Process of producing C2 and C3 olefins from hydrocarbons
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United States of America Patent
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Issued Date -
Aug 7, 2003
app pub date -
Dec 16, 2002
filing date -
Jan 12, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The feed hydrocarbon together with steam is passed as vapor through a thermal steam cracking in which it is heated to temperatures in the range from 700 to 1000.degree. C., where a cracking mixture is produced which contains C.sub.2- to C.sub.6-olefins and C.sub.4- to C.sub.6-diolefins. From the cracking mixture a first fraction, which contains C.sub.2- and C.sub.3-olefins, and a second fraction, which contains olefins and diolefins of the range C.sub.4 to C.sub.6, are separated. The diolefins are at least partly removed from the second fraction, and an intermediate product is produced which consists of C.sub.4- to C.sub.6-olefins for at least 30 wt-%. A feed mixture containing C.sub.4- to C.sub.6-olefins and steam is introduced into a reactor with an inlet temperature of 300 to 700.degree. C., which reactor contains a bed of granular, form-selective catalyst, where a product mixture containing C.sub.2- to C.sub.4-olefins is withdrawn from the bed and C.sub.2- and C.sub.3-olefins are separated from the product mixture.
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