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Composite catalyst for manufacturing methacrylic acid and preparation method thereof

A technology of composite catalyst and methacrylic acid, which is applied in the direction of catalyst activation/preparation, carboxylate preparation, chemical instruments and methods, etc., can solve the problems of complex process conditions and high production costs, and achieve simple, easy-to-carry out, and good preparation methods. The effect of thermal stability

Pending Publication Date: 2022-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] One of the technical problems to be solved by the present invention is that the preparation of methacrylic acid by the oxidation of isobutylene requires two different component catalysts, high production costs, complex process conditions and other problems. It provides a composite catalyst for the production of methacrylic acid and its preparation method and application , that is, the first object of the present invention is to provide a composite catalyst for the production of methacrylic acid, the composite catalyst includes a two-component composite structure, can be used for one-step direct oxidation of isobutylene to produce methacrylic acid, has good catalytic activity and thermal stability sex

Method used

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  • Composite catalyst for manufacturing methacrylic acid and preparation method thereof
  • Composite catalyst for manufacturing methacrylic acid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] (1) Preparation of Mo-Bi system catalyst

[0081] 86.4g (NH 4 ) 6 Mo 7 o 24 4H 2 O was dissolved in deionized water to obtain solution I. 8.2gBi(NO 3 ) 3 ·5H 2 O, 70.5gNi(NO 3 ) 2 ·6H 2 O, 27.4gFe(NO 3 )3 9H 2 O, 8.5gCo(NO 3 ) 2 ·6H 2 O and 0.7 g CsNO 3 Dissolve in deionized water to obtain solution II. Mix solution I and solution II to obtain a mixed material, add 129.5 g of silica sol with a mass concentration of 40% to it, stir at a temperature of 120° C. at a stirring speed of 250 rpm for 40 minutes and boil to obtain slurry III. Slurry III was spray-dried at a drying temperature of 340°C and a drying time of 40 minutes. Finally, it was calcined at 600° C. for 3 h to obtain Mo-Bi system catalyst particles.

[0082] (2) Preparation of two-component composite catalyst

[0083] 92.1g H 3 PMo 12 o 40 Dissolve in deionized water, heat and reflux at 80°C and stir, then add 2.5g VOSO after dissolving 4 ,, continue to heat and reflux and stir for 30m...

Embodiment 2

[0090] (1) Preparation of Mo-Bi system catalyst

[0091] 57.6g (NH 4 ) 6 Mo 7 o 24 4H 2 O was dissolved in deionized water to obtain solution I. 8.2g Bi(NO 3 ) 3 ·5H 2 O, 56.4g Ni(NO 3 ) 2 ·6H 2 O, 21.9g Fe(NO 3 ) 3 9H 2 O, 6.8g Co(NO 3 ) 2 ·6H 2 O and 0.6gCsNO 3 Dissolve in deionized water to obtain solution II. Mix solution I and solution II to obtain a mixed material, add 103.6g of silica sol with a mass concentration of 30% to it, stir at a temperature of 120°C at a stirring speed of 250rpm for 40min and boil to obtain slurry III. Slurry III was spray-dried at a drying temperature of 340°C and a drying time of 40 minutes. Finally, it was calcined at 600° C. for 3 h to obtain Mo-Bi system catalyst particles.

[0092] (2) Preparation of two-component composite catalyst

[0093] 55.3g H 3 PMo 12 o 40 Dissolve in deionized water, heat and reflux at 80°C and stir, then add 2.0g VOSO after dissolving 4 , continue to heat and reflux and stir for 30 min to...

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Abstract

The invention provides a catalyst for directly preparing methacrylic acid by taking isobutene as a raw material through a one-step method and a preparation method of the catalyst. The catalyst comprises two different active components, namely Mo-Bi metal oxide and mesoporous Mo-P heteropolyacid, and can selectively oxidize isobutene into methylacrolein and further oxidize methylacrolein into methacrylic acid respectively. The preparation method of the catalyst comprises two steps: after Mo-Bi metal oxide particles are prepared, dispersing the Mo-Bi metal oxide particles in a Mo-P heteropolyacid precursor solution containing a surfactant and a silicon dioxide precursor to obtain the composite catalyst. The heat treatment method of the catalyst is also divided into two steps, that is, roasting is carried out in inert gas and oxidizing gas atmospheres respectively, and finally the catalyst with good heat stability is obtained. The catalyst can directly oxidize isobutene into methacrylic acid by a one-step method, and has good reaction activity and thermal stability.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a composite catalyst for methacrylic acid production, a preparation method and application thereof. Background technique [0002] Methyl methacrylate (MMA) is a very important organic chemical raw material and chemical product, which can be used to produce polymethyl methacrylate PMMA, polyvinyl chloride additives, etc., and can also be used in lubricants, coatings, adhesives, etc. In recent years, MMA has also been widely used in high-tech fields such as optical fibers, optical discs, and lenses. The process of obtaining methacrylic acid through the two-step oxidation method of C4 raw materials such as isobutene, isobutane or tert-butanol through different catalysts, and further esterifying to produce methyl methacrylate is the current preparation method due to its low environmental pollution and low process cost. One of the main methods of methyl methacrylate. [0003] At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31B01J31/18B01J27/199B01J35/10B01J31/34B01J23/887C07C51/25C07C57/04
CPCB01J23/31B01J23/8876B01J27/199B01J31/34C07C51/25B01J23/002B01J37/0009B01J37/0018B01J2523/00B01J35/19B01J35/613B01J35/615B01J35/647B01J2523/15B01J2523/41B01J2523/54B01J2523/68B01J2523/842B01J2523/845B01J2523/847
Inventor 万里李静霞
Owner CHINA PETROLEUM & CHEM CORP
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