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Continuously producing method for proplonic acid by oxidizing propionic aldehyde

A technology for oxidizing propionic acid and production methods, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems that are not suitable for large-scale industrial production, high requirements for equipment and pipeline materials, and poor product quality control Stability and other issues, to achieve the effect of short reaction time, good product quality and stable properties

Inactive Publication Date: 2005-10-19
XINJIANG XINFENG
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the production of propionic acid at home and abroad mainly adopts batch-type production. For example, the partial continuous production of propionic acid by United Carbide Corporation (UCC) in the United States requires that the purity of the main raw material propionaldehyde is higher (generally equal to or greater than 99%). The stirred reactor with batch reaction has complex technological process and many equipments, and has high requirements on equipment and pipeline materials. The conversion rate of propionaldehyde is 75%, and the yield of propionic acid is 67.5%. The product quality control is not good. Stable, batch-type production process and equipment not suitable for large-scale industrial production

Method used

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  • Continuously producing method for proplonic acid by oxidizing propionic aldehyde

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Experimental program
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Effect test

Embodiment 1

[0034] Example 1, firstly the raw material propionaldehyde is mixed with the catalyst, secondly the mixed propionaldehyde and catalyst and air or oxygen are sent to the bottom of the reaction tower, and then the reaction is carried out in the reaction tower at a reaction temperature of 80°C or 90°C or 100°C, The propionic acid that reaction generates gradually obtains primary crude propionic acid from the overflow of reaction tower; Wherein:

[0035] The catalyst includes a main catalyst and a co-catalyst, the main catalyst is propionate or acetate or naphthenate, the co-catalyst is phosphoric acid, and the weight ratio of propionaldehyde to the main catalyst is 1000 to 0.5 or 1000 to 0.8 or 1000 to 1.0 Or 1000 to 1.5 or 1000 to 2.0 or 1000 to 2.5 or 1000 to 3.0, the weight ratio of propionaldehyde to cocatalyst is 1000 to 0.5 or 1000 to 0.8 or 1000 to 1.2 or 1000 to 1.8 or 1000 to 2.5 or 1000 to 3.2 Or 1000 to 4.0 or 1000 to 4.8 or 1000 to 5.2 or 1000 to 6.0;

[0036] The mo...

Embodiment 2

[0040] Embodiment 2 is different from Embodiment 1 in that: in Embodiment 2, the crude propionic acid that overflows is passed through a low-pressure separation tank to obtain secondary crude propionic acid.

Embodiment 3

[0041] Example 3, the difference from Example 1 and Example 2 is that: in Example 3, the primary crude propionic acid or secondary crude propionic acid in the above-mentioned embodiment can be subjected to normal pressure at 138°C or Perform rectification at 140°C or 142°C to obtain fine propionic acid.

[0042] Among the above main catalysts:

[0043] The propionate may preferably be cobalt propionate or manganese propionate, or cobalt propionate and manganese propionate.

[0044] The acetate may preferably be cobalt acetate or manganese acetate, or cobalt acetate and manganese acetate.

[0045] The naphthenate may preferably be cobalt naphthenate or manganese naphthenate, or cobalt naphthenate and manganese naphthenate.

[0046] In the above-mentioned embodiment, in order to further improve the effects such as the safety of the continuous production method of propionic acid prepared by propionaldehyde oxidation of the present invention, further optimization or / and improvem...

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Abstract

The present invention relates to continuous propionic aldehyde oxidizing process for producing propionic acid and its reaction tower. The production process includes the following steps: mixing propionic aldehyde with catalyst, feeding the mixture of propionic aldehyde and catalyst and air or oxygen to the bottom of reaction tower, and reaction at 80-100 deg.c to obtain coarse propionic acid overflowing in the upper part of the reaction tower. The production process has the features of short technological process, high catalyst activity, low reaction pressure and temperature, short reaction time and high selectivity, and is suitable for industrial production. The present invention has propionic aldehyde converting rate up to 95 %, propionic acid selectivity up to 97 % and propionic acid yield up to 92 %.

Description

1. Technical field: [0001] The invention relates to a production method and a reaction device for producing propionic acid by continuous oxidation of propionaldehyde as a main raw material, and is a continuous production method for producing propionic acid by oxidation of propionaldehyde and a reaction tower thereof. 2. Background technology: [0002] Propionic acid is a very important chemical raw material. Propionic acid and its salts are widely used in food and feed preservatives, etc., and are currently in short supply in China. There is no continuous production device for producing propionic acid by oxidation of propionaldehyde in China, and there is very little laboratory research work in this area. After searching domestic and foreign patent documents, there is no relevant patent document report. [0003] At present, the production of propionic acid at home and abroad mainly adopts batch still production. For example, the partial continuous method of United Carbide Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/235C07C53/122
Inventor 李石新龚涛展江宏宋天龙孟伟李新徐新良薛援冯光童祖基经小平黄奋生张卫星宫晖
Owner XINJIANG XINFENG
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