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Method of ultrasound-enhanced supercritical extraction of oil sludge

An ultrasonic strengthening and supercritical technology, which is applied in chemical instruments and methods, petroleum industry, sludge treatment, etc., can solve the problems of high emulsification degree of oil sludge, low extraction efficiency, long extraction time, etc.

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high degree of emulsification of sludge, many solid impurities, and a complex water-oil-solid stable structure, conventional extraction or supercritical extraction methods require long extraction time and low extraction efficiency, which limits its application.

Method used

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  • Method of ultrasound-enhanced supercritical extraction of oil sludge
  • Method of ultrasound-enhanced supercritical extraction of oil sludge
  • Method of ultrasound-enhanced supercritical extraction of oil sludge

Examples

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specific Embodiment 1

[0025] The specific embodiment of the present invention is described by taking oil sludge at the bottom of a refinery oil tank as an example. Oil sludge contains 65 wt% of oil, 18 wt% of water, and the rest is solid matter. Select CO 2 as a supercritical extractant. The ultrasonic power density is 100W / L, the frequency is 20kHz, and the irradiation mode is 6s / 6s (ultrasonic continuous irradiation time / ultrasonic intermittent time). The consumption of extractant and oil sludge is 30ml / g (oil sludge raw material).

[0026] The oil sludge is dehydrated by mechanical stirring and then sent to the supercritical extraction kettle. The ultrasonic strengthening method adopts a built-in plug-in type. The ultrasonic transducer is directly placed in the extraction tank. The ultrasonic generator transmits the electric energy converted into ultrasonic frequency to the transducer, and then the transducer converts the electric energy into ultrasonic mechanical energy. From storage tank (...

specific Embodiment 2

[0027] The specific embodiment of the present invention is described by taking oil sludge at the bottom of a refinery oil tank as an example. Oil sludge contains 65% oil, 18% water, and the rest is solid matter. Ethane was chosen as the supercritical extractant. The extraction temperature is 30-100°C, the extraction pressure is 5-8MPa, the amount of extractant and sludge is 40ml / g (sludge raw material), and the extraction time is 2.5h. The ultrasonic power density is 80W / L, the frequency is 20kHz, and the irradiation mode is 6s / 6s (ultrasonic continuous irradiation time / ultrasonic intermittent time). The technical process is the same as in Example 1, and the extraction rate of oil sludge is 95%-99% (mass).

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Abstract

The invention discloses a method of ultrasound-enhanced supercritical extraction of oil sludge. Oil sludge and extractants are added into a supercritical extraction device with an enhanced ultrasound device, and the supercritical extraction pressure and the supercritical extraction temperature are set for supercritical extraction. Compared with the prior art, the technology of the ultrasound-enhanced supercritical extraction is adopted in the method, so the extraction pressure and temperature are reduced, the extraction time is shortened, and finally the extraction efficiency is improved.

Description

technical field [0001] The invention relates to a treatment method for oily sludge, in particular to a method for separating oily sludge by means of an extraction method. Background technique [0002] Oil sludge mainly refers to the oily sludge formed by crude oil or other oil products and soil due to various reasons, as well as the oily sediment brought out by the system in the normal production of oilfields. It is a solid waste rich in mineral oil. The ingredients are crude oil, mud and water. The size of solid particles can range from sub-microns to several inches, most of which are between 1 and 100 microns. The composition of oil depends on the type of crude oil, refinery structure and operating conditions. The composition of sludge may change over time. Usually the sludge contains a certain amount of crude oil (5% to 80% in mass concentration), heavy metal ions (such as iron, copper, nickel, etc.) and inorganic salts (5% to 20% in mass concentration) compounds, etc. ...

Claims

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Application Information

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IPC IPC(8): C10G21/08C10G21/14C10G53/04C02F11/00
Inventor 赵昕回军赵景霞杨丽刘春阳
Owner CHINA PETROLEUM & CHEM CORP
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