Viscoelastic betaine surfactant composition for oil displacement
A technology of surfactant and composition, applied in the field of viscoelastic betaine surfactant composition for oil displacement, can solve problems such as low oil displacement efficiency, achieve high interfacial activity, strong oil washing ability, and enhanced oil recovery Effect
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Embodiment 1
[0029] 1. Surfactant Preparation
[0030] (1) Erucamide sultaine surfactant (R 1 =C 21 , R 2 =C 3 , R 3 =C 2 , R 4 and R 5 =C 1 )preparation
[0031] a) Add 0.5 mole of methyl erucate and the required amount of amidating reagent N,N-dimethylpropylenediamine into the reaction kettle, react at 145°C for 7 hours, turn on the vacuum pump, and remove the methanol and Excessive N,N-dimethylpropylenediamine to obtain erucic acid acyl tertiary amine product, then add the required amount of 3-chloro-2-hydroxypropanesulfonate sodium, react at 75°C for 10 hours, and dissolve in absolute ethanol After recrystallization and purification, long carbon chain betaine surfactant is obtained; wherein, methyl erucate: N, N-dimethylpropylenediamine: the molar ratio of 3-chloro-2-hydroxypropanesulfonate sodium is 1:2 :1.5.
[0032] b) The hydroxy-substituted benzene carboxylate and the erucamide sulfobetaine surfactant prepared by the present invention are respectively dissolved in water...
Embodiment 2
[0040] 1. Surfactant Preparation
[0041] (1) palmitic acid amide sulfobetaine surfactant (R 1 =C 15 , R 2 =C 2 , R 3 =C 3 h 6 O, R 4 and R 5 =C 1 )preparation
[0042] a) Add 0.5 mole of long carbon chain hexadecanoic acid methyl ester and the required amount of amidating reagent N,N-dimethylethylenediamine into the reaction kettle, react at 130°C for 6 hours, turn on the vacuum pump, and pump out the reaction Produced methanol and excess N,N-dimethylethylenediamine to obtain palmitic acid acyl tertiary amine product, then add the required amount of 3-chloro-2-hydroxypropanesulfonate to react at 70°C for 12 hours, use Long carbon chain betaine surfactant is obtained after dehydrated alcohol recrystallization purification; Wherein, methyl palmitic acid: N, N-dimethylethylenediamine: the mol ratio of 2-chloroethylsulfonate sodium is 1: 2:1.5.
[0043] b) The hydroxy-substituted benzene carboxylate and the palmitic acid amide sulfobetaine surfactant prepared by the p...
Embodiment 3
[0046] 1. Surfactant Preparation
[0047] (1) triacic acid amide sulfobetaine surfactant (R 1 =C 29 , R 2 =C 3 , R 3 =C 2 , R 4 and R 5 =C 1 )preparation
[0048] a) Add 0.5 moles of long-chain triacic acid methyl ester and the required amount of amidating reagent N,N-dimethylpropylenediamine into the reaction kettle, react at 150°C for 8 hours, turn on the vacuum pump, and pump out the reaction Produced methanol and excess N,N-dimethylpropylenediamine to obtain triacyl acyl tertiary amine product, then add the required amount of sodium 2-chloroethylsulfonate, react at 85 ° C for 16 hours, after no Obtain the long carbon chain betaine surfactant after water ethanol recrystallization purification; Wherein, triacic acid methyl ester: N, N-dimethyl propanediamine: the molar ratio of 2-chloroethylsulfonate sodium is 1:2 :1.6.
[0049] b) The hydroxy-substituted benzene carboxylate and the triacic acid amide sulfobetaine surfactant prepared by the present invention are r...
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