Chemical-Enzyme Catalytic Synthesis Of Lipopeptide Surfactants Based On Fish Scale Collagen And Its Application In Improving Oil Recovery
Keywords
Fish Scale Collagen, Lipopeptide, Emulsification Index, Surfactant Drive, Oil Recovery, Static Oil Washing, Sand-Filled Pipe Oil Flooding
Abstract
Use alkaline protease Protex6L or 6mol/LHCl to hydrolyze fish scale collagen to obtain polypeptide hydrolysates with hydrolysis degrees of 0, 5%, 10% and 100%, respectively using alkyl acid chlorides (oleoyl chloride, lauroyl chloride) with different chain lengths. and decanoyl chloride) and benzoyl chloride to acylate the polypeptide to prepare 16 lipopeptide surfactants with different hydrophilic and lipophilic groups, and evaluate their emulsifying properties, static oil washing and dynamic oil displacement properties. The results show that compared with the emulsification index E24 of the chemical surfactant sodium dodecylbenzene sulfonate (SDBS) commonly used for oil displacement, which is only 20% at maximum, the lipopeptide has better emulsification performance, with a hydrolysis degree of 5% at 500mg/L. The E24 of the oleoyl lipopeptide reaches more than 60%. The oleoyl lipopeptide and lauroyl lipopeptide with a pH value of 11.0 and a hydrolysis degree of 10% have the strongest oil washing ability. They can remove 35% of the oil within 20 minutes at 150r/min at 40¡æ. The above crude oil is eluted from the oil sand, which is much higher than the oil washing rate of SDBS (<10%). After water flooding oil recovery, injecting oleoyl lipopeptide or lauroyl peptide with a hydrolysis degree of 10% can significantly improve the recovery rate of crude oil. , the oil production increase rates reached 52.35% and 41.18% respectively. For further information of this article and research, feel free to contact our team for asssitance. Original research was done by Liu Xiangyu, Zhang Guifeng, Zhang Yufei, Wang Ping, Su Zhiguo, Ma Guanghui, Zhang Songping
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