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Cs-VPO/SiO2 catalyst, preparation method therefor and use of Cs-VPO/SiO2 catalyst in preparation of acrylic acid through catalyzing condensation of acetic acid and trioxymethylene

A technology of paraformaldehyde and catalysts, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, and the preparation of organic compounds. It can solve the problems of low price, complicated process, and overcapacity, and achieve good catalytic activity and stability. sexual effect

Inactive Publication Date: 2017-04-26
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex process and high investment, this method was difficult to be accepted by the industry.
However, at present, the domestic acetic acid and formaldehyde markets are overcapacitated and the prices are not high. The use of acetic acid and formaldehyde to produce acrylic acid has become a research hotspot.

Method used

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  • Cs-VPO/SiO2 catalyst, preparation method therefor and use of Cs-VPO/SiO2 catalyst in preparation of acrylic acid through catalyzing condensation of acetic acid and trioxymethylene
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  • Cs-VPO/SiO2 catalyst, preparation method therefor and use of Cs-VPO/SiO2 catalyst in preparation of acrylic acid through catalyzing condensation of acetic acid and trioxymethylene

Examples

Experimental program
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Effect test

preparation example Construction

[0021] Catalyst preparation:

[0022] Cs-VPO / SiO 2 The catalyst is prepared by an organic phase method: first weigh 1.5288g of vanadium pentoxide, add it to a three-necked flask, then add 60mL of isobutanol and 60mL of benzyl alcohol (V:V=1:1), stir and reflux at 140°C 6h, until the vanadium pentoxide is completely dissolved. According to the composition requirement of P / V=2.2 ratio in the catalyst, weigh 4.2555g of phosphoric acid with a mass fraction of 85%, slowly add it into the flask and then reflux for 6h; turn off the heating switch, according to the load P and V content accounted for 20% of the load % requirements, add 8g of SiO 2 , stirring; at the same time, according to the composition requirements of the catalyst, according to the molar ratio requirements of P / V / Cs=2.2 / 1 / 0.05, cesium carbonate is used as the cesium source, and the cesium carbonate aqueous solution with a concentration of 25 to 50 mg / mL is added to three ports In the flask, stir rapidly for 3 hou...

Embodiment 2

[0028] Same as Example 1, but the ratio of P / V / Cs in the catalyst was changed so that the P / V / Cs molar ratio was 2.2 / 1 / 0.1, and the obtained results are shown in Table 2.

[0029] Table 2. Cs-VPO / SiO 2 (P / V / Cs=2.2 / 1 / 0.1) catalyzed formaldehyde acetate to prepare acrylic acid result table

[0030]

Embodiment 3

[0032] Same as Example 1, but changing the ratio of P / V / Cs in the catalyst so that the P / V / Cs molar ratio is 2.2 / 1 / 0.2, the results are shown in Table 3.

[0033] Table 3. Cs-VPO / SiO 2 (P / V / Cs=2.2 / 1 / 0.2) catalyzed formaldehyde acetate to prepare acrylic acid result table

[0034]

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Abstract

The invention provides a Cs-VPO / SiO2 catalyst, a preparation method therefor and use of the Cs-VPO / SiO2 catalyst in preparation of acrylic acid through catalyzing condensation of acetic acid and trioxymethylene. The preparation method comprises the steps: (1) firstly, weighing vanadium pentoxide, adding the weighed vanadium pentoxide into a three-mouthed flask, then, adding isobutanol and benzyl alcohol into the three-mouthed flask, and carrying out constant-temperature stirring refluxing until the vanadium pentoxide is completely dissolved; and weighing phosphoric acid, slowly adding the weighed phosphoric acid into the flask, and then, continuing to carry out a constant-temperature refluxing reaction until the solution is dark blue, so as to obtain a vanadium-phosphorus oxide, i.e., VPO; and (2) adding SiO2 into the three-mouthed flask in the step (1), then, adding an aqueous solution of cesium carbonate into the three-mouthed flask, and carrying out a stirring reaction; and taking out a sample after the reaction is completed, carrying out suction filtration, carrying out washing with isobutanol and acetone, then, carrying out drying, grinding and roasting, tabletting the sample, and carrying out screening, thereby preparing the Cs-VPO / SiO2 catalyst. The Cs-VPO / SiO2 catalyst provided by the invention has the remarkable characteristic of having good catalytic activity and stability in a reaction process.

Description

technical field [0001] The present invention relates to a kind of Cs-VPO / SiO 2 The catalyst, its preparation method and the application of catalyzing the condensation of acetic acid and trioxane to prepare acrylic acid belong to the field of organic catalysis. Background technique [0002] Acrylic acid is one of the most important basic raw materials and intermediates of modern chemical industry. Because of its active polarity, unsaturated double bond and carboxylic acid structure, acrylic acid has excellent polymerization and esterification functions, and many kinds of acrylic acid can be derived Esters. Because the polymers produced by acrylic acid and its derivatives have good elasticity and viscosity, are stable to light and not easily weathered, they are widely used in coatings, adhesives, pulp treatment, glazing agents, leather, chemical fibers, detergents, petroleum, etc. fields such as mining and superabsorbent materials. [0003] Acrylic acid and esters have unde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/198C07C51/353C07C57/04
CPCB01J27/198C07C51/353C07C57/04
Inventor 胡靖王爱丽卢志鹏殷恒波
Owner JIANGSU UNIV
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