Acid concentrating and recovery system

Claim 1

System for concentrating and recovering acid comprising in combination: a. a receptacle or storage tank for receiving and containing weak or dilute acid; b. an evaporating pan including a pipe connected to said receptacle or storage tank and a pump whereby acid may be delivered to said evaporating pan; c. a second receptacle or storage tank including a pipe connected to said evaporating pan and a pump whereby concentrated acid may be delivered to said second receptacle or storage tank; and d. an air drier device in the form of a tank containing acid and including an inlet through which a mixture of air, acid, and water vapor may be introduced, and a pipe connecting said air drier device to said tank for weak or dilute acid and to a pump operable to deliver weak acid to the weak acid tank; wherein the concentration of the acid of said mixture is increased in said air drier device by separation and removal of some water vapor from the mixture and said evaporating pan includes a heat collecting surface as a floor thereof and a lens focus top whereby heat energy from the sun's rays will heat and concentrate the acid therein by developing water vapor which is removed with air.

Claim 5

The system as defined in any one of claims 1, 2, or 3, wherein one or more tubular passages, having openings to the atmosphere, pass through said receptacle or storage tank for weak or dilute acid in heat exchange relationship with acid therein whereby an auxiliary or preliminary concentration of the acid may be effected.