C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 7/20 (2006.01) C09K 8/52 (2006.01) C10L 3/06 (2006.01) C10L 3/10 (2006.01) F17D 1/05 (2006.01)
Patent
CA 2197800
A method for inhibiting the formation of clathrate hydrates in a fluid (e.g. natural gas) having hydrate-forming constituents is disclosed. The hydrate inhibitors used in the method are substantially water soluble polymers formed from an N-substituted acrylamide having two nitrogen substituent groups, R1 and R2, where R1 is a hydrocarbon group having from one to ten carbon atoms and zero to four heteroatoms selected from the group consisting of nitrogen, oxygen, sulfur, and combinations thereof, and R2 is a hydrogen atom or a hydrocarbon group having from one to ten carbon atoms and zero to four heteroatoms selected from the group consisting of carbon, nitrogen, oxygen, and sulfur. Alternatively, R1 and R2 may be linked to produce a cyclic ring having ten atoms comprising a combination of between three and ten carbon atoms and zero to four heteroatoms selected from the group consisting of nitrogen, oxygen, sulfur, and combinations thereof. Some examples of such inhibitors include poly(N-ethylacrylamide), poly(N,N-diethylacrylamide), poly(N-methyl, N-acrylamide), poly(iso-propylacrylamide), poly(N-propylacrylamide), poly(N-cyclopentylacrylamide), poly(N-cyclohexylacrylamide), poly(acryloylpyrrolidine), poly(acryloylpiperidine), poly(acryloylmorpholine) and various N-substituted acrylamide copolymers.
L'invention concerne un procédé permettant d'inhiber la formation d'hydrates clathrates dans un fluide (par exemple du gaz naturel) contenant des constituants pouvant former des hydrates. Les inhibiteurs de formation d'hydrates utilisés selon ledit procédé sont des polymères sensiblement solubles dans l'eau formés à partir d'un acrylamide substitué en N, présentant deux substituants au niveau de l'azote, R1 et R2. R1 est un groupe hydrocarboné possédant 1 à 10 atomes de carbone et 0 à 4 hétératomes choisis parmi azote, oxygène, soufre, et des combinations de ceux-ci. R2 est un atome d'hydrogène ou un groupe hydrocarboné possédant 1 à 10 atomes de carbone et 0 à 4 hétéroatomes choisis parmi carbone, azote, oxygène et soufre. Selon une variante, R1 et R2 peuvent être liés pour produire un cycle possédant 10 atomes comprenant une combinaison de 3 à 10 atomes de carbone et de 0 à 4 hétéroatomes choisis parmi azote, oxygène, soufre et des combinaisons de ceux- ci. Comme exemples de tels inhibiteurs, on trouve le poly(N-éthylacrylamide), le poly(N,N-diéthylacrylamide), le poly(N-méthyle, N-acrylamide), le poly(iso- propylacrylamide), le poly(N-propylacrylamide), le poly(N- cyclopentylacrylamide), le poly(N-cyclohexylacrylamide), la poly(acryloylpyrrolidine), la poly(acryloylpipéridine), la poly(acryloylmorpholine) et divers copolymères acrylides substitués en N.
Berluche Enoche
Colle Karla Schall
Costello Christine Ann
Longo John Michael
Oelfke Russell Harlan
Borden Ladner Gervais Llp
Exxon Production Research Company
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