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Synthesis method of crude oil desalting demulsifying agent

A synthesis method and demulsifier technology, which is applied in the field of synthesis of crude oil desalination demulsifiers, can solve the problems of metal cation removal and weak binding ability, and achieve the effects of high molecular weight, good use safety and wide sources

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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  • Synthesis method of crude oil desalting demulsifying agent
  • Synthesis method of crude oil desalting demulsifying agent
  • Synthesis method of crude oil desalting demulsifying agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of synthetic of crude oil desalting demulsifier, comprises the steps:

[0042] (1) P-nitrophenyl esterification modification of polyethylene glycol monomethyl ether terminal hydroxyl group: Take polyethylene glycol monomethyl ether (Mn=350) 1.75g ​​(5mmol) and dissolve in 30mL acetonitrile solution, stir at room temperature 1.39mL (10mmol) triethylamine was added, 2.02mL (10mmol) p-nitrophenyl chloroformate was dissolved in 10mL acetonitrile solution and slowly added dropwise to the reaction solution at a temperature of 20°C for 20h. Filtrate, distill under reduced pressure, add a certain amount of ether to recrystallize three times, and dry in vacuum to obtain p-nitrophenyl esterified polyethylene glycol monomethyl ether.

[0043] (2) Preparation of glycidyl dimethyl dodecyl ammonium chloride: add 2.13g of dodecyl dimethyl tertiary amine to the three-necked flask equipped with agitator, dropping funnel and condensation reflux device, constantly stir , take 3.7g...

Embodiment 2

[0048] A kind of synthetic of crude oil desalting demulsifier, comprises the steps:

[0049] (1) P-nitrophenyl esterification modification of polyethylene glycol monomethyl ether terminal hydroxyl group: Take polyethylene glycol monomethyl ether (Mn=750) 3.75g (5mmol) and dissolve in 30mL acetonitrile solution, stir at room temperature 1.39mL (10mmol) triethylamine was added, 3.03mL (15mmol) p-nitrophenyl chloroformate was dissolved in 10mL acetonitrile solution and slowly added dropwise to the reaction solution at a temperature of 25°C for 24h. Filtrate, distill under reduced pressure, add a certain amount of ether to recrystallize three times, and dry in vacuum to obtain p-nitrophenyl esterified polyethylene glycol monomethyl ether.

[0050] (2) Preparation of glycidyl dimethyltetradecyl ammonium chloride: add 2.41g tetradecyl dimethyl tertiary ammonium to a three-necked flask equipped with a stirrer, dropping funnel and condensing reflux device, constantly stir , take 3.7g...

Embodiment 3

[0055] A kind of synthetic of crude oil desalting demulsifier, comprises the steps:

[0056] (1) P-nitrophenyl esterification modification of polyethylene glycol monomethyl ether terminal hydroxyl group: take polyethylene glycol monomethyl ether (Mn=1000) 5g (5mmol) and dissolve in 30mL acetonitrile solution, stir at room temperature, Add 2.08mL (15mmol) of triethylamine, dissolve 4.04g (20mmol) of p-nitrophenyl chloroformate in 10mL of acetonitrile solution and slowly add it dropwise to the reaction solution at a temperature of 25°C for 20h. Filtrate, distill under reduced pressure, add a certain amount of ether to recrystallize three times, and dry in vacuum to obtain p-nitrophenyl esterified polyethylene glycol monomethyl ether.

[0057] (2) Preparation of glycidyl dimethyl cetyl ammonium chloride: add 2.69g cetyl dimethyl tertiary amine to a three-necked flask equipped with a stirrer, dropping funnel and condensation reflux device, constantly stir , Take 3.7g of epichloro...

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Abstract

The invention relates to a synthesis method of a crude oil desalting demulsifying agent. The method specifically includes the steps of firstly, conducting p-nitrophenyl ester modification on methoxypolyethylene glycol; secondly, preparing glycidyl dimethyl alkyl ammonium chloride; thirdly, preparing quaternized carboxy alkyl chitosan; fourthly, making the modified methoxypolyethylene glycol react with quaternized carboxy alkyl chitosan to obtain a product, namely polyethylene glycol questin grafted quaternized carboxy alkyl chitosan. A chitosan type natural high-molecular compound serves as the raw material and has the advantages of being wide in resource, natural, free of toxin, sustainable, good in product biocompatibility, degradable and the like; The prepared demulsifying agent is good in demulsifying dewatering effect; meanwhile, due to the fact that lots of carboxy alkyl groups and quaternary ammonium salt groups are contained in demulsifying agent molecules and have strong binding capacity with metal cations, naphthenic acid radicals and other ions with negative charges and particles with surface electronegativity, the oil-soluble salt removing capacity is achieved during demulsifying.

Description

technical field [0001] The invention relates to a synthesis method of a crude oil desalting demulsifier, which belongs 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 droplets and makes the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G65/337C08B37/08C10G33/04
CPCC08B37/003C08G65/337C08G81/00C08G2650/04C08G2650/38C08G2650/50C10G33/04C10G2300/1033
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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