Energy-saving method for preparing isopropyl acetate

A technology of isopropyl acetate and methyl acetate, applied in the field of chemical reaction engineering, can solve the problems of long post-treatment process, shortened reaction process, accumulation of olefin oligomers, etc.

Inactive Publication Date: 2015-11-04
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] There are mainly two kinds of production techniques for synthesizing isopropyl acetate at present, and a kind of method is exactly that acetic acid and isopropanol are raw materials, under the effect of strong acid catalyst direct esterification generates isopropyl acetate, as the method disclosed in CN103214367, this The method uses concentrated sulfuric acid as a catalyst, because the catalyst is easy to get and the price is low, but its main disadvantages are that the device is easy to corrode, easy to pollute the environment, and the product is complicated and difficult to separate. After the reaction, water of equimolar mass is p

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  • Energy-saving method for preparing isopropyl acetate

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Effect test

Embodiment 1

[0023] Attached figure 1 As shown in the process flow, the pressurized reaction distillation column C1 is a plate tower with a diameter of 700 mm and a height of 30 meters, with 50 trays inside; among them, there are 9 plates in the rectification section, 36 plates in the reaction section, and 5 plates in the stripping section. plate. The operating pressure is 3atm, the operating reflux ratio is 2.3, the temperature of the bottom of the tower is 126-128°C, and the temperature of the top of the tower is 86-88°C.

[0024] Virahol enters the upper part of the reaction section 2 of the pressurized reactive distillation column C1 through the feed pipe S01 at a rate of 300.5kg / h, and methyl acetate reclaims with methyl acetate at a rate of 370.4kg / h through S02 The 359.6kg / h circulating material extracted from the circulation pipe S10 at the top of the tower C2 is mixed and then enters the lower part of the reaction section 2 of the pressurized reaction distillation column C1, and ...

Embodiment 2

[0028] Attached figure 1 In the process flow shown, the pressurized reactive distillation column C1 has a diameter of 800 mm, 25 meters of structured packing inside, and 60 theoretical plates; among them, there are 12 plates in the rectification section, 41 plates in the reaction section, and 7 plates in the stripping section. The operating pressure is 2.5 atm, the operating reflux ratio is 1.9, the temperature at the bottom of the tower is 118-121°C, and the temperature at the top of the tower is 81-83°C.

[0029] Virahol enters the upper part of the reaction section 2 of the pressurized reactive distillation column C1 through the feed pipe S01 at a rate of 300.5kg / h, and methyl acetate comes from the normal through the feed pipe S02 and through S10 at a rate of 370.4kg / h. The 449.5kg / h circulating material at the top of the pressurized methyl acetate recovery tower C2 is mixed and then enters the lower part of the reaction section 2 of the pressurized reaction distillation c...

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Abstract

The invention belongs to the field of chemical reaction engineering and relates to a production method for isopropyl acetate, particularly an energy-saving process for preparing isopropyl acetate by reacting-distillation of methyl acetate and isopropanol. By taking methyl acetate and isopropanol as raw materials, the raw materials are prepared and recovered by reaction of a pressurized reaction rectifying tower and a normal pressure methyl acetate recovery tower, and the reaction of synthesizing isopropyl acetate in the pressurized reaction rectifying tower by virtue of a transesterification method is a pressurized reaction, so that the composition of a binary azeotrope formed by a reaction product methanol and the raw material methyl acetate is changed, the content of methyl acetate in the azeotrope is reduced, and the produced quantity at the tower top is reduced, and therefore, the equipment investment on the normal pressure methyl acetate recovery tower is reduced. The steam temperature of the binary azeotrope of methanol and methyl acetate in a rectifying section at the tower top of the pressurized reaction rectifying tower is enhanced, heat of a kettle reboiler is provided for the normal pressure methyl acetate recovery tower, and the pressurized reaction rectifying tower and the normal pressure methyl acetate recovery tower realize the purpose of saving energy and reducing consumption through heat integration.

Description

technical field [0001] The invention belongs to the field of chemical reaction engineering, and relates to a production method of ethyl isopropyl ester, in particular to an energy-saving process for preparing isopropyl acetate by reactive distillation of methyl acetate and isopropanol. Background technique [0002] Isopropyl acetate is an important carboxylate product, which is widely used; it is a raw material for synthetic resins and coatings, and can also be used as a component of certain perfumes, dehydrating agents, solvents for coatings, and solvents for printing inks , and can be used as an extractant in some pharmaceutical synthesis processes. Isopropyl acetate is known as a "universal solvent" and can be miscible with organic solvents such as alcohols, ketones, and ethers. [0003] There are mainly two kinds of production techniques for synthesizing isopropyl acetate at present, and a kind of method is exactly that acetic acid and isopropanol are raw materials, unde...

Claims

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Application Information

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IPC IPC(8): C07C69/14C07C67/03C07C67/54
CPCC07C67/03C07C67/54C07C69/14Y02P20/10
Inventor 叶青索潇萌李睿吴卫忠
Owner CHANGZHOU UNIV
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