Preparation method of double-ion type crude oil desalting demulsifier
A dual-ion and demulsifier technology, applied in the direction of chemical dehydration/demulsification, etc., can solve the problems of weak binding ability and extraction of metal cations, etc., achieve high molecular weight, easy penetration, and increase the difficulty of demulsification
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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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