Method for treating irrigation sediment by using surfactant pretreatment-hydrothermal oxidation-thermal cracking coupling method

Abstract

The invention discloses a method for treating irrigation sediment by using a surfactant pretreatment-hydrothermal oxidation-thermal cracking coupling method. The method comprises the following steps of firstly, adding a surfactant to preliminarily destroy an oil-water mixed system and an oil-mud colloid system; performing pretreatment filtration dehydration, deeply destroying an emulsifying structure and a micellar structure by utilizing the characteristic of high ionization degree of water in a hydrothermal oxidation process and utilizing the oxidation characteristic of an oxidant, carrying out thermal catalytic oxidation on pretreated and dehydrated tank bottom muddy water, filtering, further dehydrating to obtain crude oil containing a very small amount of water and mud, filtering the crude oil containing a very small amount of water and mud, and separating the crude oil and oil-containing mud sand, recovering the crude oil; and carrying out thermal cracking on the separated mud sand containing a small amount of crude oil to recycle part of light oil so as to obtain mud sand with the organic matter content of less than 1%. The method is simple and convenient in operation process, the equipment requirement is low, the method is green and environment-friendly, the technical difficulties of low energy consumption and high cost in the prior art can be solved, and technical advantages and engineering application value are large.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for treating bottom mud, in particular to a method for treating bottom mud by using a surfactant pretreatment-hydrothermal oxidation-thermal cracking coupling method. Background technique [0002] When storing oil products, especially crude oil, in oil tanks for a long time, the high melting point wax, asphaltene, colloid and some impurities (such as sand, soil, etc.) of oil products will settle in the oil tank together with water due to density difference At the bottom, a black gel is formed, that is, tank bottom sludge, in which oil, water and mud are in a highly dispersed and emulsified state, which is difficult to separate. Tank bottom sludge is a kind of oily sludge, and the cost of sewage discharge is high. Direct discharge will pollute the environment and cause waste of petroleum resources. Therefore, how to deal with tank bottom sludge has become an urgen...

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Problems solved by technology

[0003] At present, the main treatment methods for tank bottom sludge are extraction and thermochemical methods, which have the disadvantages of high energy consumption and high treatment costs.

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