DE810503C - Process for the separation of carbon monoxide from a gas mixture containing carbon monoxide and nitrogen monoxide - Google Patents

Description

(WiGBl. P. 175)

ISSUED AUGUST 9, 1951

p 26429 IVb 112 e D

The method according to the present invention relates to the separation of carbon monoxide from a gas mixture containing carbon monoxide and nitrogen monoxide.

It is known that carbon monoxide can be separated from a gas mixture by possibly absorbed under pressure by means of an acidic or ammoniacal cupro salt solution. In this case, however, because of the reduction to nitrogen, there is considerable loss of nitrogen monoxide calculate.

The also known method for converting carbon monoxide into carbon dioxide by means of Steam requires gas mixtures with a fairly large hydrogen partial tension, because of this necessary conversion catalysts (cf. the relevant patents in J. Schmidt, Das Kohlenoxyd, Leipzig 1935, pp. 59 to 60) are only effective in this case, and this method adheres also the disadvantage that not only carbon monoxide but also nitrogen monoxide is oxidized.

Finally, one could free the gas mixture from the carbon monoxide by doing it, if necessary after the separation of any carbon dioxide that may be present, bring it to a high temperature in order to carry out the conversion in accordance with the reaction equation

2 CO + 2 NO >

to accomplish. There

2 CO ₂ + N ₂
d

_{2 2}
but from the

investigations of Musgrave and descending Elwood (see. J. Chem. Soc. 1933, p 56 to 59) is known that this reaction proceeds only at about 900 ⁰ C at a measurable rate, one would have to achieve a suitable rate of reaction, the gas mixture to temperatures iooo heat above ⁰ C.

It has now been found that the above-mentioned reaction is rapid even at lower temperatures runs if you use an oxidation catalyst. With a sufficient duration of contact Temperatures of 350 to 8oo ° C are then sufficient between the gas mixture and the catalyst mass, to remove almost all of the carbon mono-

'15 to convert oxide into carbon dioxide.

According to the invention, a gas mixture which, in addition to carbon monoxide, also becomes nitrogen contains monoxide, carbon monoxide is separated in such a way that the mixture is

ao temperature of at least 350 ⁰ C leads over an oxidation catalyst.

example 1

A gas mixture containing in addition to nitrogen monoxide, carbon dioxide and nitrogen as 7.0% carbon monoxide was passed through a reaction tube in which a platinum catalyst composition was located, which was maintained at a temperature of 550 ⁰ C.

The escaping gas mixture contained only 0.4% carbon monoxide.

By increasing the temperature of the contact mass, the final carbon monoxide content can be suppressed as much as 0.1-0.2%.
Conversely, this content increases when you work at lower temperatures. Starting from a carbon monoxide content of 7.0% showed the tail gas at a reaction temperature of 450 ⁰ C a carbon monoxide content of 1.4%, while at 350 ⁰ C, the carbon monoxide content in the tail gas was already 6.5%.

Example 2

A mixture of nitrogen monoxide, carbon monoxide and carbon dioxide with a carbon monoxide content of 8.9% was passed through a _{tube containing vanadium catalyst (11.3% V 2} O ₅ , 2.3% Sn O ₂ ).

At a reaction temperature of 650 ⁰ C, the carbon monoxide content was 5.2% in the tail gas, while at a temperature of 780 ⁰ C the exit gas was almost kohlenmonoxydfrei.

Example 3

The same gas mixture as in Example 2 (8.9% CO) was passed through a _{tube containing a catalyst (mixture of Fe 3} O ₄ , Al ₂ O ₃ and K ₂ O).

At a reaction ^{temperature of 750 °} C., almost all of the carbon monoxide was converted into carbon dioxide.

While every oxidation catalyst is used in the present transformation can (metals, metal oxides, mixtures of metals and / or metal oxides, vanadates, chromites, Molybdates, if appropriate drawn onto a carrier and mixed with promoters), have the catalysts The platinum group is most effective at the lower temperatures.

Claims (1)

PATENT CLAIM: A process for separating carbon monoxide from a kohlenmonoxyd- and stickstoffmonoxydenthaltenden gas mixture, characterized in that the gas mixture is conducted at a temperature of at least 350 ⁰ C on an oxidation catalyst. © 1175 8.51