Patent ID: 11906244
Assignee: UOP LLC
Field: Chemical engineering (Chemistry)
Classification: CPC F | IPC F

Claim 3:
4. The process of claim 1 wherein
(i) said distillation vapor stream is heated to form a heated distillation vapor stream, thereby to supply at least a portion of said cooling in steps a and d;
(ii) said heated distillation vapor stream is compressed and cooled to form a cooled compressed distillation vapor stream;
(iii) said cooled compressed distillation vapor stream is divided to form said volatile residue gas fraction and a recycle stream;
(iv) said recycle stream is cooled to condensation to form a cooled recycle stream, thereby to supply at least a portion of said heating in step (i);
(v) said cooled recycle stream is expanded to said lower pressure to form an expanded cooled recycle stream, whereupon said expanded cooled recycle stream is supplied to said distillation column at said top feed position; and
(vi) said combined stream is supplied to said distillation column at an upper mid-colunin feed position, said upper mid-column feed position being below said top feed position and above said mid-column feed position.