03373nas|a2200241 i 450000500170000000800410001703500150005810000240007324500710009726000520016830000150022049000270023550001540026250200570041652023380047365000150281170000360282670000520286270000470291471000460296181000590300785600650306620260817162303.0290200s1999    th uu m rtt  00|  a1eng d  a.b117776550 aWalaiporn Mooksuwan10aAnalysis of a hydrogenation/dehydrogenation system to upgrade heat  aBangkok :bAsian Institute of Technology,c1999  a116 leaves1 aThesis ;vno. ET-99-35  aA thesis submitted in partial fulfillment of the requirements for the degree of  Master of Science, School of Environment, Resources and Development   aThesis (M.Sc.) - Asian Institute of Technology, 1999  aLow-temperature thermal energy can be upgraded to a higher temperature thermal  energy by using a heat pump. Among the heat pumps proposed, a 2- Propanol/ Acetone/Hydrogen chemical heat pump is a promising one. This research was aimed  to study experimentally the performance of this system using a catalyst that has not been  studied earlier.  Model for estimating the reaction conversion and theoretical heat energy associated  with the reaction has been developed. The results of the simulation have been compared with  the literature and the experimental studies.  Experiments on 2-propanol dehydrogenation were conducted between the temperature  range of 60 °C to 80 °C with a 10 wt% Ru-Pt/ activated C suspended in liquid 2-propanol to  study the influences of reaction temperature, catalyst concentration and acetone concentration  in liquid reactant on the performance of 2-propanol dehydrogenation. The maximum initial  reaction rate 54 mmole/h-g was obtained at reaction temperature 75°C to 80°C with 400 mg  catalyst suspended in 300 ml of 2-propanol (1.3 g/l). The maximum heat utilization of 4.5 %  was obtained when oil bath temperature was 100°C and 1.3 g/l of catalyst concentration. This  is, however, low when compared to the heat utilization factor of a falling film reactor.  Experiments on acetone hydrogenation were conducted at the catalyst bed temperature  range of 110 °C to 150 °C with 10 wt% Ni-Cu/y-Ah03 suspended the U-tube reactor to find  the influences of reaction temperature, catalyst weight and flow rate of hydrogen and acetone  on the performance of this reaction. The maximum acetone conversion of 25% was obtained at  inlet temperature of 120°C with 0.5651 gm catalyst (the catalyst bed temperature of 150 °C)  and hydrogen and acetone flow rate of 0.0153 mole/min and 0.0025 mole/min. For different  catalyst bed temperature, the conversion of acetone obtained at hydrogen-acetone (H/A) mole  ratio of 4 to 10 seems to be constant, but it tends to decrease at higher H/ A mole ratio (more  than 9).  A study of a combined hydrogenation - dehydrogenation system has been done based  on data obtained from the experimental studies and the heat released at the exothermic reactor  for various inlet (endothermic) conditions, the influence of catalyst quantities, etc have been  studied.  0aHeat pumps1 aKumar, Sivanappan,eChairperson0 aSurapong Chiraratananon,eExamination Committee1 aPham, Hoang Luong, eExamination committee2 aGovernment of France, eScholarship donor2 aAsian Institute of Technology.tThesis ;vno. ET-99-35  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B12033