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Supercritical fluid cascade extraction and oxidative degradation coupling combined process for treating oily sludge

A technology of supercritical fluid and combined process, which is applied in the direction of oxidation treatment of sludge, only multi-stage series refining and cracking process treatment, sludge treatment, etc., can solve the problem of low resource utilization rate of petroleum hydrocarbon components and the treatment process Problems such as high energy consumption and difficulty in continuous processing achieve high industrial application prospects, high degree of continuous processing, and efficient resource utilization

Active Publication Date: 2018-08-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0006] Aiming at the problems existing in the process of treating oily sludge in the prior art, such as low resource utilization rate of petroleum hydrocarbon components, high energy consumption in the treatment process, complicated treatment process, difficulty in continuous treatment and difficulty in realizing harmless operation, etc.

Method used

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  • Supercritical fluid cascade extraction and oxidative degradation coupling combined process for treating oily sludge

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Embodiment approach 1

[0028] The oily sludge produced by crude oil extraction in an oil production plant in Shengli Oilfield has a moisture content of 40wt.% after pretreatment and dehydration, and a volume reduction rate of about 50%. The oily sludge enters the supercritical extractor 13 after being heated to 150° C. by the preheater 3 and the electric heater 4 .

Embodiment approach 2

[0030] The water content of the oily sludge produced by an offshore oil production platform in the Bohai Sea was reduced to 45wt.% after pretreatment and dehydration, and the volume reduction rate was about 40%. The oily sludge enters the supercritical reactor 13 after being heated to 200° C. by the preheater 3 and the electric heater 4 .

[0031] Preferably, methyl ethyl ketone peroxide is the oxidizing agent, and the supercritical reactor 13 is fed with the oxidizing agent from the storage tank 5, and the mass ratio of the regulating and controlling peroxygen is 250% (the mass ratio of the oxidizing agent to the oily sludge is 2.5:1), at a reaction pressure of 25 MPa, and a reaction temperature of 320 The oxidative degradation of petroleum hydrocarbon components is carried out under the condition of ℃. Then, n-pentane is selected as the main extraction agent, and the extraction agent is imported from the storage tank 6 to the supercritical reactor 13. The mass ratio of n-pen...

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Abstract

The invention discloses a supercritical treatment combination process for treating oily sludge, in particular to resourceization and harmlessization treatment of the oily sludge in the coupling oxidative degradation process and a supercritical state. The supercritical treatment combination process comprises the following operation steps: firstly, mixing the oily sludge with an oxidant under the conditions of supercritical temperature and pressure, and cracking heavy oil fractions in the oily sludge into light oil by a supercritical oxidation method; secondly, adding an extracting agent into the oily sludge, and realizing cascade separation operation of petroleum hydrocarbon components from small to large by regulating the overall polarity of the extracting agent. The combined technology disclosed by the invention has the advantages that the treatment effect on the oily sludge is good, the petroleum hydrocarbon components in the oily sludge can be lightened while harmlessization treatment of the oily sludge is realized; the petroleum hydrocarbon components are extracted according to the polarity sequence and resourceization utilization of the oily sludge is realized.

Description

technical field [0001] The invention relates to a recycling and harmless treatment process of oily sludge, specifically a combination of degrading heavy hydrocarbons in oily sludge by supercritical oxidation and coupling supercritical fluids of different polarities to carry out step separation of degraded oil products craft. Background technique [0002] Oily sludge is a mixture of crude oil and soil caused by various reasons, mainly from the processes of crude oil extraction, oil and gas transportation, and petroleum refining in the normal production system. The composition content of oily sludge varies greatly, mainly containing 20-50% oil, 30-50% water and 10-30% solid phase substances. It is a complex and stable O / W, W / O Emulsion system. In addition, different oil sludge may contain various bacteria, salts, heavy metal elements, polychlorinated biphenyls, radionuclides, dioxins and other refractory harmful substances. cause serious pollution. Therefore, the effectiv...

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Application Information

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IPC IPC(8): C02F11/00C02F11/06C02F11/12C10G55/02
CPCC02F11/002C02F11/06C02F11/12C10G55/02
Inventor 刘东王加宁梁玉海李志恒张俊峰赵明孔学殷长龙陈坤王丛丛张宏玉李美玉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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