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US 10,329,498 B2Granted
Two-bed paraffin to olefin enhancement process
OwnerCharles P. Luebke, Zheng Wang +2inventors
InventorsCharles P. Luebke, Zheng Wang, Jayant K. Gorawara, Stephen W. Sohn
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Abstract
A process is presented for the purification of an olefins feed stream to a benzene alkylation unit. The process removes heavy aromatics in an adsorbent system comprising at least two adsorbent units. The unit passes the olefins feed stream to a first adsorbent unit, while the second adsorbent unit is either in regeneration mode, or standby mode. The process switches the feed stream to the second adsorbent unit and displaces the fluid in the second adsorbent unit, while maintaining the flow of the purified feed stream to the benzene alkylation unit.
Claims20
A process for the removal of heavy aromatics from an olefins stream comprising:
- passing an olefins feed stream to a first adsorbent unit in an adsorbent system comprising at least two adsorbent units to generate a first adsorbent effluent stream with reduced heavy aromatics content;
- running the first adsorbent unit until breakthrough;
- equalizing pressure in a second adsorbent unit to the pressure of the first adsorbent unit;
- passing the olefins feed stream to the second adsorbent unit to generate a second adsorbent unit effluent stream with reduced heavy aromatics content;
- passing the second adsorbent unit effluent stream to the first adsorbent unit, and displacing the first adsorbent unit fluid;
- discontinuing the first adsorbent unit displacement;
- passing regenerant to the first adsorbent unit to regenerate the first adsorbent unit, wherein the regenerant flows in a counter-current direction relative to the olefin feed stream through the first adsorbent unit;
- equalizing the in the first adsorbent unit to the pressure of the second adsorbent unit;
- passing the olefins feed stream to the first adsorbent unit to generate the first adsorbent unit effluent stream;
- passing the first adsorbent unit effluent stream to the second adsorbent unit, wherein the first adsorbent unit effluent stream to the second adsorbent unit flows in a counter-current direction relative to the olefin feed stream through the second adsorbent unit, and displacing the second adsorbent unit fluid;
- discontinuing the second adsorbent unit displacement;
- and
- passing regenerant to the second adsorbent unit to regenerate the second adsorbent unit, wherein the regenerant flows in a counter-current direction relative to the olefin feed stream through the first adsorbent unit.
10 more elements
A process for the removal of heavy aromatics from an olefins stream comprising:
- passing an olefins feed stream to a first adsorbent unit in an adsorbent system comprising at least two adsorbent units to generate a first adsorbent effluent stream with reduced heavy aromatics content;
- running the first adsorbent unit until breakthrough;
- equalizing pressure in a second adsorbent unit to the pressure of the first adsorbent unit;
- passing the olefins feed stream to the second adsorbent unit to generate a second adsorbent unit effluent stream with reduced heavy aromatics content;
- passing the second adsorbent unit effluent stream to the first adsorbent unit, and displacing the first adsorbent unit fluid;
- discontinuing the first adsorbent unit displacement and moving the first adsorbent unit off-line and the second adsorbent unit on-line;
- performing a trim displacement of the first adsorption unit following the first adsorption unit displacement;
- passing regenerant to the first adsorbent unit to regenerate the first adsorbent unit, wherein the regenerant flows in a counter-current direction relative to the olefin feed stream through the first adsorbent unit;
- equalizing the in the first adsorbent unit to the pressure of the second adsorbent unit;
- pass the olefins feed stream to the first adsorbent unit to generate the first adsorbent unit effluent stream;
- passing the first adsorbent unit effluent stream to the second adsorbent unit, wherein the first adsorbent unit effluent stream to the second adsorbent unit flows in a counter-current direction relative to the olefin feed stream to the second adsorbent unit, and displacing the second adsorbent unit fluid;
- discontinuing the second adsorbent unit displacement and moving the second adsorbent unit off-line and the first adsorbent unit on-line;
- performing a trim displacement of the second adsorption unit following the second adsorption unit displacement;
- and
- passing regenerant to the second adsorbent unit to regenerate the second adsorbent unit, wherein the regenerant flows in a counter-current direction relative to the olefin feed stream through the first adsorbent unit.
12 more elements
Dependencies are inferred from the claim text.