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Which evaporator is used to concentrate the dilute acid produced in wet process method by H2SO4 leaching?

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Which evaporator is used to concentrate the dilute acid produced in wet process method by H2SO4 leaching?

(a) Single effect evaporator

(b) Film evaporator

(c) Triple effect evaporator

(d) Circulation evaporator

The question was posed to me by my school teacher while I was bunking the class.

I'm obligated to ask this question of Inorganic Chemical topic in division Inorganic Chemical Industries of Chemical Technology

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Correct choice is (a) Single effect evaporator

Easy explanation: The dilute acid (phosphoric acid) produced in wet process by  H2SO4 leaching method is concentrated in a single effect evaporator up to 50%. Most of it is converted into high concentration chemical fertilizer.

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