Process for a dual extract flush
AssigneeUop LLC
InventorsAnton N. Mlinar, Gregory A. Ernst, R. Jason L. Noe
Life of this patent
Estimating the term…
Abstract
The present invention relates to dual extract flush for feeds for xylene extraction processes. More specifically, the present invention relates to dual extract flush for feeds for simulated moving bed extraction processes. It decouples line flush in and line flush out, providing a means for optimizing each flush independently. This scheme will allow for minimizing each bedline and flushing each according to its own bedline volume, which will minimize any additional non-ideal compositions added to the chambers or downstream fractionation.
Claims20
A process for a dual extract flush, comprising:
- passing a feed and desorbent into a unit wherein the unit comprises a desorption zone, a purification zone, and an adsorption zone wherein the desorption zone is located between a desorbent inlet at the top of the desorption zone and an extract outlet at the top of the purification zone, the purification zone is located between the extract outlet and a feed inlet at the top of the adsorption zone, and the adsorption zone is located between the feed inlet and a raffinate outlet at the bottom of the adsorption zone, wherein the feed is introduced through the feed inlet and the desorbent is introduced through the desorbent inlet;
- removing an extract stream from the unit through the extract outlet and splitting a portion of the extract stream into a first flush and a second flush;
- and
- passing the first flush and the second flush back to the unit in the purification zone through a first flush inlet and a second flush inlet.
A process for a dual extract flush, comprising:
- passing a feed and a desorbent to a unit comprising a plurality of beds wherein the unit comprises a desorption zone, a purification zone, and an adsorption zone wherein the desorption zone is located between a desorbent inlet at the top of the desorption zone and an extract outlet, the purification zone is located between the extract outlet and a feed inlet, and the adsorption zone is located between the feed inlet and a raffinate outlet at the bottom of the adsorption zone, wherein the feed is introduced through the feed inlet and the desorbent is introduced through the desorbent inlet;
- removing an extract stream from the unit through the extract outlet;
- splitting the extract stream into a first flush and a second flush;
- and
- passing the first flush and the second flush back to the unit in the purification zone through a first flush inlet and a second flush inlet, wherein the first flush comprises about 60% to about 80% of the flush and the second flush comprises about 40% to about 20% of the flush.
Dependencies are inferred from the claim text.