Evolution of the Characteristics of Soot Formed from Liquid Hydrocarbons in an Electric Arc in the Course of the Process

A I Nikolaev,B V Peshnev,A S Filimonov

doi:10.3103/s0361521921060124

Abstract

The results of the study of the evolution of the characteristics of dispersed carbon formed during the decomposition of liquid hydrocarbons in an electric arc are presented. It is shown that with an increase in the degree of decomposition of the raw material (assessed by the gas yield), along with a change in its group composition, the characteristics of soot change - the particle diameters increase and its structure increases, and the soot becomes less reactive. These changes need to be considered when designing the process.

Highlights

As a result of statistical processing of soot samples obtained by the electrocracking of various classes of hydrocarbons and heteroatomic compounds, it was found that, at comparable numbers of carbon atoms in the feedstock, the yield of soot increased in the order alkanes–naphthenes–arenes
In the series of octane–tridecane alkanes, there was a tendency to an increase in the dispersity of soot with the number of carbon atoms in the molecule; the dispersity of soot obtained by the decomposition of C3–C10 alcohols was almost the same, and a decrease in the dispersity of soot from C6–C9 arenes with the molecular weight of the hydrocarbon was noted
Bel’chenko et al [22] reported on the formation of liquid hydrocarbons, differing in structure and molecular weight from the feedstock, in the process of electrocracking using the decomposition of individual hydrocarbons as an example. These results suggested that information on the characteristics of electrocracking soot from various raw materials is like a “snapshot” that does not take into account the evolution of a liquid phase in the course of electrocracking

Summary

Introduction

After the reorientation of petroleum chemistry to ethylene and propylene, interest in electrocracking as a process for the production of acetylene faded away; it was considered as a method for recycling chemical industry wastes and waste oils [5–8]. It can be explained only by a change in the group composition of the raw material, namely, by a decrease in the alkane content and an increase in the concentration of arenes (Table 2).

Results

Conclusion