Dehydrogenation of 2-Propanol in Reactive Distillation Column for Chemical Heat Pump.

Advances in Organic Liquid‐Gas Chemical Heat Pumps

“…Based on the fact that the reaction system can absorb huge amounts of reaction heat at a relatively low temperature and has fewer hazards than other reaction systems [15], the isopropanol/acetone/hydrogen CHP has been extensively studied, being a promising representative CHP type [4,7,8,15,[22][23][24][25][26][27]. The endothermic dehydrogenation reaction of liquid isopropanol at about 353 K and 0.1 MPa proceeds with proper catalysts (e.g., Ru/C, Ru-Pt/C, Ru-Pd/C, Raney nickel, etc.)…”

“…The composite Ru-Pt catalyst and its surface modification with Pt(acac) 2 or Pd(acac) 2 exhibited an activity enhancement [41]. With Ru-Pd/C as a catalyst, Gaspillo et al [23] measured the reaction rate of gas-phase isopropanol in a fixed-bed reactor and found that the conversion was limited to 10.8 % at 363 K due to the equilibrium. Subsequently, Doi et al [42] further studied the dehydrogenation reaction of isopropanol when using carbon-supported Ru-Pd as a catalyst.…”

“…In addition, the operation has a very strict requirement for the pressure balance in the system. Later, Gaspillo et al [23] proposed a simpler design by using a reactive distillation column and found that the separation of acetone and 2-propanol was substantially influenced by the feed flow rate, temperature of the heat source, and reflux ratio. The conversion and the molar fraction of acetone in the column could reach 100 % for the selected conditions (less than 0.04 mmol s -1 feed flow rate in their work), and the reaction rate is independent of the mole fraction of acetone in the feed.…”

Multiple Regression Analysis of Catalytic Dehydrogenation of Isopropanol in a Chemical Heat Pump System

“…For this type of storing, the forward reaction undertakes storing heat, and the reverse reaction functions to release the heat whenever is required. Thus, while a CHP is a system that uses a reversible chemical reaction to change the temperature level of thermal energy stored by chemicals significant for absorbing and releasing heat, it is also considered an alternative for thermal energy storage systems 1–11 due to its high energy storage capacity, less heat losses, and long‐term storage of both reactants and products.…”

“…Among the CHP systems that have been proposed and investigated by many researchers 1, 6–8, 21–25, the isopropanol‐acetone‐hydrogen CHP has been proven experimentally to be a promising system 2–5, 25–30. This system is based on the liquid‐phase catalytic endothermic dehydrogenation of isopropanol at 80 °C and gas‐phase catalytic exothermic hydrogenation of acetone at 200 °C (Fig.…”