Piperylene, Molecular sieves
Piperylene concentrate is a complex mixture of 5-carbon unsaturates. The major components are trans-1,3-pentadiene and cyclopentene. The object of this work is to form a product high in cyclopentene and a product high in the pentadienes, through the use of 13X zeolite molecular sives. Separation by molecular sieves is difficult because of the tendency of trans and cis pentadience to polymerize o the sieve and to thus decrease the adsorptive capacity of the sieve. Nitrogenous bases (dimethylamine, pyridine, and piperidine) were used in an attempt to neutralize any acid sites on the sieve. Dealumination by EDTA was used to decrease the number of electron deficient aluminum cations. cation exchange with iron, copper, potassium, and barium were used in an attempt to decrease polymerization. Silylation, esterification, and methylation were attempted to decrease the number of polymerization sites. The degree of polymerization inhibition achieved by the different treatment procedures was determined by a comparison of adsorptive capacity (g adsorbate/g sieve) and by percent desorption ((g recovered adsorbate/g adsorbate) X 100). The copper exchanged 13X sieve showed very high initial adsorptive capacity at 0.42 g adsorbate/g sieve and the highest percent desorption at nearly 100% for the first two runs. The methylated and silylated 13X sieves showed high adsorptive capacity but low percent desorption.
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Clausen, Chris A.
Master of Science (M.S.)
College of Natural Sciences
Length of Campus-only Access
Masters Thesis (Open Access)
Maller, Samuel G., "Separation of 1,3-Pentadiene from a Five-Carbon Olefin Mixture by Use of 13x Molecular Sieves" (1980). Retrospective Theses and Dissertations. 501.