APPARATUS FOR PRODUCING HIGH-FREQUENCY NITROGEN GAS

WIPO Patent Application WO/1986/000693

A1

Apparatus for producing nitrogen gas of a super-high purity by subjecting air to supercooling, liquefaction and separation. It is an object of this invention to obtain an apparatus for producing nitrogen gas of a super-high purity, which does not require an expensive expansion turbine which frequently malfunctions. The apparatus according to the present invention is formed by connecting a liquid nitrogen storage means (23) via a first introduction passage (24a) to a fractionating tower (15), into which the outside air is introduced in the form of chilled, compressed raw air via an air-compressing means (9) and heat exchange means (13), (14); and this storage means (23) to the heat exchange means (13), (14) via a second introduction passage (24b). The raw air is cooled to a supercooled temperature by the heat loss in the evaporation of liquid nitrogen, and this air of a supercooled temperature is further cooled by the heat loss of evaporation of liquid nitrogen in the fractionating tower (15). The nitrogen is recovered in the liquid phase, and the oxygen is left in the liquid phase, by utilizing the difference between the boiling points thereof. The nitrogen gas thus obtained is mixed with the gasified liquid nitrogen from the liquid nitrogen storage means (23) to form the finished product, nitrogen gas.

YOSINO AKIRA (JP)

PCT/JP1985/000385

January 30, 1986

July 08, 1985

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DAIDO OXYGEN (JP)

F17C9/04; F25J3/04; (IPC1-7): F25J3/04

JPS5047882A	1975-04-28
JPS55118568A	1980-09-11
JPS4011724B1
JPS5525344B1	1980-07-05

"Zeolite to Sono Riyo" Hinshu Iinkai-Hen, "Zeolite to Sono Riyo" 1 December 1967 (01.12.67), GIHODO p. 165-165
See also references of EP 0190355A4

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