关键词: MTO装置, 急冷水, 过滤, 旋液分离器, 金属滤芯过滤器, 非金属膜过滤器, 沸腾床过滤器

Abstract: Methanol to olefins (MTO) technology is an important production technology of ethylene and propylene at present. The problem of high impurity content in quench water is common in MTO units, which affects the stable operation of the unit. Therefore, it is very important to select the appropriate quench water filtration technology. Catalyst fine powder and waxy material are the major impurities in MTO quench water. The concentration of catalyst fine powder can reach 20~500 mg/L, and the particle size is less than 5 μm. The waxy material is mainly composed of polycyclic aromatic hydrocarbons. The catalyst fine powder and waxy material can form suspended matter in quench water, which increases the difficulty of separation. At present, the applied MTO quench water filtration technologies include hydrocyclone, sintered metal filter, expansion drum tube filter and ebullated bed filter, etc. The practical application effect of ebullated bed filter is better, and the combination of ebullated bed filter and hydrocyclone is the best MTO quench water filtration scheme at present.    

Key words: MTO unit, quench water, filtration, hydrocyclone, sintered metal filter, expansion drum tube filter, ebullated bed filter