Saudi Arabian Oil Company

Nayif A Rasheedi

Ahmad D Hammad

Zaki Yusuf

Bandar A Fadhel

Stamatios Souentie

Abdul Rahman Zafer Akhras

Amjaad Al-Qahtani

A process and system for improving the efficiency of regenerating a CO-rich liquid absorbent stream following contact in an absorption zone with, e.g., a flue gas stream from which it has absorbed CO, and recovering a substantially pure stream of includes passing the pressurized liquid sorbent through a heating zone to heat it to the desorption temperature, e.g., to about 80&#xb0;-85&#xb0; C. for aqueous KCOsorbent, introducing the heated liquid sorbent into a cyclone separation zone where the combination of increased temperature, reduced pressure and the centrifugal forces on the liquid/gas mixture result in a relatively more rapid and efficient separation of the COfrom the liquid sorbent from which it has been released. The CO-lean liquid sorbent descends to the bottom of the cyclone separator and is recovered, cooled and recycled to the absorption zone; the COwithdrawn from the cyclone separation zone passes through a condenser to remove moisture and any other condensates present, and the COis recovered for storage or use in downstream processes.

Cyclone separation and recovery of carbon dioxide from heated liquid absorbent

Methods for recovering organic heteroatom compounds from a hydrocarbon feedstock include feeding into a contactor a hydrocarbon feedstock and an aqueous solvent to form an extraction mixture of the aqueous solvent with the hydrocarbon feedstock. The hydrocarbon feedstock includes a hydrocarbon and an organic heteroatom compound. The aqueous solvent includes an ionic liquid formed from pressurized carbon dioxide and water. A pressure and temperature of the extraction mixture may be established that together tune the aqueous solvent to selectively form a solvent complex with the at least one organic heteroatom compound. Then, the solvent complex is extracted to a recovery vessel from the extraction mixture in the contactor. By adjustment of a recovery temperature of the recovery vessel, a recovery pressure of the recovery vessel, or both, the solvent complex decomposes into carbon dioxide and the organic heteroatom compound. The organic heteroatom compound is then recovered from the recovery vessel.

Methods for recovering organic heteroatom compounds from hydrocarbon feedstocks

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Dhahran, Saudi Arabia

Nayif A Rasheedi