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Crude oil electric desalting dewatering process

A technology for electrical desalination and dehydration, crude oil, applied in the field of ultrasonic and pulse removal of salt and water in hydrocarbon oil, can solve the problems of high electric field strength, easy to produce emulsification, unable to handle low-quality high-density crude oil, etc., to enhance the mixing effect , Improve the oil-water separation efficiency, the effect of fast oil-water separation

Inactive Publication Date: 2009-07-08
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] For the technology of applying pulse electric field to crude oil desalting, CN101037612A proposes to use pulse voltage electric desalting technology to remove water and salt in crude oil. cm 3 The following crude oil works well, but it cannot meet the requirements of many refineries to deal with many low-quality high-density crude oils, and the electric field strength is too high, which is easy to produce emulsification

Method used

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  • Crude oil electric desalting dewatering process
  • Crude oil electric desalting dewatering process
  • Crude oil electric desalting dewatering process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Crude oil density is 934.1Kg / m 3 , the water content is 0.05%, the salt content is 132.6mgNaCl / L, the demulsifier is water-soluble ERI1160, the water injection is fresh water PH=7, and the desalination temperature is 135°C.

[0022] The dosage of primary desalination demulsifier is 20μg / g, water injection is 8%, the mixing frequency is 20kHz, and the sound intensity is 0.6w / cm 2 Ultrasonic wave for 1 minute, plus an electric field intensity of 800V / cm, a duty ratio of 50%, and a pulse frequency of 100Hz for 40 minutes; the addition of the secondary desalination demulsifier is 10μg / g, water injection is 6%, and the frequency after mixing is 20kHz , the sound intensity is 0.6w / cm 2 Ultrasonic wave for 1 minute, plus an electric field intensity of 800V / cm, a duty cycle of 50%, and a pulse frequency of 100Hz for 40 minutes; the addition of the three-stage desalination demulsifier is 10μg / g, water injection is 5%, and the frequency after mixing is 20kHz , the sound intensi...

Embodiment 2

[0026] The density of a crude oil is 934.1Kg / m 3 , the water content is 0.05%, the salt content is 132.6mgNaCl / L, the demulsifier is water-soluble ERI1160, the water injection is fresh water PH=7, and the desalination temperature is 135°C.

[0027] The dosage of primary desalination demulsifier is 15μg / g, water injection is 8%, the frequency after mixing is 20kHz, and the sound intensity is 0.6w / cm 2 Ultrasonic wave for 1 minute, plus an electric field intensity of 800V / cm, a duty cycle of 50%, and a pulse frequency of 100Hz for 40 minutes; the addition of the secondary desalination demulsifier is 8μg / g, water injection is 6%, and the frequency after mixing is 20kHz , the sound intensity is 0.6w / cm 2 Ultrasonic wave for 1 minute, plus an electric field intensity of 800V / cm, a duty cycle of 50%, and a pulse frequency of 100Hz for 40 minutes; the addition of the three-stage desalination demulsifier is 5μg / g, water injection is 5%, and the frequency after mixing is 20kHz , the ...

Embodiment 3

[0030] Embodiment 3 (comparative example)

[0031] The desalination in this example uses an ordinary full-impedance transformer to apply an electric field to the crude oil, and compares it with the new combined electric desalination technology, mainly comparing the injection amount of demulsifier, desalination rate and power consumption.

[0032] The density of a crude oil is 934.1Kg / m 3 , the water content is 0.05%, the salt content is 132.6mgNaCl / L, the demulsifier is water-soluble ERI1160, the water injection is fresh water PH=7, and the desalination temperature is 135°C.

[0033] The amount of the primary desalting demulsifier is 20 μg / g, inject 8% of water, and apply an alternating current with an electric field strength of 800V / cm for 40 minutes after mixing; the amount of the secondary desalting demulsifier is 10 μg / g, inject 6% of water, and apply an electric field after mixing Alternating current with an intensity of 800V / cm for 40 minutes; the amount of three-stage ...

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Abstract

The invention discloses a method for performing electrostatic desalting and dehydration on crude oil, which comprises the following steps: heating the crude oil to a temperature of between 115 and 155 DEG C; pouring water of which the weight is between 3 and 8 percent of the total weight of the crude oil to the crude oil; adding a demulsifier of which the weight between 0 and 25 micrograms per gram of the total weight of the crude oil to the mixture; mixing the materials in an active region with the ultrasonic frequency of between 20 and 40 kHz and the intensity of sound of between 0.5 w / cm<-2> and 0.75 w / cm<-2> for 1 to 5 minutes; keeping the mixture in a desalting and dehydrating tank in an electric field with the pulse electrical field strength of between 600 V / cm and 2,000 V / cm, the duty ratio of between 15 and 50 percent and the frequency of between 100 and 800 Hz for 25 to 50 minutes; and separating out sewage to obtain the purified crude oil which meets the requirement on salt content and is taken out of the device. The method can save more than 50 percent of electric energy.

Description

technical field [0001] The invention relates to refining hydrocarbon oil by electric method or magnetic method, in particular to a method for removing salt and water in hydrocarbon oil by ultrasonic wave and pulse. Background technique [0002] During the extraction of crude oil in the oil field, a large amount of water and emulsifiers need to be injected into the oil extraction, so that the extracted crude oil contains some water, and the degree of oil-water emulsification is serious. Moreover, depending on the development period of the oil field and the enhanced extraction method, the range of water content in the crude oil also varies. bigger. Due to the existence of oil-water emulsion in crude oil, it increases the storage and transportation burden for oil fields. At the same time, due to the existence of water and other impurities, the corrosion rate of crude oil storage tanks and oil pipelines increases, reducing their life. [0003] In the oil processing process of t...

Claims

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Application Information

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IPC IPC(8): C10G32/02
CPCC10G31/08C10G32/02
Inventor 崔新安汪实彬刘家国袁海欣刘英
Owner CHINA PETROCHEMICAL CORP
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