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Natural polysaccharide macromolecule-modified crude oil demulsifier

A crude oil demulsifier and natural polymer technology, which is applied in the field of crude oil demulsifier modified by polysaccharide natural polymer, can solve the problems of being easily affected by electrolytes, poor adaptability and poor effect, and achieve good demulsification and dehydration effect. , the use of good safety, the effect of a wide range of sources

Inactive Publication Date: 2015-05-20
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the 1920s to the 1930s, in order to solve the demulsification of oil-in-water crude oil emulsions, the first generation of low-molecular-weight ionic demulsifiers appeared, such as fatty acid salts, naphthenates and other anionic demulsifiers and quaternary ammonium salts. Cationic demulsifier has the advantage of low price, but its disadvantages are large dosage, poor effect, and easy to be affected by electrolytes; from the 1940s to the 1950s, the industrialization of ethylene oxide production promoted the production of ethylene oxide and propylene oxide. The emergence of block copolymers has developed the second generation of demulsifiers for water-in-oil emulsified crude oil. This generation of demulsifiers is mainly low-molecular non-ionic surface active; Relative molecular weight polyether-based demulsifiers, foreign countries have conducted a lot of research on crude oil demulsifiers, and proposed a large number of patents
However, the disadvantages of these demulsifiers are strong specificity and poor adaptability

Method used

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  • Natural polysaccharide macromolecule-modified crude oil demulsifier
  • Natural polysaccharide macromolecule-modified crude oil demulsifier
  • Natural polysaccharide macromolecule-modified crude oil demulsifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of crude oil demulsifier modified by polysaccharide natural macromolecule, its synthesis comprises the steps:

[0044] (1) Chlorination reaction: Dissolve 5g of polyethylene glycol monomethyl ether in 40mL of carbon tetrachloride, add 0.39g of pyridine and 1.78g of thionyl chloride, heat and react at 70°C for 40h, and the reaction solution is decompressed Distill to remove the solvent, dissolve the distilled solid with dichloromethane, add a small amount of potassium carbonate to filter, pour the filtrate into ten times the volume of ice ether, filter the precipitated solid, freeze-dry to obtain chloropolyethylene glycol monomethyl ether;

[0045] (2) Preparation of glycidyl dimethyl dodecyl ammonium chloride: Add 1.38g of epichlorohydrin and 40mL of methyl tert-butyl ether into a three-necked flask equipped with a stirrer, dropping funnel and condensing reflux device , constantly stirring and adding 2.13g of dodecyl dimethyl tertiary amine dropwise with a droppi...

Embodiment 2

[0055] A kind of crude oil demulsifier modified by polysaccharide natural macromolecule, its synthesis comprises the steps:

[0056] (1) Carboxylation reaction: Add 5g of polyethylene glycol monomethyl ether into 40mL of chloroform, then add 0.49g of triethylamine and 0.5g of succinic anhydride, heat the mixture to 80°C under reflux to control the reaction for 40h, under reduced pressure The solvent is distilled off by distillation, the distillation residue is washed with dichloromethane, and then ether is added to precipitate the product to obtain carboxylated polyethylene glycol monomethyl ether;

[0057] (2) Preparation of glycidyl dimethyltetradecyl ammonium chloride: Add 1.38g of epichlorohydrin and 40mL of diethyl ether into a three-necked flask equipped with a stirrer, dropping funnel and condensing reflux device, stir continuously and drip Add 2.41 g of tetradecyldimethyl tertiary amine dropwise into the liquid funnel, control a certain rate of addition, keep the tempe...

Embodiment 3

[0062] A kind of crude oil demulsifier modified by polysaccharide natural macromolecule, its synthesis comprises the steps:

[0063] (1) Amination reaction: Put 5g of chlorinated polyethylene glycol monomethyl ether in a high-pressure reactor, dissolve 1g of ammonia water in 40ml of water, add it to the reactor, and heat it to 130°C under airtight conditions. Reaction 25h. The reaction solution was evaporated to dryness under reduced pressure, and the residue was dissolved in water and extracted with dichloromethane. After standing overnight, the organic layer was dried over anhydrous magnesium sulfate, filtered, the solvent was distilled off, and the residue was recrystallized from ethyl acetate to obtain white solid aminated polyethylene glycol methyl ether.

[0064] (2) Preparation of glycidyl dimethyl hexadecyl ammonium chloride: Add 13.8g of epichlorohydrin and 40mL of ethanol to a three-necked flask equipped with a stirrer, dropping funnel and condensing reflux device, ...

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Abstract

The invention relates to a crude oil demulsifier, and discloses a natural polysaccharide macromolecule-modified crude oil demulsifier. The demulsifier is prepared by adopting the following operation steps: (1) conducting halogenation modification, carboxylation modification, amination modification, formylation modification, or isocyanic acid esterification modification on polyethylene glycol monomethyl ether; (2) preparing glycidyl dimethyl alkyl ammonium chloride; (3) preparing quaternized polysaccharide; and (4) reacting the modified polyethylene glycol monomethyl ether with quaternized polysaccharide to obtain a product, namely the natural polysaccharide macromolecule-modified crude oil demulsifier. According to the crude oil demulsifier, as the raw material, the natural polysaccharide macromolecule compound has multiple advantages of being wide in source, natural, non-toxic, sustainable, good in usage safety and the like; and the prepared demulsifier has good demulsifying and dewatering effects; in addition, the molecules of the demulsifier contain a great deal of groups of hydroxyl and the like, which have certain chelating capability to metal ions, thus being capable of removing a certain amount of metal ions while demulsifying.

Description

technical field [0001] The invention relates to a crude oil demulsifier, in particular to a polysaccharide natural polymer modified crude oil demulsifier. Background technique [0002] Water always exists in crude oil from crude oil extraction to refining process, because crude oil and water are immiscible, but in the presence of natural emulsifiers in crude oil such as asphaltene, colloid, clay, etc., coupled with impact during mechanical transmission Under conditions, water and oil can form relatively stable emulsions. The existence of water brings certain hazards to the storage, transportation and processing of crude oil: (1) the existence of a large amount of water is not conducive to storage and transportation; (2) in the process of crude oil refining, a large number of inorganic salt ions in water, especially chlorine Ions cause corrosion to equipment, and some metal ions poison the catalyst in the downstream production process, leading to catalyst deactivation; (3) T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07H1/00
Inventor 王存文王磊吕仁亮王为国覃远航张俊峰
Owner WUHAN INSTITUTE OF TECHNOLOGY
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