Process for the treatment of pulp with oxygen and steam using ejectors
AssigneeAir Products and Chemicals, Inc.
InventorsJohn Frederick Cirucci, Jeffrey Alan Knopf, Vincent Louis Magnotta, William Paul Schmidt
Life of this patent
Estimating the term…
Abstract
A process for using ejectors to combine high pressure steam and low pressure oxygen to produce a steam and oxygen enriched gas single phase gas mixture for introduction into various pulp treatments using oxygen with the benefit of low cost compression, low capital requirements and superior oxygen mixing.
Claims17
A process for the elevated pressure oxygen treatment of pulp at elevated temperature and pressure in which high pressure steam, as a motive fluid, is premixed with low pressure oxygen enriched gas, as a suction fluid, in an ejector to elevate the pressure of said oxygen enriched gas and the resulting steam and oxygen enriched single phase gas mixture, at an elevated pressure intermediate to said high and low pressure, is introduced into the pulp to provide a high dispersion of intermediate pressurized oxygen in the pulp and to effect an enhanced oxygen treatment of the pulp.
A process for the elevated pressure oxygen treatment of pulp at elevated temperature and pressure in which high pressure steam, as a motive fluid, is premixed with low pressure oxygen enriched gas, as a suction fluid, in a first ejector to elevate the pressure of said oxygen enriched gas and a portion of the resulting steam and oxygen enriched single phase gas mixture, at a first intermediate elevated pressure to said high and low pressure, is introduced into the pulp to provide a high dispersion of oxygen in the pulp and to effect an enhanced oxygen treatment of the pulp and a second portion of said resulting mixture is cooled and a portion of the steam is condensed from said second portion and said second portion is mixed with additional high pressure steam in a second ejector to result in a second higher intermediate elevated pressure steam and oxygen enriched gas mixture which is introduced into a pulp at said second higher intermediate pressure to provide a high dispersion of elevated pressure oxygen in the pulp and to effect an enhanced oxygen treatment of the pulp.
Dependencies are inferred from the claim text.