Aqueous Vapour Substitution For Hydrogen In
The Process Of Pyrolysis
Author(s)
M. Demidenko, R. Magaril & Е. Magaril
Abstract
In order to decrease hydrocarbons fractional pressure in the process of ethylene
pyrolysis, 0.5–1.5 kilograms of aqueous vapour is added to each kilo of
feedstock. In the pyrolysis of hydrocarbon feed, a considerable part of the
process’ power consumption is connected with water vaporization; heating up of
the diluent to 800°С and more with the subsequent condensation.
The aim of this work is to reduce specific energy consumption and improve
selectivity to ethylene of pyrolysis process.
The same hydrocarbons fractional pressure can be created as during diluting
by aqueous vapour if we use hydrogen as a diluent with its mass 9 times less.
It was found that if hydrogen is purged to the furnace inlet under different
feedstock temperatures prior to the pyrolitic reaction, hydrogen will become a
homogeneous catalyst for the subsequent radical-chain reactions. The depth of
the reaction (according to Korzun and Magaril in Thermal processes of refining
2008) will be greater, under otherwise equal conditions, than without hydrogen.
Specific heat energy consumption for the production of ethylene, as well as
for the amount of ethylene and propylene, with aqueous vapour substitution to
hydrogen decreases. When replacing the vapour for a considerably smaller
amount of hydrogen, the latter is involved in a radical chain process, providing
greater selectivity for ethylene production, thereby increasing the yield of
ethylene at 15% relative. As a result, ethylene production costs are significantly
reduced.
Keywords: pyrolysis, homogeneous catalysis, process selectivity, energy cost
reduction, ethylene.
Keywords
pyrolysis, homogeneous catalysis, process selectivity, energy costreduction, ethylene.
Related Book
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