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Method for preparing butaldehyde by synthesizing propene and carbonyl syngas

A synthesis gas and gas carbonyl technology, which is applied in carbon monoxide reaction preparation, chemical recovery, organic chemistry, etc., can solve the problems of low conversion rate and production capacity of the second reactor, high production cost, and short catalyst service life

Active Publication Date: 2014-02-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that there are problems in the prior art that the conversion rate and production capacity of the second reactor are low, the service life of the catalyst is short, and the production cost is high, and a new method for preparing butyraldehyde by carbonylation of propylene and synthesis gas is provided

Method used

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  • Method for preparing butaldehyde by synthesizing propene and carbonyl syngas
  • Method for preparing butaldehyde by synthesizing propene and carbonyl syngas
  • Method for preparing butaldehyde by synthesizing propene and carbonyl syngas

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Effect test

Embodiment 1

[0023] according to figure 2 In the process shown, the stream I containing propylene, synthesis gas and catalyst enters the first reactor 1. After the reaction, the vapor phase stream II is obtained at the top of the tower, and the liquid phase stream III is obtained at the bottom of the tower. The stream III and the stripped synthesis gas 5 enter the separation unit 7, and after separation, the stripped stream IV, the recovered catalyst stream V, the recycled butyraldehyde stream VI and the separated butyraldehyde product 3 are obtained. Stream II, stream VII, stream VI, stream X and supplementary synthesis gas 6 enter the second reactor 2, and after the reaction, stream IX and tail gas 4 are obtained; stream XI enters the separation unit 7, and tail gas 4 is discharged outside.

[0024] The operating conditions of the first reactor are: pressure 1900KPa, temperature 90°C, residence time 3 hours. The weight ratio of propylene, synthesis gas and catalyst in stream I is 1:0.5...

Embodiment 2

[0036] Same as [Example 1], except that the operating conditions of the separation unit are: the pressure of the first falling film evaporator is 800KPa, and the temperature is 130°C; the pressure of the second falling film evaporator is 250KPa, and the temperature is 130°C. At the same time, the amount of feed is increased to increase the total production capacity of the reaction unit.

[0037] The reaction result is: the conversion rate of the first reactor is 65%, and the conversion rate of the second reactor is 83%. See Table 4 and Table 5 for details.

[0038] Table 4

[0039]

[0040] TPP: Catalyst ligand triphenylphosphine, this data reflects the catalyst concentration in the stream.

[0041] table 5

[0042]

[0043] Under the premise of not changing the structure, size and size of the two reactors, the production capacity of the reaction unit is increased by 10%. Nascent butyraldehyde increased from 395kmol / h to 435kmol / h. If there is a margin of more than ...

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Abstract

The invention relates to a method for preparing butaldehyde by synthesizing propene and carbonyl syngas and mainly solves the problems of low conversion rate and yield of a second reactor, short life cycle of catalysts and high production cost in the prior art. The method comprises the following steps of: a) leading a material flow I containing the propene and the syngas into a first reactor, and obtaining a gas-phase material flow II at the tower top and obtaining a liquid-phase material flow III in the tower kettle; b) leading the material flow III with steam stripping syngas 5 into a separation unit 7, and obtaining a steam stripping material flow IV, a recovery catalyst material flow V, a circulating butaldehyde material flow VI and a separated product 3 of butaldehyde, wherein the material flow IV is divided into a material flow VII and a material flow VIII, the material flow V is divided into a material flow IX and a material flow X, and the material flow VIII and the material flow IX are circulated to the first reactor; and c) leading the material flow II, the material flow VII, the material flow VI, the material flow I and supplementary syngas 6 into a second reactor and obtaining a material flow XI and tail gas 4 after the reaction, leading the material flow XI into the separation unit 7, and discharging the tail gas to the external part or leading the tail gas into the follow-up process. Through the adoption of the technical scheme, the invention has the advantage of well solving the above problems and can be applied to the industrial production for preparing the butaldehyde by synthesizing the propene and the carbonyl syngas.

Description

technical field [0001] The invention relates to a method for preparing butyraldehyde by carbonyl synthesis of propylene and synthesis gas. Background technique [0002] Butyraldehyde is an important organic chemical raw material. At present, it is mainly produced industrially from propylene, carbon monoxide and hydrogen through oxo synthesis. The literature "Simulation Research on Propylene Carbonylation Process for Butyraldehyde Synthesis, Natural Gas Chemical Industry, 2009(34): 20-24" discloses a process flow for preparing butyraldehyde by carbonylation of propylene and synthesis gas. In this process, propylene and syngas are used as raw materials, which pass through two series-connected reactors in sequence to obtain the product butyraldehyde. Then the product enters the downstream separation section. Through two evaporations, propylene and catalyst are recycled as much as possible. Part of the butyraldehyde is recycled as a reaction solvent, and part of it is sent to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C47/02C07C45/50
CPCY02P20/584
Inventor 陈迎李真泽印立峰章彦卿
Owner CHINA PETROLEUM & CHEM CORP