Abstract: A method for controlling the operation of a liquefied natural gas (LNG) process which utilizes gas turbine-driven refrigeration compressors is disclosed. A feedforward control system compensates for the effects of changes in ambient air temperature on the plant operating efficiency by periodically predicting a new temperature and resetting the set points of key feedback controllers in anticipation of this new temperature, thereby optimizing the operation of the plant and minimizing the specific fuel consumption at a given LNG production rate.

Abstract: An adiabatic-isothermal swing absorption process is disclosed for the removal of essentially all oxygen contained in an inert gas stream. The oxygen is absorbed from an inert gas stream adiabatically on to a dioxygen absorbent and then desorbed from the absorbent isothermally by the use of external heat. The process method utilizes at least two switching beds of the dioxygen absorbent in which one bed is in an absorbing mode while the other bed is in a desorbing mode.

Abstract: An adiabatic pressure swing absorption process is disclosed for the removal of essentially all oxygen contained in an inert gas stream in minor amounts. The oxygen is absorbed and desorbed adiabatically from a dioxygen sorbent. Optionally, an inert purge gas can be utilized to improve the desorption of oxygen from the dioxygen sorbent. The process utilizes at least two switching beds of the dioxygen sorbent in which one bed is in an absorbing mode while the other bed is in a desorbing mode.