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Method for preparing methyl acrylate

A technology of methyl acrylate and methyl acetate, which is applied in the field of preparation of chemical raw materials, and can solve problems such as low product yield and easy deactivation of catalysts

Inactive Publication Date: 2017-06-13
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years with C 3 The synthesis of methyl acrylate as raw material through aldol condensation reaction has become a kind of green production process that researchers have paid close attention to. Among them, propionic acid is used as raw material to synthesize methyl acrylate. The efficiency is not high, the catalyst is easy to deactivate and other problems, and it is only in the research and patent stage.

Method used

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  • Method for preparing methyl acrylate
  • Method for preparing methyl acrylate
  • Method for preparing methyl acrylate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The mixed gas of paraformaldehyde and methyl acetate passed through the reactor loaded with 100 g of solid catalyst at a temperature of 360 °C and a pressure of 0.5 MPa. The reaction time is 100 h. The reaction results are shown in Table 1:

[0034] Table 1 Effect of different aldehyde-ester ratios on the conversion of methyl acetate

[0035]

[0036] It can be seen from Table 1 that as the molar ratio of aldehyde to ester increases, the conversion rate of methyl acetate also increases. When the molar ratio of aldehyde to ester is 1.2:1, the conversion rate of methyl acetate is 99.98%, which is close to complete conversion. When the molar ratio of aldehyde to ester (0.8:1, 0.9:1, 1:1) gradually increased, the selectivity of MA also gradually increased. When the molar ratio of aldehyde to ester was 1:1, the conversion rate of methyl acetate was 99.44%. When the molar ratio of aldehyde to ester (1.1:1, 1.2:1) gradually increased, the selectivity of MA decreased gradu...

Embodiment 2

[0038]A mixture of methylal, paraformaldehyde and methyl acetate (molar ratio 0.2:1:1) was passed through a reactor loaded with 100 g of solid catalyst at a pressure of 0.5 MPa. The reaction time was 100 h, and the reaction temperatures were 300, 320, 340, 360, 380, and 400 °C, respectively. The reaction results are shown in Table 2:

[0039] The influence of table 2 different reaction temperatures on methyl acetate conversion rate

[0040]

[0041] According to Table 2, it can be seen that with the increase of temperature, the conversion rate of methyl acetate increases continuously. When the reaction temperature is 400°C, the conversion rate of methyl acetate is 99.99%, which is close to complete conversion. When the temperature (300, 320, 340, 360 ℃) gradually increased, the selectivity of the main product MA gradually increased, and when the temperature was 360 ℃, the MA selectivity reached the maximum value of 91.23%. After that, the reaction temperature (380, 400°C)...

Embodiment 3

[0043] The mixed gas of methylal, tetrapolyoxymethylene and methyl acetate (molar ratio 0.2:1:1) was passed through the reactor loaded with 100 g of solid catalyst under the condition of 0.5 MPa. The reaction time was 100 h, and the reaction temperatures were 300, 320, 340, 360, 380, and 400 °C, respectively. The reaction results are shown in Table 3:

[0044] The influence of table 3 different reaction temperatures on the conversion rate of methyl acetate

[0045]

[0046] According to Table 3, it can be seen that with the increase of temperature, the conversion rate of methyl acetate increases continuously. When the reaction temperature is 400°C, the conversion rate of methyl acetate is 99.99%, which is close to complete conversion. When the temperature (300, 320, 340, 360 ℃) gradually increased, the selectivity of the main product MA gradually increased, and when the temperature was 360 ℃, the MA selectivity reached the maximum value of 91.21%. After that, the reaction...

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Abstract

The invention provides a method for preparing methyl acrylate and relates to a preparation method for chemical materials. The method comprises the following steps: taking methylal as a solvent, taking trioxymethylene, polyformaldehyde, paraformaldehyde or one or more of paraformaldehyde mixture and methyl acetate as reaction raw materials and passing by a reaction zone loaded with a solid base catalyst; separating the effluent of the reaction zone, wherein methyl acrylate is a product, dimethyl ether is a side product and water is a side product; returning at least one part of the side product to the reaction zone and circularly converting; and returning the unreacted raw materials, namely, methyl acetate or trioxymethylene, polyformaldehyde, paraformaldehyde or one or more of paraformaldehyde mixture, into the reaction zone and circularly converting. The preparation process is simple; the raw material source is convenient; the side products are few; and after reaction, the treatment is simple and convenient and the environmental pollution is less. A new thought and a new method are supplied for the large-scale industrial production.

Description

technical field [0001] The invention relates to a method for preparing chemical raw materials, in particular to a method for preparing methyl acrylate. Background technique [0002] Methyl acrylate (MA for short), also known as methyl acrylate. Methyl acrylate is widely used in medicine, leather, papermaking and other fields because of its polymerization reaction. Therefore, methyl acrylate has a wide range of applications in organic synthesis and polymer fields. In terms of coatings and adhesives, it is mainly a monomer for synthesizing polymers, mainly used as the second monomer of acrylic fibers; in the application fields of plastics and adhesives, it is used as the second monomer of acrylic fibers; in leather, it is used with acrylic fibers The emulsion formed by the copolymerization of methyl ester can better improve the quality of leather. Therefore, methyl acrylate is a chemical product with high added value and great development prospects. The methyl acrylate indu...

Claims

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Application Information

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IPC IPC(8): C07C67/343C07C69/54B01J23/04
CPCC07C67/343B01J23/04C07C69/54
Inventor 石磊张冬喜王岩姚杰李新钰
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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