Disclosed are embodiments of a method of regenerating a desiccant in an off-line treater of a polyolefin production process. The method may include a heating phase followed by a cooling phase. The heating phase may involve use of a regenerating gas made from heating a treated a recycle stream of the
Disclosed are embodiments of a method of regenerating a desiccant in an off-line treater of a polyolefin production process. The method may include a heating phase followed by a cooling phase. The heating phase may involve use of a regenerating gas made from heating a treated a recycle stream of the polyolefin production process to regenerate desiccant in an off-line treater. The cooling phase may involve thermosyphoning the regenerating gas, nitrogen, an olefin-free diluent, or combinations thereof in a closed-convection loop of the off-line treater.
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1. A method for reducing NOx emissions when regenerating a desiccant in an off-line treater comprising: regenerating at least a portion of the desiccant in the off-line treater using a regenerating gas which comprises a treated recycle stream to yield a regenerating effluent stream comprising one or
1. A method for reducing NOx emissions when regenerating a desiccant in an off-line treater comprising: regenerating at least a portion of the desiccant in the off-line treater using a regenerating gas which comprises a treated recycle stream to yield a regenerating effluent stream comprising one or more impurities and the regenerating gas; andflaring the one or more impurities obtained from the regenerating effluent stream, wherein the step of flaring produces fewer of the NOx emissions compared to a similar method which does not use the treated recycle stream in the regenerating gas. 2. The method of claim 1, wherein the treated recycle stream is obtained by treating a recycle stream of a polyolefin production process in an on-line treater. 3. The method of claim 1, wherein the off-line treater is one of 8 to 40 treaters in a polyolefin production process. 4. The method of claim 1, wherein the treated recycle stream comprises propane, butane, isobutane, pentane, isopentane, hexane, heptane, or a combination thereof. 5. The method of claim 1, further comprising: flowing an impurity stream to a knockout pot before the step of flaring. 6. A method of regenerating a desiccant in an off-line treater comprising: regenerating at least a portion of the desiccant in the off-line treater using a regenerating gas which comprises a treated recycle stream from a polyolefin production process to yield a regenerating effluent stream. 7. The method of claim 6, wherein the treated recycle stream is obtained by treating a recycle stream of the polyolefin production process in an on-line treater. 8. The method of claim 6, wherein the treated recycle stream, the regenerating gas, and the regenerating effluent stream, each comprise diluent from the polyolefin production process. 9. The method of claim 8, wherein the regenerating gas and the regenerating effluent stream comprise the diluent in a gaseous phase. 10. The method of claim 8, wherein the treated recycle stream comprises the diluent in a liquid phase. 11. The method of claim 8, wherein the diluent is propane, butane, isobutane, pentane, isopentane, hexane, heptane, or combinations thereof. 12. A desiccant regeneration system comprising: an on-line treater treating a recycle stream from a polyolefin production process to yield a treated recycle stream;a heater receiving and heating at least a portion of the treated recycle stream to yield a regenerating gas; andan off-line treater receiving the regenerating gas and regenerating a desiccant in the off-line treater. 13. The system of claim 12, wherein the off-line treater comprises a closed-convection loop thermosyphoning the regenerating gas, nitrogen, or both and cooling the off-line treater during a cooling phase of desiccant regeneration. 14. The system of claim 13, wherein the closed-convection loop comprises a finned air cooler. 15. The system of claim 12, further comprising: a regenerating effluent stream connected to the off-line treater;a separator separating the regenerating effluent stream into an impurity stream and a regenerating recycle stream; anda knockout pot receiving the impurity stream and recovering impurities,a flare receiving and flaring the impurities, wherein flaring the impurities produces fewer NOx emissions compared to a similar system which does not use the treated recycle stream to yield the regenerating gas. 16. The system of claim 12, further comprising: a regenerating effluent stream connected to the off-line treater;wherein the heater is a cross exchanger which heats the at least a portion of the treated recycle stream using the regenerating effluent stream. 17. The system of claim 16, wherein the heater separates the regenerating effluent stream into an impurity stream and a regenerating recycle stream, the system further comprising: a knockout pot receiving the impurity stream and recovering impurities,a flare receiving and flaring the impurities, wherein flaring the impurities produces fewer NOx emissions compared to a similar system which does not use the treated recycle stream to yield the regenerating gas. 18. The system of claim 12, wherein the off-line treater is one of a pair of feed treaters configured to treat a feed stream for the polyolefin production process when on-line, and wherein the pair of feed treaters is one pair of 4 to 20 pairs of feed treaters in the polyolefin production process. 19. The system of claim 18, wherein the on-line treater is a recycle treater configured to treat the recycle stream. 20. The system of claim 12, wherein the on-line treater and the off-line treater are a pair of recycle treaters configured to treat the recycle stream when on-line, and wherein the pair of recycle treaters are one pair of 4 to 20 pairs of recycle treaters in the polyolefin production process.
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