Filtration systems and methods
AssigneeUltraCell Corporation
InventorsRu Chen, Franklin Paul Barcinas, Ian W. Kaye
Life of this patent
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Abstract
Filtration systems and methods for purifying windshield washer fluid to yield methanol pure enough for fueling methanol fuel cell systems. Pumping commercially available windshield washer fluid through filtration systems having one or more filters can remove additives from the windshield washer fluid. The filtration systems include filters, such as activated carbon filters, nanofiltration filters, reverse osmosis filters, and ion exchange resin filters.
Claims22
A purified windshield washer fluid having evaporation residue less than 1000 ppmW, wherein the purified windshield washer fluid is produced by a process comprising the steps of:
- providing a windshield washer fluid comprising methanol and at least one other compound, wherein a concentration of the methanol is 50 wt % or higher;
- and
- passing the windshield washer fluid through a filtration system comprising at least one filter, wherein the at least one filter is selected from the group consisting of:
- an activated carbon filter, a membrane separation filter, and an ion exchange resin filter, wherein the windshield washer fluid contains 1.3 wt % 2-butoxyethanol and the purified windshield washer fluid contains 0.31 wt % 2-butoxyethanol.
A purified windshield washer fluid having evaporation residue less than 1000 ppmW, wherein the purified windshield washer fluid is produced by a process comprising the steps of:
- providing a windshield washer fluid comprising methanol and at least one other compound, wherein a concentration of the methanol is 50 wt % or higher;
- and
- Passing the windshield washer fluid through a filtration system comprising at least one filter, wherein the at least one filter is selected from the group consisting of:
- an activated carbon filter, a membrane separation filter, and an ion exchange resin filter, wherein the windshield washer fluid contains 1.3 wt % 2-butoxyethanol and the purified windshield washer fluid contains 0.26 wt % 2-butoxyethanol.
A purified windshield washer fluid having evaporation residue less than 1000 ppmW, wherein the purified windshield washer fluid is produced by a process comprising the steps of:
- providing a windshield washer fluid comprising methanol and at least one other compound, wherein a concentration of the methanol is 50 wt % or higher;
- and
- passing the windshield washer fluid through a filtration system comprising at least one filter, wherein the at least one filter is selected from the group consisting of:
- an activated carbon filter, a membrane separation filter, and an ion exchange resin filter, wherein the windshield washer fluid contains 1.3 wt % 2-butoxyethanol and the purified windshield washer fluid contains 0.26 wt %-0.31 wt % 2-butoxyethanol.
A purified windshield washer fluid having evaporation residue less than 1000 ppmW, wherein the purified windshield washer fluid is produced by a process comprising the steps of:
- providing a windshield washer fluid comprising methanol and at least one other compound, wherein a concentration of the methanol is 50 wt % or higher;
- and
- passing the windshield washer fluid through a filtration system comprising at least one filter, wherein the at least one filter is selected from the group consisting of:
- an activated carbon filter, a membrane separation filter, and an ion exchange resin filter, wherein the windshield washer fluid contains 2-butoxyethanol and a mass fraction of the 2-butoxyethanol in the purified windshield washer fluid contains about 20%-23.8% of a mass fraction of 2-butoxyethanol in the windshield washer fluid before passing the windshield washer fluid through the filtration system.
Dependencies are inferred from the claim text.