Abstract: Disclosed is an ethylene and/or propylene cracker unit that uses recycled carbon dioxide as a working fluid. A boiler may also use recycled carbon dioxide as a working fluid. In either instance, instead of releasing high-purity CO2 into the atmosphere, the bulk of the CO2 is utilized as the working fluid and the produced CO2 is captured and sent to the pipeline for utilization or storage. These systems will minimize heat loss and achieve essentially zero CO2 emission to the air.

Abstract: Disclosed is a boiler may that uses recycled carbon dioxide as a working fluid. Instead of releasing high-purity CO2 into the atmosphere, the bulk of the CO2 is utilized as the working fluid and the produced CO2 is captured and sent to a pipeline for utilization or storage. These systems will minimize heat loss and achieve essentially zero CO2 emission to the air.

Abstract: Disclosed is an ethylene and/or propylene cracker unit that uses recycled carbon dioxide as a working fluid. A boiler may also use recycled carbon dioxide as a working fluid. In either instance, instead of releasing high-purity CO2 into the atmosphere, the bulk of the CO2 is utilized as the working fluid and the produced CO2 is captured and sent to the pipeline for utilization or storage. These systems will minimize heat loss and achieve essentially zero CO2 emission to the air.

Abstract: In a carbon black production system having a reactor with a combustion zone and a reaction zone, substantial uniformity of the carbon black produced by the reactor is maintained by regulating the flow of fuel to the combustion zone in response to a signal representative of the temperature within the combustion zone. As an alternative to, or in conjunction with, control in response to a signal representative of the combustion zone temperature, the flow of fuel to the combustion zone can be regulated in response to a signal representative of the rate of combustion heat released by the fuel entering the combustion zone.

Abstract: In a fractionation system in which pressure fluctuations within the fractionation vessel can result in alteration of the fractionator product composition, fractionation column pressure is monitored and converted to a temperature requirement signal representative of the temperature required within a preselected portion of the fractionation column in order to provide the desired product constituent distribution. The heat input to the fractionation column is controlled in response to the temperature requirement signal, corrected as necessary by actual analysis of the product. In a preferred embodiment, control of a demethanizer column in a cryogenic natural gas liquids separation process can be practiced advantageously.

Abstract: Polymerization of a monomer, either alone or present in major proportion with one or more comonomers present in minor proportion, is accomplished by controlling the major monomer feed rate in response to a signal representative of the production rate of the polymerization process, unless the major monomer concentration within the reaction zone exceeds a preselected high limit causing the major monomer feed rate to be controlled in response to the concentration of the major monomer within the reaction zone. The flow of recycle diluent to the reaction zone is controlled in response to the concentration of major monomer within the reaction zone unless the solids concentration within the reaction zone exceeds a preselected high limit, in which case the flow of recycle diluent to the reaction zone is controlled in response to the concentration of solids within the reaction zone.

Abstract: In a carbon black production system having a reactor with a combustion zone and a reaction zone, substantial uniformity of the carbon black produced by the reactor is maintained by regulating the flow of fuel to the combustion zone in response to a signal representative of the temperature within the combustion zone. As an alternative to, or in conjunction with, control in response to a signal representative of the combustion zone temperature, the flow of fuel to the combustion zone can be regulated in response to a signal representative of the rate of combustion heat released by the fuel entering the combustion zone.