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Method for adding heat to a reactor system used to convert oxygenates to olefins

A compound and olefin technology, applied in the direction of producing hydrocarbons from oxygen-containing organic compounds, carbon compound catalysts, chemical instruments and methods, etc., can solve problems such as the risk of large extinguishment combustion

Inactive Publication Date: 2005-08-17
EXXONMOBIL CHEM PAT INC
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Also, there is a greater risk of extinguishing combustion due to low temperature excursions

Method used

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  • Method for adding heat to a reactor system used to convert oxygenates to olefins
  • Method for adding heat to a reactor system used to convert oxygenates to olefins

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Embodiment Construction

[0061] As noted above, the conversion of oxygenate feedstock to olefins is an exothermic reaction. Once initiated, the reaction is self-sustaining without the addition of external heating. However, there are certain instances where it is necessary to add heat to the above reactor / regenerator system other than that generated by the reaction of the oxygenate feedstock to olefins. Examples include initial drying of refractory linings for reactor and regenerator systems, initial preheating of reactors prior to introduction of oxygenate feedstock, and maintaining reaction temperatures during short-term outages of oxygenate feedstock.

[0062] The process of the present invention achieves this by adding supplemental heat to the regenerator by feeding heating fuel directly into the catalyst fluidized bed. The fluidizing air provides the oxygen for combustion of the heating fuel. The fluidized catalyst particles are well mixed and have sufficient heat capacity to evenly distribute t...

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Abstract

The present invention provides a method for adding heat to a reactor system used to convert oxygenates to olefin, in which supplemental heat is added with a heating fuel, e.g., a torch oil, having low autoignition temperature, low sulfur, and low nitrogen content.

Description

field of invention [0001] The present invention relates to a process for converting an oxygenate-comprising feedstock to a light olefin-comprising product, wherein supplemental heat is supplied with a heating fuel having a low autoignition temperature, low sulfur and low nitrogen content. Background of the invention [0002] Light olefins, defined herein as ethylene, propylene, butene, and mixtures thereof, are used as feedstocks for the production of many important chemicals and polymers. In particular, light olefins are used in the manufacture of polyolefins such as polypropylene and polyethylene. Catalysts for polyethylene and polypropylene require products that are substantially free of contaminants such as sulfur and nitrogen. When sulfur and nitrogen compounds are present in the olefin feed, the catalyst becomes less effective, resulting in lower quality commercial products or less efficient polymerized products. [0003] An emerging technology for the production of ...

Claims

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Application Information

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IPC IPC(8): B01J29/90B01J38/30C07C1/20
CPCC07C2529/70C07C2529/85B01J29/90C07C1/20B01J38/30Y02P20/584Y02P30/20Y02P30/40C07C11/02
Inventor J·R·拉特尼尔K·H·库施乐R·沃尔特
Owner EXXONMOBIL CHEM PAT INC
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