Propane recovery process

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 9/08 (2006.01) C07C 7/11 (2006.01) C10G 5/04 (2006.01) F25J 3/02 (2006.01)

Patent

CA 2235883

Increased recovery of propane, butane and other heavier components found in a natural gas stream is achieved by installing an absorber upstream from an expander and a separator. The separator is downstream from the expander and returns the liquid stream generated by the separator back to the absorber. Additionally, the recovery of propane, butane and other heavier components is enhanced by combining the upper gas stream from a distillation column with the upper gas stream from the absorber prior to injecting this combination into the separator. The upper gas stream removed from the separator is then subsequently processed for the recovery of a predominantely methane and ethane gas stream while the bottom liquid stream from the absorber is subsequently distilled for the generation of a stream consisting predominantely of propane, butane and other heavy hydrocarbon components. Alternate embodiments include an additional reflux separator in the system, or substitution of an additional absorber for the separator.

Selon l'invention, on augmente la récupération de propane, butane et autres constituants plus lourds, à l'intérieur d'un flux de gaz naturel, en installant un absorbeur en amont d'un dispositif d'expansion et d'un séparateur. Ce séparateur est situé en aval du dispositif d'expansion et il renvoie vers l'absorbeur le flux liquide produit par le séparateur. En outre, on augmente la récupération de propane, butane et autres constituants plus lourds en combinant le flux de gaz supérieur provenant d'une colonne de distillation avec le flux de gaz supérieur provenant de l'absorbeur, préalablement à l'injection de cette combinaison dans le séparateur. Ensuite, on traite le flux de gaz supérieur enlevé du séparateur, afin de récupérer un flux gazeux à dominante méthane et éthane, tandis que l'on distille ultérieurement le flux liquide inférieur provenant de l'absorbeur, afin de produire un flux composé principalement de propane, butane et autres constituants hydrocarbures lourds. D'autres modes de réalisation comprennent l'ajout dans le système d'un séparateur additionnel de reflux, ou le remplacement du séparateur par un absorbeur supplémentaire.

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