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Preparation method of acrolein

A technology of acrolein and propane, applied in the field of selective oxidation of propane to acrolein, which can solve the problems of low catalytic activity, high local hot spots, poor mechanical strength, etc.

Active Publication Date: 2021-12-21
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The technical problem to be solved by the present invention is that the catalysts in the prior art tend to have many problems such as too high local hot spots, poor mechanical strength, low catalytic activity, poor repeatability and selectivity during the tube-and-tube fixed bed reaction process, and provide a A new method of propane oxidation to acrolein

Method used

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  • Preparation method of acrolein
  • Preparation method of acrolein
  • Preparation method of acrolein

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The first step: preparation of catalyst slurry a1 of the present invention by dissolution-co-precipitation method

[0049] Add 100 g of ammonium molybdate, 9.57 g of ammonium metavanadate, 18.42 g of telluric acid and 20 mL of water into the No. 1 beaker, stir the mixture at 78 ° C to dissolve it, add 56.46 g of niobium oxalate and 20 mL of distilled water in the No. 2 beaker Stir at 78°C to make it dissolve, then slowly add the solution in No. 2 beaker to No. 1 beaker dropwise, continue to add distilled water to 80mL, and react at normal pressure for 1h to prepare a multi-component composite metal oxide catalyst slurry a1.

[0050] Step 2: Preparation of Nanocluster Directing Agent b1

[0051] Tetrabutyl titanate (Ti(OC 4 h 9 )), orthoethylsilicate (TEOS), tetrapropylammonium hydroxide (TPAOH) and deionized water in a molar ratio of: n(TiO 2 ): n(SiO 2 ):n(TPAOH):n(H 2 O)=1.0:20:8:1500 Mix evenly, react in a constant temperature water bath cup at 35°C for a certa...

Embodiment 2

[0060] The first step: preparation of catalyst slurry a2 of the present invention by dissolution-co-precipitation method

[0061] Referring to the method of the first step in Example 1, wherein the reaction time of the mixed solution is 50min, the composite metal oxide catalyst slurry a2 containing multiple components is obtained.

[0062] The second step: preparation of nanocluster directing agent b2

[0063] In embodiment 1, n-tetrabutyl titanate Ti(OC 4 h 9 ), TEOS, tetrapropylammonium hydroxide TPAOH and deionized water molar ratio changed to: n(TiO 2 ): n(SiO 2 ):n(TPAOH):n(H 2 (0)=1.0:30:8:1500, the temperature of the reaction water bath was 40° C., crystallized at 140° C. for 2 hours, and the nanocluster directing agent b2 was prepared referring to the second step of Example 1.

[0064] The third step: preparing the mesoporous-microporous molecular sieve c2 of the present invention

[0065] The reaction condition was changed to 80° C. for 20 h in a constant temper...

Embodiment 3

[0070] The first step: preparation of catalyst slurry a3 of the present invention by dissolution-co-precipitation method

[0071] With reference to the method of the first step in Example 1, wherein the reaction time of the mixed solution is 1.5h, the multi-component composite metal oxide catalyst slurry a3 is prepared.

[0072] The second step: preparation of nanocluster directing agent b3

[0073] Tetrabutyl titanate Ti(OC 4 h 9 ), tetrapropylammonium hydroxide TPAOH and deionized water molar ratio changed to: n(TiO 2 ): n(SiO 2 ):n(TPAOH):n(H 2 (0)=1.0:60:8:1500, reacted in a water bath at 45° C. and crystallized at 140° C. for 3 hours. Refer to the second step of Example 1 to prepare nanocluster directing agent b3.

[0074] The third step: preparing the mesoporous-microporous molecular sieve c3 of the present invention

[0075] Referring to the third step of Example 1, molecular sieve slurry c3 was prepared: the reaction condition was changed to 100° C. for 10 h in a...

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Abstract

The invention relates to a preparation method of acrolein, which adopts a slurry bed reactor, wherein reaction raw materials enter the reactor after being preheated and vaporized, pass through a slurry layer with suspended catalyst fine particles in a bubbling form, and are in contact reaction with a catalyst to prepare acrolein. The catalyst comprises multi-metal oxides such as Mo-V-Te-Nb and the like, the catalyst is prepared by a loading method, and a carrier is a mesoporous-microporous composite Ti-Si molecular sieve synthesized by a nano-cluster assembly method. The production method has the characteristics of high propane conversion rate, high acrolein selectivity and the like.

Description

technical field [0001] The invention relates to a method for producing unsaturated aldehyde by selective oxidation of propane, and is especially suitable for the preparation method of selective oxidation of propane to acrolein. Background technique [0002] Acrolein is a simple unsaturated aldehyde, chemically active, and is an important chemical intermediate. At present, its largest market application is the preparation of animal feed additive methionine, and it can also be used to synthesize picoline, pyridine, glutaraldehyde, Important chemical products such as glycerin and acrylic acid. In addition, it can also be used as an important raw material for the synthesis of 1,3-propanediol. 1,3-Propanediol is one of the main raw materials for the production of polytrimethylene terephthalate (PTT). It can also be used as As a raw material for synthetic plasticizers, detergents, preservatives, and emulsifiers, PTT fiber has excellent performance and has great market prospects, b...

Claims

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Application Information

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IPC IPC(8): B01J29/89C07C45/33C07C47/22
CPCB01J29/89C07C45/33B01J2229/186C07C47/22
Inventor 杨红强刘肖飞南洋何崇慧李燕全民强黄鑫魏珍妮牛承祥边虎
Owner PETROCHINA CO LTD
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