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Process Control Case Histories by Gregory K. McMillan

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Direct Temperature Rate Control Improves Reactor Yield

Exothermic batch processing applications may offer opportunities to optimize yield and other performance characteristics by exercising direct control over the rate of temperature change. Why? Reaction rate generally increases with temperature. Raising the rate of temperature change allows more of the internally generated heat to go back into driving the reaction instead of being removed by coolant. A limit is necessary, however, to avoid loss of control and a runaway reaction. This could occur because above some maximum rate, the positive feedback time constant of the reaction approaches the negative feedback time constant of the heat removal system. The lower allowable proportional band ...

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