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Two-stage reaction method for mixed butylene hydroformylation

A butene hydroformylation reaction technology, applied in the field of two-stage hydroformylation reaction to prepare valeraldehyde, can solve problems such as inability to meet high efficiency, reaction differences, etc., and achieves reduction in production cost, improvement in conversion rate, and simplification of process. Effect

Active Publication Date: 2008-10-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In short, although many efforts have been made to solve the problem of the reaction difference between the two olefins in mixed butenes, the existing technology cannot meet all the requirements for high-efficiency industrial production and needs further improvement

Method used

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  • Two-stage reaction method for mixed butylene hydroformylation
  • Two-stage reaction method for mixed butylene hydroformylation
  • Two-stage reaction method for mixed butylene hydroformylation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] This example uses Figure 4 To illustrate.

[0073] Mixed butene 1 composed of 1-butene 50%, 2-butene 36%, butane 14%, and isobutene<1% was synthesized with the synthesis from the stripping column 154 at a rate of 680 g / h Gas 2 enters the first reactor 101 respectively, and in a catalyst solution composed of rhodium-bisphosphite catalyst and valeraldehyde and valeraldehyde trimer solvent, hydrogen formaldehyde is carried out under the conditions of 85°C and 2.1MPa Acylation reaction. The rhodium concentration of the catalyst is 200ppm, and the molar ratio of phosphorus to rhodium is 5:1. The first gaseous phase flow 3 is drawn from the top of the reactor, which mainly contains unutilized synthesis gas and some raw material components. This stream passes through the condenser 112, so that the condensable components taken out are condensed and returned to the reactor. , and the stream passes through a valve with a regulating function (not shown in the figure) so as to ...

Embodiment 2

[0086] According to the same operation steps as in Example 1, except that the mass ratio of the catalyst return stream 15 of the first reactor to the catalyst return stream 16 of the second reactor was adjusted to 30:70, the total utilization rate of raw material olefins was 85.44%.

Embodiment 3

[0088] According to the same operation steps as in Example 1, except that the mass ratio of the catalyst return stream 15 of the first reactor to the catalyst return stream 16 of the second reactor was adjusted to 70:30, the total utilization rate of raw material olefins was 86.10%.

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Abstract

The invention relates to an oxo-synthesis reaction method, particularly a method for preparing pentanal from mixed butylenes by a two-stage hydroformylation reaction. The method comprises the steps that after a first-stage hydroformylation is carried out with mixed butylenes containing 1-butylene and 2-butylene as raw materials, the reaction product containing catalyst in the discharged material is separated; the unreacted material is subjected to a second-stage hydroformylation reaction; catalyst in the two-stage products is separated and returned to two reaction vessels according to a certain proportion. The method solves the problem of reaction difference of two olefins, improves olefin utilization efficiency and reduces production cost; and is applied in a petrochemical field.

Description

technical field [0001] The invention relates to an oxo synthesis reaction method, in particular to a method for preparing valeraldehyde by using mixed butenes as raw materials through two-stage hydroformylation reactions. Background technique [0002] The hydroformylation of olefins is a well-known reaction, and its products have a wide range of application values, and its production technology has been continuously improved. [0003] Hydroformylation of butenes affords valeraldehydes. As an industrial product, if valeraldehyde can use mixed butene as a by-product of petroleum processing as a raw material, the cost will be greatly reduced, but 2-butene contained in mixed butene is not easy to carry out hydroformylation reaction, and it can Whether it is effectively utilized is an important indicator to evaluate the economics of this raw material route. [0004] Conventional high-pressure processes using unmodified catalysts can react 2-butene, but high-pressure processes a...

Claims

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Application Information

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IPC IPC(8): C07C47/02C07C45/50
Inventor 郭浩然朱丽琴包天舒王蕴林王红红
Owner CHINA PETROLEUM & CHEM CORP
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