| 摘要 |
PROBLEM TO BE SOLVED: To improve safety characteristic in an air separating process and reduce a size of phase separator. SOLUTION: A liquid flow 33 extracted from a bottom part of a low pressure refining tower 12 is increased in its pressure by a pump 34 (a flow 35), thereafter the flow is fed into a main heat exchanger 9 and partially gasified in it. This flow 39 partially gasified is then fed into a phase separator 37, A flow 40 of gas discharged out of the phase separator 37 is heated in the main heat exchanger 9 and then recovered as product. Liquid 36 discharged out of the phase separator 37 is divided into two flows, its first portion 51 is merged into the flow of liquid 35 coming from the low pressure refining tower 12 before the main heat exchanger 9. The second portion 52 is extracted as a product or purged out before a point where it is merged into the flow of liquid.
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