Method for controlling the alkalinity of feed circulation when p

Details Method for controlling the alkalinity of feed circulation when p Method for controlling the alkalinity of feed circulation when p

1983-02-02

1984-06-26

Griffin, Ronald W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

162 36, 162 45, 162 83, 162 84, 162DIG2, D21C 306, D21C 326, D21C 104

Patent

active

044567502

ABSTRACT:
A method for controlling the pH of the liquid circulation in a continuous prehydrolysis apparatus where a mineral acid or some other acid stronger than sulfurous acid is used as a hydrolysis agent and the material to be hydrolyzed is transferred, entrained in the liquids of a first and a second liquid circulation separated by a liquid exchanger, from a steaming vessel to a hydrolysis vessel by means of a transfer valve. Such an amount of alkaline sulfite or ammonium sulfite is added into the liquid of the first liquid circulation as is necessary to make the liquid alkaline or at least neutral.

REFERENCES:
patent: 1891337 (1932-12-01), Seaman
patent: 3262839 (1966-07-01), Luthgens
Pulp and Paper Manufacture, Second Edition, vol. 1, The Pulping of Wood, MacDonald, Editor, McGraw-Hill Book Company, N.Y., N.Y., 1969, pp. 428-435, 439-443, 471-478, 763 and 764.

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