What does CH2CL2 become after photocatalytic decomposition? !

Phosgene shouldn’t exist; there’s no such terrifying gas! ! ?

After pyrolysis, HCl and trace phosgene are produced; upon prolonged heating with water, formaldehyde and HCl are formed. Further chlorination yields CHCl3 and CCl4. Colorless and volatile liquid, difficult to burn. Dichloromethane reacts with sodium hydroxide at high temperatures to undergo partial hydrolysis, producing formaldehyde. In the industrial sector, dichloromethane is produced by reacting natural gas with chlorine gas; it is purified through distillation to obtain a pure form. It is an excellent organic solvent that is often used as a substitute for flammable substances such as petroleum ether and diethyl ether. It can also be used as a local anesthetic in dentistry, as a refrigerant, and as a fire extinguishing agent. Its irritancy to the skin and mucous membranes is slightly greater than that of chloroform, so caution should be exercised when using high concentrations of dichloromethane.

By your words, this is still a long-standing problem! ～

Was I not clear enough? That produces phosgene.

So, according to you, photocatalysis can’t be used to deal with CH2CL2? !