Catalytic oxidation electrolytic desulfurization method for light oil
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A technology of electrolytic desulfurization and catalytic oxidation, which is used in the petroleum industry, treatment of hydrocarbon oil, and multi-stage series refining process treatment, etc., to achieve the effect of mild operation
Inactive Publication Date: 2019-02-01
辽宁金品石油化工有限公司
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At the same time, the cathodic electrolysis produces hydrogen gas
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Embodiment 1
[0016] Embodiment 1: take flat graphite as the anode, the stainless steel plate as the negative plate, and the surface area of the two poles is 14cm 3 Electrolysis system: 10g of formic acid, 5.8g of acetic acid, 7.5g of methanol, 10.6g of ethanol, 2g of sodium chloride, 3g of catalyst lanthanum oxide, add 22ml of a solution with a dibenzothiophene content of 850g / ml, and stir with an oil to solvent ratio of 10:2 constant temperature 40 o C, the content of dibenzothiophene was reduced to 40g / ml by electrolysis at a control potential of 1700mv for 5min.
Embodiment 2
[0017] Embodiment 2: take the flat graphite as the anode, the stainless steel plate as the negative plate, and the surface area of the two poles is 14cm 3 The electrolysis system is used: the electrode and the electrolysis system are the same as the example: water 30g formic acid 2.11g, acetic acid 2.63g, methanol 14.22g, ethanol 18g, catalyst lanthanum oxide 3g, add 25ml dibenzothiophene 1000g / ml, the oil-soluble ratio is 15:3 Stirring constant temperature 50 o C, control potential 1800mv, electrolysis 10min dibenzothiophene content down to 30g / ml.
Embodiment 3
[0019] Take the flat graphite anode plate and stainless steel plate as the cathode plate with a total area of 2m 2 put in 1.5m 3 In the middle of the desulfurization plate in the non-desulfurization tank, the light oil is composed of naphtha and diesel oil, totaling 1.2 m 3 , the water phase is 20% of the liquid level of the desulfurization tank, add methanol, ethanol, mix 20kg, ethanol 12kg, methanol 8kg, oxidant, formic acid, acetic acid 10kg, formic acid 4kg, acetic acid 6kg. Combination Light Oil 1.2m 3 , oil sulfur content 1350mg / m 3 , voltage 48V, current 100A, electrolysis 5min, sulfur content dropped from 1350ppm to 565ppm.
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Abstract
The invention provides a catalytic oxidation electrolytic desulfurization method for light oil. The method is mainly characterized in that: an electrolytic system composed of a solvent, an oxidant, acatalyst, an electrolyte and water is mixed in an electrolytic tank for electrolysis, a carbon graphite plate serves as the positive electrode, a stainless steel plate serves as the negative electrode, settling separation of an oil phase and the mixed system is carried out, and an electrolytic oxidation product of a sulfur compound in the oil is subjected to electrolytic system removal. The methodhas the advantages that: water supplies the oxygen source for reaction, no external supply of hydrogen and oxygen is not needed, the operation is mild, the process is carried out under low temperature and atmospheric pressure, the solvent supports the recycling of the electrolyte in the electrolysis process, and at the same time zero emission is achieved. The by-product is hydrogen, is free of polluting gas, can achieve up-to-standard discharge, or the hydrogen can be recovered, thus reaching the purpose of deep desulfurization.
Description
technical field [0001] The invention relates to a mixed application of graded oil produced in petrochemical refining industry and petroleum refining process and light oil with low grade and high sulfur content produced in light oil production, especially a kind of catalytic oxidation of light oil Electrolytic desulfurization method. Background technique [0002] With the strengthening of environmental protection, the emission standards of fuel combustion exhaust are gradually strengthened. From the current National V emission standard, it has moved towards the National VI standard. Therefore, the national standards for light oil are constantly being adjusted and improved, so research on light oil desulfurization and hydrocarbon reduction technologies is becoming more and more urgent. Catalytic hydrogenation is currently the main method for light desulfurization. Usually molybdenum-nickel series catalyst is used in the hydrogenation process, the partial pressure is 3-4mpa, ...
Claims
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