Polyether grafted oil-in-water type crude oil demulsifier and preparation method thereof
A crude oil demulsifier and oil-in-water type technology, which is applied in chemical dehydration/demulsification, petroleum industry, hydrocarbon oil treatment, etc., can solve the problems of poor environmental friendliness and secondary pollution of demulsifiers, and achieve strong competitive adsorption High performance, neat oil-water interface, and good safety in use
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Embodiment 1
[0042] The preparation of the butyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:
[0043] (1) Synthesis of formylated polyethylene glycol monomethyl ether: get polyethylene glycol monomethyl ether (M n =5000) 5g (1mmol) dissolved in 2mL chloroform, keep the reaction in a nitrogen environment, add 1.1mL (10mmol) acetic anhydride and 30mL anhydrous dimethyl sulfoxide at room temperature under constant stirring, raise the temperature to 35°C, and react at constant temperature for 15h . After the reaction was completed, the reaction solution was added to 400 mL of anhydrous ether, and the obtained precipitate was dissolved in chloroform and then recrystallized with ether solution (repeat this step once), and then vacuum-dried at room temperature for 24 h to obtain the formylated polyethylene glycol mono methyl ether.
[0044] (2) Synthesis of chitosan grafted with polyethylene glycol monomethyl ether: accurately weigh 1...
Embodiment 2
[0048] The preparation of the hexyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:
[0049] (1) Synthesis of formylated polyethylene glycol monomethyl ether: get polyethylene glycol monomethyl ether (M n =1900) 1.9g (1mmol) dissolved in 2mL chloroform, keep the reaction in a nitrogen atmosphere, add 1.1mL (10mmol) acetic anhydride and 30mL anhydrous dimethyl sulfoxide at room temperature under constant stirring, raise the temperature to 35°C, and react at a constant temperature 15h. After the reaction was completed, the reaction solution was added to 400 mL of anhydrous ether, and the obtained precipitate was dissolved in chloroform and then recrystallized with ether solution (repeat this step once), and then vacuum-dried at room temperature for 24 h to obtain the formylated polyethylene glycol mono methyl ether;
[0050] (2) Synthesis of chitosan grafted with polyethylene glycol monomethyl ether: accurately weigh 1.0...
Embodiment 3
[0054] The preparation of the octyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:
[0055] (1) Synthesis of formylated polyethylene glycol monomethyl ether: get polyethylene glycol monomethyl ether (M n =750) 0.75g (1mmol) dissolved in 2mL chloroform, keep the reaction in a nitrogen environment, add 1.1mL (10mmol) acetic anhydride and 30mL anhydrous dimethyl sulfoxide under constant stirring at room temperature, raise the temperature to 35°C, and react at a constant temperature 15h. After the reaction was completed, the reaction solution was added to 400 mL of anhydrous ether, and the obtained precipitate was dissolved in chloroform and then recrystallized with ether solution (repeat this step once), and then vacuum-dried at room temperature for 24 h to obtain the formylated polyethylene glycol mono methyl ether;
[0056] (2) Synthesis of octylcarboxymethyl chitosan grafted with polyethylene glycol monomethyl ether: ...
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