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Production process of ethyl acetate

An ethyl acetate and production process technology, applied in the field of ethyl acetate production technology, can solve the problems of increasing the energy consumption of a reactive distillation column, reducing the yield and purity of ethyl acetate products, and avoiding waste and improving the purity. , The effect of simplifying the production process

Active Publication Date: 2008-10-22
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This increases the energy consumption of reactive distillation column to a certain extent, and reduces the yield and the purity of ethyl acetate finished product

Method used

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  • Production process of ethyl acetate
  • Production process of ethyl acetate
  • Production process of ethyl acetate

Examples

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Embodiment 1

[0022] Embodiment 1. A kind of production technology of ethyl acetate

[0023] In this example, a tubular pervaporation membrane module is used, in which a self-made tubular composite membrane is used, the dense organic layer is polydimethylsiloxane, the thickness is 8 μm, and the effective membrane area is 12m 2, the porous support layer (Nanjing Jiusi Technology Co., Ltd., ceramic microfiltration membrane) has an average pore size of 0.5 μm and a thickness of 100 μm. The process conditions were calculated by using the chemical process simulation software Aspen Plus. Reactive distillation tower 1 is made of special stainless steel 316L, with 50 plates and a reflux ratio of 1.7. The feed rates of ethanol, acetic acid and concentrated sulfuric acid are 50kmol / h, 25kmol / h and 1.3mol / h respectively. Feed from the 35th, 5th and 9th trays respectively. The raw materials are sent to the reactive distillation column 1, the temperature at the top of the column is 75°C, the pressure ...

Embodiment 2

[0025] In this example, the dense film material of the top layer of the composite membrane that preferentially passes through organic matter is polydimethylsiloxane, and the thickness is 5 μm; 0.1μm, thickness 50μm, effective membrane area 5m 2 , all the other conditions are identical with embodiment 1, and the result is substantially consistent with embodiment 1.

Embodiment 3

[0027] In this example, the compact organic layer is polydimethylsiloxane with a thickness of 50 μm, and the porous support layer (Nanjing Jiusi High-Tech Co., Ltd., ceramic microfiltration membrane) has an average pore diameter of 10 μm and a thickness of 1000 μm. The effective membrane area is 25m 2 , all the other conditions are identical with embodiment 1, and the result is substantially consistent with embodiment 1.

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Abstract

The invention relates to a producing technology of ethyl acetate, the concrete steps of which are as follows: the acetic acid, concentrated sulphuric acid and ethanol of the reacting crude materials are transferred to a rectifying tower; the vapor distilled from the top of which enters into a sedimentation pond by a condenser after being condensed; an organic phase at the upper layer of the sedimentation pond is transferred to a treating column for refining; the water phase at the lower layer is transferred to a permeation vaporization film component by a heater after being heated to concentrate ethyl acetate with a low mass fraction; the material solution in the low stream of the film component is transferred to the treating column by a pump and the material solution which is degreased is discharged directly; the finished product of the ethyl acetate is obtained from the caldron of the treating column. The producing technology of the ethyl acetate brings the permeation vaporization technique into the producing process, recycles and concentrates the ethyl acetate with low mass fraction in the water solution to achieve the aim of simplifying the producing process, saving the investment of equipment, improving the purity and recycling of the products and preventing the environment from being polluted.

Description

technical field [0001] The invention relates to a production process of ethyl acetate. Specifically, the pervaporation technology is introduced into the production process, and ethyl acetate with a low mass fraction in the aqueous solution is recovered and concentrated, so as to simplify the production process, save equipment investment, and improve product quality. Purity and yield, the purpose of protecting the environment from pollution. Background technique [0002] Ethyl acetate is a very important chemical raw material. It is one of the most widely used fatty acid esters. It has excellent solubility and is a fast-drying solvent. It is widely used in coatings, inks, adhesives and pharmaceuticals. in organic synthesis. Since ethyl acetate can replace harmful solvents such as methyl ethyl ketone that emit volatile organic compounds into the air, it is expected that the global consumption of ethyl acetate will increase rapidly before 2010. At present, the domestic produc...

Claims

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Application Information

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IPC IPC(8): C07C69/12C07C67/08
Inventor 金万勤邢卫红毛凯相里粉娟徐南平
Owner NANJING UNIV OF TECH
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