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Crude oil desalting method based on coupling of solvent extraction and electric desalting

An electric desalination and extraction technology, which is applied in the petroleum industry, hydrocarbon oil treatment, and multi-stage series-connected refining process treatment, etc., can solve the problems of insignificant desalination and dehydration effect of crude oil, complicated synthesis steps of desalting agent, and complicated preparation of compound agent. , to achieve the effect of a wide range of applications, low requirements and good solubility

Active Publication Date: 2018-05-04
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0005] Chinese patent CN101987965A discloses "a composite desalting agent suitable for crude oil desalting". The desalting agent can be used for the electric desalting of crude oil. Rod clay is copolymerized, and has certain requirements for the salt content in crude oil: the iron content is less than 200μg / g; the calcium content is less than 2000μg / g; the calcium content can only be reduced to 18μg / g, and the entire electric desalination reaction process takes 7 hours
[0006] Chinese patent CN105482848A discloses "a compound agent for crude oil desalination and its preparation method". The preparation of the compound agent is complicated, and it is necessary to prepare a corresponding proportion of maleic anhydride modified phenolamine polyether compound, phase transfer agent, organic amine, asphalt rubber dispersants and additives, and the desalination and dehydration effect of crude oil with low colloid and low asphaltenes is not obvious. The pretreatment of crude oil needs to be manually mixed 200 times, which is too cumbersome. The salt content can only be reached after three stages of electric desalting 2.65mg / L
[0012] The current industrialized crude oil desalting process is mainly carried out by water injection and demulsifier addition, which is affected by factors such as water injection volume, demulsifier type and dosage, desalination temperature, electric field strength, mixing intensity, residence time, etc. Therefore, the emulsification phenomenon is serious , and the existing process cannot completely solve the problem of emulsification, therefore, demulsification (chemical) to achieve phase separation has become the key to improving desalination efficiency

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  • Crude oil desalting method based on coupling of solvent extraction and electric desalting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] see figure 1 . A crude oil desalting method based on the coupling of solvent extraction and electric desalting, using heavy crude oil from Shengli Oilfield (crude oil density: 0.9040-0.9660g / cm 3 ) and Qilu Petrochemical’s high-density extra-heavy crude oil (crude oil density: ﹥0.9660g / cm 3 ), the physical properties of the two batches of crude oil are shown in Table 2.

[0040] Table 2. The physical property of the crude oil that embodiment 1 adopts

[0041] .

[0042] Contains the following steps:

[0043] (1) Inject the extractant

[0044] Use the high solubility of the extractant to salt to remove the salt contained in the crude oil: inject ethylene glycol (or use ethylene glycol, glycerol, 1,2-propanediol, 1,3- One or more of propylene glycol, diethylene glycol monomethyl ether, propylene glycol methyl ether, dipropylene glycol dimethyl ether, dimethylamine, dipropylamine, cyclopropylamine, diisobutylamine), the crude oil and ethylene glycol are The mass r...

Embodiment 2

[0056] see figure 1 . A crude oil desalting method based on the coupling of solvent extraction and electric desalting, the processed crude oil is the same as that in Example 1.

[0057] Contains the following steps:

[0058] (1) Inject the extractant

[0059] Inject glycerol (or 1,2-propanediol, 1,3-propanediol, diethylene glycol monomethyl ether, propylene glycol methyl ether, dipropylene glycol dimethyl ether, dimethylamine, dipropylamine, cyclopropylamine) into the crude oil , one or more of diisobutylamine); the crude oil and glycerol are fully mixed through a mixing valve at a mass ratio of 9:1 and then entered into a first-stage extraction and desalination tank.

[0060] (2) Primary extraction and desalination

[0061] Use an extraction temperature of 110°C, use a weak electric field of 600V / cm and a strong electric field of 1500V / cm for desalination, the electric field can be AC, DC or pulse electric field; stay in the weak electric field for 60 minutes, stay in the...

Embodiment 3

[0077] see figure 1 . A crude oil desalting method based on the coupling of solvent extraction and electric desalting, the processed crude oil is the same as that in Example 1.

[0078] Contains the following steps:

[0079] (1) Inject the extractant

[0080] Inject 1,2-propanediol and 1,3-propanediol (or diethylene glycol monomethyl ether, propylene glycol methyl ether, dipropylene glycol dimethyl ether, dimethylamine, dipropylamine, cyclopropylamine, diisobutyl One or more amines); the crude oil is fully mixed with 1,2-propanediol and 1,3-propanediol at a ratio of 20:0.5+0.5, and then enters the primary extraction and desalination tank.

[0081] (2) Primary extraction and desalination

[0082] Use an extraction temperature of 160°C, use a weak electric field of 450V / cm and a strong electric field of 750V / cm for desalination, and the electric field can use AC, DC or pulse electric field; stay in the weak electric field for 20 minutes, stay in the strong electric field for...

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Abstract

The invention relates to a crude oil desalting method based on solvent extraction and electro-desalting coupling. The treated object is crude oil with the density of 0.96g / cm3 to 1.2g / cm3 which is secondarily or tertiarily exploited and severely emulsified and, normally, can hardly be separated by settlement according to the difference between oil density and water density. The method includes the following steps: (1) extraction agent injection; (2) first-stage extraction desalting; (3) crude oil and extraction agent separation after first-stage extraction desalting; (4) secondary extraction agent injection; (5) second-stage extraction desalting; (6) crude oil and extraction agent separation after second-stage extraction desalting. More stages of extraction desalting can be added into the steps according to the requirement of desalting depth. By using extraction agent to replace water injection, adding demulsifier and adopting the solvent extraction and electro-desalting coupling method, the method can increase the efficiency of crude oil desalting, and the application range is wide; the method not only has low requirement on an electrical field, saving energy, but also is low in operation cost; and the method can utilize existing equipment to carry out desalting, and has a high-efficiency desalting effect.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a method for desalting crude oil based on the coupling of solvent extraction and electric desalting. Background technique [0002] Petroleum is still the main energy source in various countries at present. A certain amount of salt substances will be brought into the oil during the extraction process, and with the second or third extraction of crude oil, the salt content in the oil will increase, especially NaCl, CaCl 2 , MgCl 2 and other inorganic salts. Crude oil with high salt content is extremely harmful to subsequent processing, especially to processing equipment, such as: corrosion of equipment, scale accumulation affecting heat transfer, reducing catalyst activity, and clogging pipelines, etc. In addition, the processing technology is more complicated. Therefore, crude oil desalting and processing technology has always been a concern in the petrochemical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/04
CPCC10G53/04C10G2300/1033
Inventor 曹发海任满年李小安
Owner EAST CHINA UNIV OF SCI & TECH
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