DE202778C - - Google Patents

Description

(.OKJ ₁ MfIl) Il ί ν I
-. 'S! ill I

PATENT LETTERING

- M 202778 CLASS GROUP Mg.

LAIR LIQUIDE

in Paris.

Patented in the German Empire on June 3, 1904.

The invention relates to a device for separating atmospheric air into it Components by means of liquefaction. The procedures used for this essentially exist in liquefying all the compressed and cooled air to be treated in a homogeneous liquid, which is formed from the liquid oxygen obtained during the decomposition. The liquid is evaporated, and the vapors obtained in this way provide the gaseous oxygen, which is used to rectify the liquefied air. the Rectification is preferably effected by means of intimate contact between the gases and the liquid air, with each touch the gas successively layers the sweeps through fluids to be rectified. Of the devices that are used to exercise Such methods were used, the subject matter of the invention differs in that the device consists essentially of a rectification column and a single Evaporation vessel consists, which with an exhaust pipe for the gaseous oxygen is provided and part of it is forwarded for further use while the remaining part of the gaseous oxygen is used to rectify the Bring about air.

The drawing shows schematically an embodiment of such a device.

M is an evaporator which contains a tube bundle or a coil 5. The top of the evaporator is followed by a rectification column A , which is provided with a suitable number of perforated plates p, p , which are connected to one another by overflow pipes. The column A communicates with the evaporator M through the overflow pipe N. The coil S continues in a pipe T which runs the entire length of the column and extends over the top plate of the column, the outlet of which is through a valve i? is regulated.

The operation of the device is as follows:

The compressed air cooled in the heat exchange devices enters through tube t ¹ , flows through the coil S ″ surrounded by liquid oxygen and liquefies there with evaporation of a corresponding amount of liquid oxygen.

A portion of the liquid thus converted into gas in compartment M is conveyed away from the device through pipe t ^s , the tap h regulating the amount of oxygen to be withdrawn. As usual *, this gas goes through a heat exchanger, where it cools some of the air to be separated.

Claims (1)

Another part of the oxygen produced by evaporation in Department M goes through Hahn k? through into the line t ² provided with bores and from here into the liquid stored on the lowest plate of the column, from where the gas rises into the actual rectification column. Instead of this facility one can also connect the department M with ίο the column A by opening the liquid seal provided at C (through the immersion tube N) , so that the desired amount of oxygen can be obtained in this way. enters the column, the regulation taking place automatically by the amount of oxygen passed through valve h and tube t ^3. The air liquefied in S is transported by the its own pressure is passed through tube T and valve R to the top plate of the rectification column, from where it flows down through the overflow tubes onto the plates below. The gases rising from the bottom to the top pass through the liquids on the plates and rectify the flowing liquid through the gas exchange in such a way that it gradually becomes richer in oxygen, whereas the gases, conversely, become richer in nitrogen the further they rise upwards. On the bottom plate of the column there is therefore liquid oxygen, which enters the evaporator M through the overflow pipe N , and on top a gas which, according to the vapor tensions of oxygen and nitrogen at a ratio of 21:79 percent, only 7 percent Has oxygen. This gas is passed on through E and collected after it has cooled most of the air to be separated in the heat exchangers. The cold losses occurring in the device are compensated in the usual way, either by placing a certain amount of liquid on the top plate of the column Air from a special source is added, or by adding the air to be decomposed an increased pressure and then this before entering the rectification column relaxed, expedient with simultaneous performance of external work. The procedure described can be combined with other air separation processes in which liquid nitrogen or nitrogen-rich liquids are used to complete the rectification of the liquid air. Also one can yorgekühlte atmospheric air at one point i ⁴ where the rising gases have the same composition as atmospheric air blow into the rectification column. The method described above offers inv in contrast to the known method where the oxygen from the rectification evaporates in several separate containers will have certain advantages. The devices become significantly simpler and fewer expensive, since you can do without the sensitive control equipment. With the devices with two evaporators, the liquid level is continuous due to the transfer of liquids into the evaporators Subject to fluctuations. As a result, the heating surface of those submerged in the liquids of the evaporators fluctuates Liquefaction tube bundle, which is why the amounts of the introduced into each of the tube bundles Air must regulate accordingly. With a single vaporizer, this tedious work is eliminated by itself and the operation of the device becomes easier and also more smooth and is better to monitor. PateNT-AνSPRUcη: Device for breaking down atmospheric air into oxygen and nitrogen by means of liquefaction and rectification, characterized in that the complete Evaporation of the oxygen-rich liquid resulting from the rectification takes place in a single container and part of the vapors thus formed in the rectification column, the remaining part is derived from the device. For this purpose ι sheet of drawings. Berlin. Printed in the ReichsdruckereI.