A dividing wall column or a pair of conventional columns can be used to separate an unstabilized naphtha stream to produce an aromatics-free light naphtha stream as a feed for a catalytic cracking unit for olefins production.

A process for steam cracking a hydrocarbon feedstock in a hydrocarbon cracking furnace is disclosed. The hydrocarbon feedstock is preheated in a preheating process module that is integrated with a coke handling system for supply of coke required for combustion. The coke is combusted in presence of oxygen containing gas to heat the heat carrier particles. The heat carrier particles contact the hydrocarbon feedstock to generate preheated hydrocarbon vapors. The flue gas generated by combustion of the coke is contacted with steam in an upper section of the heat source vessel to form dilution steam which mixes with the preheated hydrocarbon vapors to create a mixed stream The mixed stream is fed to the hydrocarbon cracking furnace for thermal cracking.

A process for synthesising hydrocarbons is described comprising the steps of (a) making a synthesis gas comprising hydrogen, carbon monoxide and carbon dioxide from a feedstock in a synthesis gas generation unit, (b) removing carbon dioxide to produce a carbon dioxide stream and purified synthesis gas comprising hydrogen and carbon monoxide for synthesis in a Fischer-Tropsch hydrocarbon synthesis unit wherein (i) at least a portion of the FT water stream is fed to an electrolysis unit to provide an oxygen stream, which is fed to the synthesis gas generation unit. Carbon dioxide stream recovered from the carbon dioxide removal unit and a portion of the hydrogen stream produced by the electrolysis unit are fed to a reverse water-gas shift unit to produce a carbon monoxide stream, with carbon monoxide stream from the reverse water-gas shift unit is fed to the Fischer-Tropsch hydrocarbon synthesis unit.

A gas plant hydrocarbon recovery management system includes a hydrocarbon blowdown header flowline for receiving a hydrocarbon drainage composition, a recovery flowline extending from the header flowline to receive a portion of the composition, a three-phase gravity separator in fluid communication with the recovery flowline via a first flowline, and a hydrocarbon recovery vessel in fluid communication via a second flowline. A three-way control valve is arranged in the recovery flowline and actuatable between a first operational state, where the portion of the composition is entirely diverted through the first flowline and to the three-phase gravity separator, and a second operational state, where some of the portion of the composition is diverted also to the second flowline and to the hydrocarbon recovery vessel. The valve is actuated from the first to the second operational state when a flow rate through the first flowline reaches a predetermined maximum flow rate.