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Production method of methyl acrylate

A technology for the production of methyl acrylate, which is applied to the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds, and can solve the problems of increased production costs of methyl acrylate, poor control of reaction conditions, and product polymerization. Achieve the effect of high selectivity, easy preparation and less by-products

Inactive Publication Date: 2013-08-14
ZHUHAI FEIYANG NOVEL MATERIALS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as one of the main raw materials of petrochemical industry, the price of propylene has been greatly fluctuated by the international oil price in recent years, resulting in a gradual increase in the production cost of methyl acrylate
[0004] At present, there is a surplus of methyl acetate in China, but no one uses methyl acetate and formaldehyde to prepare methyl acrylate in industrial production. The reason may be that the reaction conditions are not well controlled, and when the reaction conditions are slightly severe, the product will be polymerized.

Method used

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  • Production method of methyl acrylate
  • Production method of methyl acrylate
  • Production method of methyl acrylate

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Experimental program
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Effect test

Embodiment 1

[0018] Embodiment one discloses the production method of methyl acrylate, and the reaction equation is:

[0019]

[0020] In the autoclave, add 300mL of methyl acetate and 90g of formaldehyde, then add 1g of basic ionic liquid - hydroxide type 1-butyl-3-methylimidazolium salt, 5mL of ethylenediamine and 2g of thiaphenazine, Control the reaction temperature between 170 and 175°C, the reaction pressure is about 3MPa, stir the reaction for 6h, and then rectify to obtain methyl acrylate. Calculated as methyl acetate, the yield of methyl acrylate is 20.3%, and the selectivity is 85.2%. .

[0021] In other embodiments, the mass ratio range of the reaction raw material methyl acetate to formaldehyde is 1.0 to 2.0; the mass ratio range of the basic ionic liquid to ethylenediamine is 0.1 to 1.0; the mass ratio of the basic ionic liquid to ethylenediamine and The ratio range of the mass of the reaction raw materials is 1.0% to 5.0%; the mass ratio range of the polymerization inhibit...

Embodiment 2

[0023] Embodiment two discloses the production method of methyl acrylate, and reaction equation is:

[0024]

[0025] In the autoclave, add 350mL of methyl acetate and 100g of formaldehyde, then add 4g of basic ionic liquid-hydroxide type 1-butyl-3-methylimidazolium salt, 10mL of ethylenediamine and 4g of thiaphenazine, Control the reaction temperature between 180 and 185°C, the reaction pressure is about 4MPa, stir the reaction for 8 hours, and then rectify to obtain methyl acrylate. Calculated as methyl acetate, the yield of methyl acrylate is 26.3%, and the selectivity is 78.8%. .

Embodiment 3

[0027] Embodiment three discloses the production method of methyl acrylate, and the reaction equation is:

[0028]

[0029] In the autoclave, add 300mL methyl acetate and 70g formaldehyde, then add 1g basic ionic liquid——hydroxide-type 1-butyl-3-methylimidazolium salt, 10mL ethylenediamine and 2g thiaphenazine, Control the reaction temperature between 160 and 165 ° C, the reaction pressure is about 3 MPa, stir for 8 hours, and then rectify to obtain methyl acrylate. Calculated as methyl acetate, the yield of methyl acrylate is 19.3%, and the selectivity is 90.4%. .

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Abstract

The invention discloses a production method of methyl acrylate. The production method comprises the following steps of: by using methyl acetate and formaldehyde as raw materials and adopting an alkaline ionic liquid and ethanediamine as an alkaline compound catalyst, adding an appropriate amount of polymerization inhibitor; controlling the reaction temperature at 140-200 DEG C and the reaction pressure at 2-10Mpa; and stirring and reacting to obtain methyl acrylate. According to the production method of methyl acrylate, methyl acrylate is synthesized by methyl acetate and formaldehyde as raw materials which are cheap and available. The reaction is direct, the product is simple to separate, the byproducts are less compared with those in the prior art, and the energy consumption for production is reduced. Compared with the existing two-step method by which acrylic acid and methanol are directly esterified, the production cost is low, and the catalyst is simple and convenient to prepare and further cheap and easy to obtain. In the reaction process, the polymerization inhibitor phenothiazine is used, so that methyl acrylate is industrially produced based on methyl acetate and formaldehyde as raw materials.

Description

technical field [0001] The invention relates to a chemical synthesis process, in particular to a production method of methyl acrylate. Background technique [0002] Methyl acrylate is an important synthetic intermediate and a monomer for the synthesis of polymers, widely used in rubber, medicine, leather, paper, adhesives and coatings industries. [0003] The industrial production method of methyl acrylate is generally obtained by direct esterification of acrylic acid and methanol, and the preparation of acrylic acid is currently mainly the oxidation of propylene. That is, the production method of methyl acrylate is mainly a two-step method: the first step is the preparation of acrylic acid, that is, the propylene oxidation method, which was first built by the Union Carbide (UCC) company in the United States in 1969. The first set of production equipment, followed by Japan Catalyst Chemical Corporation (1970), Mitsubishi Chemical Corporation (1973) and American Celanese Cor...

Claims

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Application Information

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IPC IPC(8): C07C69/54C07C67/343
Inventor 肖阳谢成彭威
Owner ZHUHAI FEIYANG NOVEL MATERIALS