Abstract
This chapter discusses an application of the chemical heat pump. Chemical heat pumps use the absorption and emission of heat that accompanies chemical reactions to increase the temperature. When a newly developed 2-propanol/acetone/drogen system is used as an operating medium, the heat pump can provide 200°C heat using an 80°C heat source and a 30°C coolant. A catalyst plays a key role. The heat pump consists of a vapor-phase exothermic reactor, RH; a liquid-phase endothermic reactor, R L; a distillation tower, D; and a heat exchanger, E. The liquid-phase reactor acts as a reboiler for the distillation tower as well. To increase the thermal efficiency of the present heat pump, it is desirable to keep the concentration of acetone in the liquid phase 2- propanol dehydrogenation stage at as high level as possible. This reduces the thermal load in the distillation separation and lowers the boiling point of the solution. This is the most critical requirement for the catalyst used in the low temperature endothermic reaction. The elements of the chemical heat pump technology described in this chapter are basically similar to those of traditional chemical engineering processes. A superior catalyst was required, where an improved catalyst upgraded the system as a whole.
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