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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

THE EFFECT OF VARIOUS SULFUR COMPOUNDS ON CHEMICAL REACTION FOULING UNDER LOCAL BOILING CONDITIONS

Get access (open in a dialog) DOI: 10.1615/IHTC10.1400
pages 527-532

Sinopsis

The fouling of styrene dissolved in n-heptane was studied under subcooled boiling conditions. Test conditions were: styrene concentration -1 wt %: (O2 absent), 3 wt %: (O2 present); velocity - 0.9 m/s ; heater surface temperature - 180-200 C; bulk temperature - 99 C. The sulfur compounds were added at 10, 100 and 1,000 mg/1 sulfur with respect to styrene.
The oxygen-free tests were conducted using methyl phenyl sulfide at 10, 100 and 1000 mg/1 sulfur and n-dodecanethiol at 1000 mgA sulfur with surface temperature 180 to 200 C. No fouling occurred with n-dodecanethiol. Methyl phenyl sulfide showed a much lower inhibitory effect. Higher fouling occurred with the sulfur-free solution.
The tests with oxygen present were conducted using six different sulfur compounds at 100 mg/1 sulfur. The n-dodecanethiol was also investigated at 10 mg/1. At surface temperatures of 190 C and 196 C, all sulfur compounds except diphenyl sulfide showed less fouling than the sulfur-free solution. At a surface temperature of 196 C the diphenyl sulfide showed the same fouling as the sulfur-free solution. At either surface temperature, n-dodecanethiol and thiophenyl showed virtually no fouling. At a surface temperature of 196 C, increasing severity of overall fouling occurred.
The results obtained showed that, in general, the fouling process was hindered by the presence of all of the sulfur compounds. This hindering effect was more pronounced with the thiols than with the other compounds. Higher sulfur levels induced less fouling. The various results are discussed from a general chemistry point of view.