Equipment and method for preparing isophorone through acetone gas phase condensation

A technology for isophorone and acetone, which is applied in the field of isophorone preparation by gas-phase condensation of acetone, can solve the problems of difficulty in control, unproduct separation and treatment, corrosion of equipment, etc., and achieves the advantages of saving energy consumption, reducing separation difficulty and saving costs. Effect

Active Publication Date: 2018-01-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN1166481 discloses a method for preparing isophorone: heating acetone and catalyst together under high pressure, and reacting under liquid or gas phase conditions, the conversion rate of acetone is 25%, and the selectivity of isophorone is 37%, but the method does not carry out the separation of subsequent products
There are 3 deficiencies in this method: first, the diacetone alcohol mixture reacts in the heat exchanger, which is difficult to control; secondly, the catalyst KOH solution in the second reaction tower will corrode the equipment; finally, the product obtained by this method is Isophor The ketone synthesis liquid still needs subsequent neutralization and rectification to obtain the isophorone product

Method used

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  • Equipment and method for preparing isophorone through acetone gas phase condensation
  • Equipment and method for preparing isophorone through acetone gas phase condensation
  • Equipment and method for preparing isophorone through acetone gas phase condensation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The acetone raw material 1 is heated by the vaporizer 2 and then exchanges heat with the product 7 of the fixed-bed reactor 6. After the heat exchange, the stream 5 enters the fixed-bed reactor and undergoes condensation reaction under the action of the catalyst to generate the product isophorone, and the by-product isophorone. Propylene oxide, mesitylene, tetramer and impurity water.

[0038] The stream 8 after the heat exchange between the product of the reactor and the raw material acetone enters the acetone recovery tower 9 for acetone recovery, the high-purity acetone 12 obtained at the top of the tower is recycled to the vaporizer 2 for reuse, and the mixture 14 at the bottom of the tower enters the azeotropic dividing wall tower 15 for separation.

[0039] Replenishing entrainer 21 enters in azeotropic dividing wall tower 15 tower top liquid separator tank 20, after water 25 is removed in azeotropic dividing wall tower 15, tower bottom mixture 28 enters mesityl ox...

Embodiment 2

[0047] The technical process in this embodiment is the same as that in Embodiment 1, the difference is that: n-butyl acetate is used as the entrainer, the operating pressure of the fixed bed reactor 6 is 1.0 atm, and the temperature is 335 ° C; the acetone recovery tower 9 is a filler The tower has 50 theoretical plates, the operating pressure is 1.0 atm, the temperature at the top of the tower is 45°C, and the temperature at the bottom of the tower is 80°C. The azeotropic dividing wall tower 15 is a plate tower, the number of theoretical plates in the water purification zone 17 is 16, the number of theoretical plates in the azeotropic rectification zone 16 is 42, the operating pressure is 1.2atm, and the tower top temperature is 62°C. The temperature at the bottom of the column was 83°C. The mesityl oxide column 29 is a packed column with a theoretical plate number of 35, an operating pressure of 0.25 atm, a tower top temperature of 47°C, and a tower bottom temperature of 132...

Embodiment 3

[0052] The process flow of this embodiment is the same as that of Embodiment 1, except that: isobutyl formate is used as the entrainer, the operating pressure of the fixed-bed reactor 6 is 3.5 atm, and the temperature is 360°C. The acetone recovery tower 9 is a plate tower with a theoretical plate number of 60, an operating pressure of 2 atm, a tower top temperature of 55°C, and a tower bottom temperature of 95°C. The azeotropic dividing wall tower 15 is a plate tower, the number of theoretical plates in the water purification zone 17 is 17, the number of theoretical plates in the azeotropic rectification zone 16 is 45, the operating pressure is 2atm, and the temperature at the top of the tower is 70°C. The bottom temperature was 92°C. The mesityl oxide column 29 is a packed column with a theoretical plate number of 46, an operating pressure of 0.75 atm, a tower top temperature of 60°C, and a tower bottom temperature of 159°C. The second dividing wall tower 35 is a plate towe...

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Abstract

The invention relates to equipment and a method for preparing isophorone through acetone gas phase condensation. The equipment comprises an acetone recovery tower, a first partition wall tower, an isopropyl acetone tower and a second partition wall tower; in the first partition wall tower, a partition plate is positioned on a central axis in the tower, an azeotropic rectification zone is positioned on the left side of the partition plate, and a water purification zone is positioned on the right side of the partition plate; and in the second partition wall tower, a partition plate is positionedon a central axis in the tower, a primary distillation zone is positioned on the left side of the partition plate, a lateral line zone is positioned on the right side of the partition plate, a publicrectifying section is positioned at the upper part of the partition plate, and a public stripping section is positioned at the lower part of the partition plate. The equipment and the method providedby the invention have the benefits that with the adoption of the partition wall towers and other novel separation technologies, all products in the acetone condensation reaction can be effectively separated and recovered, namely isopolone as a main product, isopropyl acetone as a by-product, sym-trimethylbenzene, a tetramer and the like, and the quality purity of each of the products is higher than or equal to 99.60%; and in addition, the technical process of preparing the isophorone by the acetone condensation is significantly simplified, so that the equipment investment and the energy consumption are reduced.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a device and a method for preparing isophorone by gas-phase condensation of acetone. Background technique [0002] As one of the important products of acetone deep processing, isophorone has a wide range of uses; as a high-boiling solvent with excellent performance, it can dissolve nitrocellulose, acrylic resin, alkyd resin, polyester resin, epoxy resin, etc. , Adhesives, medicines, inks, pesticides and other industrial raw materials for polymer solid propellants. Isophorone is widely used: isophorone diamine (IPDA) synthesized from it can be used as epoxy resin curing agent; isophorone diisocyanate (IPDI) produced from it can be used as raw material for advanced paint coatings It can increase the service life of the paint, and it will not turn yellow. It still has good performance as an automobile paint for more than 5 years; the trimethyl adipic acid prepared by it c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/74C07C45/84C07C45/82C07C49/603C07C49/203C07C7/06C07C7/04C07C15/02
Inventor 孙兰义侯亚飞柴永明王芳珠刘晨光
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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