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A kind of demulsifier and its preparation method and application

A technology of demulsifier and polymerization reaction, which is applied in the direction of dehydration/demulsification by chemical methods, and can solve the problems that affect the normal operation of the sewage treatment system, low molecular weight, and slow dehydration speed that affect the quality of crude oil exported

Active Publication Date: 2021-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the extraction of crude oil, oil-water emulsions with different degrees of emulsification are often formed with the generation of water, which not only increases the load on storage, transportation and processing equipment, increases energy consumption, but also forms high viscosity in the settling tank of the demulsification dehydration system. aging oil
The demulsification and dehydration of these oil-water emulsions and aged crude oil are difficult, and it is difficult to complete the oil-water separation by simple gravity sedimentation. High water content, high oil content in the extracted sewage, and the formation of a thick emulsified transition layer in the sewage settling tank, etc., affect the quality of crude oil transportation and the normal operation of the sewage treatment system, and adversely affect oilfield production
At present, the commonly used demulsifiers are mainly polyether demulsifiers, which have low molecular weight, slow dehydration speed, incomplete oil-water separation, and poor adaptability to aging crude oil.

Method used

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  • A kind of demulsifier and its preparation method and application
  • A kind of demulsifier and its preparation method and application
  • A kind of demulsifier and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The preparation method of the demulsifier of the present embodiment may further comprise the steps:

[0042] 1) Put 350g of formaldehyde solution with a mass concentration of 37% in a three-necked flask, add dropwise a NaOH solution with a mass concentration of 10%, adjust the pH value to 8.5, heat up to 50°C and stir, and add ethylenediamine dropwise into the there-necked flask 60g (the molar ratio of formaldehyde and ethylenediamine is 4.3:1), after the dropwise addition, the temperature was raised to 80°C for 2 hours, and then the temperature was lowered to 60°C for vacuum drying to remove moisture and unreacted formaldehyde to obtain ethylenediamine aldehyde;

[0043] 2) Add 396g of phenol into the there-necked flask, add dropwise HCl solution with a mass concentration of 18%, adjust the pH value to 4, raise the temperature to 70°C, and add all the ethylenediamine aldehyde prepared in step 1) dropwise into the phenol (The molar ratio of phenol to ethylenediamine ald...

Embodiment 2

[0056] The preparation method of the demulsifier of the present embodiment may further comprise the steps:

[0057] 1) According to the step 1)~2) of embodiment 1, prepare ethylenediamine aldehyde phenol; Get 55g ethylenediamine aldehyde phenol and 172g tetraethylenepentamine and drop in the three-necked flask (the mole of ethylenediamine aldehyde phenol and tetraethylenepentamine ratio of 1:8), at 60°C, dropwise add 74g of formaldehyde solution with a mass concentration of 37% (the molar ratio of ethylenediamine aldehyde phenol to formaldehyde is 1:8), and slowly raise the temperature to 90°C for 1 hour, then raise the temperature to 120 ℃ for 2 hours, lower the temperature, and vacuum-dry the product to obtain a brown-yellow viscous ethylenediamine-modified phenolamine resin;

[0058] 2) Take ethylenediamine-modified phenolamine resin 6g as the initiator and catalyst KOH 3g and add it to the autoclave, seal the autoclave and test the pressure, and use dry nitrogen to displac...

Embodiment 3

[0068] The preparation method of the demulsifier of the present embodiment may further comprise the steps:

[0069] 1) Prepare ethylenediamine-modified phenolamine resin diblock polyether according to steps 1) to 4 of Example 1;

[0070] 2) Take 80g of ethylenediamine-modified phenolic amine resin diblock polyether, 9g of zinc acetate, 240g of acrylic acid, 160g of maleic anhydride, and 40g of toluene, and add them to the four ports of the reflux condenser, stirrer, and thermometer with a water separator. In the flask, after replacing the air with nitrogen, heat and stir, and reflux at 120°C for 6 hours;

[0071] Then cool down to 60°C, add 4g of dioctyl peroxydicarbonate (EHP), raise the temperature to 70°C, continue the reaction for 1.5h, then cool down to 30°C, and discharge to obtain acrylic acid maleic anhydride modified high-efficiency demulsifier.

[0072] Examples of demulsifiers

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Abstract

The invention relates to a demulsifier, a preparation method and application thereof, and belongs to the technical field of petroleum processing. The preparation method of the demulsifier of the present invention comprises the following steps: 1) performing an esterification reaction on the compound shown in formula I and compound A under the action of an esterification catalyst to obtain an esterified product; the compound A is an unsaturated carboxylic acid and / or unsaturated acid anhydride; 2) the esterification product is used as a polymerization monomer to carry out a carbon-carbon double bond polymerization reaction; the temperature of the polymerization reaction is 70-90°C, and the time is 0.5-1.5h. The preparation method of the demulsifier of the present invention improves the molecular weight of the product, and the prepared demulsifier has strong surface activity and good lipophilic and hydrophilic properties, and is suitable for oil-water emulsion and aged crude oil at the same time, and is a kind of demulsification efficiency High-efficiency dehydration demulsifier for oil fields with the characteristics of high cost, low cost, small dosage, and small side effects.

Description

technical field [0001] The invention relates to a demulsifier, a preparation method and application thereof, and belongs to the technical field of petroleum processing. Background technique [0002] During the extraction of crude oil, oil-water emulsions with different degrees of emulsification are often formed with the generation of water, which not only increases the load on storage, transportation and processing equipment, increases energy consumption, but also forms high viscosity in the settling tank of the demulsification dehydration system. aging oil. Demulsification and dehydration of these oil-water emulsions and aged crude oil are difficult, and it is difficult to complete oil-water separation by simple gravity sedimentation. High water content, high oil content in the extracted sewage, and the formation of a thick emulsified transition layer in the sewage settling tank, etc., affect the quality of crude oil transportation and the normal operation of the sewage tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G33/04C08F283/06C08F220/06
Inventor 常大明禹越海王小勇杨彬张忠陈荣凤刘永存
Owner CHINA PETROLEUM & CHEM CORP
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