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Catulyst for preparing propionic acid by propionaldehyde oxidation and its method

An oxidation system and catalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problem of raw material consumption quotas and high production costs, propionic acid selectivity And low yield, poor product quality and other problems, to achieve the effect of improving yield and quality, improving catalytic activity, and reducing pressure

Inactive Publication Date: 2006-07-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are defects such as long reaction cycle, low selectivity and yield of propionic acid, poor product quality, etc., resulting in high raw material consumption quota and high production cost
No patents have been applied for in the research and development of catalysts for the oxidation of propionaldehyde to propionic acid at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1. Put 1000 parts by weight of propionaldehyde in a reactor, add 1 part by weight of cobalt propionate and 2 parts by weight of phosphoric acid, and mix them thoroughly in the reactor. Feed nitrogen into the reactor to make the pressure 0.4MPa, heat, stir, feed oxygen to make the pressure 0.6~2.0MPa, and react at 90~100°C for 2 hours. Cool to room temperature, and rectify the product in the kettle under normal pressure to collect the distillate at 138~142°C as propionic acid. The conversion rate of propionaldehyde was 96%, the selectivity of propionic acid was 98%, and the yield of propionic acid was 95%.

Embodiment 2

[0028] Example 2: Put 1000 parts by weight of propionaldehyde in the reactor, add 1 part by weight of manganese propionate and 3 parts by weight of phosphoric acid, and fully mix them in the reactor. Feed nitrogen into the reactor to make the pressure 0.4MPa, heat, stir, feed oxygen to make the pressure 0.6~1.8MPa, and react at 80~100°C for 2.5 hours. Cool to room temperature, and rectify the product in the kettle under normal pressure to collect the distillate at 138~142°C as propionic acid. The conversion rate of propionaldehyde was 96%, the selectivity of propionic acid was 97%, and the yield of propionic acid was 94%.

Embodiment 3

[0029] Example 3: Put 1000 parts by weight of propionaldehyde in the reactor, add 1 part by weight of cobalt naphthenate and 6 parts by weight of phosphoric acid, and mix them thoroughly in the reactor. Feed nitrogen into the reactor to make the pressure 0.4 MPa, heat, stir, feed air to make the pressure 0.6~2.0 MPa, and react at 80~100°C for 3 hours. Cool to room temperature, and rectify the product in the kettle under normal pressure to collect the distillate at 138~142°C as propionic acid. The conversion rate of propionaldehyde was 95%, the selectivity of propionic acid was 97%, and the yield of propionic acid was 92%.

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PUM

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Abstract

A catalyst for synthesizing propionic acid by oxidizing propanal in O2 or air is a complex catalyst consisting of propionate (or acetate or naphthenate) and phosphoric acid. It has high activity selectivity low reaction pressure and reaction temp. and output rate of product.

Description

[0001] Involved areas: [0002] The invention relates to the field of chemical industry, in particular to a catalyst for preparing propionic acid by oxidation of propionaldehyde and a method thereof. Background technique: [0003] Propionic acid is an important chemical raw material, which is currently in short supply in China. Propionic acid has the typical chemical properties of low-carbon carboxylic acids, and can be used to prepare propionate, ester, acid chloride, amide and acid anhydride. Propionate is an important food and feed preservative, esters of propionic acid are important solvents and spices, propionyl chloride and anhydride of propionic acid are important pesticides and pharmaceutical intermediates. Propionic acid and its derivatives have been widely used in agriculture, textile, food, medicine and other industries, and its use is constantly expanding, and its consumption is increasing year by year. The United States, Western Europe, and Japan are the major p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/122C07C51/235B01J31/04
Inventor 展江宏龚涛李新孟伟童祖基徐新良
Owner PETROCHINA CO LTD
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