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Method and apparatus for synthesis of isopropyl acetate

A technology of isopropyl acetate and acetic acid, applied in the field of synthesis of isopropyl acetate and its device, can solve the problems of high energy consumption and equipment investment, low thermodynamic efficiency, back-mixing of intermediate components, etc., to reduce energy consumption and The effect of equipment investment cost, simplifying distillation process and improving reaction conversion rate

Inactive Publication Date: 2012-07-18
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above-mentioned reactive distillation technology still has certain defects: the top of the reactive distillation column obtains a complex mixture of binary or ternary azeotropes, and a series of subsequent distillation columns and extraction columns are required to be further separated to obtain high-purity acetic acid isotropes. Propyl ester products, and there will be back-mixing of intermediate components in the conventional multi-element distillation process, and the thermodynamic efficiency is low
This leads to high energy consumption and equipment investment, which is not conducive to improving economic benefits

Method used

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  • Method and apparatus for synthesis of isopropyl acetate
  • Method and apparatus for synthesis of isopropyl acetate
  • Method and apparatus for synthesis of isopropyl acetate

Examples

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example 1

[0019] Example 1: The reactive distillation dividing wall tower is a packed tower with a tower diameter of 2400 mm and a height of 19000 mm. The packing heights of the zone (I) to zone (III) and zone (V) are respectively 2000 mm, 4000 mm, 5500 mm and 4000 mm. The rectifying section (II ) to the cross-sectional area ratio of the side stripping section (V) is 3.3:1. The operating pressure is 100kPa, the operating temperature at the top of the tower is 77°C, and the operating temperature of the phase separator is 50°C. The reaction section (III) and the lower part of the tower kettle (IV) are equipped with a catalyst, the catalyst is Purolite CT179 acidic cation exchange resin, and the temperature of the catalyst bed is 110-112°C. The volumetric space velocity of the acetic acid feed is 0.86h -1 , The feed molar ratio of isopropanol to acetic acid is 1.04:1. The ratio of the mass flow rate of the liquid phase flowing into the rectification section (II) from the top of the parti...

example 2

[0022] Example 2: The reactive distillation dividing wall tower is a packed tower with a tower diameter of 2400mm and a height of 19000mm. The packing heights of the zone (I) to zone (III) and zone (V) are respectively 2000mm, 4000mm, 5500mm and 4000mm, and the rectifying section (II ) to the cross-sectional area ratio of the side stripping section (V) is 2.1:1. The operating pressure is 150kPa, the operating temperature at the top of the tower is 88°C, and the operating temperature of the phase separator is 50°C. The reaction section (III) and the lower part of the tower kettle (IV) are equipped with a catalyst, the catalyst is Amberlyst15 acidic cation exchange resin, and the temperature of the catalyst bed is 122-124°C. The volumetric space velocity of the acetic acid feed is 0.86h -1 , The feed molar ratio of isopropanol to acetic acid is 1.04:1. The ratio of the mass flow rate of the liquid phase flowing into the rectifying section (II) from the top of the partition wal...

example 3

[0025]Example 3: The reactive distillation dividing wall tower is a tower diameter of 2600mm, a plate tower of 2400mm high, and the number of plates in the area (I)~area (III) and area (V) are 8, 14, 20, 14 respectively, and the rectifying section ( The cross-sectional area ratio of II) to the side stripping section (V) is 1.4:1. The operating pressure is 130kPa, the operating temperature at the top of the tower is 83°C, and the operating temperature of the phase separator is 50°C. The reaction section (III) and the lower part of the tower kettle (IV) are equipped with a catalyst, the catalyst is Purolite CT179 acidic cation exchange resin, and the temperature of the catalyst bed is 117-119°C. The volumetric space velocity of the acetic acid feed is 0.86h -1 , The feed molar ratio of isopropanol to acetic acid is 1.04:1. The ratio of the mass flow rate of the liquid phase flowing into the rectifying section (II) from the top of the partition wall (2) to the mass flow rate of...

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Abstract

The present invention relates to a technical method of synthesizing isopropyl acetate with a reaction-rectification bulkhead column, and a device thereof. The reactive distillation bulkhead column is characterized in that a bulkhead is arranged in the vertical direction in a conventional rectification column, the right-side bottom of the bulkhead is sealed, and the whole column is divided into five regions. Raw materials, namely, isopropyl alcohol and acetic acid are added into the column from the upper space of the column reactor; the isopropyl alcohol and the acetic acid perform esterification reaction in the reaction zone or in the lower part of the column reactor to prepare the isopropyl acetate with the influence of a catalyst acidic cation exchange resin; after the gas phase at the top of the column is condensed and separated, the water phase is discharged out of the system, and the ester phase are driven into the top of the column as a back flow; the product isopropyl acetate of high purity can be acquired at the bottom of the side stripping section; and no materials are discharged at the bottom of the column. The advantages of the bulkhead and the reaction distillation arefully developed in the present invention, the esterification reaction and the product purification can be realized in one tower, and the equipment investment and energy consumption can be effectivelyreduced.

Description

technical field [0001] The present invention relates to a reactive distillation process and its device, in particular to a novel process and device for synthesizing isopropyl acetate by means of a reactive rectification dividing wall tower, which can combine the synthesis of isopropyl acetate, product separation and Purification is combined in one column. Background technique [0002] Isopropyl acetate is an important organic chemical raw material and organic solvent. It has excellent alkali resistance and hydrophobicity. Isopropyl acetate has better performance than ethyl acetate and n-butyl acetate, which are widely used at present. Its solubility is better than that of ethyl acetate, and its volatility is better than that of n-butyl acetate. Therefore, it can replace ethyl acetate and n-butyl acetate, and be used in medicine, coatings, inks, adhesives and other industries. At present, the industrial production of isopropyl acetate includes acid alcohol esterification, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/14C07C67/08
CPCY02P20/10
Inventor 孙兰义杨德连李军郭晓燕李青松
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)