Assertion: phosphoric acid's concentration | /r/HasProperty | effected in vacuum
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text: This method is characterized in that the concentration is effected in vacuum in an evaporator consisting of a surface-type heat transfer apparatus while the water vapor from the evaporation is collected by condensation in the concentrated sulfuric acid, and that the heat developed by the vapor condensation and by the sulfuric acid dilution is used for heating said evaporator by utilizing as a heating fluid the diluted sulfuric acid having absorbed the evaporated water.