Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Entire DC Network
The Separation Of Piperylene Concentrate By Extractive Distillation, Mary Jane Curnutte
The Separation Of Piperylene Concentrate By Extractive Distillation, Mary Jane Curnutte
Retrospective Theses and Dissertations
Piperylene concentrate, the five-carbon olefin and diolefin by-product of ethylene production, is being produced in increasing quantities as liquid feedstocks become more prevalent. At present, the concentrate is used primarily in resin production for the adhesives industry. Since this use is economically unattractive, a separation of the concentrate into pure compounds is industrially desirable. The evaluation of the effectiveness of several solvents for extractive distillation of piperylene concentrate was performed. This study resulted in the selection of acetonitrile as the most effective and most economical solvent investigated. Various distillation conditions were studied and optimization was based on these results.
Separation Of 1,3-Pentadiene From A Five-Carbon Olefin Mixture By Use Of 13x Molecular Sieves, Samuel G. Maller
Separation Of 1,3-Pentadiene From A Five-Carbon Olefin Mixture By Use Of 13x Molecular Sieves, Samuel G. Maller
Retrospective Theses and Dissertations
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 …
Cyclodimerization Of 1,3-Pentadiene With Homogeneous Nickel Catalyst, Morteza Soltani
Cyclodimerization Of 1,3-Pentadiene With Homogeneous Nickel Catalyst, Morteza Soltani
Retrospective Theses and Dissertations
Piperylene concentrate is a complex mixture of 5-carbon unsaturated hydrocarbons obtained as by-products when naptha or gas oils are cracked. The major component in this mixture is 1,3-pentadiene. The cyclodimerization of 1,3-pentadience in piperylene concentrate by using a nickel catalyst was studied. Various types of ligands were used in the preparation of the nickel catalyst. The effect of each ligand on activity of the catalyst in dimerization of diene, on conversion, and on yield of reaction were investigated. The effect of reaction conditions, such as temperature, pressure, and reaction time, on conversion of monomer, yield of dimer, and selectivity of …