with a mass fraction of titanium-silicon molecular sieve of 20% was prepared.

[0037] (2) take by weighing the carrier B of two parts of equal quality, adopt equal volume dipping method to impregnate the aqueous solution of potassium dihydrogen phosphate of different concentrations, obtain P 2 O 5 The catalysts with equivalent percentages of 1% and 2% were then air-dried naturally, dried at 120°C for 24 hours, and calcined at 550°C for 4 hours. The numbers of the finally prepared catalysts were B1 / B2 respectively.

Embodiment 3

[0039] This embodiment provides the preparation of a modified titanium-silicon molecular sieve membrane catalyst, including:

[0040] (1) According to the preparation method of Example 1, by adjusting the mass ratio of the titanium-silicon molecular sieve membrane to the alumina carrier, a titanium-silicon molecular sieve membrane / alumina carrier C with a mass fraction of titanium-silicon molecular sieve of 30% was prepared.

[0041] (2) take by weighing the carrier C of two parts of equal quality, adopt equal volume dipping method to impregnate the aqueous solution of the potassium dihydrogen phosphate of different concentrations, obtain P 2 O 5 The catalysts with equivalent percentages of 1% and 2% were then air-dried naturally, dried at 120°C for 24 hours, and calcined at 550°C for 4 hours. The catalysts were finally prepared with the numbers C1 / C2.

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Abstract

The invention belongs to the technical field of catalyst preparation, and in particular relates to a catalyst for oxidizing propylene to prepare propylene oxide and its preparation and application. The modified titanium-silicon molecular sieve membrane catalyst is based on alumina as a carrier, and a titanium-silicon molecular sieve membrane is supported on the surface, wherein the surface of the titanium-silicon molecular sieve membrane is also loaded with P 2 o 5 . The modified titanium-silicon molecular sieve membrane catalyst has the characteristics of large effective specific surface area, high catalyst activity and good catalyst stability. 2 o 2 In the system, more effective active phases TiOO‑H(HPO 4 ), and finally the activity and stability of the catalyst are significantly improved compared with the existing titanium-silicon molecular sieve catalysts and titanium-silicon molecular sieve membrane catalysts.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a catalyst for preparing propylene oxide by oxidation of propylene and its preparation and application. Background technique [0002] Propylene oxide, alias methyl ethylene oxide, or propylene oxide (PO), is one of the three important basic organic chemical synthesis raw materials. Its output and consumption are second only to polypropylene, and it is the second largest derivative of propylene. It is mainly used for the production of polyether polyols, which are then processed into polyurethanes. The application fields of polyurethanes involve basic industries, national defense, and various aspects of people's daily life. It can also be used to produce chemical substances such as propylene glycol, propylene glycol ether, nonionic surfactants, flame retardants, etc. It has a wide range of applications in automobile, construction, food, tobacco, medicine an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/89C07D301/12C07D303/04
CPCB01J29/89C07D303/04C07D301/12B01J2229/18Y02P20/52
Inventor 李向伟高忠民
Owner BEIJING SINO SPHERE PETROCHEM TECH CO LTD
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