Lubricant composition for ammonia based refrigerants with...

C - Chemistry – Metallurgy – 10 – M

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C10M 171/00 (2006.01) C09K 5/04 (2006.01) C10M 101/02 (2006.01) C10M 107/02 (2006.01) C10M 145/30 (2006.01) C10M 145/32 (2006.01) C10M 145/34 (2006.01) C10M 145/36 (2006.01) C10M 169/04 (2006.01)

Patent

CA 2403226

A problem with refrigeration systems using ammonia as the refrigerant and hydrocarbon lubricants is that the seals/gaskets of the systems have a tendency to harden and shrink. This can cause leakage of the refrigerant and eventually require disassembly of the equipment and replacement of the seals. The addition of a small amount polyether having an aromatic fragment of 6-18 carbon atoms or an aliphatic fragment of 10-22 carbon atoms can soften the seals and partially re-swell the seals solving the leakage problem and avoiding expensive maintenance costs. Alternatively a polyether of 1,2-butylene oxide which is more oil soluble than most other polyethers with a smaller Z group e.g. derived from alkanols of 1 to 9 carbon would be effective at reducing hardening and shrinkage.

Les joints de système de réfrigération utilisant de l'ammoniac en tant que réfrigérant et des lubrifiants à base d'hydrocarbure, présentent une tendance au durcissement et au rétrécissement. Ceci peut provoquer la fuite du réfrigérant et, éventuellement, nécessiter le démontage de l'installation et le remplacement des joints. L'apport d'une petite quantité de polyéther possédant un fragment aromatique de 6-18 atomes de carbone ou un fragment aliphatique de 10-22 atomes de carbone permet de ramollir les joints et de les regonfler partiellement, ce qui résout le problème des fuites et évite des coûts élevés d'entretien. Dans un autre mode de réalisation, un polyéther de 1,2-butylène oxyde présentant une solubilité dans l'huile supérieure à celle de la plupart des autres polyéters possédant un groupe Z plus petit, par exemple ceux qui sont dérivés des alcanoyles de 1 à 9 atomes de carbone, serait plus efficace pour limiter le durcissement et le rétrécissement.

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