纤维液膜脱硫醇组合工艺在液化石油气精制中的工业应用

介绍了纤维液膜脱硫醇及碱液高效再生组合工艺在400 kt/a混合液化石油气(LPG)和催化LPG脱硫醇装置的工业应用情况。工业装置运行结果表明,混合LPG产品总硫含量基本达到150 mg/m3、催化LPG产品总硫含量基本达到50 mg/m3的设计指标要求,产品质量合格率在97%以上;脱硫醇碱液采用高效再生技术控制硫醇钠和硫化钠含量小于600μg/g、二硫化物含量小于50μg/g,系统碱液中氢氧化钠浓度稳定在20%(w)左右,碱液再生生成的二硫化物每3 d回收1 t左右。该组合工艺解决了炼厂LPG传统脱硫醇装置产品质量不稳定、波动频繁、脱硫醇碱液再生效果不理想、能耗高、碱渣排放量大等问题,并实现了副产物二硫化物的回收。

Industrial Application of Fiber Liquid Film Combination Process in Removing Mercaptan from Liquefied Petroleum Gas

Industrial application of a combination process of fiber liquid film transfer-lye high efficient regeneration,which was used in the removal of mercaptan from 400 kt/a mixed liquefied petroleum gas(LPG) and FCC LPG,was introduced.It was showed that both the total sulfur contents in the mixed LPG product and the FCC LPG product basically reached 150 mg/m3 and 50 mg/m3 respectively,and more than 97% of the product was up to standard.The concentration of NaOH in the regenerated lye was about 20%(w).Disulfides as the by-products were recovered,1 t per 3 d.The combination process for LPG from refineries can lead to more stable product quality,higher quality of regenerated lye,lower energy consumption and less emission of soda residue.