Abstract: The invention is directed to a process and to an apparatus for saving fuel in furnaces for thermal dissociation of halogenated aliphatic hydrocarbons, especially of 1,2-dichloroethane, using chemical dissociation promoters or physical measures which initiate the dissociation reaction. The initiation of the dissociation reaction lowers the temperature level in the reaction mixture with the same conversion. This can also lower the mean firing chamber temperature and save fuel. In a preferred process variant, flue gas leaving the convection zone of the dissociation oven is analyzed and its dew point is calculated. The dew point of the flue gas or the conversion of the dissociation reaction serves as command parameter for the intensity of the physical measure for initiation and/or for the amount of the chemical dissociation promoter added and/or for the amount of fuel. In a further preferred process variant, the latent heat content of the flue gas is used to preheat the burner air or other media.

Abstract: Process and apparatus for producing ethylenically unsaturated halogenated hydrocarbons The invention relates to a process and an apparatus for preparing ethylenically unsaturated halogenated hydrocarbons, preferably vinyl chloride by thermal dissociation of 1,2-dichloroethane, using physical or chemical measures which initiate the dissociation reaction. The process/apparatus described makes it possible to increase the amount produced using dissociation reactors of a given size considerably. Use is made here of initiating measures to increase the heat flux through the wall of the reaction tube and at the same time the feed stream and the heating power of the reaction furnace are increased so that the conversion of the reaction is not significantly increased compared to processes without use of initiating measures.

Abstract: The invention relates to a process and an apparatus for product-conserving thermal dissociation of halogenated aliphatic hydrocarbons, preferably for thermal dissociation of 1,2-dichloroethane to vinyl chloride. This uses chemical dissociation promoters and/or physical measures which initiate the dissociation reaction. The initiation of the dissociation reaction, with the same conversion, lowers the temperature level in the reaction mixture and the temperature of the dissociation gas on exit from the dissociation furnace. The amount and the exit temperature of the flue gas from the radiation zone of the dissociation furnace likewise decrease at the same time.