Cooligomerization of dominant monomers of C9 fraction of liquid pyrolysis products: comparison of heterogeneous catalytic approach with common methods

Abstract

Cooligomerization of liquid products of the C9 fraction of diesel fuel pyrolysis to produce cooligomers of wide application is suggested to be carried out with silica-alumina catalysts, among which the activated bentonite clay seems to be optimal. Cooligomerization of the mixture simulating the C9 fraction composition was studied to compare the suggested heterogeneous catalytic method with other methods of cooligomers production. Different methods have been compared in terms of yield of cooligomers and their properties, namely molecular weight and its distribution, density, unsaturation and colour. The ratio of monomer units in cooligomer has been determined and the monomers conversion degrees have been calculated for different cooligomerization methods. Reasons of structure and composition differences of cooligomers obtained by different methods are suggested.

Research into epoxidation process of the С9 fraction hydrocarbons and unsaturated co-oligomers by peroxyethanoic acid

“…Properties of co-oligomers, obtained by homogeneous-, heterogeneous catalytic, initiated, and thermal co-oligomerization of hydrocarbons of the С 9 fraction [2], are given in Table 1.…”

“…First, this enables solving environmental problems related to the disposal waste from petrochemical production. Second, the need of chemical industry for synthetic substitutes for the products of natural origin is met at the same time [1,2]. Third, the products of co-oligomerization of unsaturated hydro-carbons from the fractions of LPB (petroleum polymer resins) are the co-oligomers that contain the excessive unsaturated bonds [2,4].…”

“…Of special attention in the industry of organic synthesis are the co-oligomers with epoxy groups. The raw material for obtaining epoxides is the individual olefins of different structure and mixture [1][2][3].…”

“…Thus, by increasing the capacity of pyrolysis plants, it is annually produced in the world about 45-50 million tons of LPB. It is obvious that the proper utilization is an important issue [2,4].…”

“…Pyrocondensate is separated into individual fractions that have a narrower boiling temperature interval: fraction С 5 (303-343 K), fraction С 6 -С 7 (343-403 K), fraction С 8 (403-423 K), fraction С 8 -С 9 (403-473 K), and fraction С 9 (423-473 K). Obtaining synthetic co-oligomers, known as petroleum polymer resins (PPR), is the rational method for using pyrolysis fractions [2,4].…”