Modified crude oil demulsifier and preparation method thereof

A demulsifier and modification technology, which is applied in dehydration/demulsification by chemical methods, petroleum industry, hydrocarbon oil treatment, etc. It can solve the problems of poor environmental friendliness and secondary pollution of demulsifiers, and achieve strong competitive adsorption capacity, oil-water Neat interface and effects from a wide range of sources

Active Publication Date: 2018-11-23
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These demulsifiers are poor in environmental friendliness and are likely to cause irreversible secondary pollution; in addition, there are more or less differences in the composition and properties of crude oil production fluids in each oilfield, and there is no demulsifier that can handle all types of crude oil production fluids. emulsion

Method used

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  • Modified crude oil demulsifier and preparation method thereof
  • Modified crude oil demulsifier and preparation method thereof
  • Modified crude oil demulsifier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The preparation of the butyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:

[0055] (1) Synthesis of epoxidized polyethylene glycol monomethyl ether: get polyethylene glycol monomethyl ether (M n =5000) 5g (1mmol) was dissolved in 50mL of anhydrous toluene, then 50mL of tetrahydrofuran and 0.036g (1.5mmol) of sodium hydride reagent were added, the temperature was raised to 25°C, and the reaction was carried out for 4h. Slowly add 0.37mL (4mmol) epichlorohydrin dropwise into the reaction solution at a temperature of 40°C and react 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 was filtered with suction Distilled under reduced pressure and freeze-dried to obtain epoxi...

Embodiment 2

[0060] The preparation of the hexyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:

[0061] (1) Synthesis of epoxidized polyethylene glycol monomethyl ether: get polyethylene glycol monomethyl ether (M n =1900) 1.9g (1mmol) was dissolved in 50mL of anhydrous toluene, then 50mL of tetrahydrofuran and 0.036g (1.5mmol) of sodium hydride reagent were added, the temperature was raised to 25°C, and the reaction was carried out for 4h. Slowly add 0.37mL (4mmol) epichlorohydrin dropwise into the reaction solution at a temperature of 40°C and react 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 was filtered with suction Distilled under reduced pressure and freeze-dried to obtain epo...

Embodiment 3

[0066] The preparation of the octyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:

[0067] (1) Synthesis of epoxidized polyethylene glycol monomethyl ether: get polyethylene glycol monomethyl ether (M n =750) 0.75 g (1 mmol) was dissolved in 50 mL of anhydrous toluene, then 50 mL of tetrahydrofuran and 0.036 g (1.5 mmol) of sodium hydride reagent were added, the temperature was raised to 25° C., and the reaction was carried out for 4 h. Slowly add 0.37mL (4mmol) epichlorohydrin dropwise into the reaction solution at a temperature of 40°C and react 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 filtered with suction Distilled under reduced pressure and freeze-dried to obtain epoxidized ...

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Abstract

The invention relates to a modified crude oil demulsifier and a preparation method thereof. The structural general formula of the demulsifier is shown as formula I; the preparation method comprises the following steps: 1) performing epoxidation modification on the terminal hydroxyl of polyethylene glycol monomethyl ether; 2) enabling the modified polyethylene glycol monomethyl ether to react withchitosan to obtain polyethylene glycol monomethyl ether grafted chitosan; 3) performing alkylation modification on the polyethylene glycol monomethyl ether grafted chitosan to obtain polyethylene glycol monomethyl ether grafted alkylated chitosan; 4) performing carboxyl alkylation modification on the polyethylene glycol monomethyl ether grafted alkylated chitosan to obtain polyethylene glycol monomethyl ether grafted alkylated carboxyl alkyl chitosan. With chitosan type natural high-molecular compounds as raw materials, the modified crude oil demulsifier provided by the invention has the advantages of wide source, natural property, no toxicity, high biocompatibility, degradability and the like. A series of efficient demulsifiers suitable for oil-in-water (O/W) type emulsion are obtained byintroducing carboxyl alkyl, alkyl and polyether side chain to a chitosan molecular chain and controlling the position and substitution degree of each substituent.

Description

technical field [0001] The invention relates to a modified crude oil desalting demulsifier and a preparation method thereof, belonging to the field of petrochemical industry. Background technique [0002] In the process of oilfield exploitation, with the implementation of oil recovery technologies such as steam flooding, surfactant, polymer and ASP flooding, the water content of crude oil emulsion increases, and the stability is enhanced, making it more difficult to break the emulsion of crude oil. The formation of emulsion will bring a series of serious hazards to the exploitation, transportation and processing of petroleum. The emulsification of crude oil and water will make the extraction of crude oil more difficult; when transporting water-containing crude oil by pipeline or tanker truck, it will increase the load of the pump and the transportation cost. Therefore, it is very necessary to desalt and dehydrate the crude oil emulsion before crude oil transportation and pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04C08G81/00
CPCC08G81/00C10G33/04C10G2300/1033
Inventor 吕仁亮张成梁成王存文徐彩丽覃远航王为国冯魏良徐汶
Owner WUHAN INSTITUTE OF TECHNOLOGY
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