Abstract: A mobile processing system is disclosed for the removal of radioactive contaminants from nuclear process wastewater. The system is fully scalable, modular, and portable allowing the system to be fully customizable according to site-specific remediation requirements. It is designed to be both transported and operated from standard sized intermodal containers or custom designed enclosures for increased mobility between sites and on-site, further increasing the speed and ease with which the system may be deployed. Additionally, the system is completely modular wherein the various modules perform different forms or stages of wastewater remediation and may be connected in parallel and/or in series. Depending on the needs of the site, one or more different processes may be used. In some embodiments, one or more of the same modules may be used in the same operation.

Abstract: In a fractional distillation column wherein a split-range controller alternately manipulates a valve for flaring gas to decrease pressure and a valve for importing gas to increase pressure as required to maintain a desired distillation pressure, both flare gas and import gas are minimized by providing a valve position controller that slowly drives both of the control valves manipulated by the split-range controller toward a closed position while maintaining the desired distillation pressure.

Abstract: A desired unreacted monomer concentration is maintained in the reaction effluent removed from a polymerization reactor by manipulating the catalyst feed rate to the polymerization reactor.

Abstract: The temperature of a crude oil provided from a crude oil preheat furnace to a crude tower is substantially minimized by controlling such temperature so as to maintain a desired minimum overflash flow in the crude tower. Also, the temperature of each of the individual coils in the preheat furnace are balanced with respect to each other. Such minimization and balancing results in substantially optimal utilization of the fuel provided to the preheat furnace which results in considerable economic savings with respect to the operation of the preheat furnace.

Abstract: A desired unreacted monomer concentration is maintained in the reaction effluent removed from a polymerization reactor by manipulating the catalyst feed rate to the polymerization reactor.

Abstract: A control system for a fractional distillation column in which a pumparound stream is used to remove heat from the fractional distillation column is disclosed. A combination of feedforward and feedback control is utilized to control the heat removal by the pumparound stream in such a manner that smoother operation of the fractional distillation column will be accomplished and a closer approach to required product specifications will be approached.

Abstract: A control system for a fractional distillation column in which a pumparound stream is used to remove heat from the fractional distillation column is disclosed. A combination of feedforward and feedback control is utilized to control the heat removal by the pumparound stream in such a manner that smoother operation of the fractional distillation column will be accomplished and a closer approach to required product specifications will be approached.

Abstract: A fluid catalytic cracking unit is controlled by sensing the reactor bed temperature and the riser temperature and by manipulating the flow of regenerated cracking catalyst into the riser responsive to these two temperature measurements. A gain function generator is utilized to compensate for the non-linear relationship between the change in valve position and change in riser temperature caused thereby.