Reactor for bleaching high consistency pulp with ozone
AssigneeUnion Camp Patent Holding, Inc.
InventorsDavid E. White, Michael A. Pikulin, Thomas P. Gandek, William H. Friend
Life of this patent
Estimating the term…
Abstract
An apparatus and method for bleaching high consistency lignocellulosic pulp using ozone supplied in an ozone containing gas. The bleaching reactor apparatus according to the invention is a generally cylindrical vessel with a rotatable shaft having radially extending paddles arranged in a configuration to minimize axial dispersion of the pulp and maximize radial dispersion of the pulp to provide a radially dispersed plug flow of pulp through the reactor in the presence of the ozone to provide substantially uniformly bleached pulp.
Claims35
A bleaching apparatus for ozone bleaching of high consistency pulp particles, comprising a reactor apparatus including:
- high consistency pulp particles;
- an ozone containing gas;
- an elongated shell adapted to receive the pulp particles and ozone containing gas, said shell defining a pulp inlet and a pulp outlet;
- and
- means for conveying the high consistency pulp particles in a plug flow-like manner through said shell with said pulp particles being radially dispersed across substantially the entire cross-section of said shell to provide a radially dispersed, plug flow-like movement of pulp through the shell, said conveying means including rotating means and a plurality of paddle members which are spaced apart to provide an unswept distance of about 0.09 times the rotational diameter of the conveyor or less for conveying the pulp through the shall with a dispersion index of less than about 7.
Dependencies are inferred from the claim text.