Multistage process for converting oxygenates to liquid hydrocarbons with ethene recycle
A process for converting oxygenated feedstock comprising methanol, dimethyl ether or the like to liquid hydrocarbons comprising the steps of contacting the feedstock with zeolite catalyst in a primary catalyst stage at elevated temperature and moderate pressure to convert feedstock to hydrocarbons comprising C/sub 2/-C/sub 4/ olefins and C/sub 5/+ hydrocarbons; cooling and separating effluent from the primary stage to recover a liquid hydrocarbon stream and a light hydrocarbon vapor stream rich in C/sub 2/-C/sub 4/ olefins; compressing the olefinic light hydrocarbon stream to condense a liquid olefinic hydrocarbon stream rich in C/sub 3/+ olefins and recovering an ethene-rich gaseous stream; further pressurizing and contacting the condensed liquid olefinic hydrocarbon stream in a secondary catalytic stage with oligomerization catalyst comprising medium-pore shape selective acidic zeolite at substantially increased pressure and moderate temperature to convert at least a portion of olefins to a heavier liquid hydrocarbon product stream comprising olefinic gasoline and distillate range liquids; and recovering ethene in a gaseous stream for recycle to the primary catalytic stage.
- Assignee:
- Mobil Oil Corp.
- Patent Number(s):
- US 4543435
- OSTI ID:
- 5839477
- Country of Publication:
- United States
- Language:
- English
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