The feasibility of separating piperylene (1,3-pentadiene) from a mixture of five-carbon olefins and diolefins with Linde 5A Molecular Sieves was investigated. Olefins and especially diolefins are very reactive and tend to polymerize on the highly polar adsorptive surface thereby clogging the pores of themolecular sieve. It is believed that the acid sites within the zeolite cages catalyze this polymerization reaction and that poisoning of these sites by adsorption of a nitrogenous base (ethylenediamine, dimethylamine or ammonia) or hydrogen sulfide inhibits the formation of polymers. Two criteria were used in the evaluation of the polymerization inhibitors tested. First, a series of consecutive runs (adsorption, purge, and desorption cycle) were made with the pretreated molecular sieves. The adsorption capacity (grams adsorbate/grams of molecular sieve) and percent desorption of adsorbate (grams desorbed adsorbate/grams adsorbate) were plotted to determine the relative amount of polymer buildup on the molecular sieve with the various candidate polymerization inhibitors. Secondly, the desorbed adsorbate (product) collected from a cold trap during the desorption step was analyzed by gas chromatography and the product quality, with respect to 1,3-pentadiene, was determined. Dimethylamine was found to be the best polymerization inhibitor of those tested when evaluated in this manner.
| Identifer | oai:union.ndltd.org:ucf.edu/oai:stars.library.ucf.edu:rtd-1443 |
| Date | 01 January 1979 |
| Creators | Schwinn, Steven R. |
| Publisher | University of Central Florida |
| Source Sets | University of Central Florida |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | Retrospective Theses and Dissertations |
| Rights | Public Domain |
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