1 Optimization of the Process of Synthesis of Lignin–Tannin-Formaldehyde Organic Aerogels Nadezhda M. Mikovaа а Liudmila I. Grishechkoа , Boris N. Kuznetsov*а,b , Institute of Chemistry and Chemical Technology SB RAS FRC “Krasnoyarsk Science Center SB RAS” 50/24 Akademgorodok, Krasnoyarsk, 660036, Russia b Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041 Russia Received 27.03.2015, received in revised form 15.05.2016, accepted 02.06.2016 The method of experimental statistical analysis was applied to study the effect of concentration of lignin (X1 ) and the pH of the reaction solution (X2 ) on the values of specifi c parameters of the porous structure obtained organic lignin-tannin-formaldehyde (LTF) aerogels. <...> Mathematical models relating the basic dependence of initial variables X1 and X2 performance of porosity (meso- and macropore volume) in LTF organic aerogels were obtained. <...> Based on the evaluation of the mathematical model it was established that for Х1 = 40,0 % and Х2 maximum predicted value of the specifi c surface area of obtained organic aerogels is587 m2 factors Х1 = 30 %, and Х2 = 2,54, the maximum value of the pore volume is about 2,16 cm3 with the predicted conditions to achieve the best = 2,2 the /g. <...> Predicted optimal conditions to achieve the maximum values of surface area and pore volume were consistent with the experimental results, that determines the feasibility of their using to predict the results of synthesis of LTF aerogels with desired structural characteristics. <...> All rights reserved * Corresponding author E-mail address: inm@icct.ru # 212 # Liudmila I. <...> Optimization of the Process of Synthesis of Lignin <...>