Patent ID: 7820445

Claim:
A method of conducting a chemical process, comprising: flowing a gaseous stream carrying solid particulates through a microchannel; wherein the gaseous stream flowing through the microchannel has a Reynolds Number of at least 1000; wherein the microchannel comprising a flowing gas stream comprises a run up length; controlling operating conditions and microchannel dimensions or velocity of the gaseous stream carrying solid particulates through the microchannel such that the run up length, x H , is less than the microchannel length; wherein x H = 0.338 ⁢ ( H 2 ) 2 ⁢ ( U v ) wherein H is the smallest dimension (gap) of the microchannel, U=superficial velocity of the gas in the microchannel ν=dynamic viscosity of the gas in the microchannel; and conducting a chemical process in the microchannel.