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Reactive distillation method and device for low-pressure carbonylation of butyraldehyde

A technology of carbonylation and reactive distillation tower, which is applied in the field of reactive distillation of low-pressure carbonylation of butyraldehyde, can solve the problems of no relevant patents, etc., and achieve the effect of reducing operating costs and saving equipment investment

Active Publication Date: 2016-04-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no relevant patents and reports on the reactive distillation technology applied in the oxo synthesis of butyraldehyde.

Method used

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  • Reactive distillation method and device for low-pressure carbonylation of butyraldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022]In this example, the pressure of the reactive distillation tower is 1.7Mpa, the temperature of the reaction section is 110°C, the catalyst is rhodium-triphenylphosphine, the solvent is the trimer of butyraldehyde, the mass fraction of rhodium in the reaction solution is 250ppm, and the triphenylphosphine The mass fraction of phosphine is 8%, the molar ratio of feed composition propylene and synthesis gas is 1:2; the pressure of flash tower is 1Mpa; the pressure of absorption tower is 0.6Mpa; the pressure of stripper is 3Mpa, the crude butyraldehyde solution and synthesis gas The molar ratio is 1:1. Finally, the recovery rate of propylene in the non-condensable gas at the top of the reactive distillation column was 92%, and the mass purity of mixed butyraldehyde was 99%.

Embodiment 2

[0024] In this example, the pressure of the reactive distillation tower is 1.9Mpa, the temperature of the reaction section is 80°C, the catalyst is rhodium-triphenylphosphine, the solvent is a trimer of butyraldehyde, the mass fraction of rhodium in the reaction solution is 350ppm, and the triphenylphosphine The mass fraction of phosphine is 12%, the molar ratio of feed composition propylene and synthesis gas is 1:3; the pressure of the flash tower is 0.1Mpa; the pressure of the absorption tower is 1Mpa; The gas molar ratio is 1:1. Finally, the recovery rate of propylene in the non-condensable gas at the top of the reactive distillation column was 93%, and the mass purity of mixed butyraldehyde was 99.5%.

Embodiment 3

[0026] In this example, the pressure of the reactive distillation column is 1.8Mpa, the temperature of the reaction section is 100°C, the catalyst is rhodium-triphenylphosphine, the solvent is a trimer of butyraldehyde, the mass fraction of rhodium in the reaction solution is 450ppm, and the triphenylphosphine The mass fraction of phosphine is 10%, the molar ratio of feed composition propylene to synthesis gas is 1:2.5; the pressure of flash tower is 0.5Mpa; the pressure of absorption tower is 0.1Mpa; the pressure of stripping tower is 1Mpa, the crude butyraldehyde solution and synthesis The gas molar ratio is 1:1. Finally, the recovery rate of propylene in the non-condensable gas at the top of the reactive distillation column is 90%, and the mass purity of mixed butyraldehyde is 99.2%.

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Abstract

The invention relates to a reactive distillation method and device for butyraldehyde synthesis by low-pressure carbonyl. A gas phase outlet of a condenser at the top of a reactive distillation tower is connected with a lower feed port of an absorption tower, a liquid phase outlet is connected to a backflow feed port of the reactive distillation tower, and a tower bottom discharge material enters a flash tower; a flash tower bottom discharge material is a catalyst solution and is connected to a feed port in the upper part of a reaction section of the reactive distillation tower, and a tower top outlet is connected to an upper feed port of the absorption tower; waste gas is discharged from the top of the absorption tower, and a tower bottom discharge material is crude butyraldehyde and enters an upper feed port of a stripping tower; synthesis gas enters a bottom feed port of the stripping tower, a gas outlet in the top of the stripping tower is connected to a feed port of the reactive distillation tower, and a mixed butyraldehyde product is obtained after discharging from a tower kettle. The reaction of butyraldehyde synthesis by low-pressure carbonyl and butyraldehyde purification and distillation separation operated by two units are organically coupled in one device simultaneously, propylene in the condensed gas phase at the top of the reactive distillation tower is collected through operation of the absorption tower and the stripping tower, the recovery rate of propylene is up to 90%, and the quality purity of mixed butyraldehyde can be up to 99%.

Description

technical field [0001] The invention relates to the technical field of butyraldehyde production, in particular to a reactive distillation method and device for low-pressure carbonylation of butyraldehyde. Background technique [0002] Butyraldehyde is an intermediate of important organic chemical raw materials and an important raw material for the production of various fine chemical products. Butyraldehyde has two isomers, n-butyraldehyde and isobutyraldehyde, and n-butyraldehyde is mainly used in the production of n-butanol and 2-ethylhexanol, and is also used in the production of trimethylolpropane, polyvinyl butyral, etc. Fine chemical products; isobutyraldehyde is mainly used in the production of isobutanol, neopentyl glycol, condensation and esterification products 2,2,4-trimethylpentanediol, isobutyric acid, isobutyronitrile, etc. [0003] There are many ways to synthesize butyraldehyde, such as acetaldehyde condensation, butanol oxidative dehydrogenation and oxo synt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/50C07C45/82C07C47/02
CPCB01D3/009C07C45/50C07C45/783C07C45/82C07C47/02Y02P20/10
Inventor 李洪高鑫丛山贾雪婷李鑫钢戴彬朱永华
Owner TIANJIN UNIV