Patent ID: 8685175

Claim:
A process for removing used regenerant from a regenerated drier in a system for isomerizing a hydrocarbon stream rich in a C4 hydrocarbon and/or rich in at least one of a C5 and C6 hydrocarbon, said process comprising: a. using at least one valve and at least one of a control valve or restriction orifice to displace used regenerant from the newly regenerated drier in an up-flow manner to a low pressure device until the pressure of the newly regenerated drier reaches from 14 kPag to 69 kPag (2 to 10 psig) wherein the used regenerant is selected from the group consisting of an isomerized C4 hydrocarbon product, an isomerized C5-C6 hydrocarbon product, and a gas; b. displacing used regenerant from at least a portion of cross-over piping between the newly regenerated drier and a second drier using at least one valve and at least one of the control valve or the restriction orifice; and c. operating both the newly regenerated drier and the second drier in series for a period of time.