delayed coking process
A thermal process which increases the molecular aggregation or @[email protected] in petroleum-based residues or @[email protected] leading to extended @[email protected] domains. This is achieved by holding them at an elevated temperature (usually \(750-765\ \text{K}\)) over a period of time (\(12\ \text{to}\ 36\ \text{h}\)). It is performed in a @[email protected] drum and is designed to ultimately produce @[email protected] The feed is rapidly pre-heated in a tubular furnace to about \(760\ \text{K}\).
@[email protected] is the premium product of the delayed @[email protected] process. It is generally produced from highly aromatic residues from, for instance, the steam @[email protected] of gas oil. Its appearance and preferred orientation of the @[email protected] is a consequence of the evolved gaseous products percolating through the @[email protected] which must not have too high a @[email protected] A close control of temperature, time and feedstock is essential. Lower grades, for instance @[email protected] cokes, are used for @[email protected] applied, for example, in the production of aluminium.
PAC, 1995, 67, 473. (Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)) on page 486 [Terms] [Paper]