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促进水合物快速生成是天然气水合物技术产业化的关键,表面活性剂作为水合物生成的促进剂,对其动力学促进作用进行研究十分必要。本文在已有的天然气水合物储气实验台上,利用高压反应釜,在温度为(274.15±0.10)K,压力为(8.30±0.10)MPa条件下研究了非离子表面活性剂失水山梨醇单油酸酯(Span 80)存在下的甲烷水合物生成过程。结果表明:Span 80的加入有利于甲烷气体分子进入水相中,加快了晶核形成过程,缩短了甲烷水合物生成的诱导时间,提高了生成速率和表观速率常数,并提高了相应反应时间内甲烷水合物的储气密度。通过分析Span 80的分子结构,对其促进甲烷水合物的生成机理进行了研究,认为Span 80分子中的三个羟基和四氢呋喃结构与水分子形成氢键以及羰基对水分子的固定作用共同促进了甲烷水合物的生成。
Promote the rapid formation of hydrate is the key to the industrialization of natural gas hydrate technology. As a hydrate-forming accelerator, surfactant is very necessary to study its kinetic promoting effect. In this paper, the non-ionic surfactant sorbitan was studied on the existing gas hydrate gas storage bench using a high pressure reactor at a temperature of (274.15 ± 0.10) K and a pressure of (8.30 ± 0.10) MPa Methane hydrate formation in the presence of monooleate (Span 80). The results show that the addition of Span 80 is beneficial to the entry of methane gas molecules into the aqueous phase, accelerating the nucleation process, shortening the induction time of methane hydrate formation, increasing the formation rate and apparent rate constant, and increasing the corresponding reaction time Methane hydrate gas storage density. By analyzing the molecular structure of Span 80 and studying its mechanism of promoting the formation of methane hydrate, it is believed that the three hydroxyl and tetrahydrofuran structures in Span 80 molecule form hydrogen bonds with water molecules and the carbonyl groups fix water molecules together Formation of methane hydrate.