Process for converting methanol to olefins
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United States of America Patent
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Sep 2, 2003
Grant Date -
N/A
app pub date -
Sep 23, 1999
filing date -
Sep 23, 1999
priority date (Note) -
Expired
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Abstract
There is provided a process for converting methanol or dimethyl ether to a product containing C.sub.2 to C.sub.4 olefins, which comprises the step of contacting a feed containing methanol or dimethyl ether with a catalyst which comprises a zeolite having 10-ring intersecting channels, such as ZSM-5, and which has a Diffusion Parameter for 2,2-dimethylbutane of less than 100 sec.sup.-1 when measured at a temperature of 120.degree. C. and a 2,2-dimethylbutane pressure of 60 torr (8 kPa). The contacting step is conducted at a temperature of 370 to 480.degree. C., a methanol partial pressure of 30 to 150 psia and a methanol conversion per pass of less than 95%.
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