Fluidized bed reactor with back-mixing for dehydrogenation of light paraffins

A fluidized bed reactor and fluidized bed technology are applied in the fields of organic chemistry, dehydrogenation of hydrocarbons, hydrocarbons, etc., and can solve the problems of complex product stream separation and other problems.

Active Publication Date: 2013-02-13
UOP LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The other disadvantage is that the high temperature that pushes the equilibrium in favor of the olefin product also promotes rapid deactivation of the catalyst by coking
High temperatures can also lead to thermal cracking of alkanes - i.e. undesired non-selective side reactions that lead to the formation of by-products with a wide range of carbon numbers, which complicates the separation of product streams

Method used

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  • Fluidized bed reactor with back-mixing for dehydrogenation of light paraffins
  • Fluidized bed reactor with back-mixing for dehydrogenation of light paraffins

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Embodiment

[0020] A comparison of the present invention with a conventional moving bed reactor system was performed using engineering simulations to illustrate the advantages of the present invention.

[0021] In the base case of the prior art process, a mixture of hydrogen and propane is fed to a system of four adiabatic reactors with intermediate heaters between each reactor. The temperature at the inlet of each reactor was 655°C. The pressure at the outlet of the last reactor was 170 kPa (10 psig). The process achieved a conversion of propane of 40% with a selectivity to propane of 84 mole % (moles of propylene formed per mole of propane reacted). In the process of the present invention, a mixture of hydrogen and propane is fed to a single-stage back-mixed reactor with an inlet temperature of 632°C and an outlet pressure of 170 kPa (10 psig). The process achieved a conversion of propane of 40% with a selectivity to propylene of 96 mole%.

[0022] In summary, the present invention i...

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Abstract

An improved process and system for the endothermic dehydrogenation of an alkane stream (1) is described. The process and system of the present invention comprise a back-mixed fluidized bed reactor (4). The alkane stream is dehydrogenated in a single reactor stage by contacting the alkane stream with a back-mixed fluidized bed (44) of catalyst. Deactivated catalyst (38) is withdrawn from the back-mixed fluidized reactor and heated to produce hot regenerated catalyst (36). The hot regenerated catalyst is returned to the back-mixed fluidized bed reactor at a rate sufficient to maintain the back-mixed fluidized bed reactor at substantially isothermal conditions.

Description

field of invention [0001] The present invention relates to catalytic dehydrogenation processes and systems with improved conversion and selectivity and lower operating and installation costs. Background of the invention [0002] In the petroleum refining industry, the catalytic dehydrogenation of alkanes (paraffins) to produce olefins (alkenes) is an important and well known hydrocarbon conversion process. This is because olefins are often used as intermediates in the production of other more valuable hydrocarbon conversion products. For example, propylene can be used to make polymers and polypropylene glycol, butene can be used to make higher octane motor fuel and isobutene can be used to make methyl-tert-butyl ether, a gasoline additive. [0003] The catalytic dehydrogenation of alkanes is an endothermic reaction. This reaction is very fast and reversible, and the conversion rate is limited by thermodynamic equilibrium conditions. High temperatures and low pressures fav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/18
CPCC07C2523/26C07C2523/28C07C2521/16C07C5/325C07C2521/08C07C2523/75C07C2523/36C07C2523/755C07C2523/42C07C5/324C07C2523/44C07C2523/745C07C2523/30C07C2521/04Y02P20/584C07C11/02B01J8/18B01J21/04C07C5/32
Inventor B·K·戈罗维J·A·萨拉加M·A·舒尔茨
Owner UOP LLC
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