DE55604C - Process for extracting oxygen from atmospheric air - Google Patents

Description

IMPERIAL

PATENT OFFICE.

Λ / V

The process that has hitherto been used for the production of atmospheric oxygen in a factory is known to be based on the property of the spongy barium oxide in a red-hot state, Take up oxygen and the same BEZW at a higher temperature. under the action to release a partial vacuum.

This Procefs, who has recently been very fully trained by the Brothers Bri η however, suffers from various shortcomings including its application to large-scale industry and to prevent it from spreading. The difficult representation of the spongy Baryts, its comparatively high price, is extraordinarily light Occurring devaluation by sintering together when using excessively high temperatures or through the formation of carbonate of barite when the retorts leak, etc. that for a rational operation it was extremely ingenious and comparatively complicated Apparatus are required, and is therefore a general introduction to this process hardly to be expected.

One method does not have these shortcomings; the same is due to the following reactions:

By bringing a mixture of lead oxide or in place of the other lead compounds, which upon heating give ¹ on the air lead oxide and alkaline earth in a glowing state in contact with air, then oxygen is absorbed; lead peroxide (Pb O ₂ J or lead acid salt (R, Pb OJ.

This process is known, studied in detail by Kafsner and described in patent no. 52459 protected.

Because the temperature at which the calcium plumbate restores the bound oxygen in the air given off, is much too high to be of technical use for the purpose of direct oxygen production To make this possible, Kafsner was forced to first use the Separate lead peroxide from the plumbate in order to then obtain the oxygen from this event to be able to.

The present innovation does not need this detour; it is based on the fact that the oxygen of the calcium plumbate and also of the others in patent no. 52459 Plumbate mentioned above is very easily driven out if one considers the same with weak Gaseous carbon dioxide treated with glowing heat.

The calcium orthoplumbate, as it is obtained according to the Kafsner's procedure, is best suited for the intended purpose, as it is responsible for driving out the oxygen absorbed carbonic acid is very easily deflated again with stronger glow and also very much is cheap to manufacture.

The following way is therefore suitable for obtaining the oxygen: The intimate mixture of lead oxide and alkaline earths, e.g. B. lime, is first in a retort in Annealed air flow and oxygen absorbed as a result. The temperature at which the The most complete exposure is very bright red embers. If you are at this time

Claims (1)

If air passes over the glowing plumbate, the oxygen becomes oxygen when it is sufficient long layer completely removed and pure nitrogen escapes. If the corresponding carbonic acid compounds have been used instead of the oxides, they will escape Nitrogen and carbon dioxide at the same time. If the glowing heat is correct, oxygen absorption is soon complete; it takes place at Application of the lime mixture, e.g. B. according to the equation: 2CaO + PbO + O = Ca ₂ Pb O ₄ . Now, after the oxygen uptake has ended, let the temperature in the retort be kept sink on dark red embers and now conducts carbonic acid over the plumbat formed, so one notices the following process: As soon as the carbonic acid penetrates, the part of the plumbate which lies next to the inlet pipe of the carbonic acid heats up as a result of the chemical reaction that takes place, and the progress of the CO ₂ can be observed very sharply by the gradual advance of the lighter glowing zone. At the same time, oxygen occurs at the other end of the retort, which is completely free of Is carbonated. The carbonic acid is only mixed with the oxygen at the moment when the reaction has advanced to the rear of the retort and the layer of the mixture present there has not more is enough to allow full absorption of the same. There is no here Doubts that in the said case one is dealing with a true chemical reaction, and that the carbonic acid in a dark red glow is calcium plumbate in the sense of the equation : Ca ₂ Pb O ₄ + 2 CO ₂ = 2 Ca CO ₃ + Pb O + O decomposed. The carbonic acid appearing at the end of the operation can very easily be removed from the oxygen be separated by the known absorbents, but it is better to interrupt the evolution of oxygen at the moment when the carbonic acid is at the point of introduction it shows opposite parts next to the oxygen. The mixture of carbonates remaining in the retort after the oxygen has been expelled and Oxyden is immediately brought back to a strong red heat and with air or for accelerated expulsion of the carbonic acid treated with a mixture of air and water vapor. This brings about the same reaction as in the beginning and can now the processes can be repeated as often as desired. The regeneration of what remains in the retort after the oxygen has been expelled Mixtures of alkaline earth carbonates and lead oxide (or lead carbonates) also offer the The advantage is that it is possible to recover most of the carbon dioxide required and to use for the Procefs. Other metal oxides than lead oxides can be used to obtain the oxygen in the specified Use wise; z. B. are the higher oxides of manganese, which when glowing the lower levels of oxidation this Metal can be formed with alkaline earths or by the wet route, likewise by the Carbonic acid can be decomposed, but the expulsion of the oxygen is not as easy as in the lead compounds. Patent claim: Process for the extraction of oxygen from atmospheric air, consisting therein that by annealing a mixture of lead oxide with alkaline earths (Patent No. 52459) or a mixture of manganese oxides with alkaline earths in an air stream bound in the air and then this oxygen becomes gaseous by passing a stream over it Carbon dioxide is expelled and collected again.