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Method for removing sulphur in gasoline by electrochemical oxidation

An electrochemical and gasoline technology, applied in the field of electrochemical oxidation to remove sulfur in gasoline, can solve the problems of low selectivity of oxidative desulfurization reaction, expensive oxidant, etc., and achieve the effect of mild operating conditions and desulfurization octane number

Inactive Publication Date: 2009-06-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with catalytic hydrodesulfurization technology, the above method has the characteristics of high desulfurization rate, mild operating conditions, and simple equipment, but has the disadvantages of low selectivity of oxidative desulfurization reaction, expensive oxidants such as hydrogen peroxide and peroxyacid, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The flat graphite is the anode, the flat lead is the cathode, and the surface area of ​​the two electrodes is 4cm 2 , The diaphragm is sintered glass. The electrolytic system used is "H 2 O-EtOH-CH 3 COOH-NaCl". Weigh pure H 2 O 7.50g, EtOH (ethanol) 10.67g (13.50ml), CH 3 COOH (acetic acid) 1.58g (1.50ml), NaCl 1.98g (1.50mol / L). After mixing and stirring thoroughly, take out 3ml and add it to the cathode area, and add the rest to the anode area, and add 22.50ml of benzothiophene-cyclohexane organic solution with a content of 650g / mL. At this time, the agent-oil ratio is 1:1, and stir , at a constant temperature of 30°C, with a controlled electrolysis potential of 1700mV for 5 hours of constant potential electrolysis, the content of benzothiophene in cyclohexane decreased from 353mg / L to 32mg / L.

Embodiment 2

[0022] The electrodes and electrolytic system are the same as in Example 1. Weigh pure H 2 O 10.00g, EtOH 14.22g (18.00ml), CH 3 COOH 2.11g (2.00ml), NaCl 2.63g (1.50mol / L). After mixing and stirring thoroughly, take out 3ml and add it to the cathode area, and add the rest to the anode area, and add 15.00ml catalytic cracking gasoline. At this time, the ratio of agent to oil is 2:1, stir, keep the temperature at 30°C, and control the electrolysis potential to 1700mV for electrolysis for 6hr , the sulfur content in the oil sample was reduced from 235mg / L to 54mg / L.

Embodiment 3

[0024] Electrode and diaphragm are the same as embodiment 1. Weigh pure H 2 O 7.50g, EtOH 10.67g (13.50ml), CH 3 COOH 1.58g (1.50ml), NaCl 1.98g (1.50mol / L). After mixing and stirring, take out 3ml and add it to the cathode area, and add the rest to the anode area, and add 22.50ml of catalytic cracking gasoline. At this time, the ratio of agent to oil is 1:1, stir, keep the temperature at 30°C, and control the electrolysis potential to 1700mV for 5hr. , the sulfur content in the oil sample was reduced from 235mg / L to 67mg / L.

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Abstract

The present invention relates to a method to remove sulphur in gasolene by using electrochemistry measure, which comprises the following procedures: first mix gasolene with an electrolytic system that consists of polar solvent, supporting electrolyte and water and place the mixture into an isolated electric tank for electrolysis, then settling separate fat phase and electrolytic system phase, electrolytic oxidation product of sulfur-containing compound of gasoline enter into electrolytic system phase to be removed; volume ratio between gasolene and electrolytic system is 0.5-2; electrolytic temperature range is from 40 DEG C to 50 DEG C; supporting electrolytes / polar solvent is 0.1-2mol / L; volume ration between water and dissolvent is 0.1-1; polar solvent is one of acetic acid and ethyl hydrate or the mixture; supporting electrolytes is sodium chloride or sodium acetate; water is used to provide oxygen source in the process; operation condition is mild; dissolvent and supporting electrolytes can be used for periodic duty in electrolytic process; zero discharge can be realized primarily; hydrogen gas is produced secondarily; octane ratio lowing down problem because of hydrogenation in oil-extraction plant gasoline catalysis and cracking process can be solved.

Description

technical field [0001] The invention relates to an electrochemical oxidation method for oxidizing sulfur-containing compounds in gasoline into sulfone or sulfoxide sulfides with strong polarity and extracting them into the electrolytic system phase with strong polarity to remove them from oil products. Method for removing sulfur from gasoline. Background technique [0002] With the increasingly stringent environmental protection requirements and the tendency of heavy and inferior raw materials for gasoline production, the content of sulfur and aromatics in gasoline, especially catalytic gasoline, has increased, making it difficult to meet the requirements of clean oil production. Therefore, new technologies for gasoline desulfurization and aromatics reduction Research and development requirements are becoming more and more urgent. [0003] Catalytic hydrodesulfurization is currently the most important desulfurization method for light oil products. Ni-W and Mo-Ni catalysts a...

Claims

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Application Information

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IPC IPC(8): C10G32/02
Inventor 杨世成张志华郭立艳于宏伟齐泮仑王志刚韩有隆董平王西卫广生周奇宝张浩骆傲阳葛冬梅王琪丛丽茹
Owner PETROCHINA CO LTD
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