A kind of chitosan oil-in-water type crude oil demulsifier and preparation method thereof
A crude oil demulsifier, oil-in-water type technology, applied in chemical dehydration/demulsification, treatment of hydrocarbon oil, petroleum industry, etc., can solve the problems of secondary pollution, poor environmental friendliness of demulsifier, etc.
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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) Preparation of butyl chitosan: accurately weigh 1.0g chitosan (CS) (M w =179.17kDa, degree of deacetylation >95%, viscosity 100-200mPa·s) in a 250mL three-necked flask, add 12mL isopropanol, 2g potassium hydroxide, and heat up to 40°C under stirring conditions and keep the temperature for 2h to make chitosan Alkalization of sugar. After the alkalization was completed, 3 mL of n-butane bromide was slowly added dropwise at the same reaction temperature, and the reaction was carried out at constant temperature for 6 hours. After the reaction was completed, 20 mL of methanol was added to the three-necked flask to wash out the product. Use dilute hydrochloric acid with a mass fraction of 10% to adjust the pH of the system to 7, add 10mL of acetone as a precipitating agent, let it stand for precipitation and then filter, wash the...
Embodiment 2
[0048] The preparation of the hexyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:
[0049] (1) Preparation of hexyl chitosan: accurately weigh 1.0g chitosan (CS) (M w =179.17kDa, degree of deacetylation >95%, viscosity 100-200mPa·s) in a 250mL three-neck flask, add 12mL of distilled water, 2g of potassium hydroxide, and steadily raise the temperature to 40°C under stirring conditions and keep the temperature for 2h to make the chitosan base change. After the alkalization was completed, 3 mL of n-bromohexane was slowly added dropwise at the same reaction temperature, and the reaction was carried out at constant temperature for 6 hours. After the reaction was completed, 20 mL of methanol was added to the three-necked flask to wash out the product. Use dilute hydrochloric acid with a mass fraction of 10% to adjust the pH of the system to 7, add 10mL of acetone as a precipitating agent, let it stand for precipitation and...
Embodiment 3
[0054] The preparation of the octyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:
[0055] (1) Preparation of octyl chitosan: accurately weigh 1.0g chitosan (CS) (M w =179.17kDa, degree of deacetylation >95%, viscosity 100-200mPa·s) In a 250mL three-necked flask, add 6mL of distilled water, 12mL of isopropanol, 2g of potassium hydroxide, and steadily raise the temperature to 40°C under stirring and keep the temperature for 2h Alkalinize chitosan. After the alkalization was completed, 3 mL of n-octane bromide was slowly added dropwise at the same reaction temperature, and the reaction was carried out at constant temperature for 6 hours. After the reaction was completed, 20 mL of methanol was added to the three-necked flask to wash out the product. Use dilute hydrochloric acid with a mass fraction of 10% to adjust the pH of the system to 7, add 10mL of acetone as a precipitating agent, let it stand for precipitation an...
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