Characteristics of Chemical Heat Pump through Kinetic Analysis of Paraldehyde Depolymerization

Haruo Kawasaki, Atsushi Kanzawa, Takayuki Watanabe

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Abstract

The paraldehyde/acetaldehyde (Pa/A) chemical heat pump is used as a cooling system. The present study investigates depolymerization of paraldehyde for a chemical heat pump cycle. The depolymerization rate of paraldehyde was measured in a range from 286 K to 303 K on an acid resin catalyst (Amberlyst 15E). The rate determining step of the depolymerization is the paraldehyde ring-opening step on the cataly t. The depolymerization rate equation on the solid catalyst is described by the Langmuir-Hinshelwood kinetic model. The cooling rate of the Pa/A system at 286 K is estimated from the reaction rate equation. The cooling rate is 10 kW per unit catalyst-weight and higher than other CHPs. The coefficient of performance of the Pa/A system is 6.3.

Original languageEnglish
Pages (from-to)374-380
Number of pages7
JournalJournal of Chemical Engineering of Japan
Volume31
Issue number3
DOIs
Publication statusPublished - Jan 1 1998
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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