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MTO feed purification

A technology for raw materials and olefins, which can be used in the production of hydrocarbons from oxygen-containing organic compounds, catalysts, organic chemistry, etc., and can solve problems such as expensive

Active Publication Date: 2014-09-10
UOP LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, methanol-to-olefins (MTO) catalysts are expensive and prone to deactivation

Method used

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  • MTO feed purification

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Embodiment Construction

[0009] Methanol-to-olefins (MTO) is an important process that uses expensive catalysts to convert oxygenates to more valuable olefins. This catalyst is easily deactivated by contaminants such as metals in the feedstock. Metals contained in the feedstock include sodium in the form of sodium hydroxide (NaOH). It is important to remove contaminants without loss of methanol. Existing methods of removing contaminants use feedstock vaporization tanks. The feedstock is vaporized leaving metals, but the system still allows NaOH to enter the reactor and deactivate the catalyst.

[0010] Existing methanol-to-olefins processes that pass a feed stream into an MTO reactor pass the feed stream into a feed vaporizer and may include an oxygenate stripper. The overhead stream is then passed to the MTO reactor. This method passes sodium hydroxide (NaOH) into the MTO reactor. Sodium deactivates the MTO catalyst, resulting in shorter cycle times and requiring more frequent regeneration and r...

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Abstract

The present invention proposes a method of improving the quality of an oxygenate feed stream supplied to an oxygenate to olefins conversion reactor. The process includes passing the feed stream to a fractionation column having a sufficient number of plates to remove sodium in the form of sodium hydroxide. Also the fractionation column is sized to have a sufficient number of stages to minimize the amount of oxygenates that flow away with the removed sodium hydroxide.

Description

technical field [0001] The field of the invention is processes for the conversion of methanol to olefins. In particular, a process for the conversion of methanol to olefins using a catalyst susceptible to deactivation by impurities in the feedstock. Background technique [0002] The traditional way to prepare olefins is to crack petroleum raw materials to obtain olefins. This cracking of petroleum feedstocks is done via catalytic cracking, steam cracking processes, or some combination of the two. The olefins produced are usually light olefins such as ethylene and propylene. Light olefins of ethylene and propylene have a broad market. As petroleum feedstocks from crude oil face rising prices, it is advantageous to provide alternative sources for ethylene and propylene. It is well known that olefins can be prepared from oxygenates. The most common oxygenate to olefin conversion is from methanol to light olefins, where methanol can be produced from other sources including ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C31/04C07C29/80
CPCC07C29/82C07C1/20C07C29/88C07C2529/85C07C11/02C07C31/04
Inventor J·A·蒙塔尔巴诺
Owner UOP LLC