Discussion
State whether the following is true or false.
Hydrotreating is used chiefly to remove sulphur and nitrogen compounds.
Answer: B
Correct answer: True
Hydrotreating passes the feed with hydrogen over a catalyst so that sulphur leaves as hydrogen sulphide and nitrogen as ammonia. It also saturates olefins and improves stability and colour, but sulphur removal is the driver: fuel specifications now demand ten parts per million or less, and downstream catalysts are poisoned by sulphur, so nearly every stream in a modern refinery is hydrotreated.
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