Thoutam Pranav, Rezaei Gomari Sina, Chapoy Antonin, Ahmad Faizan, Islam Meez
Department of Chemical Engineering, School of Science Engineering and Design, Teesside University, Middlesbrough TS1 3BX, U.K.
Institute of Petroleum Engineering, Heriot-Watt University, Edinburgh EH14 4AS, U.K.
ACS Omega. 2019 Oct 21;4(19):18210-18218. doi: 10.1021/acsomega.9b02157. eCollection 2019 Nov 5.
Gas-hydrate formation has numerous potential applications in the fields of water desalination, capturing greenhouse gases, and energy storage. Hydrogen bonds between water and guest gas are essential for hydrates to form, and their presence in any system is greatly influenced by the presence of either electrolytes or inhibitors in the liquid or impurities in the gas phase. This study considers CH as a gaseous impurity in the gas stream employed to form hydrates. In developing gas-hydrate formation processes to serve multiple purposes, CO hydrate formation experiments were conducted in the presence of another hydrate-forming gas, CH, at low concentrations in saline water. These experiments were conducted in both batch and stirred tank reactors in the presence of sodium dodecyl sulfate (SDS) as a kinetic additive at 3.5 MPa and 274.15 K, under isobaric and isothermal conditions. Gas loading was taken as the detection criterion for hydrate formation. It was observed that overall gas loading was hindered by more than 70% with the addition of salts after 2 days. The addition of CH to the gas stream led to a further reduction of approximately 30% of gas loading in the batch reactor under quiescent conditions. However, the addition of 100 ppm of SDS improved the gas loading by recovering 34% of the loss observed in volumetric gas loading through the addition of salts and CH. The introduction of stirring improved the gas loading, and 64% of the loss was recovered through the addition of salts and CH after 34 h. The investigation was continued further by substituting CH with N, whereupon accelerated hydrate formation was observed.
气体水合物的形成在海水淡化、捕获温室气体和能量存储等领域有众多潜在应用。水与客体气体之间的氢键对于水合物的形成至关重要，并且它们在任何系统中的存在都会受到液相中的电解质或抑制剂或者气相中的杂质的显著影响。本研究将CH视为用于形成水合物的气流中的气态杂质。在开发用于多种目的的气体水合物形成过程中，在盐水体系中，于低浓度的另一种水合物形成气体CH存在的情况下进行了CO水合物形成实验。这些实验在3.5MPa和274.15K的等压等温条件下，在存在十二烷基硫酸钠（SDS）作为动力学添加剂的间歇式和搅拌釜式反应器中进行。气体装载量被用作水合物形成的检测标准。观察到在添加盐类2天后，总体气体装载量受到超过70%的阻碍。在静态条件下，向气流中添加CH导致间歇式反应器中的气体装载量进一步降低约30%。然而，添加100ppm的SDS通过弥补因添加盐类和CH而在体积气体装载量中观察到的34%的损失，提高了气体装载量。引入搅拌改善了气体装载量，并且在34小时后通过添加盐类和CH弥补了64% 的损失。通过用N替代CH进一步继续该研究，随后观察到水合物形成加速。
