Synthesis of Surfactants from Alkali Lignin for Enhanced Oil Recovery |
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| Authors: | Shuyan Chen Shicheng Shen Xiang Yan Jie Mi Gehua Wang |
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| Affiliation: | 1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, China;2. Liuorine Silicon and Salt Chemical Group of Luxi Chemical Group Corporation Limited, Liaocheng, China;3. Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan, China;4. Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan, China |
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| Abstract: | With the cheap and abundant resource of alkali lignin as feedstock, surfactants for enhanced oil recovery were synthesized by amination and alkylation reaction of lignosulfonate. The effects of amination conditions, including the ratio of raw materials, amination reagent, temperature, and reaction time, on nitrogen contents and surface tension of the surfactants were investigated. The results showed that ethylenediamine was more suitable for amination, and the molar ratio of alkali lignin, ethylenediamine, and formaldehyde was 1:2:1.5 at 80°C for 5 hours. The structure of synthesized products was characterized by Fourier transform infrared spectrometry. The HLB value of synthesized product was 10. The interfacial tension between Daqing crude oil and synthetic water could be decreased to 10?2 mN/m with synthesized surfactant and NaOH at 45°C. Moreover, the effects of molecular weight of surfactants on interfacial tension were also studied. The synthesized surfactant (Mw > 10,000) showed a better interfacial activity on Daqing crude oil. |
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| Keywords: | Alkali lignin amination interfacial tension surfactant surface tension |
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