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Method for controlling the ratio of ethylene to propylene produced in an oxygenate to olefin conversion process

An ethylene and propylene technology, applied in the field of forming ethylene and propylene, which can solve problems such as insensitivity

Active Publication Date: 2006-12-20
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has recently been found that, while percent conversion can vary with reaction conditions such as temperature or pressure, the selectivity of methanol-containing feedstocks to ethylene and propylene in OTO reaction systems is relatively insensitive to changes in reaction conditions

Method used

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  • Method for controlling the ratio of ethylene to propylene produced in an oxygenate to olefin conversion process
  • Method for controlling the ratio of ethylene to propylene produced in an oxygenate to olefin conversion process
  • Method for controlling the ratio of ethylene to propylene produced in an oxygenate to olefin conversion process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0322] Embodiment 1 (contrast): Methanol is as OTO raw material

[0323] In Example I (comparative example), a feedstock comprising 99.5 wt% methanol (-0.5 wt% water) was introduced into an OTO microfluidic reactor for its conversion to light olefins. The resulting effluent stream was then analyzed to determine the amount of ethylene relative to propylene formed in the microfluidic reactor. The amount of other products formed in the microfluidic reactor was also determined.

[0324] A SAPO-34 molecular sieve catalyst composition, designated Catalyst Composition "A," was formulated according to US Patent No. 6,440,894, the entire contents of which are incorporated herein by reference. The atomic ratio of silicon to aluminum of the synthetic SAPO-34 molecular sieve used to form the catalyst composition was determined to be 0.068 based on inductively coupled plasma (ICP) spectroscopic analysis. The prepared catalyst composition has the following overall composition: 40 wt% mole...

Embodiment II

[0333] Embodiment II: The methanol and ethanol weight ratio in the OTO raw material is 9: 1

[0334] In Example II, a feedstock comprising 90 wt% methanol and 10 wt% ethanol was introduced into an OTO microfluidic reactor for its conversion to light olefins. The oxygenate-containing feed was introduced into the reactor containing Catalyst Composition A under the same conditions as described in Example I (100 WHSV and 25 psig (175 kPag)). However, unlike Example 1, 9-15 runs were performed for each of the following reaction temperatures: 425°C, 450°C, 475°C, and 500°C to determine the effect of temperature on conversion of feedstock containing mixed alcohols to light olefins and Selective effects (if any).

[0335] The resulting effluent stream was then analyzed in the manner described above in Example I to determine the relative amounts of ethylene and propylene formed in the OTO reactor. The amount of other products formed in the microfluidic reactor was also determined. T...

Embodiment III

[0339] Example III: The ratio of methanol to ethanol in the OTO feedstock is 8:2

[0340] In Example III, a feedstock comprising 80 wt% methanol and 20 wt% ethanol was introduced into an OTO microfluidic reactor for its conversion to light olefins. The oxygenate-containing feed was introduced into the reactor containing Catalyst Composition A under the same conditions as described in Example I (100 WHSV and 25 psig (175 kPag)). However, unlike Example 1, tests were performed for each of the following reaction temperatures: 450°C, 475°C, and 500°C to determine the effect of temperature on the conversion and selectivity (if any) of the feedstock containing mixed alcohols to light olefins. if).

[0341] The resulting effluent stream was then analyzed in the manner described above in Example I to determine the relative amounts of ethylene and propylene formed in the OTO reactor. The amount of other products formed in the microfluidic reactor was also determined. The results of ...

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Abstract

The present invention provides various processes for producing methanol and ethanol, preferably in a mixed alcohol stream. In one embodiment, the invention includes directing syngas to a synthesis zone wherein the syngas contacts a methanol synthesis catalyst and an ethanol synthesis catalyst under conditions effective to form methanol and ethanol. The methanol and ethanol, in a desired ratio, are directed to an oxygenate to olefin reaction system for conversion thereof to ethylene and propylene in a desired ratio. The invention also relates to processes for varying the weight ratio of ethylene to propylene formed in an oxygenate to olefin reaction system.

Description

field of invention [0001] The present invention relates to a process for forming ethylene and propylene. More specifically, the present invention relates to a process for forming desired ratios of ethylene and propylene from methanol and ethanol in an oxygenate-olefin reaction system. Background of the invention [0002] Light olefins, defined here as ethylene and propylene, are important petrochemical commodities useful in many processes for making plastics and other compounds. Ethylene is used to make various polyethylene plastics, as well as to make other chemicals such as vinyl chloride, ethylene oxide, ethylbenzene, and alcohols. Propylene is used to make various polypropylene plastics, as well as to make other chemicals such as acrylonitrile and propylene oxide. [0003] The fact that oxygenates, especially alcohols, can be converted into light olefins has been known for some time in the petrochemical industry. The preferred conversion process is generally referred ...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C29/151
CPCC07C2529/85C07C29/1518C07C2523/72C07C1/20C07C2523/06C07C2521/04C07C2523/26Y02P30/20Y02P30/40C07C11/02C07C31/04C07C31/08C07C31/10C07C31/12
Inventor M·J·G·雅森C·F·范埃格蒙德L·R·M·马滕斯J·谢尔J·R·拉特纳徐腾A·阿尔戈
Owner EXXONMOBIL CHEM PAT INC
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