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Ultrasonic assistant esterification coupling extraction method of organic acid in bio-oil hydrogenation aqueous phase

An ultrasound-assisted, bio-oil technology, applied in the direction of organic chemistry, chemical instruments and methods, and the preparation of organic compounds, can solve the problems of low esterification efficiency, limitations, and low concentration of organic acids, so as to purify aqueous solution and improve esterification Efficiency, the effect of speeding up the reaction rate

Active Publication Date: 2015-05-20
ZHENGZHOU UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the concentration of organic acid in the water phase of bio-oil hydrogenation is very low. Since the esterification reaction is a reversible reaction, the existence of a large amount of water in the water phase of bio-oil hydrogenation limits the equilibrium of the esterification reaction and makes the esterification efficiency low.

Method used

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  • Ultrasonic assistant esterification coupling extraction method of organic acid in bio-oil hydrogenation aqueous phase
  • Ultrasonic assistant esterification coupling extraction method of organic acid in bio-oil hydrogenation aqueous phase
  • Ultrasonic assistant esterification coupling extraction method of organic acid in bio-oil hydrogenation aqueous phase

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Embodiment 1

[0024] The bio-oil hydrogenation aqueous phase with the initial acetic acid concentration of 35.1mg / ml (1#), 44.3mg / ml (2#) and 57.6mg / ml (3#) was used as the raw material, and the molar ratio of acid to alcohol was 1:3. The organic solvent is toluene, and ultrasonic-assisted esterification coupling extraction is performed to recover acetic acid in the bio-oil hydrogenation aqueous phase. The specific steps are as follows:

[0025]Add the same quality bio-oil hydrogenation aqueous phase and toluene into a 250ml Erlenmeyer flask with a stopper (at the same time, a control group without toluene is provided), place the flask in an ultrasonic cleaner, and add organic acid when the water bath is heated to 60°C Anhydrous ethanol with an equimolar amount of 3 times, the amount of concentrated sulfuric acid is 10% of the molar amount of acetic acid; the reaction conditions set the ultrasonic frequency to 40kHz, the ultrasonic power to 80%, react for 3h to reach equilibrium, keep at 60°...

Embodiment 2

[0037] Using 63.5 mg / ml acetic acid aqueous solution as the simulated bio-oil hydrogenation aqueous phase, the acetic acid in it was recovered by ultrasonic-assisted esterification coupling extraction method, and the organic solvent was screened. The specific steps are as follows:

[0038] Add 63.5mg / ml acetic acid aqueous solution and organic solvent of the same mass into a 250ml Erlenmeyer flask with a stopper, place the flask in an ultrasonic cleaner, and add dehydrated alcohol in an equimolar amount to acetic acid when the water bath is heated to 60°C. The amount of sulfuric acid is 10% of the molar amount of acetic acid; the reaction conditions set the ultrasonic frequency to 40kHz, the ultrasonic power to 80%, react for 3h to reach equilibrium, keep at 60°C until the end of the reaction; take a small amount of uniform reaction solution, and separate the reaction solution by standing The water layer and the organic layer after the reaction were obtained, and the contents o...

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Abstract

The invention discloses an ultrasonic assistant esterification coupling extraction method of an organic acid in a bio-oil hydrogenation aqueous phase, and belongs to the technical field of a treatment method of bio-oil hydrogenation aqueous phases. The method disclosed by the invention is suitable for recycling the organic acid in the bio-oil hydrogenation aqueous phase with lower organic acid concentration. Ethanol, a water-insoluble organic solvent and an acidic esterification catalyst are added in the aqueous phase, the organic acid and the ethanol generate an esterification reaction to generate ester under an ultrasonic condition, and the ester is extracted by the organic solvent into an organic phase to promote the esterification reaction in the aqueous phase to carry out towards a positive direction, so as to effectively improve the esterification efficiency. The ultrasonic assistant esterification coupling extraction method disclosed by the invention is used for recycling the organic acid in the bio-oil hydrogenation aqueous phase and converting the organic acid into the ester with higher value, to increase the economic benefit; the esterification coupling extraction method is used for improving the esterification efficiency of a dilute acid solution with a high water content, and the reaction rate is accelerated by ultrasonic; when the organic acid in the bio-oil hydrogenation aqueous phase is recycled, the aqueous solution is primarily purified, thereby reducing the cost of subsequent water treatment.

Description

technical field [0001] The invention relates to a bio-oil hydrogenation aqueous phase treatment method, in particular to an ultrasonic-assisted esterification coupled extraction method for recovering organic acids in the bio-oil hydrogenation aqueous phase. Background technique [0002] With the increasingly prominent environmental problems and the increase of greenhouse gas emissions, the first generation of biofuels produced from food and oil crops as raw materials have achieved commercial production in many countries, but the first generation of biofuels has challenges. Food problems may lead to an increase in global food prices. The second-generation biofuels, which use waste biomass from agriculture and forestry and some energy crops as raw materials, are currently one of the most researched fields, among which rapid pyrolysis of biomass to bio-oil and catalytic hydrogenation of bio-oil to bio-fuel are the first. Second-generation biofuels. It can replace the existing...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C67/58C07C69/14C07C69/24
Inventor 张瑞芹陈瑞红刘永刚张长森
Owner ZHENGZHOU UNIV
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