Methods and systems for separating C4 crude streams
AssigneeSabic Global Technologies B.V.
InventorsGuillermo Leal, Zeeshan Nawaz, Renaat Hennus, Antonio Matarredona, Faisal Baksh
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Abstract
The present invention provides, among other things, new processes for separating and purifying C4 fractions from a crude C4 stream. Compared to prior methods, the processes of the present invention simplify the C4 separation processes, afford more possible configurations for separation and purification, and are more cost effective. The processes and systems provided herein can be used as part of a cost-effective and efficient method for synthesizing methyl tertiary-butyl ether.
Claims13
A method of producing methyl tertiary-butyl ether, comprising:
- selectively hydrogenating a crude C4 stream to remove acetylinic impurities contained therein;
- distilling the hydrogenated crude C4 stream to remove butadiene impurities contained in the hydrogenated crude C4 stream, forming a distillate stream and a bottoms stream;
- exposing the distillate to a separation unit comprising a solid adsorbent to produce a first product stream comprising 1-butene and a second product stream comprising isobutene;
- reacting the second product stream with a methanol stream to produce methyl tertiary-butyl ether.
A method of producing methyl tertiary-butyl ether, comprising:
- selectively hydrogenating a crude C4 stream to remove acetylinic impurities contained therein;
- distilling the hydrogenated crude C4 stream to remove butadiene impurities contained in the hydrogenated crude C4 stream, thereby forming a distillate stream and a bottoms stream;
- selectively hydrogenating the distillate stream to further reduce the concentration of butadiene impurities to form a first product stream;
- exposing the first product stream to a first separation unit comprising a solid adsorbent to produce a second product stream comprising 1-butene and a third product stream comprising a mixture of isobutene and isobutane;
- exposing the third product stream to a second separation unit comprising a solid adsorbent to produce a fourth product stream comprising a mixture of isobutene and isobutane and a fifth product stream enriched in 2-butenes;
- and
- reacting the fourth product stream with a methanol stream to produce methyl tertiary-butyl ether.
A method of producing methyl tertiary-butyl ether, comprising:
- selectively hydrogenating a crude C4 stream to remove acetylinic impurities contained therein;
- distilling the hydrogenated crude C4 stream to remove butadiene impurities contained in the hydrogenated crude C4 stream, thereby forming a distillate stream and a bottoms stream;
- selectively hydrogenating the distillate stream to further reduce the concentration of butadiene impurities to form a first product stream;
- exposing the first product stream to a first separation unit comprising a solid adsorbent to produce a second product stream comprising 1-butene and a third product stream comprising a mixture of isobutene and isobutane;
- optionally exposing the third product stream to a second separation unit to produce a fourth product stream comprising 2-butene and a fifth product stream comprising isobutene;
- reacting the fifth product stream with a methanol stream to produce methyl tertiary-butyl ether.
Dependencies are inferred from the claim text.