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Method for treating oily sludge through multistage extraction-splitting coupling of supercritical fluid

A supercritical fluid and supercritical technology, applied in the field of oily sludge treatment, can solve the problems of high energy consumption, low degree of comprehensive utilization, difficulty in large-scale industrialization, etc., and achieve the effect of high removal rate

Active Publication Date: 2014-08-13
SHAANXI YANCHANG PETROLEUM GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problems of high energy consumption, easy to cause secondary pollution, low resource utilization rate, poor economy, difficulty in large-scale industrialization, low degree of comprehensive utilization, etc. In order to solve the problems of high colloidal heavy oil in oil sludge that cannot be effectively utilized, it is necessary to provide a supercritical fluid based supercritical fluid with simple process, excellent industrial application economy, green environmental protection, efficient utilization of crude oil resources in oil sludge and harmless treatment of oil sludge. Oily sludge recycling process based on multi-stage extraction and cracking coupling technology

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  • Method for treating oily sludge through multistage extraction-splitting coupling of supercritical fluid

Examples

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Effect test

Embodiment 1

[0031] Taking the oily sludge produced in the sewage workshop of an oil refinery in northern Shaanxi as an example, the oily sludge is composed of the bottom sludge of the oil separation tank of the sewage plant, biochemical sludge and flotation tank scum, and its initial water content is 97%. Organic matter 2% (of which light oil components with a boiling point below 300°C account for 0.7%, heavy oil components account for 1.3%), and mud content is 1%. The specific treatment methods are as follows:

[0032] 1. Reduction, separation and treatment of oily sludge

[0033] Such as figure 1 As shown, the oily sludge is injected into the oil sludge thickening tank 2 with the mud pump 1, and then the cationic polyacrylamide and the fatty alcohol polyoxyethylene ether AEO-9 reverse phase demulsifier with a weight average molecular weight of 10000 are added in a mass ratio of 10: The mixture of 1 is subjected to sedimentation and separation, and the total amount added is 0.5% of the ...

Embodiment 2

[0044] Taking the oily sludge at the bottom of a crude oil settling tank of a joint station of an oil production plant in northern Shaanxi as an example, its initial water content is 40%, and it contains 35% organic matter (of which light oil components with a boiling point below 300°C account for 8%, and heavy oil components Accounting for 27%), the mud content is 25%, the specific treatment method is as follows:

[0045] 1. Reduction, separation and treatment of oily sludge

[0046] Such as figure 1 As shown, the oily sludge is injected into the oil sludge thickening tank 2 with the mud pump 1, and then the mixture of amphoteric polyacrylamide and polyether F-68 with a weight average molecular weight of 12000 is added for sedimentation and separation at a mass ratio of 10:2. The total amount added is 0.3% of the mass of the oily sludge. After staying for 12 hours, the water in the upper part of the sludge concentration tank 2 is separated and reinjected to the sewage treatm...

Embodiment 3

[0057] Taking the "three muds" produced by the sewage workshop of an oil refinery in northern Shaanxi and the oil sludge at the bottom of a crude oil settlement tank of an oil production plant combined station in northern Shaanxi mixed at a mass ratio of 1:6 as an example, the initial water content is 45%, containing Organic matter 35% (of which light oil components with a boiling point below 300°C account for 8%, heavy oil components account for 27%), and mud content is 20%. The specific treatment methods are as follows:

[0058] 1. Reduction, separation and treatment of oily sludge

[0059] Such as figure 1 As shown, the oily sludge is injected into the oil sludge thickening tank 2 with the mud pump 1, and then the mixture of amphoteric polyacrylamide with a weight average molecular weight of 20,000 and polyether polyol 330N is added in a mass ratio of 10:5 for sedimentation and separation. The total amount added is 0.1% of the mass of the oily sludge. After staying for 10 ...

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Abstract

The invention discloses a method for treating oily sludge through the multistage extraction-splitting coupling of a supercritical fluid. Oily sludge is subjected to harmless treatment and resource utilization by using oily sludge reduction, hardening and tempering, flash evaporation, multistage supercritical fluid extraction-supercritical water-splitting coupling technologies, wherein light oil components can be obtained by flash evaporation, heavy oil, high phenols and polycyclic aromatic hydrocarbon can be obtained by various supercritical fluid gradient extractions, residual heavy colloids and asphaltene in oily sludge are split into propylene, butylene, light oil and heavy oil components by supercritical water-splitting, and the heavy oil components are utilized against by supercritical fluid extraction. The method disclosed by the invention can carry out system separation and comprehensive utilization on oily sludge; required equipment scale is small, industrial amplification is relatively easy; treated oily sludge is relatively high in organic matter removal rate, can reach landfill standards, and is high in treatment efficiency; and compared with traditional oily sludge treatment methods, the method can maximally recover petroleum resources, therefore, the method has a relatively high industrial economic value, and remarkable economic and environment-friendly comprehensive benefits.

Description

technical field [0001] The invention belongs to the technical field of oily sludge treatment, and in particular relates to a method for resourceful treatment of oily sludge based on supercritical fluid multistage extraction and cracking coupling technology. Background technique [0002] At present, the domestic existing methods for treating oily sludge include: incineration, coking, landfill, land cultivation, solvent extraction, pyrolysis technology, comprehensive utilization of oily sludge, solidification, chemical demulsification and biological Governance etc. Using these methods to treat oily sludge has not been widely implemented due to reasons such as high cost, low recovery rate of crude oil, and easy generation of secondary pollution. How to economically and harmlessly treat large-scale oily sludge and utilize the oil resources in it, especially how to effectively utilize the heavy oil resources contained in the oil sludge has always been the safety and environmenta...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/14C10G1/00C10G1/04C10G1/02
Inventor 杨东元扈广法齐永红王燕李霁阳许磊
Owner SHAANXI YANCHANG PETROLEUM GRP
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