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A method for treating oily waste using a switch-type mixed solvent system

A mixed solvent system, switch-type solvent technology, used in separation methods, sludge treatment, chemical instruments and methods, etc., can solve the problems of low solvent recovery rate, low oil recovery efficiency, and high processing price, and achieve high recovery costs. The effect of harmless treatment and simplified treatment process

Active Publication Date: 2021-05-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the invention is to solve the problem of using CO 2 / N 2 There are problems such as low oil recovery efficiency, long treatment cycle, low solvent recovery rate, difficult recovery, high treatment price and serious secondary pollution in switch solvent treatment sludge.

Method used

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  • A method for treating oily waste using a switch-type mixed solvent system
  • A method for treating oily waste using a switch-type mixed solvent system
  • A method for treating oily waste using a switch-type mixed solvent system

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Embodiment 1

[0033] figure 1 A schematic flow chart of the present invention for treating waste oily waste using a mixed solvent system of switching solvent and tertiary amine bicarbonate solution is given. The concrete steps of this method are as follows:

[0034] Step S1, preparation of mixed solvent system

[0035] At room temperature of 25-30°C, mix N,N-dimethylcyclohexylamine and deionized water at a mass ratio of 1:99-99:1, and then pass CO into the mixture 2Gas, wherein the ventilation rate is 0.01-1.0L / min; the pH value of the solution is monitored online during the ventilation process, until the pH value of the solution remains unchanged, the ventilation is stopped, indicating that the mass concentration is 10-90% tertiary amine bicarbonate solution preparation Complete; mix the prepared tertiary amine bicarbonate solution with the switch-type solvent N,N-dimethylcyclohexylamine according to the volume ratio of 10:1 to 1:10 to form a mixed solvent system, which is divided into m...

Embodiment 2

[0043] The steps of the treatment method are the same as those in Example 1, except that the mixed solvent system is N,N-dimethylbutylamine and its bicarbonate solution.

Embodiment 3

[0045] The steps of the treatment method are the same as in Example 1, except that the mixed solvent system is triethylamine and its bicarbonate solution.

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Abstract

The invention discloses a method for treating oily wastes using a switch-type mixed solvent system, comprising the following steps: S1, mixing tertiary amines with water, feeding CO 2 , to prepare a tertiary amine bicarbonate solution, and then mix the solution with a switch-type solvent to form a mixed solvent system; S2, mix the oily waste with the mixed solvent system, and after fully cleaning, centrifuge to remove solid residues to obtain a treatment solution; S3, passing CO into the treatment liquid 2 , after fully reacting, the oil phase and the water phase are separated into layers; S4, the water phase is heated, or the N 2 Or Ar separates most of the switch-type solvent in the water phase, and a small part of the switch-type solvent stays in the water phase to re-form a mixed solvent system, repeat steps S2, S3 and S4, and recycle the mixed solvent system. The method of the invention treats the oily waste, the reaction conditions are mild, the mixed solvent can be recycled and reused, the treatment cost is reduced, and the economical, green and harmless treatment of the oily solid waste is realized.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a method for treating waste oily sludge and oil sand using a switch-type mixed solvent system. Background technique [0002] A large amount of oily waste will be generated in the process of oil exploration, production, transportation and processing. For oily sludge and oil sand, it should be recovered first, and then discharged after being treated up to the standard. Oily sludge and oil sands are national hazardous wastes because they contain oil, heavy metals, organic matter and other pollutants. If they are discharged directly without treatment, they will cause serious harm to the surrounding ecological environment. At the same time, oily sludge and oil sands have an oil content as high as 10-30%, and should be recycled for reuse. [0003] At present, the treatment technologies of oily sludge and oil sand mainly include supercritical fluid extraction, incine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F1/40
CPCC02F1/40C02F11/00
Inventor 鲁红升赵吉合黄志宇王兵
Owner SOUTHWEST PETROLEUM UNIV