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Preparation method of polyether-grafted chitosan derivative crude oil desalting demulsifier

A technology of chitosan derivatives and demulsifiers, which is applied in the direction of dehydration/demulsification by chemical methods, can solve the problems of metal cation removal and weak binding ability, and achieve the effect of wide sources and good use safety

Active Publication Date: 2017-01-04
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 of polyether-grafted chitosan derivative crude oil desalting demulsifier
  • Preparation method of polyether-grafted chitosan derivative crude oil desalting demulsifier
  • Preparation method of polyether-grafted chitosan derivative crude oil desalting demulsifier

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Effect test

Embodiment 1

[0044] A kind of preparation of polyether grafted chitosan derivative crude oil desalination demulsifier, concrete steps are as follows:

[0045] (1) Formylation modification of polyethylene glycol monomethyl ether terminal hydroxyl group: take 1.75g ​​(5mmol) polyethylene glycol monomethyl ether (Mn=350) and dissolve it in 30mL of anhydrous dimethyl sulfoxide and 2mL of chloroform In the mixed solution, keep the reaction under nitrogen atmosphere, add 5.1mL (50mmol) acetic anhydride solution under constant stirring at room temperature, heat to 15°C, and react at constant temperature for 5h. After the reaction was completed, the reaction liquid was added to 400 mL of anhydrous ether, and the obtained precipitate was dissolved in chloroform and then recrystallized with ether solution (repeat this step once), and then vacuum-dried at room temperature for 24 hours to obtain the hydroformylated polyethylene glycol monomethyl ether .

[0046] (2) Preparation of glycidyl dimethyl d...

Embodiment 2

[0051] A kind of preparation of polyether grafted chitosan derivative crude oil desalination demulsifier, concrete steps are as follows:

[0052] (1) Formylation modification of polyethylene glycol monomethyl ether terminal hydroxyl group: take polyethylene glycol monomethyl ether (Mn=750) 3.75g (5mmol) and dissolve in 30mL of anhydrous dimethyl sulfoxide and 2mL of chloroform In the mixed solution, keep the reaction under nitrogen atmosphere, add 5.1mL (50mmol) acetic anhydride solution under constant stirring at room temperature, heat to 20°C, and react at constant temperature for 7h. After the reaction was completed, the reaction liquid was added to 400 mL of anhydrous ether, and the obtained precipitate was dissolved in chloroform and then recrystallized with ether solution (repeat this step once), and then vacuum-dried at room temperature for 24 hours to obtain the hydroformylated polyethylene glycol monomethyl ether .

[0053] (2) Preparation of glycidyl dimethyltetrade...

Embodiment 3

[0058] A kind of preparation of polyether grafted chitosan derivative crude oil desalination demulsifier, concrete steps are as follows:

[0059] (1) Formylation modification of polyethylene glycol monomethyl ether terminal hydroxyl group: take polyethylene glycol monomethyl ether (Mn=1000) 5g (5mmol) and dissolve in 30mL of anhydrous dimethyl sulfoxide and 2mL of chloroform In the solution, keep the reaction under nitrogen atmosphere, add 5.1mL (50mmol) acetic anhydride solution under constant stirring at room temperature, raise the temperature to 30°C, and keep the reaction time at constant temperature for 9h. After the reaction was completed, the reaction liquid was added to 400 mL of anhydrous ether, and the obtained precipitate was dissolved in chloroform and then recrystallized with ether solution (repeat this step once), and then vacuum-dried at room temperature for 24 hours to obtain the hydroformylated polyethylene glycol monomethyl ether .

[0060] (2) Preparation o...

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Abstract

The invention relates to a preparation method of a polyether-grafted chitosan derivative crude oil desalting demulsifier. The preparation method comprises the following specific steps: firstly, performing formylation modification on polyethylene glycol monoethylether; secondly, preparing glycidyl dimethyl alkyl ammonium chloride; thirdly, preparing quaternarization carboxyalkyl chitosan; fourthly, enabling formylation modified polyethylene glycol monoethylether to react with carboxy alkyl chitosan to obtain the polyether-grafted chitosan derivative crude oil desalting demulsifier. The polyether-grafted chitosan derivative crude oil desalting demulsifier disclosed by the invention is prepared by taking chitosannatural polymeric compounds as raw materials, and has the advantages of wide sources, naturalness, no toxicity, sustainability, good biocompatibility of a product, degradability and the like. The prepared demulsifier is good in demulsifying and dehydrating effect; meanwhile, a demulsifying molecule contains a large amount of carboxyalkyl groups and quaternary ammonium salt groups which have strong combining capacity to metal cation, ions with negative electricity such as naphthenic acid radicals as well as particles of which the surfaces are electronegative, so the polyether-grafted chitosan derivative crude oil desalting demulsifier has capacity of removing oil-soluble salts while demulsifying.

Description

technical field [0001] The invention relates to a preparation method of a polyether grafted chitosan derivative 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 coalesce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08B37/08C08G65/48C10G33/04
CPCC08B37/003C08G65/48C08G81/00C10G33/04
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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