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2-ethyl hexanoic acid production method

A manufacturing method and technology of ethylhexanoic acid are applied in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds, etc., to achieve the effects of reducing contact time, inhibiting side reactions, and reducing production costs

Inactive Publication Date: 2003-06-11
QILU PETRO CHEM - SINOPEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent only involves the production method of n-octanoic acid, and does not involve the production method of 2-ethylhexanoic acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The reaction tower is a glass tube with an inner diameter of 20mm and a height of 1500mm. Glass beads of φ4mm are installed in the tube, and the filling height is 1200mm, which is equivalent to 3 theoretical plates. There is a glass jacket on the outside, which is cooled by cooling water. Add the 2-ethylhexanal-2-ethylhexanoic acid solution that contains 2-ethylhexanal 20% with the speed of 4g / min to reaction tower, contain the Mn(Ac) of 0.2% in this solution 2 , feed the required oxygen at a constant speed under normal pressure, and control the feed O 2 / aldehyde=0.6:1 (mol / mol). The temperature of the cooling water in the external jacket was controlled to ensure that the temperature of the hot spot on the inner wall of the reactor was 24°C during the reaction. The reaction product flows into the product collector from the bottom of the tower. During the reaction process, the product sample was analyzed, and the conversion rate of 2-ethylhexanal was 99.7%, and the s...

Embodiment 2

[0030] Reaction tower is with embodiment 1. The filling height of glass beads is 800mm, which is equivalent to 2 theoretical plates. Add the 2-ethylhexanal-2-ethylhexanoic acid solution that contains 2-ethylhexanal 20% with the speed of 4g / min to reaction tower, contain 0.2% KAc in this solution, under normal pressure Oxygen needs to be introduced at a constant speed, and the feeding of O is controlled. 2 / aldehyde=0.6:1 (mol / mol). The temperature of the cooling water in the external jacket was controlled to ensure that the temperature of the hot spot on the inner wall of the reactor was 24°C during the reaction. The reaction product flows into the product collector from the bottom of the tower. During the reaction process, the product samples were taken for analysis, and the conversion rate of 2-ethylhexanal was 99.6%, and the selectivity of 2-ethylhexanoic acid was 96.8%.

Embodiment 3

[0032] Reaction tower is with embodiment 1. The filling height of glass beads is 400mm, which is equivalent to 1 theoretical plate. Add the 2-ethylhexanal-n-butyric acid solution that contains 2-ethylhexanal 20% with the speed of 5g / min to reaction tower, contain the Cu(Ac) of 0.2% in this solution 2 , feed the required oxygen at a constant speed under normal pressure, and control the feed O 2 / aldehyde=0.7:1 (mol / mol). The temperature of the cooling water in the external jacket was controlled to ensure that the temperature of the hot spot on the inner wall of the reactor was 30°C during the reaction. The product flows into the product collector from the bottom of the tower. During the reaction process, product samples were taken for analysis, and the conversion rate of 2-ethylhexanal was 99.3%, and the selectivity of 2-hexanoic acid was 95.9%.

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Abstract

The invention discloses a method to make 2-ethyl hexyl acid. It uses raw material and solvent containing 2-ethyl hexyl aldehyde to make the oxidation reaction in reaction tower. The raw material is added from the top of the reaction tower, oxygenous gas is input from the bottom of that, and they upstream touch and react in the reaction tower. The oxidition reaction had better to made under the action of catalyzer which can be Mn(Ac)2, KAc, NaC, Cu(Ac)2 or the mixture composed of the four kinds matters in arbitrary proportion.

Description

technical field [0001] The invention relates to a method for producing 2-ethylhexanoic acid, in particular to a method for producing 2-ethylhexanoic acid by oxidation reaction in a reaction tower using 2-ethylhexanal and oxygen-containing gas as reaction raw materials method. Background technique [0002] 2-Ethylhexanoic acid, commonly known as isooctanoic acid, is a kind of artificially synthesized branched chain fatty acid. It is a colorless and transparent oily liquid. It is mainly used to prepare esters and salts. It is widely used as a drier in the coating industry. It can be used as a thickener in the ink industry, as a plasticizer in plastics and synthetic resins, as a salt reagent in pharmaceutical synthesis, etc. [0003] Generally, 2-ethylhexanoic acid has three manufacturing methods: 2-ethylhexanol oxidation method, 2-ethylhexanol catalytic dehydrogenation method and 2-ethylhexanal oxidation method. Among them, the 2-ethylhexanol oxidatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/235C07C53/126
Inventor 邵常东刘福胜杨琦丁文光
Owner QILU PETRO CHEM - SINOPEC
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