Patent ID: 6913381
Filing Date: 2005-07-05
Classification: B01F,B01J,B41M

Abstract:
1. A process for mixing a plurality of chemical solutions, the process comprising the steps of: preparing an in-line mixing apparatus comprising: a mixing apparatus main body, including a plurality of injection inlets and at least one discharge outlet, the plurality of chemical solutions being injected at the injection inlets, the plurality of injection inlets including an upstream injection inlet and at least one downstream injection inlet which are separately disposed; a mixing flow path formed inside the mixing apparatus main body, which communicates with the plurality of injection inlets and the discharge outlet; a rotary blade disposed in the mixing flow path between a vicinity of the downstream injection inlet and the discharge outlet for mixing the plurality of chemical solutions injected at the injection inlets, the rotary blade including a rotation shaft; and at least one of a shaft sealing portion and a mechanical seal disposed at the rotation shaft of the rotary blade for sealing the rotation shaft, the at least one of a shaft sealing portion and a mechanical seal being disposed at a downstream side of the upstream injection inlet and being disposed at an upstream side of the downstream injection inlet, wherein a chemical solution injected at the upstream injection inlet forms a flow alone the mixing flow path from the upstream injection inlet to the discharge outlet, and further comprising a reverse flow preventing mechanism disposed in the mixing flow path between the at least one of a shaft sealing portion and a mechanical seal and the rotary blade, wherein the reverse flow preventing mechanism comprises from 2 to 10 weir plates disposed to reduce cross-sectional area of the mixing flow path and wherein the length of the weir plates becomes larger toward the downstream side of the mixing flow path; and supplying one of the chemical solutions to the downstream injection inlet disposed at a downstream side of the shaft sealing portion or mechanical seal, the one of the chemical solutions having reactivity with at least one other of the chemical solutions.