Closed loop system for the elimination of fluorine pollution from phosphoric plants专利检索-闭环系统地热循环地热能专利检索查询-专利查询网

Closed loop system for the elimination of fluorine pollution from phosphoric plants

阅读：509发布：2022-03-06

专利汇可以提供Closed loop system for the elimination of fluorine pollution from phosphoric plants专利检索，专利查询，专利分析的服务。并且A process for recovering fluorine compounds from the evaporative concentration of aqueous phosphoric acid, without atmospheric pollution, is disclosed, wherein the vapors produced by concentrating aqueous phosphoric acid solution are condensed by contacting same in a system closed to the atmosphere with an aqueous fluorine-compound-absorbing liquid, with said aqueous liquid being cooled by indirect heat exchange and then recycled to condense additional vapors. The prior art required cooling water ponds or the like and such ponds are eliminated by the present process, with the consequential elimination of fluorine pollution of the atmosphere.，下面是Closed loop system for the elimination of fluorine pollution from phosphoric plants专利的具体信息内容。

权利要求

2. A process for recovering fluorine compounds from vapors containing water vapor and fluorine compounds as claimed in claim 1, said process comprising: a. condensing said vapors by contacting same in at least one condenser with an aqueous liquid at a temperature of about 70*F. to about 140*F., to form a condensate of said aqueous liquid and condensed vapors, b. thereafter concentrating the condensate bY vacuum concentration, at a temperature of about 90*F. to about 170*F. and at a pressure of about 2 inches of mercury to about 9 inches of mercury, to produce a fluorosilicic acid solution containing at least 15 percent by weight of fluorosilicic acid, and vapors containing mainly water vapor, c. recycling at least a portion of said fluorosilicic acid solution to the condenser of step (a), and d. condensing the vapors from said vacuum concentration by contacting same with a second aqueous liquid in a closed loop system isolated from the atmosphere, said second aqueous liquid being at a temperature of about 80*F. to about 100*F., with cooling and at least partial recycling of said aqueous liquid, wherein the cooling is by indirect heat exchange while maintaining said aqueous liquid in said closed loop system isolated from the atmosphere, whereby atmospheric pollution is avoided.

3. Process as claimed in claim 2, wherein the vapors are condensed in step (a) in a plurality of condensers.

4. Process as claimed in claim 2, wherein the second aqueous liquid of step (d) is at a temperature of about 90*F.

5. A process for the recovery of fluorine compounds from vapors containing water vapor and fluorine compounds as claimed in claim 1, said process comprising: scrubbing said vapors with an aqueous fluorine-compound-absorbing liquid at an elevated temperature which is substantially the temperature of said vapors, said aqueous fluorine-compound-absorbing liquid being capable of absorbing said HF and SiF4 to form a fluorosilicic acid solution having a concentration of at least 15 percent by weight, while substantially avoiding the condensation of water vapor, to produce a solution of fluorosilicic acid in said aqueous fluorine-compound-absorbing liquid, and condensing the vapors from said scrubber in a condenser by contacting same with a second aqueous liquid at a temperature at least 20*F. less than the temperature of said vapors and below the saturation vapor temperature of said vapors to produce a condensate containing substantially all water vapor in said vapors, with cooling and recycling of said condensate, wherein the cooling is by indirect heat exchange while maintaining said condensate in said closed loop system isolated from the atmosphere, whereby fluorine vapor atmospheric pollution is eliminated.

6. Process as claimed in claim 5, wherein said vapors from the aqueous phosphoric acid concentration are at a temperature of about 126*F. to about 180*F.

7. Process as claimed in claim 5, wherein said second aqueous liquid has a temperature of less than 100*F.

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Closed loop system for the elimination of fluorine pollution from phosphoric plants

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