Coolant comprising azole derivatives for cooling systems in fuel-cell drives
AssigneeBASF SE
InventorsBernd Wenderoth, Stefan Dambach, Ladislaus Meszaros, Uwe Fidorra
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Abstract
An antifreeze concentrate for cooling systems in fuel-cell drives which gives ready-to-use aqueous coolant compositions having a conductivity of at most 50 μS/cm, based on alkylene glycols or derivatives thereof and containing one or more five-membered heterocyclic compounds (azole derivatives) having 2 or 3 hetero atoms from the group consisting of nitrogen and sulfur, which contain no or at most one sulfur atom and which may carry a fused aromatic or saturated six-membered ring.
Claims8
1-8. (canceled)
A ready-to-use aqueous fuel cell coolant composition having an initial conductivity of at most 50 mS/cm and which consists essentially of
- (a) from 10 to 90% by weight of alkylene glycols or derivatives thereof,
- (b) from 90 to 10% by weight of water,
- (c) from 0.005 to 5% by weight of an azole derivative, and
- (d) orthosilicates in an amount to provide the aqueous coolant composition with a silicon content of from 2 to 2000 ppm by weight, wherein
- the azole derivative consists of one or more five-membered heterocyclic compounds having 2 or 3 heteroatoms selected from the group consisting of nitrogen and sulfur, which contain no or at most one sulfur atom and which may carry a fused aromatic or saturated six-membered ring.
A fuel cell cooling system comprising an aqueous fuel cell coolant composition having an initial electrical conductivity of at most 50 mS/cm, wherein said fuel cell coolant composition consists essentially of an alkylene glycol and water solution, and an azole derivative additive consisting of one or more five-membered heterocyclic compounds having 2 or 3 heteroatoms selected from the group consisting of nitrogen and sulfur, which contain no or at most one sulfur atom and which may carry a fused aromatic or saturated six-membered ring, and optionally an orthosilicate in an amount to provide a silicon content of from 2 to 2000 ppm by weight.
A fuel cell cooling system comprising an aqueous coolant composition having an initial conductivity of at most 50 mS/cm and which consists essentially of
- (a) from 10 to 90% by weight of alkylene glycols or derivatives thereof,
- (b) from 90 to 10% by weight of water,
- (c) from 0.005 to 5% by weight of an azole derivative, and
- (d) orthosilicates in an amount which gives a ready-to-use aqueous coolant composition having a silicon content of from 2 to 2000 ppm by weight, wherein
- the azole derivative consists of one or more five-membered heterocyclic compounds having 2 or 3 heteroatoms selected from the group consisting of nitrogen and sulfur, which contain no or at most one sulfur atom and which may carry a fused aromatic or saturated six-membered ring.
Dependencies are inferred from the claim text.