Process for the removal of oxygenates from a gaseous stream
The present invention relates to a process for the removal of oxygenates from a gaseous stream also comprising carbon dioxide, said process comprising: a) providing a first gaseous stream comprising one or more mono-olefin(s), at least 100 ppm (by weight) of one or more oxygenates and at least 0.1 wt % carbon dioxide, and b) treating the first gaseous stream to produce a second gaseous stream comprising one or more mono-olefin(s) and at least 0.1 wt % carbon dioxide with reduced oxygenate content, wherein said treating comprises contacting the first gaseous stream with a first aqueous stream and with a first liquid hydrocarbon stream, and c) subsequently treating the second gaseous stream to remove the carbon dioxide therein.
1. A process for the removal of oxygenates from a gaseous stream also comprising carbon dioxide, said process comprising:
a) providing a first gaseous stream comprising one or more mono-olefin(s), at least 100 ppm (by weight) of one or more oxygenates and at least 0.1 wt % carbon dioxide, and
b) treating the first gaseous stream to produce a second gaseous stream comprising one or more mono-olefin(s) and at least 0.1 wt % carbon dioxide with reduced oxygenate content, wherein said treating comprises contacting the first gaseous stream with a first aqueous stream comprising at least 95 wt % water and with a first liquid hydrocarbon stream, and
c) subsequently treating the second gaseous stream to remove the carbon dioxide therein, the majority of the carbon dioxide in the first gaseous stream being removed in step (c).
2. A process according to claim 1 , wherein the first aqueous stream and the first liquid hydrocarbon stream each have less than 2 wt % of any components which would react or complex with the carbon dioxide.
3. A process according to claim 1 wherein the first liquid hydrocarbon stream comprises at least 95 wt % liquid hydrocarbons.
4. A process according to claim 1 wherein the first gaseous stream comprising one or more mono-olefin(s), at least 100 ppmw of one or more oxygenates and at least 0.1 wt % carbon dioxide is a product stream resulting from an autothermal cracking process wherein the process comprises partially combusting a mixture of a hydrocarbon feed and a molecular oxygen containing gas in contact with a catalyst capable of supporting combustion beyond the normal fuel rich limit of flammability.
5. A process according to claim 1 wherein the first gaseous stream comprising one or more mono-olefin(s), at least 100 ppm (by weight) of one or more oxygenates and at least 0.1 wt % carbon dioxide is provided at a pressure of at least 5 barg and the contacting of the first gaseous stream with the first aqueous stream and the first gaseous stream with the first liquid hydrocarbon stream are each performed at pressures of at least 5 barg.
6. A process according to claim 1 wherein the first gaseous stream comprising one or more mono olefins, at least 100 ppmw of one or more oxygenates and at least 0.1 wt % carbon dioxide also comprises molecular oxygen.
7. A process according to claim 1 wherein the oxygenates comprise at least one of an aldehyde, a ketone, an ester or a carboxylic acid, or a mixture thereof.
8. A process according to claim 1 wherein the first liquid hydrocarbon stream is a gasoline, diesel or gas oils.