油水乳液中水合物法分离甲烷/乙烯生成动力学

摘要

低碳烯烃的分离在石化行业有着重要意义。使用恒容的釜式反应器进行了水合物法分离甲烷和乙烯混合气动力学实验，并研究了不同温度和乳液用量对于水合分离效果和生成动力学的影响。在温度为273.35 K、100 ml乳液用量条件下，混合气中乙烯含量从34%降至9.97%，回收率达到90.36%，温度越低、乳液量越多，乙烯回收率越高。提出了一套以逸度差为推动力的动力学模型，能够较好地拟合实验数据，同时根据参数能够较好地预测实验结果。%Low-carbon olefin separation is important in petrochemical industry. Separation of methane/ethylene mixture was studied by hydrate formation in water-in-oil (w/o) emulsion during isochoric and isothermal processes in an agitated reactor. With pressure-volume-temperature (PVT) method, the ethylene hydrate formation kinetics and separation efficiency were evaluated at various operating conditions of temperature and emulsion consumption. Ethylene concentration in gas mixture decreased from 34% to 9.97% and its recovery achieved to 90.36% with the use of 100mL emulsion at temperature of 273.35 K. Lower temperature and more emulsion were favorable for the recovery of ethylene. A kinetics-controlled model using fugacity difference as the driving force was proposed, which fitted the experiment data well and could predict experimental output accurately from operating parameters.