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US 9,040,763 B2Granted
Method for quenching paraffin dehydrogenation reaction in counter-current reactor
AssigneeUop LLC
InventorsWolfgang A. Spieker, Laura E. Leonard, David N. Myers
Life of this patent
Estimating the term…
Abstract
A process is presented for quenching a process stream in a paraffin dehydrogenation process. The process comprises cooling a propane dehydrogenation stream during the hot residence time after the process stream leaves the catalytic bed reactor section. The process includes cooling and compressing the product stream, taking a portion of the product stream and passing the portion of the product stream to the mix with the process stream as it leaves the catalytic bed reactor section.
Claims18
A process for controlling temperatures in a dehydrogenation reactor, comprising:
- passing a catalyst to a dehydrogenation reactor, such that the catalyst flows down through the reactor;
- passing a paraffin rich stream to the dehydrogenation reactor such that the paraffin rich stream flows up through the reactor and through a catalyst bed, thereby creating a process stream comprising catalyst and dehydrogenated hydrocarbons and some unconverted paraffins;
- separating the vapor phase from the process stream thereby creating a product stream;
- passing the product stream to a cooling unit, thereby creating a cooled product stream;
- compressing the cooled product stream, thereby creating a compressed cooled product stream;
- cooling the compressed cooled product stream thereby creating a cooled compressed cooled product stream;
- and
- passing a portion of the cooled compressed cooled product stream to mix with the process stream in the reactor above the catalyst bed, wherein the cooled compressed cooled product stream expands upon entry to the reactor, and wherein the temperature of the process stream is reduced below the cracking temperature of the dehydrogenated paraffins.
5 more elements
A process for controlling temperatures in a dehydrogenation reactor, comprising:
- passing a catalyst to a dehydrogenation reactor through at least one catalyst inlet port;
- passing a propane rich stream to the dehydrogenation reactor through a distributor at the bottom of the reactor, thereby creating a process stream comprising catalyst and dehydrogenated hydrocarbons;
- separating the catalyst from the process stream thereby creating a product stream, comprising light olefins;
- cooling the product stream in a cooling unit, thereby creating a cooled product stream;
- compressing the cooled product stream, thereby creating a compressed cooled product stream;
- cooling the compressed cooled product stream thereby creating a cooled compressed cooled product stream;
- and
- passing a portion of the cooled compressed cooled product stream to mix with the process stream to a position above the catalyst inlet port, wherein the cooled compressed cooled product stream expands upon entry to the reactor, and wherein the temperature of the process stream is reduced below the cracking temperature of the dehydrogenated hydrocarbons.
5 more elements
A process for controlling temperatures in a dehydrogenation reactor, comprising:
- passing a catalyst to a dehydrogenation reactor through at least one catalyst inlet port, wherein the dehydrogenation reactor has a lower reactor section for contacting catalyst with a feedstream and an upper section for separation of catalyst from a process stream;
- passing a paraffin rich stream to the dehydrogenation reactor through an inlet distribution system at the bottom of the reactor;
- contacting the catalyst and the paraffin rich stream in a counter-current flow system with the catalyst flowing downward through the reactor and the paraffin rich stream flowing upward through the reactor, thereby creating a process stream
- separating the catalyst from the process stream thereby creating a product stream, comprising olefins;
- passing the product stream to a cooling unit, thereby creating a cooled product stream;
- compressing the cooled product stream, thereby creating a compressed cooled product stream;
- cooling the compressed cooled product stream thereby creating a cooled compressed cooled product stream;
- and
- passing a portion of the cooled compressed cooled product stream to mix with the process stream, wherein the cooled compressed cooled product stream expands upon entry to the reactor, and wherein the temperature of the process stream is reduced below the cracking temperature of the dehydrogenated paraffins.
6 more elements
Dependencies are inferred from the claim text.