The isolation of pulp from pine wood with trifluoroacetic acid as organic solvent has been studied. The process has been carried out in mild conditions: the temperature 40-60°C, the time of cooling 3-6 h, and atmosphere pressure. The dependence of the pulp yield upon the modulus, temperature, and time of delignification has been shown. The optimal modulus is 30. When the temperature of the process and the time has been increased respectively to 60°C and 6-7 h, the yield of unbleached pulp has been increased too, but the quality parameters has been decreased.