Preparation method of efficient crude oil desalting demulsifier

A demulsifier and crude oil technology, applied in the field of preparation of crude oil desalination demulsifier, can solve the problems of metal cation removal, weak binding ability, etc., and achieve the effects of high molecular weight, good use safety and wide source.

Active Publication Date: 2016-12-14
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 efficient crude oil desalting demulsifier
  • Preparation method of efficient crude oil desalting demulsifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of preparation of efficient crude oil desalting demulsifier, its synthesis comprises the steps:

[0044] (1) Isocyanate modification of polyethylene glycol monomethyl ether terminal hydroxyl group: Add 1.75 g (5 mmol) of polyethylene glycol monomethyl ether (Mn=350) into 50 mL N,N dimethylformamide, heat to 55°C, magnetic stirring to fully dissolve the solution, cool the solution to 30°C, and then dissolve 0.125g (5mmol) diphenylmethane diisocyanate in 10mL N,N dimethylformamide, and add dropwise through the dropping funnel To the polyethylene glycol monomethyl ether N,N dimethylformamide solution, the dropping process is controlled within 30 minutes. After the dropwise addition, the temperature was raised to 60° C., and the reaction was performed at a constant temperature for 2 hours. After the reaction was completed, it was distilled under reduced pressure, dialyzed for 3 days, and freeze-dried to obtain isocyanated polyethylene glycol monomethyl ether.

[00...

Embodiment 2

[0050] A kind of preparation of efficient crude oil desalting demulsifier, its synthesis comprises the steps:

[0051] (1) Isocyanate modification of terminal hydroxyl groups of polyethylene glycol monomethyl ether: Add 3.75 g (5 mmol) of polyethylene glycol monomethyl ether (Mn=750) into 50 mL of N,N dimethylacetamide, heat to 60°C, magnetic stirring to fully dissolve the solution, cool the solution to 35°C, then dissolve 0.174g (10mmol) toluene diisocyanate in 10mL of N,N dimethylacetamide, and add dropwise to polyethylene diisocyanate through the dropping funnel Alcohol monomethyl ether N,N dimethylacetamide solution, the dropping process is controlled within 30min. After the dropwise addition, the temperature was raised to 50° C., and the reaction was performed at a constant temperature for 6 hours. After the reaction was completed, it was distilled under reduced pressure, dialyzed for 4 days, and freeze-dried to obtain isocyanated polyethylene glycol monomethyl ether.

...

Embodiment 3

[0057] A kind of preparation of efficient crude oil desalting demulsifier, its synthesis comprises the steps:

[0058] (1) Isocyanate modification of terminal hydroxyl groups of polyethylene glycol monomethyl ether: Add 5 g (5 mmol) of polyethylene glycol monomethyl ether (Mn=1000) into 50 mL of acetone, heat to 60 ° C, and magnetically stir to make it Fully dissolve, cool the solution to 40°C, then dissolve 0.223g (10mmol) isophorone diisocyanate in 10mL of acetone, and add it dropwise to the polyethylene glycol monomethyl ether acetone solution through the dropping funnel, dropwise The process is controlled at 30min. The temperature was raised to 55°C, and the reaction was carried out at constant temperature for 4h. After the reaction was completed, it was distilled under reduced pressure, dialyzed for 3 days, and freeze-dried to obtain isocyanated polyethylene glycol monomethyl ether.

[0059] (2) Preparation of glycidyl dimethyl cetyl ammonium chloride: add 2.69g cetyl d...

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Abstract

The invention relates to a preparation method of an efficient crude oil desalting demulsifier. The preparation method comprises the following specific steps: (1) performing isocyanic acid esterification modification on methoxy polyethylene glycol; (2) preparing glycidyl dimethyl alkylammonium chloride; (3) preparing quaternized carboxyalkyl chitosan; (4) modifying the methoxy polyethylene glycol and the quaternized carboxyalkyl chitosan for reaction to obtain a target product, namely, methoxy polyethylene glycol-grafted quaternized carboxyalkyl chitosan. By taking chitosan type natural macromolecular compounds as raw materials, the efficient crude oil desalting demulsifier has many advantages of wide availability, nature, nontoxicity, sustainability, high biocompatibility, degradability and the like. The prepared demulsifier is good in demulsifying and dehydration effect; meanwhile, molecules of the demulsifier contain a large quantity of carboxy alkyl groups and quaternary ammonium salt groups, so that the demulsifier is extremely high in combination capacity for negatively charged ions such as metal cations and naphthenic acid radicals, and particles with electronegativity on the surfaces, and can remove oil-soluble salt during dehumidification.

Description

technical field [0001] The invention relates to a preparation method of an efficient 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 a...

Claims

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Application Information

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IPC IPC(8): C10G33/04C10G29/20
CPCC10G29/20C10G33/04C10G2300/202C10G2300/205
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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