present in the proportion of about 40 percent by weight of the mixture the electrode to separator gaps for both anode and cathode were 0 040 inches to 0 060 inches the cell was operated under the following test conditions 1 07 amps per square inch total cell amperage was 193 amps a head pressure of 12 inches was maintained on the anode side of the cell the anode feed rate was 123 milliliters per minute the anode overflow rate for the spent hemicellulose solution was 103 milliliters per minute the anode feed was 63 grams per liter of sodium hydroxide and 16 to 18 grams per liter equilibrium concentration in the anode compartment the cathode feed was deionized water which was fed at a rate of about 16 milliliters per minute the cathode overflow was about 36 milliliters per minute a sodium hydroxide equilibrium concentration in the cathode compartment of 160 to 170 grams per liter was obtained electrolyte recirculation in both compartments of the cell was obtained by gas lift only the cell was operated at a temperature of 55 u00b0 to 60 u00b0 c by providing cooling utilizing a cooling coil in a cathode gas disengager tank the temperature differential across the separator was about 5 u00b0 c in a second experiment utilizing the above cell the cell anolyte was electrolyzed to obtain a concentration of 10 grams per liter of sodium hydroxide with no hemicellulose precipitate being formed in the cell while operating at a cell temperature of 55 u00b0 to 60 u00b0 c when the anolyte solution was removed from the cell allowed to stand and cool a white precipitate formed this precipitate settles to occupy a volume of about 66 percent of the original volume of the solution upon.