Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1980-10-06
1982-06-22
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 36, 210670, 210928, 423356, 423DIG3, D21C 1102
Patent
active
043361021
ABSTRACT:
A method for recovering ammonia from spent ammonia-base sulfite pulping liquor includes steam stripping spent ammonia and condensing the resulting vapor to produce a dilute ammonia or ammonium hydroxide solution. This dilute solution is passed through a cation exchange column to produce an ammonium sulfite-ammonium bisulfite solution which is delivered to a sulfur dioxide absorption tower to thereby produce a concentrated ammonia-base sulfite cooking liquor. The residual liquor from the stripping step and the non-condensable gases are burned as fuel and the waste gases from this burning, which contain a small percentage of sulfur dioxide, are delivered to the absorption tower and subsequently discharged to the atmosphere free of sulfur dioxide and ammonia.
REFERENCES:
patent: 2736635 (1956-02-01), Haywood
patent: 2778714 (1957-01-01), Kasper et al.
patent: 2947656 (1960-08-01), Bailey
patent: 3095265 (1963-06-01), Effer et al.
Bozzuto Carl R.
Jacobs Lawrence J.
Alvo Steve
Combustion Engineering Inc.
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