LIQUID-LIQUID EXTRACTION IS A UNIT OPERATION FREQUENTLY EMPLOYED IN THE PHARMACEUTICAL INDUSTRY, AS IN MANY OTHERS, FOR RECOVERY AND PURIFICATION OF A DESIRED INGREDIENT FROM THE SOLUTION IN WHICH IT WAS PREPARED [1]. IN RECENT YEARS, NANOFLUIDS AS NEW ENGINEERING MATERIALS THAT HAVE HIGH POTENTIAL FOR USE IN INDUSTRIAL PROCESSES HAS BEEN INTRODUCED. FINITE STUDIES HAVE BEEN DONE FOR THE EFFECT OF THESE SUBSTANCES ON THE HYDRODYNAMICS AND MASS TRANSFER IN LIQUID-LIQUID SYSTEMS.IN THIS RESEARCH WORK, THE EFFECT OF SILICA NANOPARTICLES ON SOLUBILITY OF SUCROSE IN TERNARY SYSTEM WATER - N-BUTANOL- SUCROSE HAS BEEN STUDIED. N-BUTANOL AS A SOLVENT AND THE DEIONIZED WATER INCLUDING CONSTANT CONCENTRATION HYDROPHILIC SILICA NANOPARTICLES AS THE CONTINUOUS PHASE WERE SELECTED. SILICA NANOPARTICLES WITH THE SIZE RANGE OF 10-15 NM WAS USED TO PREPARE NANOFLUID. IN ORDER TO PREPARE NANOFLUIDS, 0.004 WEIGHT PERCENTS SILICA NANOPARTICLES WERE DISPERSED IN DIONIZED WATER USING ULTRASONIC SYSTEM [2]. THE RESULTS SHOWED THAT ADDING NANOPARTICLES TO SIMILAR SYSTEMS, SOLUBILITY OF SUCROSE IN BOTH EXTRACT AND RAFFINATE PHASES HAS INCREASED. WITH INCREASING SUCROSE FROM 1, 2, 4 TO 12.5 G IN TERNARY SYSTEM, PERCENT OF SOLUBILITY IN RAFFINATE AND EXTRACT PHASES INCREASED BY 4.3 - 7.21% AND 40.6 -16.5%, RESPECTIVELY.