Isomerization of N-heptane in naphtha cuts

A process for the isomerization of normal heptane contained within a naphtha stream comprising the steps of:

• feeding a C6-C8 naphtha stream to a first fractionation to produce a first overheads comprising normal heptane and lighter materials and a first bottoms comprising C8 naphtha;
• feeding the first overheads containing normal heptane to a second fractionation to produce a second overheads containing lighter materials and a second bottoms containing the normal heptane;
• returning the second bottoms containing normal heptane to an isomerization zone having a single effluent containing branched heptane isomerization product and unconverted normal heptane to the first fractionation, whereby the unconverted normal heptane and the branched heptane isomerization product are taken in the first overheads to the second fractionation and the branched heptane isomerization product covered in the second overheads.

A process for the isomerization of normal heptane contained within a naphtha stream comprising the steps of:

• feeding a C6-C8 naphtha stream to a first fractionation to produce a first overheads comprising normal heptane and lighter materials and a first bottoms comprising C8 naphtha;
• feeding the first overheads containing normal heptane to an isomerization zone having a single effluent containing branched heptane isomerization product and unconverted normal heptane to a second fractionation to produce a second overheads containing lighter materials including the branched heptane isomerization product and a second bottoms containing unconverted normal heptane;
• returning the second bottoms to the first fractionation, whereby the unconverted normal heptane are returned to the isomerization zone in the first overheads.