重整抽提装置环丁砜在线再生技术应用

Application of sulpholane solvent online regeneration technology in reforming extraction unit

100万t/a重整抽提装置抽提单元使用的环丁砜溶剂经过4年的长期运转,品质下降严重,溶剂中胶质、降解产物增多导致换热器、泵、塔盘等设备堵塞以及溶剂pH降低导致设备腐蚀,同时溶剂中氯离子质量分数高,导致不锈钢设备的氯腐蚀。经过对溶剂品质、现有净化技术和手段的充分评估,决定使用移动式再生处理技术脱除溶剂系统中的胶质、降解产物、酸性物质及氯离子,改善溶剂品质,保障装置的安全平稳运行。经过约2个月的在线处理,标定结果显示,环丁砜溶剂品质有明显改善,达到了在线再生目的。

After four years of long term ruuning,the quality of sulpholane solvent declines seriously in one million tons/year reforming extraction unit.As a result,equipment blocking in the heat exchanger,pump and tower tray due to the increasing of gum and degradation products in the solvent,equipment corrosion due to the decreased pH value in solvent and the chlorine corrosion in stainless equipment,takes place.Mobile regeneration technology is used to remove the gum,degradation products,chlorine ion and other acid substances after sufficient investigating and evaluating on solvent quality and current purification technology.Thus,the quality of solvent can be improved and safety running of the unit can be guaranteed.After about two months online processing,the calibration results show the obvious improvement in the quality of sulpholane solvent,the target of online regeneration was achieved.