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Method for preparation of propionic acid

A technology of propionic acid and propionaldehyde, which is applied in the preparation of carboxylate, organic compound, chemical instruments and methods, etc., can solve the problems of long process steps and expensive catalysts, and achieve low equipment investment and safe and reliable reaction process , The effect of low production cost

Inactive Publication Date: 2006-10-04
SINOPEC QILU CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the reaction time of this process is short, the catalyst is expensive, and the process steps are long in addition to solvent recovery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 150 grams of propionaldehyde to a stainless steel bubble column with an inner diameter of 25 mm and a height of 1000 mm. Nitrogen was used to pressurize to 0.3MPa, and 99 grams of oxygen was fed in at a constant speed within 5 hours. During the reaction process, the reaction material is externally circulated at a speed of 70ml / min, and the reaction temperature is kept at 50-60°C. The heat of reaction can be removed by external circulation and cooling water, and the reaction ends after 5 hours. According to gas chromatography analysis, the conversion rate of propionaldehyde was 99.5%, and the selectivity of propionic acid was 98.0%.

Embodiment 2

[0025] Adopt the same bubble column reactor as in Example 1. Add 100 grams of propionaldehyde and 50 grams of propionic acid. Nitrogen was used to pressurize to 0.4MPa, and 25 grams of oxygen and 120 grams of air were introduced at a constant speed within 4 hours. During the reaction process, the reaction material was externally circulated at a speed of 80ml / min, and the reaction temperature was kept at 45-55°C. After 4 hours the reaction was complete. Analysis by gas chromatography shows that the conversion rate of propionaldehyde is 99.3%, and the selectivity of propionic acid is 97.2%.

Embodiment 3

[0027] Adopt the same bubble column reactor as in Example 1. Add 150 grams of propionaldehyde. Pressurize to 0.5MPa with nitrogen, and feed 215g of air at a constant speed within 5 hours. During the reaction, the reaction material was circulated externally at a speed of 80ml / min. The reaction temperature is 60-70° C., and the reaction time is 5 hours. After sampling analysis, the conversion rate of propionaldehyde was 99.6%, and the selectivity of propionic acid was 97.4%.

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PUM

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Abstract

The invention relates to a process for preparing propionic acid by using acetone as raw material, using oxygen, air, or the gas mixture of oxygen and gas exhibiting inert property to the reaction as oxidant for oxidation reaction without the requirement of catalyst.

Description

1. Technical field [0001] The invention relates to a method for preparing propionic acid, in particular to a process for synthesizing propionic acid with propionaldehyde as a raw material. 2. Background technology [0002] Propionic acid is an important chemical raw material with a wide range of uses. Propionic acid and its salts have remarkable effects in preventing grain agglomeration, food preservation, and feed preservation; among the currently used preservative varieties, propionic acid is recognized as the most economical, safe and effective edible preservative in the world . In addition, propionic acid can be used as electroplating aid, emulsifier, nitrocellulose solvent and plasticizer, etc., and the derivatives of propionic acid can be used in food and fragrance industry, pharmaceutical industry and low-toxicity pesticide industry. [0003] Propionic acid was originally produced by fermentation of sugar or starch. Later, according to different sources of raw mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/122C07C51/235
Inventor 菅秀君丁文光刁香任涛刘宝坤刘莹
Owner SINOPEC QILU CO
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