Question: sodium hydroxide solution is to be concetrated from 4% to 40% by mass in double effect reverse feed evaporator. saturated steam is available at gauge

sodium hydroxide solution is to be concetrated from 4% to 40% by mass in double effect reverse feed evaporator. saturated steam is available at gauge pressure of 0,36 bar , and the condenser which condensese the vapour to second effect can maintaine a vacuum at gauge pressure of 0,89 bar. the evaporators are to identical

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