Preparation method of chitosan type crude oil desalting demulsifier

A demulsifier and saccharide technology, applied in the field of preparation of chitosan crude oil desalination demulsifier, can solve the problems of metal cation removal and weak binding ability, and achieve high molecular weight, good use safety, and increased demulsification. effect of difficulty

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 cert

Method used

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  • Preparation method of chitosan type crude oil desalting demulsifier
  • Preparation method of chitosan type crude oil desalting demulsifier
  • Preparation method of chitosan type crude oil desalting demulsifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A kind of preparation of chitosan crude oil desalting demulsifier comprises the steps:

[0043] (1) Epoxidation modification of polyethylene glycol monomethyl ether terminal hydroxyl group: get polyethylene glycol monomethyl ether (Mn=350) 1.75g ​​(5mmol) and dissolve in 50mL anhydrous toluene, add 50mL tetrahydrofuran and 0.18g (7.5mmol) of sodium hydride reagent was heated up to 25°C and reacted for 2h. 1.6mL (20mmol) of epichlorohydrin was slowly added dropwise to the reaction solution at a temperature of 40°C and reacted for 6h. The reaction solution was added to 200 mL of diethyl ether, filtered with suction, washed several times with diethyl ether, dried in vacuo, dissolved in 200 mL of dichloromethane, washed with distilled water three times, separated, dried with anhydrous magnesium sulfate, and the filtrate Pressure distillation, freeze-drying to obtain epoxidized polyethylene glycol monomethyl ether.

[0044] (2) Preparation of glycidyl dimethyl dodecyl ammo...

Embodiment 2

[0049] A kind of preparation of chitosan crude oil desalting demulsifier comprises the steps:

[0050] (1) Epoxidation modification of polyethylene glycol monomethyl ether terminal hydroxyl group: get polyethylene glycol monomethyl ether (Mn=750) 3.75g (5mmol) and dissolve in 50mL anhydrous toluene, add 50mL tetrahydrofuran and 0.24g (10mmol) of sodium hydride reagent was heated up to 20°C and reacted for 4h. 2.4mL (30mmol) of epichlorohydrin was slowly added dropwise to the reaction solution at a temperature of 35°C and reacted for 10h. The reaction solution was added to 200 mL of diethyl ether, filtered with suction, washed several times with diethyl ether, dried in vacuo, dissolved in 200 mL of dichloromethane, washed with distilled water three times, separated, dried with anhydrous magnesium sulfate, and the filtrate Pressure distillation, freeze-drying to obtain epoxidized polyethylene glycol monomethyl ether.

[0051] (2) Preparation of glycidyl dimethyltetradecyl ammo...

Embodiment 3

[0056] A kind of preparation of chitosan crude oil desalting demulsifier comprises the steps:

[0057] (1) Epoxidation modification of polyethylene glycol monomethyl ether terminal hydroxyl group: take polyethylene glycol monomethyl ether (Mn=1000) 5g (5mmol) and dissolve in 50mL anhydrous toluene, add 50mL tetrahydrofuran and 0.36 g (15mmol) of sodium hydride reagent, heated to 30°C, and reacted for 2h. 3.2mL (40mmol) of epichlorohydrin was slowly added dropwise to the reaction solution at a temperature of 30°C and reacted for 16h. The reaction solution was added to 200 mL of diethyl ether, filtered with suction, washed several times with diethyl ether, dried in vacuo, dissolved in 200 mL of dichloromethane, washed with distilled water three times, separated, dried with anhydrous magnesium sulfate, and the filtrate Pressure distillation, freeze-drying to obtain epoxidized polyethylene glycol monomethyl ether.

[0058] (2) Preparation of glycidyl dimethyl cetyl ammonium chlo...

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Abstract

The invention relates to a preparation method of a chitosan type crude oil desalting demulsifier. The preparation method includes the steps of firstly, performing epoxidation modification on methoxy polyethylene glycol; secondly, preparing glycidyl dimethyl alkyl ammonium chloride; thirdly, preparing quaternization carboxy alkyl chitosan; fourthly, allowing the modified methoxy polyethylene glycol to react with the quaternization carboxyl alkyl chitosan to obtain methoxy polyethylene glycol grafted quaternization carboxy alkyl chitosan. The preparation method has the advantages that chitosan type natural high-molecular compounds are used as the raw materials, the method is wide is source, natural, nontoxic and sustainable, and the product of the method is good in biocompatibility, degradable, and the like; the prepared demulsifier is good in demulsifying and dewatering effect, the demulsifier has high combining capacity to electronegative ions such as metal cations and naphthene acid radicals and electronegative particles due to the fact that the molecules of the demulsifier contain a large amount of carboxyl alkyl groups and quaternary ammonium salt groups, and oil-soluble salt can also be removed during demulsifying.

Description

technical field [0001] The invention relates to a preparation method of a chitosan 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 of emulsion droplets and ...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08G65/331C08B37/08C10G33/04
CPCC08B37/003C08G65/3318C08G81/00C10G33/04C10G2300/202
Inventor 吕仁亮梁成范光坦徐彩丽王存文高肖徐汶王为国
Owner WUHAN INSTITUTE OF TECHNOLOGY
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