Method for processing oily sludge through supercutical fluid

Abstract

The invention relates to a method for processing oily sludge through a supercutical fluid. The method comprises the steps of extracting the fuel oil from a routine preprocessed oily sludge due to the mutual effect of the supercutical fluid and a carrying agent under a certain temperature and pressure, wherein the extracting temperature is 35-80 DEG C, the pressure is 15-50 MPa, the separation temperature of a separator is 20-45 DEG C and the separation pressure is normal pressure-5 MPa; the supercutical fluid is supercritical carbon dioxide; and the carrying agent is one or more mixtures of methylene dichloride, ethyl acetate, acetone, petroleum ether and acetonitrile. The method has the following advantages that by adopting the method for processing the oily sludge through the supercutical fluid, the oily sludge is processed through a supercutical fluid extracting technology; the method is simple in process flow, high in processing efficiency, low in investment running cost and complete in oily sludge treatment; and the processed sludge can reach the national emission standard, the secondary pollution cannot be caused in the treatment process and the method is an environment-friendly green treatment process.

Description

technical field [0001] The invention relates to the technical field of oily sludge treatment and resource utilization, in particular to a method for supercritical fluid treatment of oily sludge. Background technique [0002] Oily sludge is a pollutant produced in the production process and gathering and transportation process of oilfields, and it is a major problem affecting the oilfield and surrounding environment and the sustainable development of oilfield economy. At present, oily sludge has been listed as oily waste in the "National Hazardous Waste Catalog", and the "National Cleaner Production Promotion Law" requires that oily sludge must be treated in a harmless manner. In addition, the oil content in oily sludge is 10-30%. Therefore, these oily sludges are valuable secondary resources. Collecting and processing these oily sludges can not only eliminate environmental pollution and generate environmental benefits, but also recycle The fuel oil can be recycled and reuse...

AI Technical Summary

Problems solved by technology

[0004] (1) Solidified landfill: Landfill sites not only waste land resources, but also have the risk of polluting groundwater;

[0005] (2) pyrolysis method: high investment in pyrolysis method equipment; oxidation method needs to be carried out under high temperature and high pressure, and the processing cost is high;

[0006] (3) incineration: the incineration method needs auxiliary combustion, and the cost is high, and it is easy to produce secondary pollution to the atmosphere, which wastes crude oil resources;

[0007] (4) Biodegradation method: the biodegradation method has too long treatment cycle, slow effect, is greatly affected by environmental factors, and crude oil resources cannot be recycled;

[0009] There are some problems in the above methods, and there are limitations in practical application. Organic solvent extraction is an effective method for recovering crude oil at present. In the invention patent of CN1526797A, a supercritical fluid treatment method for oily sludge is proposed. Extraction method is a method for recovering fuel oil from oily sludge, but this method needs to add dilute acid to assist extraction during the extraction process, dilute acid will corrode equipment, and will cause secondary pollution; the patent No. CN101734834A is proposed in the invention patent A sandy oily sludge recovery method has been proposed. The process of the method is complicated, and a large amount of organic solvent is used. The organic solvent needs to be recovered by distillation, resulting in increased energy consumption, a large amount of organic solvent consumption, and increased costs.

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