75％硫酸の降膜蒸発における85～86％熱交換面積の算出
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75％硫酸を降膜蒸発させて85～86％にし、熱交換部は2段式とし、上段では蒸気で加熱する（蒸気圧10Kg、温度200℃）、下段では水冷する。入口温度は常温、出口温度は60℃。 流量はそれぞれ：2トン/時、4トン/時、6トン/時
エネルギー消費が高すぎて割に合わない。濃硫酸や発煙硫酸を使って調整した方が良い
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