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Study of the regeneration of K2CO3·1.5H2O from KHCO3 via a temperature and water vapour pressure swing

Olk, Christopher (2015) Study of the regeneration of K2CO3·1.5H2O from KHCO3 via a temperature and water vapour pressure swing.

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Abstract:This work analyses the impact of varying water vapour pressure and temperature on the yield of regeneration of K2CO3∙1.5H2O (potassium carbonate sesquihydrate) from KHCO3 via the chemical reaction 2KHCO3 + 0.5H2O(g) ↔ K2CO3∙1.5H2O(s) + CO2(g). Two different approaches were used in experimental series. One was a test series where the water vapour pressure in the inflowing gas stream was kept stable and the reactor temperature was varied. In a second series, the reactor temperature was kept stable and the water vapour pressure in the inflowing gas stream was varied. The apparent activation energy Ea was determined to be in the range of -50kJ/mole. This is in line with the observation that an increase in temperature lowers the speed of reaction and the total amount of CO2 desorbed in a given time frame. The value of Ea is subject to uncertainty due to equipment inaccuracies. An increase in water vapour pressure caused the reaction rate to increase. The proportionality is higher than the stoichiometric coefficient 0.5. It was furthermore shown that kdes(T), the apparent desorption kinetic constant, depends linearly on the amount of KHCO3 available. The reaction rate could be described by
Item Type:Essay (Bachelor)
Faculty:TNW: Science and Technology
Subject:50 technical science in general
Programme:Advanced Technology BSc (50002)
Link to this item:http://purl.utwente.nl/essays/68161
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