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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 - 6的钒
In the semi-continuous extraction unit, VCC-R (393 × 10 -6 Ni and 3110 × 10 -6 vanadium) obtained from the Veba coal cracking process was extracted with toluene to remove residual oil The results showed that the recoveries of VCC-R ranged from 64% to 69% (daf) and the extracts were mainly in the range of 100 ~ 350 ℃, the mass fraction of nickel and vanadium is less than 6 × 10 ~ 6, indicating that 98% and 99% of the nickel and vanadium have been removed.The extraction residue concentrates the heavy metals and ash in VCC-R, and has a very low hydrogen Nickel content greater than 1000 × 10 6 and mass fraction of vanadium greater than 60 × 0 × 10 6