基础油颜色异常的原因分析及解决方案

Analysis of the Abnormal Color of Base Oil and Solutions

通过对基础油生产原料热稳定性和溶剂组成解析,判断基础油颜色变深且发生深浅可逆变化是由溶剂中氮质量浓度异常偏高造成的。分析了溶剂系统中氮元素的可能性来源,针对性排查氨冷系统,推断溶剂氮质量浓度偏高是由于脱蜡段氨冷换热器管程发生内漏,致使氨液进入了溶剂系统。根据分析结果,切换氨冷换热器4d后,基础油颜色恢复正常。对置换下来的氨冷换热器进行检修,确认管程发生了腐蚀性内漏.

By analyzing the thermal stability of raw materials and the composition of solvents in base oil production,it was determined that the deepening of the base oil color and its reversible changes were caused by an abnormally high nitrogen mass concentration in the solvent.The possible sources of nitrogen elements in the solvent system were analyzed,and a targeted investigation of the ammonia refrigeration system was conducted.It was inferred that the high nitrogen mass concentration in the solvent was due to internal leakage in the ammonia refrigeration heat exchanger of the dewaxing section,leading to the entry of ammonia liquid into the solvent system.Based on the analysis results,after switching the ammonia refrigeration heat exchanger for four days,the color of the base oil returned to normal.Upon inspection of the replaced ammonia refrigeration heat exchanger,it was confirmed that corrosion-induced internal leakage had occurred in the tube pass of the heat exchanger.