A kind of device and method for preparing propyl propionate by column flashing type heat pump reactive distillation

A technology of propyl propionate and reactive distillation, applied in the field of rectification, which can solve the problems of heat exchange mismatch, insufficient heat utilization, energy waste, etc., to reduce condensation heat exchange load, save heating heat source, and reduce energy consumption Effect

Active Publication Date: 2022-03-22
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To solve the problem of energy waste caused by insufficient heat utilization and mismatch of heat exchange in the existing process

Method used

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  • A kind of device and method for preparing propyl propionate by column flashing type heat pump reactive distillation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Attached figure 1 In the shown process flow, the reactive distillation tower 1 adopted has 45 trays, the propionic acid feed inlet is the 7th tray, and the propanol feed inlet is the 31st tray; The operating pressure is 101.3kPa, the temperature at the top of the reaction distillation tower top area 16 is 104°C, the temperature at the bottom of the reaction distillation tower bottom recovery area 18 is 117°C, the power of the first compressor 9 is 213kW, and the first throttle valve The outlet pressure of 11 is 19kPa.

[0032] The raw material propionic acid is heated to the bubble point by the raw material propionic acid preheater 6 at 50 kmol / h, and is then fed from the upper part of the reaction separation zone 17 of the reactive distillation column, and 50 kmol / h of propanol with a low boiling point is preheated and exchanged by the raw material propanol After the device 5 is heated to the bubble point, it is mixed with 10 kmol / h of propanol and propyl propionate m...

Embodiment 2

[0036] Attached figure 1 In the shown process flow, the reactive distillation tower 1 adopted has 48 trays, the propionic acid feed inlet is the 8th tray, and the propanol feed inlet is the 32nd tray; The operating pressure is 101.3kPa, the temperature at the top of the top separation zone 16 of the reactive distillation column is 104°C, the temperature at the bottom of the bottom recovery zone 18 of the reactive distillation column is 117°C, the power of the first compressor 9 is 226kW, and the first throttling The outlet pressure of valve 11 is 17kPa.

[0037] After the raw material propionic acid is heated by the raw material propionic acid preheater 6 at 100 kmol / h, it is fed from the upper part of the reaction separation zone 17 of the reactive distillation column, and 100 kmol / h of propanol with a low boiling point is heated by the raw material propanol preheating heat exchanger 5 Finally mix with the propanol and propyl propionate mixture 20kmol / h that returns from the...

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Abstract

The invention discloses a device for preparing propyl propionate through tower still flashing type heat pump reactive distillation and a method for preparing propyl propionate based on the device, wherein the device includes a reactive distillation tower and a recovery tower. During the whole preparation process, by adding a throttle valve to the stream that needs to be reboiled in the two towers, the temperature and pressure of the stream in the tower are reduced, and the stream in the tower is heated by the heat of the steam at the top of the tower in the heat exchanger, and Use the compressor to increase the temperature and pressure as the heat source of the distillation column. It replaces the heat exchanger that requires a large amount of hot utilities to supply heat. In addition, because the latent heat of the steam at the top of the tower is used, the condensation heat exchange load of the top condenser is reduced. The process only needs external heat utilities to add raw material propionic acid Logistics, saving energy.

Description

technical field [0001] The invention belongs to the technical field of rectification, and relates to a production method of propyl propionate, in particular to a device and a method for preparing propyl propionate through tower still flashing heat pump reaction rectification. 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 kinds at present, be exactly as a kind of method propionic acid and propyl alcohol as raw material, under the effect of strong acid catalyst direct esterification generates propy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/08C07C67/54C07C69/24
CPCC07C67/08C07C67/54C07C69/24Y02P20/10
Inventor 叶青岑昊樊玉峰吴卫忠
Owner CHANGZHOU UNIV
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