超临界甲苯萃取含重金属渣油回收有机质

Recovery of organic matter from heavy metals containing oil residue by extraction of toluene

在半连续萃取装置上 ,对 Veba联合裂解工艺中得到的渣油 VCC-R(含镍 393× 1 0 - 6 ,钒2 31 0× 1 0 - 6 )用甲苯进行萃取 ,以除去渣油中的重金属 .实验采用非等温技术 ,研究了温度、压力和溶剂类型等对萃取的影响 .结果表明 ,VCC-R的回收率在 64%～ 69% ( daf) ;萃取物主要在1 0 0～ 350℃得到 ,其中镍和钒的质量分数小于 6× 1 0 - 6 ,表明 98%和 99%的镍和钒已除去 .萃取残渣集中了 VCC-R中的重金属和灰分 ,有很低的氢含量、质量分数大于 1 0 0 0× 1 0 - 6 的镍和大于 60 0 0× 1 0 -

A residue from Veba Combi Cracking process (VCC R), with a content of nickel of 396×10 -6 and vanadium of 2 310×10 -6 , was extracted in a semi continuous extraction apparatus using toluene to remove the heavy metals in it. The experiments were carried out using non isothermal technique to investigate the effects of temperature, pressure and varieties of solvent on the extraction. The results indicate that the conversion rate of VCC R is about 64% to 69%(daf). The extract is mainly formed in the temperature range of 100 to 350 ℃ and has a nickel and vanadium content of less than 6×10 -6 which represents a nickel and vanadium removal of more than 98% and 99%, respectively. The extraction residue, which concentrates the heavy metals and ash in VCC R, contains low hydrogen, little oxygen and a nickel of more than 1 000×10 -6 , vanadium of more than 6 000×10 -6 .