Alkali-free surface active agent for displacing oil and preparation method thereof
A surfactant and oil displacement technology, which is applied in the field of alkali-free surfactant for oil displacement and its preparation, can solve the problems of alkali damage to formation in ASP flooding, and achieve non-toxic and harmless products and good stability. , the effect of simple synthesis process
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Embodiment 1
[0026] (1) Add 1 mol of dodecylamine to a four-neck flask, heat to a molten state, slowly add 1.1 mol of methyl acrylate dropwise under mechanical stirring, complete the dropwise addition within 3.5 hours, and react at a constant temperature of 65°C for 4 hours. After completion of the reaction, excess methyl acrylate was distilled off under reduced pressure at 0.03 MPa to obtain methyl dodecylaminopropionate. The yield is 98.5%. The equation is as follows:
[0027]
[0028] (2) Add 1 mol of methyl dodecylaminopropionate to a four-neck flask, heat at 90°C until molten, add 1.05 mol of N,N-dimethyl-1,3-propanediamine, and add di React with 5% NaOH methanol solution or KOH methanol solution of the total mass for 1 hour, install a water separator, slowly raise the temperature to 135-150°C, reflux for 5 hours under reduced pressure of 0.03MPa, recover methanol, and consider the reaction until no methanol is formed. At the end point, the mass percentage concentration of NaOH m...
Embodiment 2
[0033] (1) Add 1 mol of aliphatic amine to a four-neck flask, heat to a molten state, slowly add 1.2 mol of methyl acrylate dropwise under mechanical stirring, complete the dropwise addition within 3.5 hours, and react at a constant temperature of 65°C for 4 hours. After the reaction is completed, excess methyl acrylate is distilled off under reduced pressure at 0.03 MPa to obtain methyl aliphatic aminopropionate. The yield is 98%.
[0034] (2) Add 1 mol of aliphatic methyl aminopropionate to a four-necked flask, heat it to a molten state at 90°C, add 1.05 mol of N,N-dimethyl-1,4-butanediamine, and add both React with 5% NaOH methanol solution or KOH methanol solution of the total mass for 1 hour, install a water separator, slowly raise the temperature to 135-150°C, and reflux reaction for 5 hours under reduced pressure of 0.03MPa, recover methanol, until no methanol is formed, it is regarded as the end of the reaction . The yield is 92%.
[0035] (3) Put the quaternization...
Embodiment 3
[0037] (1) Add 1 mol of aliphatic amine to a four-neck flask, heat to a molten state, slowly add 1.1 mol of butyl acrylate dropwise under mechanical stirring, and complete the dropwise addition within 3.5 hours, and react at a constant temperature of 65°C for 4 hours. After the reaction is completed, the excess butyl acrylate is distilled off under reduced pressure at 0.03 MPa to obtain fatty aminopropionate butyl. Yield 97.5%.
[0038](2) Add 1 mol of aliphatic butyl aminopropionate to a four-necked flask, heat it to a molten state at 90°C, add 1.1 mol of N,N-dimethyl-1,5-pentanediamine, and add both React with 5% NaOH methanol solution or KOH methanol solution of the total mass for 1 hour, install a water separator, slowly raise the temperature to 135-150°C, reflux reaction for 5 hours under reduced pressure of 0.03MPa, recover methanol, until no methanol is formed, it is regarded as the end of the reaction . The yield is 91%.
[0039] (3) Put the quaternization reagent i...
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