Paraffin dehydrogenation process and apparatus
AssigneeUop LLC
InventorAdam J Kanyuh
Life of this patent
Estimating the term…
Abstract
A process for recovering hydrogen from dehydrogenation reactor effluent is disclosed. A feed stream comprising hydrocarbons and hydrogen to a dehydrogenation reactor maintained at dehydrogenation conditions to provide a dehydrogenation reactor effluent. The dehydrogenation reactor effluent is passed to a cold box separation unit to provide a liquid hydrocarbon product stream and a recycle hydrogen stream. A return portion of the recycle hydrogen stream is passed to the reactor effluent compressor. The subject matter disclosed improved process and apparatus which enables the paraffin dehydrogenation reactor to run at reduced H2/HC ratio without requiring an investment in a resized compressor or resized turboexpanders or separators in the cold box.
Claims19
A process for recovering hydrogen from dehydrogenation reactor effluent, the process comprising:
- passing a feed stream comprising hydrocarbons and hydrogen to a dehydrogenation reactor maintained at dehydrogenation conditions to provide a dehydrogenation reactor effluent;
- passing the dehydrogenation reactor effluent to a reactor effluent compressor to provide a compressed hydrocarbon stream;
- passing the compressed hydrocarbon stream to a cold box separation unit to provide a liquid hydrocarbon product stream and a recycle hydrogen stream;
- splitting the recycle hydrogen stream upstream of a cold combined feed exchanger located in the separation unit;
- and
- passing a return portion of the recycle hydrogen stream to the reactor effluent compressor.
A process for recovering hydrogen from dehydrogenation reactor effluent, the process comprising:
- passing a feed stream comprising hydrocarbons and hydrogen to a dehydrogenation reactor maintained at dehydrogenation conditions to provide a dehydrogenation reactor effluent;
- passing the dehydrogenation reactor effluent to a reactor effluent compressor to provide a compressed hydrocarbon stream;
- passing the compressed hydrocarbon stream to a cold box separation unit to provide a liquid hydrocarbon product stream and a recycle hydrogen stream;
- splitting the recycle hydrogen stream upstream of a cold combined feed exchanger located in the separation unit;
- and
- mixing a return portion of the recycle hydrogen stream with the dehydrogenation reactor effluent to provide an enriched stream and passing the enriched stream to the reactor effluent compressor.
An apparatus for recovering hydrogen from dehydrogenation reactor effluent comprising:
- a dehydrogenation reactor operating under dehydrogenation conditions configured to selectively dehydrogenate a feed stream comprising hydrocarbons and hydrogen and provide a dehydrogenation reactor effluent;
- a reactor effluent compressor in fluid communication with the dehydrogenation reactor via the dehydrogenation reactor effluent and configured to compress the dehydrogenation reactor effluent to provide a compressed hydrocarbon stream;
- a cold box separation unit comprising of a cold combined feed exchanger in fluid communication with the reactor effluent compressor via the compressed hydrocarbon stream and configured to provide a liquid hydrocarbon product stream and a recycle hydrogen stream;
- a split is present upstream of the cold combined feed exchanger to divide the recycle hydrogen stream;
- and
- the reactor effluent compressor is in fluid communication with the cold box separation unit via a return portion of the recycle hydrogen stream.
Dependencies are inferred from the claim text.