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Process method for synthesizing ethyl acetate

The technology of an ethyl acetate and a process method is applied in the field of synthesizing ethyl acetate through a transesterification route of methyl acetate raw materials, which can solve the problems of loss of active components, poor stability of heterogeneous catalysts, etc., and achieves low production energy consumption, simple craftsmanship

Inactive Publication Date: 2021-01-05
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong acidity of acetic acid, the active components of solid catalysts such as solid-loaded heteropolyacids, solid superacids, and strongly acidic ion-exchange resins are lost, resulting in poor stability of heterogeneous catalysts, generally less than 200 hours

Method used

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  • Process method for synthesizing ethyl acetate
  • Process method for synthesizing ethyl acetate

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Such as figure 1 Shown, raw material methyl acetate and ethanol mol ratio are 3.5: 1, react 2 h in the reactor of the homogeneous sodium ethylate catalyst of 1% content after mixing, mixed product is sent to reaction-rectification tower through pumping, in Reaction - In the rectification column, the reaction is continued after separation. The temperature at the top of the rectification tower is 53.8 °C, and the produced components are 82% by mass of methyl acetate and 18% by mass of methanol. Cu-ZnO-Al is used for methyl acetate-methanol azeotrope between 180-250°C 2 o 3 The catalyst undergoes a hydrogenation reaction, and ethanol and methanol are obtained after simple separation. The ethanol is recycled to the reaction raw material, and methanol is a by-product with a purity higher than 99.9%. The reactive distillation column contains ethyl acetate with a content higher than 95%, methyl acetate with a content of about 4%, ethanol with a content of less than 1%, and ...

Embodiment 2

[0041] Such as figure 2 As shown, the raw material methyl acetate and ethanol molar ratio is 1:4, after mixing evenly, pass through the MgO fixed bed pre-reactor prepared by excessive sodium carbonate precipitation method, and the mixed product is pumped to the reaction-rectification tower, and the reaction- The formed solid MgO catalyst is filled in the rectification tower, which is separated in the reaction-rectification tower and then continues to react. The temperature at the top of the rectification tower is 53.8 °C, and the output component is 82% by mass of methyl acetate and 18% of methanol. Cu-ZnO-Al is used for methyl acetate-methanol azeotrope between 180-250°C 2 o 3Catalyst hydrogenation reaction, ethanol and methanol are obtained after rectification and separation, ethanol is recycled to the reaction raw materials, methanol is a by-product, and the purity is higher than 99.9%. At this time, the mass composition of the reaction-rectification tower still is abou...

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Abstract

A process method for synthesizing ethyl acetate is disclosed. The process method is a method for synthesizing ethyl acetate by an ester exchange route, and comprises the following steps: by taking methyl acetate and ethanol as raw materials, taking homogeneous sodium ethoxide or magnesium oxide (solid) precipitated by an excessive sodium carbonate method as a catalyst, and carrying out reactive distillation, low-boiling-point mixture separation and product distillation separation to obtain ethyl acetate with the purity higher than 99.9% and methanol with the byproduct purity higher than 99.9%.Compared with the traditional acetic acid and ethanol esterification method for producing ethyl acetate, the new process does not adopt a water-carrying agent and a strong acid catalyst, does not generate wastewater at all, and has the advantages of green and environment-friendly process and low production energy consumption, the highest temperature of the whole technological process is lower than 100 DEG C, the operation pressure is normal pressure or low vacuum degree, the whole requirement for equipment pipeline material selection is not strict, and the investment is low.

Description

technical field [0001] The invention relates to a method for preparing ethyl acetate, in particular to a process for synthesizing ethyl acetate through the transesterification route of methyl acetate raw material. Background technique [0002] Acetate is an important class of organic chemical products, often used as solvents and spices, and can be used in synthetic spices, cosmetics, food and feed additives, surfactants, anti-corrosion and anti-fungal agents, plasticizers for rubber and plastics, and in the pharmaceutical industry Common acetates include ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, isobutyl acetate, isoamyl acetate, benzyl acetate, etc. [0003] Ethyl acetate is a fine chemical product with a wide range of uses. It has excellent solubility and quick-drying properties and is widely used. It is a very important organic chemical raw material and an excellent industrial solvent. It is widely used in cellulose acetate, ethyl acetate In the pr...

Claims

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Application Information

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IPC IPC(8): C07C67/03C07C67/54C07C69/14C07C29/128C07C31/04B01J21/10B01J31/02
CPCB01J21/10B01J31/0212B01J2231/49C07C29/1285C07C31/04C07C67/03C07C67/54C07C69/14Y02P20/10Y02P20/52
Inventor 石磊许光文梁术王玉鑫
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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