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A kind of water-based deep eutectic solvent and its preparation method and a kind of oil extraction desulfurization method

A deep eutectic solvent and water-based technology, which is applied in refining hydrocarbon oil, treating hydrocarbon oil, petroleum industry, etc., can solve the problems of non-environmental protection, extraction agent pollution, and low desulfurization rate, and achieve good reproducibility, Good effect and simple desulfurization method

Active Publication Date: 2020-10-30
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current deep eutectic solvents mostly use organic solvents as hydrogen bond donors, which are not environmentally friendly, and the desulfurization rate is not high when applied to extraction desulfurization
In addition, when the extraction agent is regenerated, organic solvents such as ether and other stripping agents are often added to strip the sulfur components. The addition of organic solvents during the regeneration process will cause environmental pollution and pollution of the extraction agent after regeneration.

Method used

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  • A kind of water-based deep eutectic solvent and its preparation method and a kind of oil extraction desulfurization method
  • A kind of water-based deep eutectic solvent and its preparation method and a kind of oil extraction desulfurization method
  • A kind of water-based deep eutectic solvent and its preparation method and a kind of oil extraction desulfurization method

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preparation example Construction

[0047] The present invention provides the preparation method of water-based deep eutectic solvent described in above-mentioned scheme, comprises the following steps:

[0048] The hydrogen bond acceptor is mixed with water under the condition of 20-80 DEG C to obtain a water-based deep eutectic solvent; the hydrogen bond acceptor is quaternary ammonium salt and / or quaternary phosphonium salt.

[0049] In the present invention, the mixing temperature is 20-80°C, preferably 30-60°C, more preferably 40°C; the present invention preferably mixes under stirring conditions, and the stirring speed is preferably 100-1000rpm, It is preferably 300-600 rpm; the stirring time is preferably 0.01-3 h, more preferably 0.2-1 h. In the invention, the hydrogen bond donor and the hydrogen bond acceptor can be directly mixed under the condition of 20-80 DEG C, and the preparation method is simple.

[0050] In a specific embodiment of the present invention, it is preferred to mix the hydrogen bond ...

Embodiment 1

[0073] Add 5g of tetrabutylphosphorus bromide and 0.53g of water into the flask, heat up to 40°C under normal pressure stirring, stirring at a speed of 500rpm, and stir for 30min to obtain a clear and transparent water-based deep eutectic solvent.

[0074] Add 5g of synthetic water-based deep eutectic solvent and 5g of model oil containing 500ppm sulfur (dibenzothiophene) into the flask, stir for 30min at normal pressure and temperature of 25°C, stirring speed is 800rpm, and stand for 30min Layer, the oil phase is separated from the extract phase by decantation, and the extract phase is recycled through the subsequent regeneration operation to recover the deep eutectic solvent for reuse.

[0075] The sulfur content of the upper oil phase was accurately detected with a sulfur and nitrogen analyzer, and the results showed that the sulfur content of the upper oil phase dropped to 148ppm, and the single-stage desulfurization rate was 70.4%.

Embodiment 2

[0077] Add 5g of tetrabutylphosphine bromide and 0.79g of water into the flask, heat up to 40°C under normal pressure stirring, stirring at 500rpm, and stir for 30min to obtain a clear and transparent water-based deep eutectic solvent.

[0078] Add 5g of synthetic water-based deep eutectic solvent and 5g of model oil containing 500ppm sulfur (dibenzothiophene) into the flask, stir for 30min at normal pressure and temperature of 25°C, stirring speed is 800rpm, and stand for 30min Layer, the oil phase is separated from the extract phase by decantation, and the extract phase is recycled through the subsequent regeneration operation to recover the deep eutectic solvent for reuse.

[0079] The sulfur content of the upper oil phase was accurately detected with a sulfur and nitrogen analyzer, and the results showed that the sulfur content of the upper oil phase dropped to 166ppm, and the single-stage desulfurization rate was 66.8%.

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Abstract

The invention provides a water-based eutectic solvent, a preparation method thereof and an oil extraction and desulfurization method, and belongs to the technical field of desulfurization. A hydrogenbond acceptor of the water-based eutectic solvent provided by the invention is a quaternary ammonium salt and / or a quaternary phosphonium salt, a hydrogen bond donor is water, and an organic solvent is used as the hydrogen bond donor compared with a conventional eutectic solvent. The water-based eutectic solvent provided by the invention is greener and more environmentally-friendly, non-corrosive,high in desulfurization capability, and good in renewability; and when the water-based eutectic solvent provided by the invention is used as an extractant for oil desulfurization, a desulfurization process and an extractant regeneration process can be controlled by adjusting the content of the hydrogen bond donor water, without adding other substances such as a back-extractant, so that neither oil nor the extractant can be contaminated by the back-extractant in an entire desulfurization system, the environment also cannot be contaminated, and in the entire desulfurization process and extractant regeneration process, the conditions are mild, and the operation is simple and easy for being continuous, thereby being suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of desulfurization of oil products, in particular to a water-based deep eutectic solvent and a preparation method thereof, and a method for extracting desulfurization of oil products. Background technique [0002] The rapid development of industry has brought more and more serious pollution to the environment, especially the burning of sulfur compounds. The SOx produced by the combustion of sulfur-containing compounds in fuel oil can strongly stimulate the mucous membranes of the human body and the respiratory tract, and seriously cause bronchitis and even pulmonary edema and respiratory paralysis. In addition, SO emitted into the air 2 It will react with water vapor to form sulfuric acid rain, which seriously pollutes the environment. [0003] Under the circumstances that environmental problems need to be solved urgently, the country has set increasingly strict standards for the sulfur content in fuel oil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G21/27C10G21/28
CPCC10G21/27C10G21/28C10G2300/202
Inventor 成洪业刘崇阳漆志文陈立芳
Owner EAST CHINA UNIV OF SCI & TECH