Method and process for dechlorinating coal tar

• Main Authors: LI LIZHEN, WANG WANJUN, ZHANG AN, WANG YANZHEN, DUAN HONGLING, SONG CHUNMIN
• Format: Patent
• Language: Chinese; English
• Published: 27.05.2022
• Subjects: CHEMISTRY; CRACKING HYDROCARBON OILS; FUELS; LUBRICANTS; METALLURGY; MINERAL WAXES; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; TECHNICAL GASES CONTAINING CARBON MONOXIDE

The method is characterized in that ammonia water is used as a reaction extraction agent, coal tar and ammonia water are stirred and mixed, and the reaction is kept for 10-120 min; settling a reaction product for 10-200 minutes, and separating a water phase from an oil phase; respectively evaporating the water phase and the oil phase to recover ammonia water, and obtaining chlorine-containing recovered oil and dechlorinated coal tar. In addition, the invention also provides process equipment for realizing the method, the provided process and equipment comprise two reactors, two settlers and two evaporation towers, through two-stage reaction extraction, the chlorine content of the dechlorinated coal tar can be reduced to below 10mu g/g, and the dechlorination rate can reach more than 90%. 一种煤焦油脱氯的方法及工艺，其特征为使用氨水为反应萃取剂，将煤焦油与氨水搅拌混合，保持反应10-120min；然后将反应产物沉降10-200分钟，将水相和油相分开；水相和油相分别进行蒸发回收氨水，并得到含氯回收油和脱氯煤焦油。除此之外，还提供了实现该方法的工艺设备，提供的工艺和设备包括两个反应器，两个沉降器和两个蒸发塔，经两级反应萃取，脱氯煤焦油的氯含量可降至10μg/g以下，脱氯率可达90％以上。