In the present study, extraction equilibria experiments for water + L(+)-tartaric acid + extractant/diluents were carried out at T = 300 +/- 1 K for concentrations of L(+)-tartaric acid (0.1 to 1.0 mol.kg(-1)) and Aliquat 336 (0.22 to 0.88 mol.kg(-1)) in various diluents (n-heptane, kerosene, n-octanol). The equilibrium results were discussed in terms of the overall equilibrium complexation constant (K-E(1:1)), loading ratio (z), extraction efficiency (E%), distribution coefficient (K-D), dimerization coefficient (D), and partition coefficient (P). Kerosene + 0.88 (mol.kg(-1)) Aliquat 336 was found to be a favorable solvent with 50% extraction efficiency for the reactive extraction of L(+)-tartaric acid, whereas, 32.14% for n-heptane + 0.88 (mol.kg(-1)) Aliquat 336, and 22.22% for 1-octanol + 0.88 (mol.kg(-1)) Aliquat 336. 1:1 acid-amine complex was proposed for all the diluents with no overloading, that is, z < 0.5. A higher chemical extraction was observed in nonpola.r diluents: n-heptane and kerosene. Further, equilibrium results were fitted with relative basicity and mass action law model and it was found that the relative basicity model predicted the results better than the mass action law for reactive extraction of L(+)-tartaric acid.