Coking products contain large amounts of olefins, which mainly originate from atmospheric residue oil. What’s wrong with this sentence?
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Coking products contain large amounts of olefins, which mainly originate from atmospheric residue oil. What’s wrong with this sentence?
It makes some senseless sense – coking doesn’t use ordinary slag as raw material, and there are no olefins in ordinary slag either
Coking is carried out by reducing slag, rather than directly coking normal slag. Direct coking of normal slag is a huge waste.
The poster’s statement contains two errors: 1. Coking products contain large amounts of unsaturated hydrocarbons rather than just alkenes. The main reason for this is that the raw materials undergo thermal cracking at high temperatures, resulting in the formation of large quantities of unsaturated hydrocarbons; as a consequence, the stability of coking products is very poor, and hydrogenation refining is required. 2. Regular residue is rarely used as raw material for coking; the regular residue from most crude oils is an excellent catalyst material, and using it for coking represents a waste. At present, in China, only the heavy crude oil from Tahe in Xinjiang appears to use a processing method that involves atmospheric pressure distillation before being sent to coking.
Both atmospheric and vacuum residue do not contain olefins