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Demulsifying agent as well as preparation method and application thereof

A demulsifier, unsaturated technology, applied in the field of demulsifier and its preparation, can solve the problems of large amount of demulsifier, strong specificity, easy to be affected by electrolyte, etc., and achieve the effect of improving the demulsification effect

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first generation of demulsifiers appeared in the 1920s and 1930s, mainly low molecular weight anionic surfactants, including carboxylate, sulfate and sulfonate types. The advantages of this type of demulsifier It is cheap, but its disadvantages are large dosage (1000mg / L), low efficiency, and easy to be affected by electrolytes; in the 1940s and 1950s, the second generation of demulsifiers was developed, mainly low-molecular non-ionic surfactants, such as OP type , Tween-type surfactants. Although this type of demulsifier can resist acid, alkali and salt, the amount of demulsifier is still relatively large (300-500mg / L), and the demulsification effect is not ideal; it has been developed since the 1960s. The third-generation demulsifiers are mainly high-molecular non-ionic surfactants, such as block copolymers of polyoxyethylene and polyoxypropylene, which have the advantage of less dosage (5-100mg / L), and the disadvantage of strong specificity
[0006] The copolymer of 2-Acrylamide-2-methylpropanesulfonic acid (AMPS for short) and some other monomers is a good fluid loss control agent for drilling fluids. There are reports of introducing unsaturated acid into polyether, then copolymerizing it with 2-acrylamide-2-methylpropanesulfonic acid, and using the resulting copolymer as a demulsifier

Method used

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  • Demulsifying agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The synthesis of demulsifier C follows the steps below:

[0041] (1) Add 15g of nonylphenolic resin (relative molecular mass: 1090) and 0.9g of KOH to the autoclave, add dropwise 36.2g of propylene oxide, control the reaction temperature at 130°C, and add 65.8 g ethylene oxide, control temperature 125±5℃, pressure 2.3kg / cm 2 , when the reaction of ethylene oxide is complete, add 72.5g propylene oxide at this temperature, continue the reaction for 0.5h, and wait until the pressure drop of the kettle is 0kg / m 2 , cooling and discharging to obtain block polyether A.

[0042] (2) Take 80g of the above-mentioned block polyether A, add 1.2g of p-toluenesulfonic acid and 0.7g of hydroquinone, stir and raise the temperature. After completion, continue to keep warm at 105-110°C for 1.5h, distill under reduced pressure, remove methanol, and obtain polyether esterification product B.

[0043] (3) In a three-necked flask, add 27g of the above-mentioned polyether esterification p...

Embodiment 2

[0045] The synthesis of demulsifier D follows the following steps:

[0046] Steps (1) and (2) are the same as in Example 1.

[0047] (3) In a three-necked flask, add 27g of the above-mentioned polyether esterification product B, add 0.169g of acrylic acid, 0.469g of AMPS, and 19g of deionized water, and stir to raise the temperature. Dissolve 4.145g of the initiator ammonium persulfate in 13g of deionized water, place it in the dropping funnel, and wait until the temperature of the kettle liquid rises to 85°C, start adding the initiator dropwise, and finish dropping for 0.5h, and continue the reaction for 1.5h after the addition is completed. Cooling and discharging to obtain product D.

Embodiment 3

[0049] The synthesis of demulsifier E follows the following steps:

[0050] Steps (1) and (2) are the same as in Example 1.

[0051] (3) In a three-necked flask, add 27 g of the above-mentioned polyether esterification product B, add 0.169 g of acrylic acid, 0.59 g of AMPS, and 19 g of deionized water, and stir to raise the temperature. Dissolve 2.76g of the initiator ammonium persulfate in 13g of deionized water, put it in the dropping funnel, wait until the temperature of the kettle liquid rises to 85°C, start to add the initiator dropwise, and finish dropping for 0.5h, and continue the reaction for 1.5h after the addition is completed. Cooling and discharging to obtain product E.

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Abstract

The invention relates to a demulsifying agent as well as a preparation method and an application of the demulsifying agent. The preparation method comprises the steps: (1) in the presence of an interesterification catalyst and a polymerization inhibitor, carrying out interesterification on a polyether raw material and methyl ester of unsaturated carboxylic acid and / or ethyl ester of unsaturated carboxylic acid; (2) separating methanol and / or ethanol by virtue of reduced pressure distillation; and (3) mixing with the unsaturated carboxylic acid, 2-acrylamide-2-sodium methallyl sulfonate, water and a free radical polymerization initiating agent to perform free radical polymerization. The demulsifying agent prepared by using the method is particularly suitable for demulsification and dehydration of high asphaltene thickened oil.

Description

technical field [0001] The invention relates to a demulsifier and its preparation method and application. Background technique [0002] After more than 150 years of exploitation, conventional crude oil reserves around the world show an obvious decreasing trend, the quality of recoverable crude oil is gradually deteriorating, the inferior and heavy quality of crude oil are becoming more and more obvious, and the proportion of heavy and inferior crude oil is increasing year by year. As one of the countries with higher heavy oil production in the world, my country has more abundant heavy oil resources than conventional crude oil resources. [0003] In my country, heavy oil refers to crude oil with a viscosity greater than 50mPa.s at the reservoir temperature. According to the viscosity, heavy oil can be further divided into ordinary heavy oil (50-10000mPa.s), extra heavy oil (10000-50000mPa.s), super heavy oil (10000-50000mPa.s), super heavy oil Heavy oil (above 50000mPa.s). I...

Claims

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Application Information

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IPC IPC(8): C08F290/06C10G33/04
Inventor 李本高李璐侯钰王振宇
Owner CHINA PETROLEUM & CHEM CORP
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