How to separate isobutylene from C4 gases, and how to separate n-butylene?
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Dear teachers: For the C4 gas produced in the refinery, after butadiene is extracted and separated, how can isobutylene and n-butylene be separated from the remaining C4 gas? I would like to ask the teachers.
Apart from the MTBE unit consuming isobutylene, which patent holder has the better technology for converting butene-2 to butene-1?
Isobutylene can be cracked using MTBE, or it can be converted to tert-butanol and then decomposed; alternatively, reaction distillation followed by extraction can be used to obtain isobutylene – there are many methods available
The separation of n-butene is relatively difficult; generally, when its concentration is not high, methanol is used first to etherify isobutene, and the remaining butene is then sent to units for dealkylation, aromatization, etc
Compared to ordinary distillation methods, extraction requires more energy
First, use the MTBE unit, then add hydrogen to remove trace amounts of butadiene, and finally distill to obtain butylene-1.
This requires the use of a solvent to alter their relative volatilities in order to achieve separation, as their boiling points are too similar