Delayed Coking Technology


The delayed coking technology for high-acid and high-calcium
crude oil developed by CNPC EastChina Design Institute (CEI)
passed the research achievement appraisal sponsored by CNPC
Sci-Tech Evaluation Center at the end of June 2006.
   The technology developed on the basis of high-acid and
high-calcium feedstock was first used in the 2.0 million t/a
delayed coking unit in the expansion project of Sudan Khartoum
Oil Refining Co., Ltd. It is the first coking unit in the world
that uses the coking process to directly process high-acid and
high-calcium poor-quality crude oil.
   CEI has for the first time in history used the process to take
crude oil directly into coking units. In that case coking units
have dual functions of atmospheric distillation and delayed
coking. Many new technologies are used in the design of coking
units. Not only is the energy consumption reduced, safety is also
ensured and environmental protection requirements are satisfied.
Because of the corrosion caused by naphthenic acid to different
portions of coking units, CEI has selected suitable
anticorrosive materials and optimized process conditions.
Besides, the institute has also developed quite a few new
technologies and for the first time in history used
middle-section recycle oil as quenching oil to reduce oil/gas
coking.