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A kind of preparation method of isopropyl acetate

A technology of isopropyl acetate and acetic acid, which is applied in the field of preparation of isopropyl acetate, can solve the problems of high separation energy consumption and complicated separation process, and achieve the effects of simplifying the process, reducing production costs, and saving device energy consumption

Active Publication Date: 2021-06-18
HUIZHOU YUSSEN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separation process of this method is relatively complicated, and the separation energy consumption is relatively high.

Method used

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  • A kind of preparation method of isopropyl acetate

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Comparison scheme
Effect test

Embodiment 1

[0043] Propylene (90.7% by weight of propylene, 9.3% by weight of propane) and acetic acid raw materials are mixed and added to a fixed-bed reactor, and isopropyl acetate is synthesized under the action of a cation exchange resin catalyst. The reaction conditions are: reaction temperature 30°C, reaction The pressure is 0.5 MPa, and the molar ratio of acetic acid to propylene is 1.0. After the reaction mixture is preheated, it is sent to the light removal tower for separation. The operating conditions of the light removal tower are: the temperature at the top of the light removal tower is 140°C, the pressure at the top of the tower is 0.65MPa, the temperature at the bottom of the tower is 175°C, and the pressure at the bottom of the tower is 0.66MPa. After the tower top gas phase is extracted and condensed, the isopropyl acetate is fully refluxed into the light removal tower to remove condensed water, and the unreacted propylene and propane are discharged in the form of non-cond...

Embodiment 2

[0045] Propylene (93.51% by weight of propylene, 4.06% by weight of propane, 1.51% by weight of ethane, and 0.92% by weight of butane) is mixed with acetic acid raw materials into a fixed-bed reactor, and synthesized under the action of a heteropolyacid resin catalyst Isopropyl acetate, the reaction conditions are: reaction temperature 110°C, reaction pressure 2.5MPa, molar ratio of acetic acid to propylene is 10.0. After the reaction mixture is preheated, it is sent to the light removal tower for separation. The operating conditions of the light removal tower are: the temperature at the top of the light removal tower is 110°C, the pressure at the top of the tower is 0.35MPa, the temperature at the bottom of the tower is 155°C, and the pressure at the bottom of the tower is 0.36MPa. After the tower top gas phase is extracted and condensed, the isopropyl acetate is fully refluxed into the light removal tower to remove condensed water, and the unreacted propylene, propane and eth...

Embodiment 3

[0047] Propylene (99.53% by weight of propylene, 0.47% by weight of propane) and acetic acid raw materials are mixed and added into a fixed-bed reactor, and isopropyl acetate is synthesized under the action of a cation exchange resin catalyst. The reaction conditions are: reaction temperature 50°C, reaction The pressure is 0.65MPa, and the molar ratio of acetic acid to propylene is 2.0. After the reaction mixture is preheated, it is sent to the light removal tower for separation. The operating conditions of the light removal tower are: the temperature at the top of the light removal tower is 120°C, the pressure at the top of the tower is 0.50MPa, the temperature at the bottom of the tower is 165°C, and the pressure at the bottom of the tower is 0.56MPa. After the top gas phase is extracted and condensed, the isopropyl acetate is fully refluxed into the light removal tower to remove condensed water, unreacted propylene and propane are discharged in the form of non-condensable ga...

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Abstract

The invention discloses a preparation method of isopropyl acetate, which comprises the steps of completing the catalytic synthesis reaction of propylene and acetic acid in a fixed-bed reactor; the reacted mixture is sent to a light removal tower after being preheated, and isopropyl acetate, water, Propylene is extracted from the top of the tower, and after condensation, the isopropyl acetate is fully refluxed into the light removal tower, the condensed water is discharged, propylene is discharged in the form of non-condensable gas, and the mixture of acetic acid and isopropyl acetate is extracted from the tower kettle And after heat exchange with the reacted mixture, it is sent to the product separation tower; acetic acid and isopropyl acetate are separated in the product separation tower, and part of the top material is refluxed into the separation tower after condensation, and a part is extracted as isopropyl acetate product , Acetic acid is withdrawn from the side line of the tower reactor and returned to the fixed bed reactor for recycling, and C9 olefins and C12 olefins are removed from the tower reactor as heavy components. The preparation method of isopropyl acetate of the present invention has the advantages of mild reaction conditions, simple product separation process and low energy consumption.

Description

technical field [0001] The present invention relates to the technical field of compound, relate in particular to a kind of preparation method of isopropyl acetate. Background technique [0002] Isopropyl acetate is a colorless transparent liquid with a fruity aroma. It is one of the edible flavors allowed in China's GB2760-86. Because of its volatility, it is miscible with most organic solvents such as alcohols, ketones, ethers, etc., so it is called a universal solvent. Mainly used as paint, printing ink solvent, industrial dehydrating agent, extractant in pharmaceutical production and fragrance components, etc. [0003] The traditional isopropyl acetate production process is to carry out esterification reaction of acetic acid and isopropanol under the action of concentrated sulfuric acid catalyst, and then go through processes such as separation, neutralization, precipitation and rectification to obtain isopropyl acetate product. However, this process has problems such a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/14C07C67/04C07C67/54
CPCC07C67/04C07C67/54C07C69/14
Inventor 秦子轩湛明石象鹏夏志强胡先念
Owner HUIZHOU YUSSEN CHEM CO LTD
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