某公司POX合成气甲醇洗装置外排废甲醇约3 000 t/a，定量分析其中含有杂质质量分数苯为41.97%、甲醇为57.88%。利用小型固定流化床装置进行废甲醇催化裂化实验，在剂醇比为9和525℃反应温度下，气体产品中C₃~C₄液化石油气收率为3.86%，C₅~C₅⁺轻汽油收率为4.76%；液体收集系统的轻质油品收率为13.99%。催化裂化装置掺炼废甲醇比例以3%~4%最佳，液化石油气收率可提高2.0%~2.5%，其中烯烃收率可提高1%~2%。

A certain refinery company discharges 3,000 t/a waste methanol from its POX methanol wash unit.Through qualitative analysis by mass spectrometry,the mass fractions of benzene and methanol in waste methanol are 41.97 w% and 57.88 w%,respectively.The waste methanol is used as raw material for FCC reaction in a small fixed fluidized bed experimental device.The yields of C₃-C₄ and C₅-C₅⁺ in the gas products are 3.86% 4.76%,respectively at a reaction temperature of 525℃ when the ratio of catalyst to methanol is 9.The yield of light oil in liquid collection system is 13.99%.It is suggested that the best blending proportion of waste methanol in FCC is in the range of 3%-4%.Through blending,LPG yield can be increased by 2-2.5 percentage points and the yield of olefins in LPG can be increased by 1%-2%.