PROCESS FOR PREPARING ETHYLENE, PROPYLENE AND ISOPRENE FROM AN OXYGENATE

摘要

The invention relates to a process for preparing ethylene, propylene and isoprene from an oxygenate, the process comprising the following steps: a) contacting the oxygenate with a molecular sieve-comprising catalyst, at a temperature in the range of from 350 to 1000° C. to produce an oxygenate conversion effluent comprising ethylene, propylene and C4+ hydrocarbons including C4+ paraffins and C4+ olefins including isobutene; b) subjecting the oxygenate conversion effluent to one or more separation steps such that at least an olefin product stream comprising ethylene and/or propylene, and a stream comprising C4 hydrocarbons including butane, n-butenes and isobutene, are obtained; c) reacting at least part of the isobutene with formaldehyde to produce isoprene.

主权项

1. A process for preparing ethylene, propylene and isoprene from an oxygenate, the process comprising the following steps:
a) contacting the oxygenate with a molecular sieve-comprising catalyst, at a temperature in the range of from 350 to 1000° C. to produce an oxygenate conversion effluent comprising ethylene, propylene and C4+ hydrocarbons including C4+ paraffins and C4+ olefins including isobutene; b) subjecting the oxygenate conversion effluent to one or more separation steps such that at least an olefin product stream comprising ethylene and/or propylene, and a stream comprising C4 hydrocarbons including butane, n-butenes and isobutene, are obtained; c) reacting at least part of the isobutene with formaldehyde to produce isoprene.