Instrumental Analysis and Molecular Structure Analysis of Fouling Deposits Recovered from Distillation Column Reboilers in Ethylene Plants

Fumoto Eri, Kakinuma Toshihiro, Takanohashi Toshimasa

doi:10.1252/kakoronbunshu.49.23

<p>Fouling deposits recovered from depropanizer and debutanizer reboilers in three ethylene plants (A, B, C) were measured by elemental analysis, X-ray diffraction, infrared spectroscopy, pyrolysis, and ¹³C-nuclear magnetic resonance (NMR). The deposits contained organic compounds and ash, which was mainly Fe₃O₄. Elemental analysis indicated that the hydrogen/carbon ratios of the deposits were roughly equal at approximately 1.4 mol/mol, except for samples recovered from the reboiler not fed with high carbon number components and samples containing water. The deposits contained carbonyl functional groups, and the amount of oxygen varied. Molecular structure analysis of organic compounds in the deposits was conducted based on the results of pyrolysis measurement and NMR measurement. The molecular structure of the deposits in depropanizer reboilers in the plant C was estimated as the molecule composed of 1,3-butadiene and isobutene. The ¹³C chemical shift distribution of the molecule estimated by ChemDraw was very close to the distribution of the ¹³C-NMR spectrum. The molecular structure of the deposits in the depropanizer reboilers in the plants A and B was estimated as polymers composed of cycloalkene. The molecular structure of deposits in the debutanizer reboilers in the plants A, B, and C was estimated as cyclopentadiene and polymer containing ketones and carboxylic acids.</p>

Instrumental Analysis and Molecular Structure Analysis of Fouling Deposits Recovered from Distillation Column Reboilers in Ethylene Plants

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