Compound oil-displacing agent containing asymmetric di-long chain alkylmethyl carboxyl betaine and application thereof
A technology of double long-chain alkylmethyl carboxyl and long-chain alkyl dimethyl carboxyl, which is applied in the field of compound oil displacement agents and can solve problems such as poor water solubility
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Embodiment 1
[0034] Embodiment 1: N-octadecyl-N-hexylmethyl tertiary amine (C 18+6 A) Preparation. With stearic acid (C 18 ) is the initial raw material, called reactant A, reacts with thionyl chloride, and thionyl chloride is called reactant B. According to the molar ratio A:B=1:1.4, add 0.5mol (142g) A, 1mL N,N-dimethylformamide (DMF), 50mL dichloromethane into a 500mL three-necked flask, and heat to 55°C. Weigh 0.7mol (83.3g) B in a beaker, quickly transfer it to a 250mL constant pressure funnel, and dropwise add it to a three-necked flask. HCl and SO produced by the reaction 2 The acid gas is absorbed and treated with 700mL 10% NaOH aqueous solution. After the addition of B was completed, the temperature was raised to 65°C, and the reaction was continued for 2h. After the reaction, use a circulating water vacuum pump to extract the residual B and dichloromethane while it is hot (50-60° C.) to obtain the intermediate product stearoyl chloride, which is called intermediate C. The r...
Embodiment 2
[0045] Embodiment 2: N-octadecyl-N-hexylmethylcarboxybetaine (C 18+6 B) Preparation. According to the molar ratio I:(chloroacetic acid)=1:1.1, add 0.05mol tertiary amine and 10mL aqueous solution dissolved with 0.055mol chloroacetic acid into a 250mL three-necked flask, stir vigorously and slowly raise the temperature to 80°C. According to the molar ratio (chloroacetic acid): NaOH = 1:1.1, add 10 mL of an aqueous solution dissolved with 0.0605 mol of NaOH into the three-necked flask dropwise within 0.5 to 1 h. After the dropwise addition, the temperature of the material was raised to reflux temperature (100° C.) to continue the reaction for 10 h. After the reaction was finished, 20% chloroacetic acid and a corresponding amount of NaOH were added, and the reaction was continued for 4 hours to obtain the target product (J). The yield is about 80%, and the reaction formula is as follows:
[0046]
[0047] Purification of the product: After the reaction is completed, add an ...
Embodiment 3
[0048] Embodiment 3: N-octadecyl-N-hexylmethylcarboxybetaine (C 18+6 B) Structural characterization. For purified products (C 18+6 B) Structural characterization by infrared spectroscopy, mass spectrometry and NMR.
[0049] figure 1 It is the infrared spectrogram of the purified product (J). at 1643cm -1 The absorption peak at is the stretching vibration of the C=O bond, 1305cm -1 The absorption peak at is the stretching vibration of C–O, indicating that there is a –COO- group in the structure. 2927cm -1 and 2856cm -1 The absorption peaks are the asymmetric and symmetric stretching vibrations of the C-H bond, respectively, at 1469cm -1 and 1394cm -1 is the bending vibration of the C-H bond, 727cm -1 It is the bending vibration of the long-chain alkyl group, which matches the length of the two long-chain alkyl groups in the molecule. 1076cm -1 and 885cm -1 The weaker absorption bands at are the stretching and bending vibrations of the C-N bond, respectively.
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