time ranges from 1 30 minutes preferably from 5 20 minutes after applying these operating conditions a yield close to 50 is obtained after the reaction a solution is obtained that contains two phases tall oil 5 and brine 6 that comprises sodium sulphate lignin and calcium sulphate to achieve a good phase separation the solution must undergo a centrifugation process at a speed from 1 300 and 1 800 rpm during 1 30 minutes preferably from 2 20 minutes the properties that must be maintained for both tall oil and brine to ensure a optimum tall oil are brine ph which can range from 2 0 5 0 preferably from 3 0 4 0 in the tall oil case the heating value must be from 8 000 10 000 kcal kg preferably from 9 000 9 500 kcal kg and the temperature must range from 50 80 u00b0 c to maintain the viscosity under these conditions the formation of ashes is prevented which ensures a good separation of the phases after centrifugation thus it is possible obtaining tall oil from a by product generated in the process of production of chlorine dioxide which allows producing tall oil with suitable properties to be used as a fuel under certain operating conditions the process to produce tall oil from the reaction between sodium sesquisulfate and tall oil soap is described below we proceeded to carry out a test of crystallization in sodium sesquisulfate solutions at different percentages by weight from 30 to 40 table n u00b0 1 shows the results obtained the highest temperature of crystallization was obtained for a sodium sesquisulfate solution concentration of 39 therefore at this concentration the reaction for obtaining tall oil was carried out once the concentration of solution was obtained we.