Preparation method of polyelectrolyte-type crude oil-desalting demulsifier

A technology of polyelectrolyte and demulsifier, which is used in chemical dehydration/demulsification, petroleum industry, treatment of hydrocarbon oil, etc., can solve the problems of weak binding ability and release of metal cations, etc., and achieves good safety in use and a wide range of sources. , good dehydration and desalination effect

Active Publication Date: 2016-12-14
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 polyelectrolyte-type crude oil-desalting demulsifier
  • Preparation method of polyelectrolyte-type crude oil-desalting demulsifier
  • Preparation method of polyelectrolyte-type crude oil-desalting demulsifier

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A kind of preparation of polyelectrolyte type crude oil desalting demulsifier, comprises the steps:

[0047] (1) Amination modification of terminal hydroxyl groups of polyethylene glycol monomethyl ether: Take 1.75 g (5 mmol) of polyethylene glycol monomethyl ether (Mn=350) and dissolve it in 10 mL of dichloromethane, and keep the reaction in an argon atmosphere 0.69mL (5mmol) of triethylamine was added, 2.38g (12.5mmol) of p-toluenesulfonyl chloride dissolved in dichloromethane was slowly added dropwise to the reaction solution, and the reaction was carried out in an ice-water bath (0°C) for 3h. Distill under reduced pressure, add 100 mL of diethyl ether for recrystallization, add the recrystallized product into 3.85 mL (0.1 mol) of ammonia water, and heat to 140° C. for reflux reaction for 6 h. Distilled under reduced pressure and freeze-dried to obtain aminopolyethylene glycol monomethyl ether;

[0048] (2) Preparation of glycidyl dimethyl dodecyl ammonium chloride:...

Embodiment 2

[0053] A kind of preparation of polyelectrolyte type crude oil desalting demulsifier, comprises the steps:

[0054] (1) Amination 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 10 mL of dichloromethane, and keep the reaction in an argon atmosphere 1.38mL (10mmol) of triethylamine was added, 4.76g (25mmol) of p-toluenesulfonyl chloride dissolved in dichloromethane was slowly added dropwise to the reaction solution, and the reaction was carried out in an ice-water bath (0°C) for 4h. Distill under reduced pressure, add 100 mL of diethyl ether for recrystallization, add the recrystallized product into 3.85 mL (0.1 mol) of ammonia water, heat to 140° C. and reflux for 7 h. Distilled under reduced pressure and freeze-dried to obtain aminopolyethylene glycol monomethyl ether;

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

Embodiment 3

[0060] A kind of preparation of polyelectrolyte type crude oil desalting demulsifier, comprises the steps:

[0061] (1) Amination 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 10 mL of dichloromethane, and keep the reaction in an argon atmosphere , 1.38mL (10mmol) of triethylamine was added, 4.76g (25mmol) of p-toluenesulfonyl chloride dissolved in dichloromethane was slowly added dropwise to the reaction solution, and the reaction was carried out in an ice-water bath (0°C) for 5h. Distill under reduced pressure, add 100 mL of diethyl ether for recrystallization, add the recrystallized product into 3.85 mL (0.1 mol) of ammonia water, heat to 140° C. for reflux reaction for 8 h. Distilled under reduced pressure and freeze-dried to obtain aminopolyethylene glycol monomethyl ether;

[0062](2) Preparation of glycidyl dimethyl cetyl ammonium chloride: add 2.6...

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Abstract

The invention relates to a preparation method of a polyelectrolyte-type crude oil-desalting demulsifier. The preparation method comprises the following specific steps: (1) performing amination modification on methoxypolyethylene glycol; (2) preparing glycidyl dimethyl alkyl ammonium chloride; (3) preparing quaternized carboxyalkyl chitosan; (4) carrying out a reaction between the modified methoxypolyethylene glycol and the quaternized carboxyalkyl chitosan to obtain a target product methoxypolyethylene glycol-grafted quaternized carboxyalkyl chitosan. The polyelectrolyte-type crude oil-desalting demulsifier takes a natural macromolecule chitosan compound as a raw material, and has the advantages of wide sources, naturalness, non-toxicity, sustainability, good product biocompatibility, biodegradability and the like. The prepared demulsifier has good demulsifying and dehydrating effects; a demulsifier molecule contains a large number of carboxyalkyl groups and quaternary ammonium groups, which have very strong capacity of bonding metal cations, negatively-charged ions such as naphthenic acid radicals, and particles with negative charges on the surfaces, so that besides the demulsifying capability, the demulsifier also has the capability of removing oil-soluble salts.

Description

technical field [0001] The invention relates to a preparation method of a polyelectrolyte type crude oil desalting 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 of emulsion drop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04C10G29/20
CPCC10G29/20C10G33/04C10G2300/202
Inventor 吕仁亮高肖徐彩丽王存文范光坦梁成徐汶王为国
Owner WUHAN INSTITUTE OF TECHNOLOGY
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