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Catalyst for synthesizing methyl acrylate by trioxymethylene or paraformaldehyde and acetic acid and acetic acid aqueous solution, its preparation and its application method

An aqueous solution of acetic acid, methyl acrylate technology, applied in the preparation of carboxylate, the preparation of organic compounds, chemical instruments and methods, etc., to achieve the effects of low requirements, improved solubility, and energy saving

Inactive Publication Date: 2014-03-19
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current average operating rate of acetic acid plants is only 60%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: Taking silicon dioxide as a carrier, the preparation of a catalytic material taking cesium as an alkali metal element

[0026] Take a certain amount of pure lactic acid in a 200mL beaker, add a certain amount of deionized water according to the mass fraction of 30%, stir and mix evenly, seal it with plastic wrap, and heat to 70°C; weigh a certain amount of ammonium metavanadate and dissolve it in the previously prepared In the hot lactic acid solution, fully dissolve to obtain a dark blue solution; add the calculated cesium nitrate, after fully dissolved, add the quantitatively calculated pure phosphoric acid, stir fully to make the reaction complete, until no bubbles are generated, and obtain the impregnating solution; take 10g20 - 40 mesh silica particles, add the prepared impregnating solution, impregnate for 3 hours, evaporate excess water in a water bath, place in an oven, and dry at 150°C for 6 hours to obtain a dry impregnated body.

[0027] Put the...

Embodiment 2

[0028] Embodiment 2: take silicon dioxide as carrier, take magnesium as the preparation of the catalytic material of alkali metal element

[0029] The preparation method of the catalytic material of this example is the same as that of Example 1, the difference is that the alkali metal salt used is magnesium carbonate, and after the final roasting treatment, a silica-supported vanadium pentoxide-phosphorus pentoxide-magnesia composite Catalytic materials, wherein vanadium element accounts for 15% of the total mass of the catalytic material, phosphorus element accounts for 10% of the total mass of the catalytic material, and magnesium element accounts for 2% of the total mass of the catalytic material, changing the addition of ammonium metavanadate, phosphoric acid and magnesium carbonate , can prepare catalytic materials with different loadings.

Embodiment 3

[0030] Embodiment 3: Taking Al2O3 as a carrier, the preparation of a catalytic material with cesium as an alkali metal element

[0031] The preparation method of the catalytic material in this example is the same as in Example 1, the difference is that the carrier used is aluminum oxide, and after the final roasting treatment, aluminum oxide-loaded vanadium pentoxide-phosphorus pentoxide-cesium oxide is obtained Composite catalytic material, wherein the vanadium element accounts for 15% of the total mass of the catalytic material, the phosphorus element accounts for 10% of the total mass of the catalytic material, and the cesium element accounts for 2% of the total mass of the catalytic material, changing the addition of ammonium metavanadate, phosphoric acid and cesium nitrate Catalytic materials with different loadings can be prepared.

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PUM

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Abstract

The invention discloses a catalyst for synthesizing methyl acrylate by trioxymethylene or paraformaldehyde and acetic acid and acetic acid aqueous solution, its preparation and its application method. The catalyst uses lactic acid to dissolve ammonium metavanadate, one or more than one alkali metal salt and phosphoric acid can be added for preparing a dipping liquid, a step of roasting is carried out to form the compound catalyst which takes silicon dioxide, alumina, active carbon or molecular sieve as carriers and is loaded with a vanadic anhydride-phosphoric pentoxide-alkali metal oxide. The load capacity of the vanadium element accounts for 5-20% of total mass of the catalyst, the mass ratio of phosphor to vanadium is 0.5-4, and the alkali metal element accounts for 1-5% of total mass of the catalyst. The preparation step of the catalyst comprises the steps of configuring the dipping liquid, dipping the carriers, drying, and heating and roasting the dipping body. According to the invention, a fixed bed reactor is employed, methyl acrylate is continuously produced under suitable reaction condition, one way conversion rate of formaldehyde can reach 40%, and the selectivity of methyl acrylate can reach 55%.

Description

technical field [0001] The invention belongs to the field of preparation technology and application of catalytic materials, and relates to the reaction of paraformaldehyde or paraformaldehyde with acetic acid and acetic acid aqueous solution to synthesize methyl acrylate, using silicon dioxide, aluminum oxide, activated carbon or molecular sieve as a carrier, and carrying pentoxide A composite catalyst of diphosphorus, vanadium pentoxide and one or more than two kinds of alkali metal oxides and a preparation method thereof, particularly a method for preparing an impregnating solution by dissolving ammonium metavanadate with lactic acid as a solvent for the catalytic material, and The prepared composite catalytic material is used for the reaction of synthesizing methyl acrylate from paraformaldehyde or paraformaldehyde, acetic acid and acetic acid aqueous solution. Background technique [0002] Acrylate is an important class of chemical raw materials with a wide range of uses...

Claims

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Application Information

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IPC IPC(8): B01J27/198C07C69/54C07C67/00
Inventor 李春山杨丹李聃张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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