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A kind of device and method for preparing propyl propionate by autothermal recovery reaction distillation

A technology of propyl propionate and reactive distillation, applied in the field of rectification, can solve the problems of energy waste, heat exchange mismatch, insufficient heat utilization, etc., and achieve the effect of reducing energy consumption and condensing heat exchange load

Active Publication Date: 2021-11-02
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problem of energy waste caused by insufficient heat utilization and mismatch of heat exchange in the current existing process, and improves the recovery rate of products

Method used

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  • A kind of device and method for preparing propyl propionate by autothermal recovery reaction distillation

Examples

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Effect test

Embodiment 1

[0032] Attached figure 1 Shown technological process, the reactive distillation tower 1 that adopts altogether 45 trays, propionic acid inlet is the 7th tray, and propanol inlet is the 31st tray; The operation of reactive distillation tower The pressure is 1 atm. The raw material propionic acid is heated to 103°C by the raw material propionic acid preheater 5 at 50 kmol / h, and then fed from the upper part of the reaction section 17 of the reactive distillation column 1, and the raw material propanol is heated by the raw material propanol heat exchanger 6 at 50 kmol / h After reaching 100°C, mix with propanol 10kmol / h returned from the recovery tower top condenser 10, feed from the lower part of the reaction section 17 of the reactive distillation tower (the alkyd feed ratio is 1.2:1), and the raw material is in the strongly acidic cation Under the action of exchange resin, an esterification reaction occurs in the reaction section 17 of the reactive distillation tower to generat...

Embodiment 2

[0037] Attached figure 1 Shown technological process, the reactive distillation tower 1 that adopts altogether 45 trays, propionic acid inlet is the 7th tray, and propanol inlet is the 31st tray; The operation of reactive distillation tower The pressure is 0.5 atm. The raw material propionic acid is heated through the raw material propionic acid preheater 5 at 50 kmol / h to 78° C., feeds from the upper part of the reaction section 17 of the reactive distillation column 1, and the raw material propanol is heated to 50 kmol / h through the raw material propanol heat exchanger 6 to After 77°C, it is mixed with 20 kmol / h of propanol returned from the top condenser 10 of the recovery tower, fed from the lower part of the reaction section 17 of the reactive distillation tower (alkyd feed ratio is 1.4:1), and the raw material is exchanged with strong acidic cations. Under the action of resin, an esterification reaction occurs in the reaction section 17 of the reactive distillation towe...

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Abstract

The invention discloses a device for preparing propyl propionate through flash heat pump reactive distillation in a tower kettle, and a method for preparing propyl propionate based on refitting. Compared with the existing technology, on the premise of ensuring the product quality, through the energy coupling of the gas-liquid phase stream in the tower, the latent heat of the steam at the top of the rectification tower is fully utilized, and the heat exchanger at the top of the rectification tower is connected with the first After the compressor is heated up and pressurized, it supplies heat to the heat exchanger of the reactive distillation column in the stripping section of the reactive distillation column, without the need for external heat sources to provide heat energy. In addition, since the rectification section of the reactive distillation column is used The latent heat of steam reduces the condensation heat exchange load of the top condenser, and at the same time fully utilizes the heat of each stream, greatly reducing energy consumption.

Description

technical field [0001] The invention belongs to the technical field of rectification, and relates to the production of propyl propionate, in particular to a device and a method for preparing propyl propionate through autothermal recovery reaction distillation. Background technique [0002] Propyl propionate is a fine chemical with a wide range of uses. It is mainly used in printing inks, paints, cleaning agents and seasonings in the food industry. It is an excellent solvent that is miscible with ethanol and ether and slightly soluble in water. ; As a non-toxic and harmless compound, it replaces some aromatic hydrocarbon compound solvents that can cause air pollution, such as benzene. [0003] The production technique of synthesizing propyl propionate mainly contains following several at present, be exactly as a kind of method propionic acid and propanol as raw material, under the effect of strong acid catalyst direct esterification generates propyl propionate, for example do...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/00B01J8/02C07C67/08C07C67/54C07C69/24
CPCB01D3/009B01J8/02C07C67/08C07C67/54C07C69/24Y02P20/10Y02P20/50Y02P70/10
Inventor 叶青岑昊樊玉峰吴卫忠
Owner CHANGZHOU UNIV
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