Fuel cell vehicle coolant having improved storage stability and method for producing the same
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United States of America Patent
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Mar 27, 2018
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app pub date -
Oct 30, 2015
filing date -
Nov 14, 2014
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Abstract
There are provided a stock solution composition for fuel cell vehicle coolant used by dilution with a diluent comprising water and a method for producing the same, and further a fuel cell vehicle coolant composition having improved storage stability and a method for producing the same. The present invention relates to a method for producing a stock solution composition for fuel cell vehicle coolant, wherein the stock solution composition comprises at least one ethylene glycol compound selected from the group consisting of ethylene glycol, diethylene glycol, and triethylene glycol, and is used by dilution with a diluent comprising water, and the method comprises the following steps: (a) a step of selecting as a raw material an ethylene glycol compound having an ethylene glycol monoformate content of 60 ppm or less; or (b) a step of selecting as a raw material an ethylene glycol compound, wherein a 50% by mass aqueous solution of the ethylene glycol compound has a conductivity of 4.5 μS/cm or less after heating.
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