The principle of coking
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I have a question for those familiar with coking: What are the reaction principles involved in coking during petroleum refining, and what specific reactions take place?
Catalytic cracking and condensation reactions: Heavy oils (such as heavy oil, vacuum residue, cracked residue, and even tar pitch) undergo catalytic cracking and condensation reactions under high temperatures, resulting in the production of gases, gasoline, light diesel, light wax oil, heavy wax oil, and petroleum coke.
Thermal pyrolysis produces small molecular compounds, which then undergo condensation and coking
This post was last edited by zenghay on 2010-6-11 at 15:25; it mainly involves cleavage and condensation reactions. Generally, large molecular hydrocarbons break down to form smaller hydrocarbons, and the active molecules resulting from these chain breaks then condense to form larger molecules. Cleavage is endothermic, while condensation is exothermic.
Reply to 3# 8133032: What is the principle and process of the condensation reaction?
The principle is based on high school organic chemistry; the process involves the condensation of small molecules to form larger molecules. It’s a bit like the process for polypropylene. You can take a look at the book on coking processes and engineering; it’s extremely detailed.
Alkanes are primarily cracked into alkenes and other alkanes. Cycloalkanes undergo breaks in their alkyl side chains as well as in their ring structures, resulting in the formation of alkenes and alkanes. Aromatic hydrocarbons undergo dehydrogenation reactions until coke is produced
The specific reaction mechanism has not yet been identified, as the reaction process of residue in the coke tower is complex; currently, cracking and condensation are the processes that are considered
It mainly involves cracking and condensation. The current mainstream approach is delayed coking, which means coking takes place not in a heating furnace but in a coking tower; hence it is called delayed coking