Patent ID: 7758838
Filing Date: 2010-07-20
Classification: B01J,B82Y,C01B,C01G,C01P,Y10T

Abstract:
1. A method for making ultrafine particles, comprising: (a) introducing a precursor into a high temperature chamber comprising axially spaced inlet and outlet ends; (b) heating the precursor in the high temperature chamber, yielding a gaseous product stream; (c) passing the gaseous product stream through a converging member located coaxially at the outlet end of the high temperature chamber; and then (d) contacting the gaseous product stream with a plurality of quench streams injected into the high temperature chamber through a plurality of quench stream injection ports, wherein the quench streams are injected in a reduced diameter section and at flow rates and injection angles that result in the impingement of the quench streams with each other within the gaseous product stream, thereby producing ultrafine particles.