The objective of the present invention is to provide a method for producing a halogenated carbonyl safely and efficiently. The method for producing a halogenated carbonyl according to the present invention is characterized in comprising the step of applying ultrasound to a composition containing a C.sub.1-4 halogenated hydrocarbon having one or more halogeno groups selected from the group consisting of chloro, bromo and iodo in the presence of oxygen to decompose the C.sub.1-4 halogenated hydrocarbon.

The objective of the present invention is to provide a method for producing a halogenated carbonyl safely and efficiently. The method for producing a halogenated carbonyl according to the present invention is characterized in comprising the step of applying ultrasound to a composition containing a C.sub.1-4 halogenated hydrocarbon having one or more halogeno groups selected from the group consisting of chloro, bromo and iodo in the presence of oxygen to decompose the C.sub.1-4 halogenated hydrocarbon.

The present invention relates to a process for preparing phosgene by reacting chlorine with carbon monoxide over an activated carbon catalyst, wherein the content of chlorine oxides in the chlorine feed stream is low, to an apparatus for preparation of phosgene and to the use of the phosgene prepared by the process of the invention.

The present invention relates to a process for preparing phosgene by reacting chlorine with carbon monoxide over an activated carbon catalyst, wherein the content of chlorine oxides in the chlorine feed stream is low, to an apparatus for preparation of phosgene and to the use of the phosgene prepared by the process of the invention.

Disclosed are methods and systems for desulfurization of CO-rich streams. A method can include contacting a CO-rich gas stream with activated carbon and/or contacting the CO-rich gas stream with a zinc-oxide sorbent material at a temperature of 0 to 50° C. to remove at least a portion of the sulfur-containing compounds present in the stream.

Disclosed are methods and systems for desulfurization of CO-rich streams. A method can include contacting a CO-rich gas stream with activated carbon and/or contacting the CO-rich gas stream with a zinc-oxide sorbent material at a temperature of 0 to 50° C. to remove at least a portion of the sulfur-containing compounds present in the stream.

A method for producing phosgene directly from the directly combined raw products, preferably only dried raw products, of a combined CO.sub.2 chloride electrolysis. A first gaseous product of CO is produced from CO.sub.2 on the cathode side in at least one electrolysis cell for a CO.sub.2 conversion into CO, and a second gaseous product of at least Cl.sub.2 is produced from HCl and/or a metal chloride on the anode side, wherein phosgene is produced from the gaseous products.

A method for producing phosgene directly from the directly combined raw products, preferably only dried raw products, of a combined CO.sub.2 chloride electrolysis. A first gaseous product of CO is produced from CO.sub.2 on the cathode side in at least one electrolysis cell for a CO.sub.2 conversion into CO, and a second gaseous product of at least Cl.sub.2 is produced from HCl and/or a metal chloride on the anode side, wherein phosgene is produced from the gaseous products.

The invention relates to a method for cleaning a phosgene-conducting apparatus by pressurization with ammonia gas to constant pressure. In this way, phosgene residues in the apparatus to be cleaned are decomposed effectively.

The invention relates to a method for cleaning a phosgene-conducting apparatus by pressurization with ammonia gas to constant pressure. In this way, phosgene residues in the apparatus to be cleaned are decomposed effectively.