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Method for preparing methyl propionate by taking methyl acetate as raw material

A technology of methyl acetate and methyl propionate, which is applied in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of low added value of products and small demand, and achieve wide application and broadening. Effects of downstream applications

Active Publication Date: 2021-03-09
SOUTHWEST RES & DESIGN INST OF CHEM IND
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Problems solved by technology

Although methyl acetate is also a kind of chemical raw material, the demand is small, and it is generally not sold as a by-product. At present, most of the industry is to hydrolyze methyl acetate into acetic acid and methanol, and obtain acetic acid and methanol after separation and purification, or as The product is sold, or reused in other processes or for personal use, and the added value of the product is low

Method used

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  • Method for preparing methyl propionate by taking methyl acetate as raw material

Examples

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Embodiment 1

[0022] Present embodiment is to take methyl acetate as raw material to prepare methyl propionate technological process such as figure 1 As shown, the specific process is as follows:

[0023] The shaped catalysts were loaded into the condensation reactor and the hydrogenation reactor respectively, and were all sprayed with H before use. 2 Activation, the activation conditions are: temperature 200°C, normal pressure, gas space velocity 500h -1 , Activation time 6h. Among them, the catalyst in the condensation reactor is to realize the aldol condensation reaction between methyl acetate and concentrated formaldehyde, the catalyst in the hydrogenation reactor is to realize the hydrogenation reaction of methyl acrylate, the composition and structure of the two catalysts And the type is not specifically limited, as long as the technical effects of aldol condensation and hydrogenation can be achieved, conventional catalysts in the field can be used.

[0024] Industrial-grade 37% di...

Embodiment 2

[0032] The whole preparation process is the same as in Example 1, only the aldol condensation reaction temperature is changed to 400°C.

[0033] In this embodiment, the conversion rate of methyl acetate is 55%, and the selectivity of methyl propionate is 83%.

Embodiment 3

[0035] The whole preparation process is the same as in Example 1, only the aldol condensation reaction pressure is changed to 3.0 bar.

[0036] In this embodiment, the conversion rate of methyl acetate is 45%, and the selectivity of methyl propionate is 95%.

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Abstract

The invention provides a method for preparing methyl propionate by taking methyl acetate as a raw material, and belongs to the technical field of preparation of methyl propionate. The method takes methyl acetate concentrated formaldehyde as a raw material, obtains a methyl propionate product through condensation, separation and purification and hydrogenation, and specifically comprises the following steps: introducing a reaction product obtained after aldol condensation of methyl acetate and concentrated formaldehyde into a methyl acetate tower, introducing a tower bottom material of the methyl acetate tower into a formaldehyde tower, extracting through the formaldehyde tower to obtain an organic phase material flow and a water phase material flow, enabling the organic phase material flowto enter a dehydration tower, enabling a tower bottom material of the dehydration tower to enter a methyl acrylate tower, and enabling a tower top material of the methyl acrylate tower to enter a hydrogenation reactor for hydrogenation reaction to obtain a methyl propionate product. The method is particularly suitable for producing methyl methacrylate which is rich in methyl acetate source, and can be used for producing methyl propionate that is relatively high in additional value and relatively wide in application by taking methyl acetate as a raw material, and the downstream application of methyl acetate is widened.

Description

technical field [0001] The invention belongs to the technical field of preparing methyl propionate, in particular to a method for preparing methyl propionate using methyl acetate as a raw material. Background technique [0002] Methyl acetate is a by-product of the production process of polyvinyl alcohol (PVA for short), and about 1.5 tons of methyl acetate is produced for every ton of polyvinyl alcohol produced. Although methyl acetate is also a kind of chemical raw material, the demand is small, and it is generally not sold as a by-product. At present, most of the industry is to hydrolyze methyl acetate into acetic acid and methanol, and obtain acetic acid and methanol after separation and purification, or as The product is sold, or reused in other processes or for personal use, and the added value of the product is low. Contents of the invention [0003] The object of the present invention is to provide a kind of method using methyl acetate as raw material to prepare m...

Claims

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Application Information

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IPC IPC(8): C07C67/343C07C69/54C07C67/347C07C69/24
CPCC07C67/343C07C67/347C07C69/54C07C69/24Y02P20/10
Inventor 赵国强王光永李军熊国焱谌晓玲
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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