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Method for preparing 2-ethyl hexanoic acid by catalytically oxidizing 2-ethylhexanal by molybdovanadophosphoric acid

A technology of phosphomolybdic vanadium heteropolyacid and ethylhexanal, which is applied in the preparation of carboxylates, chemical instruments and methods, preparation of organic compounds, etc., to achieve the effects of high yield, reduced production cost and good selectivity

Inactive Publication Date: 2012-10-03
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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Problems solved by technology

The preparation of 2-ethylhexanoic acid by catalyzed air oxidation of 2-ethylhexanal by phosphomolybdovanadium heteropolyacid has not been reported yet

Method used

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  • Method for preparing 2-ethyl hexanoic acid by catalytically oxidizing 2-ethylhexanal by molybdovanadophosphoric acid
  • Method for preparing 2-ethyl hexanoic acid by catalytically oxidizing 2-ethylhexanal by molybdovanadophosphoric acid
  • Method for preparing 2-ethyl hexanoic acid by catalytically oxidizing 2-ethylhexanal by molybdovanadophosphoric acid

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Embodiment approach 1

[0023] Embodiment 1: Weigh 20.00 g of sodium molybdate, 6.00 g of disodium hydrogen phosphate, and 1.85 g of sodium metavanadate, and dissolve them in deionized water respectively. Put the disodium hydrogen phosphate solution in a constant temperature water bath at 80°C, then slowly add the sodium molybdate solution into the disodium hydrogen phosphate solution, then slowly add concentrated sulfuric acid to the mixed solution for acidification until the solution becomes light yellow. Add the sodium metavanadate solution into the mixed solution acidified with sulfuric acid, and continue to add concentrated sulfuric acid dropwise under vigorous stirring until the solution becomes a transparent orange-red solution. Heating and stirring were stopped, and the mixed solution of the three solutions was cooled to room temperature. Finally, the mixed solution was transferred to a separatory funnel, and a little ether was added. After fully shaking, the layers were allowed to stand and...

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Abstract

The invention discloses a method for preparing 2-ethyl hexanoic acid by catalytically oxidizing 2-ethylhexanal by molybdovanadophosphoric acid, and relates to a method for preparing a chemical preparation. The method comprises the following steps: weighing molybdovanadophosphoric acid and dissolving the molybdovanadophosphoric acid in distilled water at first and then in hydrochloric acid to prepare a catalyst solution; adding 2-ethylhexanal and the prepared catalyst in an ordinary-pressure reaction device, slowly heating and stirring the mixture, regulating oxygen flux, and starting to introduce oxygen when the temperature rises to the reaction temperature; after the reaction is ended, separating out the aqueous phase solution on the lower layer to obtain organic phase matter on the upper layer; and depressurizing and distilling the organic phase matter to obtain colorless transparent and pungent oily liquid, 2-ethyl hexanoic acid. By changing the ratio of molybdenum to vanadium of the catalyst and optimizing the reaction condition, the conversion rate of the 2-ethylhexanal reaches above 99%, and the selection and yield of the 2-ethyl hexanoic acid reach above 98% respectively.

Description

technical field [0001] The invention relates to a preparation method of a chemical preparation, in particular to a method for preparing 2-ethylhexanoic acid by catalyzing and oxidizing 2-ethylhexanal with phosphomolybdovanadium heteropolyacid. Background technique [0002] The prepared phosphomolybdovanadium heteropolyacid has a Keggin structure, has a unique and stable molecular structure, and is easy to design at the molecular level to control its acidity and oxidation properties. The preparation of 2-ethylhexanoic acid by catalyzed air oxidation of 2-ethylhexanal by phosphomolybdovanadium heteropolyacid has not been reported so far. Using phosphomolybdovanadium heteropolyacid as a catalyst, under a certain reaction temperature and a certain air (oxygen) flow rate, it is used for the air oxidation of 2-ethylhexanal. The conversion rate of 2-ethylhexanal is the best. The selectivity of 2-ethylhexanoic acid is up to 99%. Prepare 2-ethylhexanoic acid by catalyzing the oxida...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/128C07C51/235B01J27/199
Inventor 谢颖肖林久单丽娜李文泽
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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