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A kind of preparation method of double ionic crude oil desalting demulsifier

A dual-ion and demulsifier technology, 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 high molecular weight, good use safety, and good dehydration and desalination effects.

Active Publication Date: 2019-05-03
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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  • A kind of preparation method of double ionic crude oil desalting demulsifier
  • A kind of preparation method of double ionic crude oil desalting demulsifier
  • A kind of preparation method of double ionic crude oil desalting demulsifier

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Effect test

Embodiment 1

[0042] A kind of preparation of double ion type crude oil desalting demulsifier comprises the steps:

[0043] (1) Esterification modification of polyethylene glycol monomethyl ether terminal hydroxyl group: take polyethylene glycol monomethyl ether (Mn=350) 1.75g ​​(5mmol) and dissolve it in 50mL of anhydrous pyridine, under constant stirring at room temperature Add 0.25g (2.5mmol) of succinic anhydride, heat up to 50°C and reflux for 5 hours, cool the reaction solution to room temperature, distill under reduced pressure, dissolve the distilled solid with 30mL of dichloromethane, wash with water 3 times, add anhydrous sodium sulfate, Filter and take the filtrate to obtain carboxylated polyethylene glycol monomethyl ether solution. 1 mL of pyridine was added to the carboxylated polyethylene glycol monomethyl ether solution, 1.19 g (10 mmol) of thionyl chloride was slowly added dropwise to the reaction solution, and the reaction was stirred at room temperature for 20 h. Distill...

Embodiment 2

[0049] A kind of preparation of double ion type crude oil desalting demulsifier comprises the steps:

[0050] (1) Esterification 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 30 mL of tetrahydrofuran, and add 1 g of it under constant stirring at room temperature (10mmol) succinic anhydride, warming up to 25°C for 48h. Distill under reduced pressure, dissolve the distilled solid with 30 mL of dichloromethane, wash with water three times, add anhydrous sodium sulfate, filter, and take the filtrate to obtain carboxylated polyethylene glycol monomethyl ether solution. 1 mL of pyridine was added to the carboxylated polyethylene glycol monomethyl ether solution, and 1.7 g (15 mmol) of thionyl chloride was slowly added dropwise to the reaction liquid, and reacted at room temperature for 24 h. Distill under reduced pressure, add 3.2mL (80mmol) methanol to react...

Embodiment 3

[0056] A kind of preparation of double ion type crude oil desalting demulsifier comprises the steps:

[0057] (1) Esterification modification of polyethylene glycol monomethyl ether terminal hydroxyl group: take polyethylene glycol monomethyl ether (Mn=1900) 9.5g (5mmol) and dissolve it in 20mL anhydrous toluene, under the condition of constant stirring at room temperature Add 0.65g (6.6mmol) maleic anhydride, heat up to 70°C and reflux for 48h. After the reaction solution was cooled, it was distilled under reduced pressure, and the distilled solid was dissolved with 30 mL of dichloromethane, washed three times with water, added with anhydrous sodium sulfate, filtered, and the filtrate was taken to obtain a carboxylated polyethylene glycol monomethyl ether solution. 1 mL of pyridine was added to the carboxylated polyethylene glycol monomethyl ether solution, and 2.38 g (20 mmol) of thionyl chloride was slowly added dropwise to the reaction solution, and reacted at room tempera...

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Abstract

The invention relates to a preparation method of a double-ion type crude oil desalting demulsifier. The preparation method specifically comprises the following steps: (1) carrying out esterification modification on polyethylene glycol monomethyl ether; (2) preparing glycidyl dimethyl alkyl ammonium chloride; (3) preparing quaternary ammonium carboxymethyl chitosan; (4) making the modified polyethylene glycol monomethyl ether react with the quaternary ammonium carboxymethyl chitosan to obtain a polyethylene glycol monomethyl ether grafted quaternary ammonium carboxymethyl chitosan. The double-ion type crude oil desalting demulsifier takes natural macromolecular compounds of chitosan as raw materials, thereby having many advantages of wide sources, naturalness, no toxicity, sustainability, good product bio-compatibility and degradation and the like. The prepared demulsifier is good in demulsification and dehydration effects, furthermore, demulsifier molecules contain a large number of carboxyl alkyl groups and quaternary ammonium salt groups, so that the demulsifier has a very strong binding capacity for negatively charged ions such as metal cations, naphthenic acid radicals and particles of which the surfaces are electronegative, thereby further having the removal ability for oil soluble salts while performing demulsification.

Description

technical field [0001] The invention relates to a preparation method of a double-ion type 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 dropl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/00C08G65/337C08G65/331C08B37/08C10G33/04
CPCC08B37/003C08G65/3312C08G65/337C08G81/00C10G33/04
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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