Process for removing oxygenate from an olefin stream

摘要

The present invention relates to a process for producing an olefinic product, comprising (a) preparing a reaction product by converting an oxygenate-comprising feedstock in an oxygenate to olefin process, the reaction product comprising at least C2+ olefins and DME, (b) separating at least part of the reaction product by means of extractive distillation using a butanol solvent into: (i) a first fraction comprising C3− olefins and butanol; and (ii) a second fraction comprising C4+ olefins, DME and butanol; (c) separating the first fraction into: (iii)a C3− olefinic product; and (iv) a third fraction comprising butanol; (d) separating the second fraction into: (v) a DME-comprising C4-C5 olefinic product; and (vi) a fourth fraction comprising butanol and C6+ olefins, wherein at least part of the third and/or fourth fraction are recycled to step (b) together with or as part of the butanol solvent.

主权项

1. A process for producing an olefinic product, comprising:
a) preparing a reaction product by converting an oxygenate-comprising feedstock in an oxygenate to olefin process, the reaction product comprising at least C2+ olefins and dimethylether (DME); b) separating at least part of the reaction product by means of extractive distillation using a butanol solvent into:
a first fraction comprising C3− olefins and butanol; anda second fraction comprising C4+ olefins, dimethylether and butanol; c) separating the first fraction into:
a C3− olefinic product; anda third fraction comprising butanol; and d) separating the second fraction into:
a dimethylether-comprising C4-C5olefinic product; anda fourth fraction comprising butanol and C6+ lefins, wherein at least part of the third and/or fourth fraction are recycled to step (b) together with or as part of the butanol solvent.