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research-article

High Temperature Thermal Decomposition of Diethyl Carbonate by Pool Film Boiling

[+] Author and Article Information
C Thomas Avedisian

Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853-7501, USA
cta2@cornell.edu

Wei-Chih Kuo

Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853-7501, USA
wk253@cornell.edu

Wing Tsang

Physical and Chemical Properties Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
wingtsang2000@yahoo.com

Adam Lowery

Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853-7501, USA
al659@cornell.edu

1Corresponding author.

ASME doi:10.1115/1.4038572 History: Received March 15, 2017; Revised September 19, 2017

Abstract

In this paper we apply a new method based on the film boiling regime of multiphase heat transfer to study pyrolysis of saturated diethyl carbonate (DEC) at temperatures up to 1500K. Detailed measurements are made of the composition of bubbles that percolate through the system which are used to infer the decomposition reactions. The results show that below about 1100K the decomposition products are ethylene (C2H4), carbon dioxide (CO¬2) and ethanol (EtOH, C2H5OH) with the concentration ratio [C2H4]/[CO2] =1 corresponding to a first order decomposition process. At higher temperatures, [C2H4]/[CO2] > 1 which is explained by an additional route to forming C2H4 from decomposition of radicals formed by EtOH. The presence of H2, CO, CH4 and C2H6 in the product stream was noted at all temperatures examined with concentrations that increased from trace values at low temperatures to values comparable to DEC decomposition products at the highest temperatures. The role of EtOH decomposition radicals attacking DEC is also speculated to provide another DEC conversion route at high temperatures. Formation of a carbon layer on the tube was observed but did not appear to influence the decomposition process.

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