Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Including recovery of organic by-product
Patent
1977-04-04
1978-09-05
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Including recovery of organic by-product
162 47, 203 96, D21C 1106
Patent
active
041117433
ABSTRACT:
A method of recovering heat as well as fractions containing volatile alcohols and sulphur compounds from black liquor obtained from pulping. In a vapor generator, water is, by means of vapor, liberated at a high temperature and under a high pressure from the expansion of black liquor removed from a digester, indirectly vaporized into low-pressure vapor, which is used for vapor treatment of chips before their introduction into the digester. The condensate produced in the vapor generator is, under pressure control, passed into a condenser device, which is operated at a pressure that is lower than the pressure in the black liquor escaping from the digester, preferably at the atmospheric pressure. The condensate fraction formed in the condenser device as well as the uncondensed gas fraction are cooled by means of indirect cooling and the volatile alcohols and sulphur compounds are recovered from these fractions. Waste water, preferably secondary condensate from the evaporation plant, is used as the vaporization liquid in the vapor generator.
REFERENCES:
patent: 3432402 (1969-03-01), Herrlinger et al.
patent: 3807479 (1974-04-01), Brannland et al.
Bashore S. Leon
Smith William F.
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