Keywords

Hydrocarbons, Molecular sieves

Abstract

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.

Notes

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Graduation Date

Winter 1979

Advisor

Clausen, Chris A., 1940-

Degree

Master of Science (M.S.)

College

College of Natural Sciences

Degree Program

Industrial Chemistry

Format

PDF

Pages

vii, 58 pages

Language

English

Rights

Public Domain

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0013222

Subjects

Hydrocarbons, Molecular sieves

Contributor (Linked data)

Clausen, Chris A., 1940-

Collection (Linked data)

Retrospective Theses and Dissertations

Included in

Chemistry Commons

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