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Process for synthesizing isopropyl acetate and method for preparing its catalyst

A technology of isopropyl acetate and synthesis process, which is applied in the direction of catalyst activation/preparation, carboxylic acid ester preparation, organic compound preparation, etc., can solve the problems of many side reactions, high production costs, high equipment investment and maintenance costs, and achieve High activity and selectivity, reduced production cost, and the effect of overcoming equipment corrosion

Inactive Publication Date: 2004-03-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is exactly in order to overcome and solve the serious corrosion of equipment, many side reactions, difficult product separation, high production cost, troublesome waste water treatment or large intermittent reaction energy loss in the still reaction in the existing synthetic isopropyl acetate technique , Troublesome operation, high system pressure, high equipment investment and maintenance costs and other shortcomings and problems, research and invent a non-corrosive equipment, easy product separation, low production cost, low equipment investment and maintenance costs, and small energy loss. Easy to operate, practical and other advantages in industrial production by the reaction of acetic acid and propylene to synthesize isopropyl acetate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Put 2ml of HD-1 modified resin catalyst into the above-mentioned reaction tube, adjust the reaction temperature to 125°C, activate the catalyst with nitrogen for 8 hours, turn on the micro feed pump and feed at a rate of 2.2ml per hour for 15 minutes Finally, start to feed propylene, and after replacing the air under normal pressure, gradually increase the pressure to 1.0Mpa. To promote the reaction, keep the tail propylene flow rate at 30ml / min. The reaction can be sampled and analyzed after a period of time (6-8 hours). The product was analyzed by Shimadzu GC-7A gas chromatograph, the conversion rate of acetic acid was 90%, and the selectivity of the generated isopropyl acetate was 99.1%.

Embodiment 2

[0017] HD-1 type modified resin catalyst has been carried out life test according to the condition described in embodiment 1, and continuous operation 1000 hours, catalyst activity drops to about 42% from 90%, the selectivity of the isopropyl acetate of generation is 99% %.

Embodiment 3

[0019] Except that the reaction temperature is changed to 95° C., the others are the same as in Example 1, and the result is: the conversion of acetic acid is 80%, and the selectivity of isopropyl acetate is 99.0%.

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Abstract

The present invention relates to a process for synthesizing isopropyl acetate and preparation method of its catalyst. Its process adopts fixed bed reactor, uses solid catalyst, and makes reaction under the condition of gas-liquid-solid three-phase reaction, and its solid catalyst includes modified resin catalyst, silica-gel loaded heteropolyacid catalyst, silica-gel loaded phosphoric acid catalyst and super acidic catalyst, its reaction temp. is 80-125 deg.C, propylene pressure is 0.8-1.4 MPa, acetic acid feeding space velocity is 1.0-2.8 h(-1), propylene feeding space velocity is 80-108 hr(-1), and the mole ratio of acetic acid and propylene is 1:1.15-1.80. Said invention also includes the preparation method of the above-mentioned catalysts.

Description

technical field [0001] The invention relates to a synthesis process of isopropyl acetate and a preparation method of a catalyst thereof, belonging to the preparation technology of isopropyl acetate. Background technique [0002] Isopropyl acetate is an important fine chemical, which has excellent alkali resistance and hydrophobicity, and can be used as a solvent, dehydrating agent and drug extractant. Isopropyl acetate has more superior properties 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 coatings, inks, adhesives, pharmaceuticals and other industries. At present, the industrial production process of isopropyl acetate is as follows: acetic acid and isopropanol are used as raw materials, and sulfuric acid is used as a catalyst to directly ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/16B01J27/188B01J37/02C07C67/04C07C69/14
Inventor 廖世军袁高清陆恩锡李华曹炳铖梅慈云高鹏张慧娟张小玲张震杨兆禧梁路一朱继芳景强曾惠清
Owner SOUTH CHINA UNIV OF TECH
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