Lower alkyl alcohol recovery from a stripping mixture

C - Chemistry – Metallurgy – 07 – H

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C07H 15/04 (2006.01) C08G 63/90 (2006.01)

Patent

CA 2316217

Methods of removing a lower alkyl alcohol from a polyester mixture of polyol fatty acid polyester and lower alkyl alcohol comprise (a) contacting the polyester mixture with a stripping mixture comprising an inert stripping gas, up to about 10,000 ppm lower alkyl alcohol and up to about 2000 ppm oxygen, wherein at least a portion of the lower alkyl alcohol is transferred from the polyester mixture to the stripping mixture, thereby increasing the concentration of lower alkyl alcohol in the stripping mixture, and (b) separating the stripping mixture from the polyester mixture. The methods further comprise (c) compressing the stripping mixture to increase its pressure, (d) cooling the stripping mixture to reduce its temperature thereby condensing at least a first portion of the lower alkyl alcohol to a liquid, (e) separating condensed lower alkyl alcohol from the stripping mixture to reduce the amount of lower alkyl alcohol in the stripping mixture to a range of from about 1 ppm to about 10,000 ppm, and (f) directing the resulting stripping mixture to an expansion turbine in which the temperature and pressure of the stripping mixture are reduced. Energy resulting from the decrease in the stripping mixture temperature and pressure in the expansion turbine is used to compress the stripping mixture separated from the polyester mixture. The methods are used to remove lower alkyl alcohol from polyol fatty acid polyesters. This invention provides an energy efficient method of removing the lower alcohol from the stripping mixture.

Procédés servant à supprimer un alcool d'alkyle inférieur depuis un mélange de polyester composé de polyester d'acide gras de polyol et d'alcool d'alkyle inférieur et consistant à (a) mettre en contact ce mélange de polyester avec un mélange d'extraction contenant un gaz d'extraction inerte, 10.000 ppm maximum d'alcool d'alkyle inférieur et 2000 ppm maximum d'oxygène, au moins une partie de l'alcool d'alkyle inférieur étant transférée du mélange de polyester au mélange d'extraction, ce qui augmente la concentration d'alcool d'alkyle inférieur dans le mélange d'extraction, et (b) à séparer le mélange d'extraction du mélange de polyester. Ces procédés consistent, de plus, (c) à comprimer le mélange d'extraction afin d'en augmenter la pression, (d) à refroidir le mélange d'extraction afin d'en réduire la température, ce qui permet de condenser au moins une première partie de l'alcool d'alkyle inférieur afin d'obtenir un liquide, (e) à séparer l'alcool d'alkyle inférieur condensé du mélange d'extraction afin de limiter la quantité d'alcool d'alkyle inférieur dans le mélange d'extraction à une valeur située entre 1 ppm et 10.000 ppm et (f) à diriger le mélange d'extraction obtenu vers une turbine d'expansion dans laquelle la température et la pression du mélange d'extraction sont diminuées. On utilise l'énergie produite par la diminution de la température et de la pression du mélange d'extraction dans la turbine d'expansion afin de comprimer ce mélange d'extraction séparé du mélange de polyester.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Lower alkyl alcohol recovery from a stripping mixture does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lower alkyl alcohol recovery from a stripping mixture, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lower alkyl alcohol recovery from a stripping mixture will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1349151

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.