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Preparation method for chitosan natural polymer modified crude oil desalting demulsifier

A technology of natural polymer and demulsifier, applied in the direction of chemical dehydration/demulsification, etc., can solve the problems of weak binding ability and release of metal cations, achieving good safety in use, wide sources, and increasing the difficulty of demulsification Effect

Active Publication Date: 2016-12-07
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The demulsifier not only has a good effect of demulsification and dehydration, but also a large number of hydroxyl groups and other groups contained in the demulsifier molecule have a certain chelation ability for metal ions, but the binding ability is not strong, and it cannot remove different types and a large number of metal cations during dehydration. , need to improve

Method used

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  • Preparation method for chitosan natural polymer modified crude oil desalting demulsifier
  • Preparation method for chitosan natural polymer modified crude oil desalting demulsifier
  • Preparation method for chitosan natural polymer modified crude oil desalting demulsifier

Examples

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Effect test

Embodiment 1

[0046] A preparation of chitosan natural macromolecular modified crude oil desalination demulsifier, specifically comprising the following steps:

[0047] (1) Chlorination modification of terminal hydroxyl groups of polyethylene glycol monomethyl ether: Dissolve 1.75 g (5 mmol) of polyethylene glycol monomethyl ether (Mn=350) in 40 mL of 1,4-dioxane and freeze Stir in a water bath (0°C), add 0.79g (10mmol) of pyridine and 1.19g (10mmol) of thionyl chloride, and react under reflux at 70°C for 2h. The solvent was removed by distillation under reduced pressure, the residual solid was dissolved in dichloromethane, washed with water for 3 times, anhydrous sodium sulfate was added to remove water, and then filtered with suction, the filtrate was distilled under reduced pressure to obtain a solid, and freeze-dried to obtain chloropolyethylene glycol monomethyl ether ;

[0048] (2) Preparation of glycidyl dimethyl dodecyl ammonium chloride: add 2.13g of dodecyl dimethyl tertiary amin...

Embodiment 2

[0053] A preparation of chitosan natural macromolecular modified crude oil desalination demulsifier, specifically comprising the following steps:

[0054] (1) Bromination modification of terminal hydroxyl groups of polyethylene glycol monomethyl ether: Take 3.75 g (5 mmol) of polyethylene glycol monomethyl ether (Mn=750) and dissolve it in 40 mL of 1,4-dioxane, and freeze Stir in a water bath (2°C), add 1.18g (15mmol) of pyridine and 1.78g (15mmol) of thionyl bromide, and react under reflux at 70°C for 4h. The solvent was removed by distillation under reduced pressure, the residual solid was dissolved in dichloromethane, washed 3 times with water, anhydrous sodium sulfate was added to remove water, and then filtered with suction, the filtrate was evaporated under reduced pressure to obtain a solid, which was freeze-dried to obtain brominated polyethylene glycol mono methyl ether.

[0055] (2) Preparation of glycidyl dimethyltetradecyl ammonium chloride: add 2.41g tetradecyl d...

Embodiment 3

[0060] A preparation of chitosan natural macromolecular modified crude oil desalination demulsifier, specifically comprising the following steps:

[0061](1) Iodination modification of terminal hydroxyl groups of polyethylene glycol monomethyl ether: take 5 g (5 mmol) of polyethylene glycol monomethyl ether (Mn=1000) and dissolve it in 40 mL of toluene, and stir in an ice-water bath (5° C.) , Add 1.73g (7.5mmol) of silver oxide, 0.166g (1mmol) of potassium iodide and 1g (5mmol) of p-toluenesulfonyl chloride, and react at room temperature for 12h. The silver oxide was removed by filtration, the solvent was evaporated under reduced pressure, the remaining mixture was added into 30 mL of acetonitrile, the temperature was raised to 60° C., and stirring was continued for 2 h. The reaction solution was separated by column chromatography with the mobile phase of dichloromethane and methanol, and freeze-dried to obtain iodopolyethylene glycol monomethyl ether.

[0062] (2) Preparatio...

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Abstract

The invention relates to a preparation method for a chitosan natural polymer modified crude oil desalting demulsifier. The method comprises the following steps: 1) modifying polyethylene glycol monomethyl ether by halogenating; 2) preparing glycidyl dimethyl alkyl ammonium chloride; 3) preparing quaternized carboxy alkyl chitosan; 4) causing the modified polyethylene glycol monomethyl ether to react with the quaternized carboxy alkyl chitosan, thereby obtaining a target product, polyethylene glycol monomethyl ether grafted quaternized carboxy alkyl chitosan. According to the invention, the chitosan natural high-molecular compound is taken as the raw material and has the advantages of wide resource, naturality, non-toxicity, sustainability, excellent biological compatibility of products, degradability, and the like. The demulsifier prepared according to the invention has excellent demulsification dewatering effect; the molecule of the demulsifier contains a large amount of carboxy alkyl groups and quaternary ammonium salt groups and the electronegative ions, including metal cation, naphthene acid radicals, and surfaces are electronegative grains and have strong combining capacity, so that the demulsifier has the capacities of demulsifying while removing oil-soluble salt.

Description

technical field [0001] The invention relates to a preparation method of a chitosan natural polymer modified crude oil desalination demulsifier, belonging to the field of petrochemical industry. Background technique [0002] With the rapid development of industry, the demand for oil is increasing, and it is of great significance to enhance oil recovery. As the use of chemical flooding continues to increase, coupled with the increasingly heavy and high acid value of crude oil, the content of metal ions in crude oil is gradually increasing. The salts in crude oil are mainly inorganic salts, most of which are soluble in the water contained in them, and water and oil form a stable water-in-oil (W / O) emulsion. The key to desalting crude oil is dehydration, and the key to dehydration is demulsification. The natural emulsion in crude oil is adsorbed at the oil-water interface to form a viscoelastic film with a certain strength, which creates a dynamic obstacle for the coalescence ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G65/337C08G65/323C08G65/332C08B37/08C10G33/04
CPCC08B37/003C08G65/323C08G65/3322C08G65/337C08G81/00C08G2650/04C08G2650/48C10G33/04
Inventor 吕仁亮范光坦王存文徐彩丽高肖梁成姚震张俊峰
Owner WUHAN INSTITUTE OF TECHNOLOGY
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