Process for recovering turpentine and heat in connection with the evaporation of black lye
Abstract
Abstract TURPENTINE AND HEAT IS RECOVERED IN CONNECTION WITH THE EVAPORTION OF BLACK LYE EMERGING FROM A CONTINUOUSLY WORKING CELLULOSE DIGESTER UNDER HIGH PRESSURE AND AT HIGH TEMPERATURE. IN A FIRST STEP THE BLACK LYE IS CONCENTRATED IN TWO SUCCESSIVE EXPANSION TANKS AND IS THEREUPON FED INTO A MULTIPHAEE EVAPORATION APPARATUS OPERATED BY INDIRECT HEAT EXCHANGE AND FED WITH ADDITIONAL HEAT. THE LYE VAPORS FROM THE FIRST EXPANSION TANK ARE CONDUCTED TO THE FIRST EVAPORTION PHASE AND THE LYE VAPORS FROM THE SECOND EXPANSION TANK TO AN EVAPORATION PHASE SUCCEEDING THE SECOND EVAPORATION PHASE, WHEREUPON THE CONDENSATE IS COLLECTED AT LEAST FROM THOSE EVAPORATION PHASES TO WHICH THE LYE VAPORS FROM THE EXPANSION TANKS HAVE BEEN FED AND FINALLY TURPENTINE IS RECOVERED FROM THESE CONDENSATES IN KNOW MANNER. THE LYE CONDENSATES COMING FROM THE FIRST AND THIRD EVAPORTION PHASES MAY ADVANTAGEOUSLY BE COMBINED BEFORE RECOVERING TURPENTINE THEREFROM.
Inventors
- 👤 D Jafs
- 👤 B Hakulin
- 👤 T Marttala
- 👤 K Christiansen
Bibliographic Details
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