Boost Octane and Throughput of C5 Isomerization Units

Advancements in distillation plays a key role in enhancing & debottlenecking existing units in a refinery.

DWC’s can boost the octane of isomerization units by 2-4 points. An isomerization process converts low octane straight chain hydrocarbons to high octane branched chain isomers. Since the isomerization reactions are in equilibrium, the product octane is defined by the number of separation units in the process.

A typical light naphtha isomerization unit with a deisohexanizer (DIH) column can produce an isomerate product of RON 87-88. For further increase in RON additional deisopentanizer (DIP) and depentanizer (DP) columns are required. Dividing wall column retrofits in existing DIH column and provides it with an additional functionality of a DIP or a DP column. Also Read..

CS2 removal to meet new specifications for Petrochemical Naphtha

Refineries have to continuously explore new opportunities in order to sustain and grow using energy integration of upstream and downstream operations and finding out ways to divert the available feedstock into more marketable and in demand products. There is the opportunity to use the feedstocks to make raw materials which can produce lower cost products like ethylene which is the most widely used monomer in the petrochemical industry. Typically, petrochemical grade naphtha is composed of the lighter fraction of straight run naphtha. The major cause of concern is the stringent compliance of carbon disulphide (CS2) content as it tends to poison the catalyst irreversibly. After analyzing the ways to remove CS2 from PCN by hydrotreating, adsorption and conventional distillation, the use of Dividing wall columns seems to be the most feasible and cost effective option.