A method for treating emulsified crude oil containing iron-containing sulfide solid particles

A technology for emulsification of crude oil and solid particles, which is used in the treatment of hydrocarbon oil, dehydration/demulsification by chemical methods, and the petroleum industry. Effect

Active Publication Date: 2020-08-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the principle of these two methods is to disperse FeS from the oil-water interface into the oil phase, thereby reducing its impact on the emulsified layer and drainage, but FeS is not removed from the crude oil, so its impact on subsequent processing cannot be eliminated
[0008] U.S. patent application US4,722,781 (1988) discloses a method for processing water-insoluble FeS crude oil, that is, to extract the electric desalted emulsion layer, return most of it to the crude oil, and add light diluent oil to the other part. This method may be used for light crude oil It is suitable, but for heavy crude oil, the reuse of the emulsified layer to the crude oil will aggravate the deterioration of electrical desalting, generate more emulsified layers, and form a vicious circle
[0009] U.S. Patent Application US 5,080,779 (1992) discloses a method for removing FeS from crude oil, that is, adding a chelating agent, such as oxalic acid, EDTA, etc., in the injection water. This method is applicable to crude oil with low FeS content, but when When the content of iron sulfide solid particles is high, the amount of chelating agent used is quite large, and other metal ions (such as Na) will be introduced into the crude oil or the chelating agent itself will cause corrosion problems

Method used

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  • A method for treating emulsified crude oil containing iron-containing sulfide solid particles

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preparation example Construction

[0025] Wherein, the preparation method of the alkyl ester of styrene-maleic anhydride copolymer (can refer to CN101352666A) can comprise: first prepare styrene-maleic anhydride copolymer, then carry out styrene-maleic anhydride copolymer and fatty alcohol Esterification reaction.

[0026] Styrene-maleic anhydride copolymer can be prepared by conventional method, preferably adopt solution polymerization method to prepare, specifically, with aromatic hydrocarbon such as benzene, toluene, xylene as solvent, under initiator effect, styrene and maleic anhydride Carry out the polymerization reaction, the product is precipitated from the solution as fine white particles, and the solvent can be removed by filtration to obtain the styrene-maleic anhydride copolymer. Preferably, the molar ratio of styrene and maleic anhydride used in the reaction is (0.8-1.5):1, more preferably (0.9-1.1):1.

[0027] The styrene used needs to be pretreated before use to remove the polymerization inhibit...

preparation example 1

[0060] This preparation example is used to illustrate the preparation method of styrene-maleic anhydride copolymer octadecyl ester (stearyl alcohol SMA).

[0061] Add 9.8g of maleic anhydride and 60ml of toluene to the three-necked flask, dissolve at 60°C, add 10.3g of styrene and 0.2g of dodecyl mercaptan, and add dropwise 0.24g of BPO dissolved in it at 85±5°C 40ml of toluene solution was reacted for 6h and filtered, and the product was vacuum-dried at 80°C for 4h to obtain a styrene-maleic anhydride copolymer (SMA) with a molecular weight of 5000. Add 100ml of toluene in the there-necked flask, add SMA64g (0.032mol), stearyl alcohol 8.6g, p-toluenesulfonic acid 0.5g, after reflux reaction 1h, install water separator, reflux divide water 6h, obtain the degree of esterification as 90% styrene-maleic anhydride copolymer stearyl A1.

preparation example 2

[0063] This preparation example is used to illustrate the preparation method of styrene-maleic anhydride copolymer cetyl ester (cetyl alcohol SMA).

[0064] According to the method of Preparation Example 1, the difference is that 8.6 g of stearyl alcohol was replaced by 7.7 g of cetyl alcohol to obtain styrene-maleic anhydride copolymer cetyl ester A2.

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Abstract

The invention relates to the field of petrochemical industry, and discloses a method for processing emulsified crude oil containing iron sulfide solid particles. The method includes (1), mixing the emulsified crude oil with water and an oil-soluble demulsifier and carrying out first-stage electro-desalting treatment to obtain a mixture; (2), subjecting the mixture obtained in the step (1) to second-stage electro-desalting treatment. By application of the method, oil and water intermediate layer can be thinned, oil content of water discharged can be reduced, and iron sulfide solid particles canbe washed into water phase, so that influence from iron sulfide solid particles to subsequent process can be reduced.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a method for treating emulsified crude oil containing iron-containing sulfide solid particles. Background technique [0002] Crude oil contains impurities including salts, sediments and water (Bs&W), solids and metals that can cause corrosion, heat exchanger fouling, furnace coking, catalyst deactivation and product quality degradation. [0003] Salts in crude oil include chloride salts of sodium, calcium, and magnesium, among which NaCl is the main one. These chloride salts are hydrolyzed during atmospheric distillation to generate corrosive HCl, which leads to corrosion at the top of the fractionation tower. Therefore, the refinery needs to remove the salt in the crude oil through the electric desalting process. [0004] Solids in crude oil include sediment, clay, volcanic ash, drilling mud, ferrous sulfide, scale, etc. On the one hand, these solids lead to scaling, wear,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G33/04C10G33/08C10G21/02C10G21/16C10G21/26
CPCC10G21/02C10G21/16C10G21/26C10G33/04C10G33/08C10G2300/202C10G2300/205
Inventor 王振宇沈明欢于丽李本高
Owner CHINA PETROLEUM & CHEM CORP
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