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Method for synthesizing propyl aldehyde by ethylene hydroformylation

A technology for ethylene hydroformyl and chemical synthesis, which is applied in the separation/purification of carbonyl compounds, carbon monoxide reaction preparation, organic chemistry, etc. Low concentration, low reaction temperature, and the effect of improving conversion rate

Active Publication Date: 2011-04-27
淄博诺奥化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The conversion rate of raw materials is low, and the product of propionaldehyde has high impurities and low content

Method used

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  • Method for synthesizing propyl aldehyde by ethylene hydroformylation
  • Method for synthesizing propyl aldehyde by ethylene hydroformylation
  • Method for synthesizing propyl aldehyde by ethylene hydroformylation

Examples

Experimental program
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Effect test

Embodiment 1

[0082] Taking ethylene, carbon monoxide and hydrogen as raw materials, adopting a rhodium-phosphine complex catalyst system, and synthesizing propionaldehyde through ethylene hydroformylation, it is characterized in that:

[0083] Including synthesis operation unit, separation recovery operation unit and rectification operation unit

[0084] a synthesis operation unit comprises the first synthesis reactor unit and the second synthesis reactor unit, and the technological process is as follows:

[0085] After the raw material ethylene is mixed with the circulating synthesis gas from the stripping tower 18, it enters the bottom of the first synthesis reactor 1, and contacts with the catalyst solution by bubbling through the gas distributor. Under stirring, the synthesis reaction is carried out, and the reaction product propionaldehyde is carried and dissolved therein The catalyst is pumped into the second synthesis reactor 4 through the infusion pump A3, and at the same t...

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Abstract

The invention provides a method for synthesizing propyl aldehyde by ethylene hydroformylation. The invention belongs to preparation of a saturated compound which contains a -CHO group which is connected to an acyclic carbon atom. In the method, the ethylene, carbon monoxide and hydrogen are taken as raw materials. The method comprises the following steps: adopting a rhodium phosphine complex catalyst system and ethylene hydroformylating to synthesize propyl aldehyde. The invention is characterized in that the system comprises a synthesis operating unit, a separation recovery operating unit and a rectification operating unit; and in the method, the complete separation of the synthesized propyl aldehyde product from the catalyst is realized; and the method has the advantages of low catalystconcentration, low consumption, low reaction temperature, long service life of the catalyst, high raw material conversion, less impurities in the propyl aldehyde product and high propyl aldehyde content. The synthesized propyl aldehyde product is completely separated from the catalyst, thus avoiding catalyst loss, reducing catalyst consumption, avoiding decomposition of the catalyst and prolonging the service life of the catalyst. A double-synthesis reactor is adopted, raw materials are recycled, feed gas conversion rate counted by ethylene is more than or equal to 95%, and propyl aldehyde content is more than or equal to 99.9%.

Description

technical field [0001] The invention is a method for synthesizing propionaldehyde through hydroformylation of ethylene. It belongs to the preparation of saturated compounds containing -CHO groups connected to non-ring carbon atoms. Background technique [0002] Propionaldehyde is widely used in pharmaceuticals, pesticide raw materials, coatings, plastics, food, feed additives, and leftover textile auxiliaries. Moreover, in recent years, the demand for propionaldehyde products in domestic and foreign markets has been increasing. [0003] At present, ethylene, carbon monoxide and hydrogen are used as raw materials, and a rhodium-phosphine complex catalyst system is used to pass the mixed raw material gas into the propionaldehyde solution of the catalyst for hydroformylation reaction to prepare propionaldehyde products. The problem is: [0004] 1. The incomplete separation of the synthesized propionaldehyde product from the catalyst causes the loss of the catalyst, and the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/02C07C45/50C07C45/81
Inventor 崔课贤王安军李仁德周立亮董京军林荣恒孙桂奇宋雪洋
Owner 淄博诺奥化工有限公司
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