PURPOSE: To produce simply dispersed superfine particles uniform in the particle shape and particle diameter at a low cost by performing a hydrolysis reaction and the growth of the produced particles after the hydrolysis in a Couette.Tiller vortex flow type reactor, when a metal alkoxide is hydrolyzed.
CONSTITUTION: A Couette.Tiller vortex flow type reactor 5 comprising a coaxial double cylindrical reactor composed of an outer cylinder 7 and an inner cylinder 8 whose central axes are common is arranged. The metal alkoxide and other raw materials needed for the hydrolysis are received in raw material solution tanks 1 and 2, fed into a mixer 4 through constant volume pumps 3 respectively, and mixed with each other. The raw material mixture is fed into a space between the outer cylinder 7 and the inner cylinder 8 of the reactor 5. The outer cylinder 7 is made to stand still, and the inner cylinder 8 is rotated to form a Couette.Tiller vortex flow, thus hydrolyzing the metal alkoxide. After the hydrolysis reaction the produced particles are further allowed to grow in the reactor 5, and the produced superfine particles are recovered into a recovery container 6. The obtained superfine particles are suitable as a ceramic raw material, an adsorbent, etc.
YANAGAWA TERUAKI
OGAWA KENJI
NAGATA NORIFUMI
IGUCHI MASAHITO
OGIWARA TAKASHI