Abstract: Methane hydrate can be used as a carrier to store and transport natural gas. However, they generate slowly under natural conditions,so it is necessary to improve the rate of methane hydrate formation.To this end, the effect of the amphoteric surfactant LAD⁃40 on the methane hydrate formation rate in various mass fractions (10~500 μg/g) was examined. The results show that when the pressure is constant, compared with the nucleation temperature of methane hydrate formation under pure water conditions, adding any mass fractions of LAD⁃40, the nucleation temperature of methane hydrate changes little, which fails to improve the thermodynamic conditions of methane hydrate formation; because of the existence of LAD⁃40, the gas⁃liquid contact area was increased, the nucleation time was shortened, and the hydrate form in the reactor phase. As the LAD⁃40 mass fraction increases, the methane hydrate formation rate increases linearly, and the gas consumption does not change much, however, compared with methane hydrate formation under pure water conditions, it is significantly improved.

Key words: Methane hydrate, LAD?40, Nucleation temperature, Nucleation rate, Gas consumption

摘要： 甲烷水合物可以作为载体储存、运输天然气，但在自然条件下生成缓慢，需要提高甲烷水合物的生成速率。为此，考察了双性表面活性剂LAD⁃40（月桂酰两性基二乙酸二钠）质量分数（10～500 μg/g）对甲烷水合物生成的影响。结果表明，在压力一定的条件下，LAD⁃40质量分数为0～500 μg/g时，甲烷水合物成核温度变化微小，LAD⁃40未改善甲烷水合物生成热力学条件；LAD⁃40增大了气液接触面积，缩短了成核诱导时间，随着LAD⁃40质量分数的增加，甲烷水合物生成速率线性增加，而气体消耗量变化不大，但与纯水条件下的气体消耗量相比提高显著。

关键词: 甲烷水合物, 　LAD?40, 　成核温度, 　成核速率, 　气体消耗量