DE600040C - Process for the production of acetaldehyde from methane and carbonic acid - Google Patents

Description

Process for the production of acetaldehyde from methane and carbonic acid So far found as starting materials for the synthetic production of acetaldehyde mostly acetylene use.

It is true that experiments on carbonic acid assimilation in the Nature, being essentially moist carbonic acid from an electric glow discharge was found to be exposed to these discharges a mixture of methane and water vapor, mainly hydrogen, carbon oxide and formaldehyde and the carbon oxide formed with the methane to acetaldehyde responded. However, it has not been known that acetaldehyde has been successfully converted into commercial products Generate quantities from methane.

The invention now shows a way for the economical preparation of acetaldehyde by a: Mixture of methane and carbonic acid at a higher methane concentration compared to the carbonic acid concentration alone or together with other inert gases, e.g. B. in coke gas, carbonization gas, blast furnace gas and the like., Is passed through an electric field which is generated by high-frequency, high-voltage electrical currents. The reaction seems to proceed essentially according to the following equation: 3 CH4 + 2C0 @ = 2C, H40 + CH20 + H20. The degree of conversion depends on the frequency and voltage of the current and on the rate of passage of the gas mixture. The yield can be positively influenced by introducing contact bodies, such as all metal oxides that are difficult to reducible, in particular also the earths, their carbonates and mixtures thereof, into the field. You can work at atmospheric pressure, at overpressure or underpressure, with an almost theoretical yield being achieved by appropriate setting of the working conditions and, if necessary, repeated passage of the gas mixture through the field. Example i A mixture of 5o 1 methane and 301 carbonic acid was through one in one. High frequency circuit lying capacitor at a speed of i cm / sec. conducted, the voltage in the high-frequency circuit being 75,000 V and the frequency being 1,000,000 Hertz. About ¢ o% of the methane used could be converted into acetaldehyde. EXAMPLE 2 A mixture of -60 l methane and qo l carbonic acid was sent through the same electric field at a vacuum of 500 mm water column. About 35% methane was converted.

By filling the electric field with quartz glass fragments the implementation driven to about 42%. Example 3 Through a field of 80,000 V and 500,000 Hertz was a mixture of 801 mathane and 40 liters of carbonic acid at one pressure directed by i / 2atü. About 35% was implemented.

The drawing shows an example of an installation to carry out the procedure.

The gas containers are labeled g. You are using a uniform Line connected to a, capacitor a, in which the high frequency generator b generated electric field with the appropriate presence of contact bodies will. c is a washing tower connected to the condenser a by a pipeline, from which the washing solution enters a container d.

Claims (1)

PATENT CLAIM: Process for the production of acetaldehyde from methane and carbonic acid, characterized in that the starting materials with a higher methane concentration: compared to the carbonic acid concentration alone or in a mixture with other inert gases at reduced, increased or atmospheric pressure, optionally in the presence of contact substances, by a High-frequency, high-voltage currents generated field are conducted.