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通过对常压下9%(ω)TBAB溶液降温生成水合物晶体的过程进行观察,以过冷度作为生长驱动力,研究了TBAB水合物晶体的生长特性.TBAB水合物刚形成时,晶体呈高透光度及规则柱体外形,随晶体继续生长逐渐变得不规则,透光度下降.当恒温浴的过冷度分别为6.0,8.1和9.6K时,水合物晶体长度/宽度方向生长时间依次为183min/140min,85min/65min,70min/37min,同时反应前的等待时间即生成时间分别为83,53和55min.生长时间和生成时间随过冷度增加逐渐降低,幅度逐渐减小,表明过冷度增加能有效减少水合反应时间,促进水合物的快速生成.过冷度增加会增加TBAB水合物晶体成核数量,因此晶体与溶液的总体接触面积增加,有利于水合物的快速形成.
The growth of TBAB hydrate crystal was studied by observing the cooling process of 9% (ω) TBAB solution at normal pressure and forming the hydrate crystal. The growth characteristics of TBAB hydrate crystal were studied by using subcooling degree as growth driving force. High transparency and regular cylinder shape, gradually becoming irregular with the continued growth of the crystal, the transmittance decreased.When the undercooling degree of the bath were 6.0, 8.1 and 9.6 K respectively, the hydrate crystal length / width direction growth The time was 183min / 140min, 85min / 65min, 70min / 37min, respectively, while the waiting time before the reaction was 83, 53 and 55min respectively.The growth time and the formation time decreased gradually with the increase of undercooling, The results show that the increase of undercooling can effectively reduce the hydration reaction time and promote the rapid formation of hydrate.The increase of undercooling will increase the nucleation quantity of TBAB hydrate crystal and thus increase the total contact area between crystal and solution and facilitate the rapid formation of hydrate .