Abstract:  It appears that the stirring intensity effect on the relative proportion of α in the presipitate is very remarkable. If stirring intensity (Re) is below 10000, the nucleation rate 0f Q increase relative1y with an increase in stirring intensity. The mechanism is that the kinetic coefficient and the nucleation rate of second nuclei of α increase relatively with an increase in stirring intensity. But beyone the 1imit, the proportion of 5 in the precipitate increase slithly with an increase in stirring instensity. And the fender-board is favorable for nucleation of α.The new mothed, nucleation with strong stirring and growth with wear stiring, is fav0rable f0r larger and more uniform crastals (α) during the crystallization process of L-glutamic acid without seed crystals added.

Key words: Glutamic Acid, Crystallization, Stir, Polymorph