Preferred Label : delayed coking process;
IUPAC definition : A thermal process which increases the molecular aggregation or association in petroleum-based
residues or coal tar pitches leading to extended mesophase domains. This is achieved
by holding them at an elevated temperature (usually 750-765 K) over a period of time
(12-36 h). It is performed in a coking drum and is designed to ultimately produce
delayed coke. The feed is rapidly pre-heated in a tubular furnace to about 760 K.;
Scope note : needle coke is the premium product of the delayed coking process. it is generally
produced from highly aromatic residues from, for instance, the steam cracking of gas
oil. its appearance and preferred orientation of the graphene layers is a consequence
of the evolved gaseous products percolating through the mesophase which must not have
too high a viscosity. a close control of temperature, time and feedstock is essential.
lower grades, for instance isotropic cokes, are used for carbon electrodes applied,
for example, in the production of aluminium.;
Origin ID : D01578;
See also
A thermal process which increases the molecular aggregation or association in petroleum-based
residues or coal tar pitches leading to extended mesophase domains. This is achieved
by holding them at an elevated temperature (usually 750-765 K) over a period of time
(12-36 h). It is performed in a coking drum and is designed to ultimately produce
delayed coke. The feed is rapidly pre-heated in a tubular furnace to about 760 K.
