Multistage evaporating system

Details Multistage evaporating system Multistage evaporating system

1989-06-14

1990-09-04

Manoharan, Virginia

Concentrating evaporators

Film type

Moving film

159 173, 159 174, 159 18, 159 201, 159 273, 159 49, 159DIG8, 162 3011, 162 47, 202174, 202236, 203 88, 203 89, 165115, B01D 122, B01D 126

Patent

active

049536079

ABSTRACT:
A thermal system includes a plurality of heat exchangers in series and the same number of flash tanks in series is interposed between two subsequent effects of a multiple effect evaporating system for sulfate black liquor. The liquor is indirectly heated in the heat exchangers by vapor produced by step-by-step expansion of the same liquor in the flash tanks and additionally by steam from an external source. To decrease the viscosity of the black liquor it is heated to a temperature of 190.degree.-200.degree. C. and retained in a reactor vessel for 10-20 minutes.
Preferably the flash tanks and the heat exchange elements are positioned on top of each other within a shell to form an integral construction in which the vapor compartment of each flash tank is directly connected to the vapor compartment of a corresponding one of the heat exchange elements.

REFERENCES:
patent: 2934477 (1960-04-01), Siegfried
patent: 3249517 (1966-05-01), Lockman
patent: 3303106 (1967-02-01), Standiford
patent: 3839160 (1974-10-01), Izumi
patent: 3941663 (1976-03-01), Steinbruchel
patent: 4292135 (1981-09-01), Klaren
patent: 4334954 (1982-06-01), Lagana et al
patent: 4441958 (1984-04-01), Teucci
patent: 4511436 (1985-04-01), el Din Nasser
patent: 4789428 (1988-12-01), Ryham
patent: 4884767 (1975-05-01), Pottharst, Jr.

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