Distillation: processes – separatory – Adding material to distilland except water or steam per se – Organic compound
Reexamination Certificate
2005-02-01
2005-02-01
Manoharan, Virginia (Department: 1764)
Distillation: processes, separatory
Adding material to distilland except water or steam per se
Organic compound
C203S074000, C570S136000, C570S153000, C570S178000
Reexamination Certificate
active
06849163
ABSTRACT:
There is provided a process for recovering tetrafluoroethylene wherein an amount of energy required to obtain TFE is reduced.In the process for producing a TFE mixture as an intended mixture which contains TFE at a higher concentration from a raw material mixture (10) which contains TFE, a component of which boiling point is lower than that of TFE and a component of which boiling point is higher than that of TFE,(1) the raw material is subjected to a preliminary distillation treatment (12) so as to obtain (a) a first fraction (15) which contains at least a portion of the component of which boiling point is higher than that of TFE and (b) a second fraction (14) as the balance which contains TFE and the component of which boiling point is lower than that of TFE, and then(2) the second fraction is subjected to a main distillation treatment (16) so as to obtain (c) a third faction (20) formed by distilling off the component of which boiling point is lower than that of TFE, and (d) a fourth fraction (18) as the intended mixture being the balance which contains TFE.
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Homoto Yukio
Yoshii Shigeyuki
Daikin Industries Ltd.
Manoharan Virginia
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