Abstract: An apparatus for concentrating polyvinyl alcohol liquid which comprises a supply line for supplying a liquid containing polyvinyl alcohol, a filter in connection with the supply line for filtering foreign materials from the liquid, a first tank for receiving the liquid after the liquid is passed through the filter, a preliminary mixing apparatus in fluid connection with the first tank, an evaporator in fluid connection with the preliminary mixing apparatus, the evaporator including a plurality of pipes through which the liquid may flow, a steam heating assembly in connection with the evaporator for heating the liquid flowing through the plurality of pipes, a second tank in fluid connection with the evaporator, the second tank receiving the liquid from the plurality of pipes within the evaporator, a return pipe in fluid connection with the second tank for returning liquid contained within the second tank to the preliminary mixing apparatus such that the liquid may be combined within the preliminary mixing appa