水合物法分离催化裂化干气的相平衡研究

Study on Phase Equilibrium of FCC Dry Gas Separation via Hydrate Formation Processes

石油炼厂副产大量的催化裂化干气,常规的深冷分离方法存在能耗高、投资大的问题。水合物分离法是实现低沸点混合气体分离的一种新技术,其操作条件温和,降低了操作工艺要求和设备费用。采用实验研究方法,选择典型催化裂化干气组分,进行油水乳液体系中水合分离催化裂化干气的相平衡研究,分别考察温度、压力、初始气液体积比、乳化剂浓度和油水体积比等因素对水合分离的影响。结果表明,温度、压力、初始气液体积比、乳化剂浓度和油水体积比对水合分离催化裂化干气具有显著影响,分离效果随系统温度的降低或系统压力的升高或初始气液比的降低而提高。水合分离催化裂化干气的最佳操作条件为:系统温度274.15 K,压力5.0 MPa,初始气-液比90(V/V),油水比1.0(V/V),最佳乳化剂浓度配比span20(0.1%(wt))+oπ(1.0%(wt))。研究表明,在油水乳液体系中,采用水合分离方法催化裂化干气方法可行,具有很好的分离效果和工业应用潜力。

FCC （Fluid Catalytic Cracking） dry gas is the byproduct in oil refinery. Conventional cryogenic separation methods usually have high energy consumption and large investment problems, while hydrate formation separation is a new technology for low-boiling mixture gas separation. This method shows mild operating conditions, low process requirements and equipment costs. Systematic experimental studies were carried out on gas-hydrate equilibrium of a typical FCC dry gas in water-in-oil emulsion. The influence of temperature, pressure, initial gas-liquid volume ratio, concentration of anti-agglomerant and oil-water volume ratio on separation efficiency was investigated. Experimental results show that these factors all have important effects on the separation process. The decrease of temperature and initial gas-liquid volume ratio or increase of operating pressure can enhance separation efficiency. The optimum operating conditions are 274.15 K, 5.0 MPaG, R = 90 V/V, Q = 1：1 V/V, and span20 （0.1%（wt）） ＋ oπ （1.0%（wt））. The results indicate that hydrate formation separation can be used to effectively separate FCC dry gas with great industrial application prospects.