Abstract: Disclosed is a method for preparing vinyl chloride by catalytic thermal cracking of 1,2-dichloroethane, in which method the heat required for the thermal cracking is supplied via a liquid or condensing heat transfer medium, wherein, the heat transfer medium is heated at least in part by means of waste heat from a plant for combusting liquid and/or gaseous residues of a chemical plant. The invention also relates to a plant for preparing vinyl chloride by catalytic thermal cracking of 1,2-dichloroethane. The heat required for thermal cracking can be obtained from cheaply available waste heat. For example, it is possible to temporarily heat the heat transfer medium exclusively by means of the second heating device operated by waste heat, wherein said waste heat can, for example, be waste heat from a plant for preparing vinyl chloride.

Abstract: The present invention relates to a method for preparing vinyl chloride by catalytic thermal cracking of 1,2-dichloroethane, in which method the heat required for the thermal cracking is supplied via a liquid or condensing heat transfer medium. The present invention also relates to a plant for preparing vinyl chloride by catalytic thermal cracking of 1,2-dichloroethane, in which the heat required for the thermal cracking, as well as for the preceding preheating, evaporation and optionally overheating of the 1,2-dichloroethane, is supplied via a liquid or condensing heat transfer medium, said plant comprising at least one reactor in which the thermal cracking takes place and at least one first heating device by means of which heat is transported to the reaction medium in the reactor by means of the liquid or condensing heat transfer medium.

Abstract: Copolymers of vinyl acetate, vinyl chloride, and vinyl esters of long chain carboxylic acids are soluble in low polarity organic solvents, and produce superior binder and seam-sealing compositions. The copolymers contain 50-75 wt. % vinyl chloride, 5-25 wt. % vinyl acetate, and 10-55 wt. % vinyl ester of long-chain carboxylic acid.

Abstract: The invention relates to a method for synthesizing 1.2-dichloroethane from ethylene and chlorine via low temperature direct chlorination of ethylene in the presence of a catalyst under conditions in which the synthesized 1.2-dichloroethane is condensed out, however, the ethylene and the chlorine are gaseous, in a reactor (3), wherein the stoichiometric ratio of ethylene to chlorine is adjusted in the reactor (3) such that there is an excess of ethylene. The invention further relates to a device for synthesizing 1.2-dichloroethane from ethylene and chlorine via low temperature direct chlorination of ethylene in the presence of a catalyst under conditions in which the synthesized 1.2-dichloroethane is condensed out, however, the ethylene and the chlorine are gaseous, in a reactor (3), wherein the stoichiometric ratio of ethylene to chlorine is adjustable in the reactor (3) such that there is an excess of ethylene.

Abstract: Method of concentrating aqueous alkali and apparatus suitable for this purpose. A very energy-saving method of concentrating aqueous alkali originating, for example, from a chloralkali electrolysis plant and an apparatus suitable for this purpose are described. The method/the apparatus utilizes heat of reaction from the formation of 1,2-dichloroethane and includes multistage concentration of the aqueous alkali, where at least part of the heat required for concentrating the aqueous alkali originates from the plant for preparing 1,2-dichloroethane and at least a further part of the heat required for concentrating the aqueous alkali originates from at least one of the higher stages of the plant for concentrating the aqueous alkali and is used for partial heating of the first stage. The apparatus can be used for retrofitting existing integrated plants made up of a DCE plant and chloralkali electrolysis or in the erection of new plants.

Abstract: An apparatus (1) and method for drying polymer powders is described. The apparatus has an inlet (2) and an outlet (3) for the polymer powder, heat registers (5) installed in the interior space (4) and lines (7) for a heated gas (6a) for drying the polymer powder. The lines open into the interior space (4) and are connected to heat exchangers (9) for heating gas (6). The heat exchangers (9) are connected to a plant for the preparation of 1,2-dichloroethane (15) and/or for the preparation of vinyl chloride from 1,2-dichloroethane so that thermal energy from the plant can be utilized for heating the gas (6). The method comprises treatment of a polymer powder with a heated gas (6a) in the drying apparatus (1).

Abstract: The present invention relates to a process for the production of polyvinyl chloride (PVC) having a median grain size of from 10 to 80 ?m by suspension polymerization of vinyl chloride, the process comprising the following process steps: (a) introduction of water, initiator(s), optionally one or more further adjuvants, and some of the vinyl chloride into a container as initial charge and mixing of the constituents; (b) dispersion, and addition of one or more suspension auxiliaries with continued dispersion; (c) heating of the mixture; (d) addition of the remaining vinyl chloride; and (e) working-up of the product.

Abstract: Energy savings in an integrated DCE/VCM plant, optionally also containing a PVC plant, is accomplished by using at least part of the vapor from a DEC quenching column to supply heat to an HCl column. The DCE plant has a high boiler column operating at superatmospheric pressure, and heat is removed from an overhead stream and used to supply heat to other portions of the process.

Abstract: Energy savings in an integrated DCE/VCM plant, optionally also containing a PVC plant, is accomplished by using at least part of the vapor from a DEC quenching column to supply heat to an HCl column. The DCE plant has a high boiler column operating at superatmospheric pressure, and heat is removed from an overhead stream and used to supply heat to other portions of the process.

Abstract: Disclosed is a process and apparatus for heat recovery in vinyl chloride monomer manufacturing plants or in integrated vinyl chloride monomer/polyvinyl chloride manufacturing plants. A process for capture and use of excess heat recovered in the production of vinyl chloride includes distillatively purifying DCE in a high-boilers column, using a heat exchanger to capture thermal energy from a purified DCE vapor stream from the high-boilers column, generating low pressure steam from the captured thermal energy, returning condensed DCE vapors to the high-boilers column, and heating parts of the plant with the generated low pressure steam.

Abstract: Method of concentrating aqueous alkali and apparatus suitable for this purpose. A very energy-saving method of concentrating aqueous alkali originating, for example, from a chloralkali electrolysis plant and an apparatus suitable for this purpose are described. The method/the apparatus utilizes heat of reaction from the formation of 1,2-dichloroethane and includes multistage concentration of the aqueous alkali, where at least part of the heat required for concentrating the aqueous alkali originates from the plant for preparing 1,2-dichloroethane and at least a further part of the heat required for concentrating the aqueous alkali originates from at least one of the higher stages of the plant for concentrating the aqueous alkali and is used for partial heating of the first stage. The apparatus can be used for retrofitting existing integrated plants made up of a DCE plant and chloralkali electrolysis or in the erection of new plants.

Abstract: Process for operating a distillation column for the removal of water and lower-boiling components than 1,2-dichloroethane from 1,2-dichloroethane in which at least part of the heat from condensation of the aqueous vapors from the distillation column is used to concentrate caustic soda solution by evaporation; furthermore, at least part of the 1,2-dichloroethane formed when chlorine and ethylene react in a direct chlorination unit is used to heat said distillation column and can subsequently also be used as a heat transfer fluid to concentrate caustic soda solution by evaporation.

Abstract: An apparatus (1) and method for drying polymer powders is described. The apparatus has an inlet (2) and an outlet (3) for the polymer powder, heat registers (5) installed in the interior space (4) and lines (7) for a heated gas (6a) for drying the polymer powder. The lines open into the interior space (4) and are connected to heat exchangers (9) for heating gas (6). The heat exchangers (9) are connected to a plant for the preparation of 1,2-dichloroethane (15) and/or for the preparation of vinyl chloride from 1,2-dichloroethane so that thermal energy from the plant can be utilized for heating the gas (6). The method comprises treatment of a polymer powder with a heated gas (6a) in the drying apparatus (1).

Abstract: With a method for utilization of the reaction heat that occurs in the production of 1,2-dichloroethane from ethylene, by reaction with oxygen and hydrochloride (oxychlorination), in a fluidized bed reactor, with dissipation of this reaction heat through cooling pipe bundles situated within the reactor, positioned in the fluidized bed, utilization of the heat is supposed to be improved, while simultaneously reducing the size of the corresponding system elements. This is achieved in that part of the reaction heat is dissipated by heating boiler feed water, whereby the heated boiler feed water is used to heat heat sinks in the production process.

Abstract: The present invention relates to a process for the production of polyvinyl chloride (PVC) having a median grain size of from 10 to 80 ?m by suspension polymerization of vinyl chloride, the process comprising the following process steps: (a) introduction of water, initiator(s), optionally one or more further adjuvants, and some of the vinyl chloride into a container as initial charge and mixing of the constituents; (b) dispersion, and addition of one or more suspension auxiliaries with continued dispersion; (c) heating of the mixture; (d) addition of the remaining vinyl chloride; and (e) working-up of the product.

Abstract: With a method for utilization of the reaction heat that occurs in the production of 1,2-dichloroethane from ethylene, by reaction with oxygen and hydrochloride (oxychlorination), in a fluidized bed reactor, with dissipation of this reaction heat through cooling pipe bundles situated within the reactor, positioned in the fluidized bed, utilization of the heat is supposed to be improved, while simultaneously reducing the size of the corresponding system elements. This is achieved in that part of the reaction heat is dissipated by heating boiler feed water, whereby the heated boiler feed water is used to heat heat sinks in the production process.

Abstract: The invention relates to a method for using reaction heat produced by reaction during the production of 1,2-dichloroethane from ethylene and chlorine in a direct chlorination reactor. The chlorine is produced in a sodium chloride electrolysis and the reaction heat, during the formation of 1,2-dichloroethane is used at least partially for the evaporation of NaOH, which is produced during NaCl-electrolysis for producing the required chlorine for direct chlorination, as a coupling product. The invention also relates to a device for carrying out said method, comprising a multi-tube heat exchanger comprising two fixed tubular plates and a NaOH-liquid phase part, and the caustic soda passes through the inside of the tube and 1,2-dichloroethane passes the outside of the tube. The heat exchanger also comprises devices for feeding and distributing the caustic soda in the inside of the tube.

Abstract: The invention refers to a process for the production of high-purity 1,2-dichloroethane from dissolved chlorine and dissolved ethylene, which are brought into contact with each other in a circulating liquid reaction fluid, which mainly consists of 1,2-dichlorethane and a catalyst and flows through at least one vertically arranged loop-type reaction section, both legs of the loop being connected to an overhead degassing vessel from where the reaction product is withdrawn either in gaseous or in liquid state or in both gaseous and liquid state, and numerous admixing sections being arranged in the leg of the loop in which the liquid rises, and each of these admixing sections having one upstream feed point for dissolved or gaseous ethylene and one downstream feed point for dissolved chlorine and, if required, the admixing sections featuring static mixers.

Abstract: The invention relates to a process for the production of vinyl chloride by thermal cracking, in which the energy balance, the operating time of the cracking furnace and/or the yield of the reaction are distinctly enhanced in comparison with the prior art. A pressure of from 1.4 to 2.5 MPa is established in the cracking coil at a temperature of from 450 to 550° C. and, for pre-heating the EDC (=1,2-dichloroethane) introduced, inter alia the waste heat of the gas stream leaving the top of the quench column is utilized.

Abstract: A process for the preparation of vinyl chloride copolymers involves free radical suspension polymerization or emulsion polymerization of a mixture of vinyl chloride, epoxide-containing vinyl monomers and further comonomers copolymerizable therewith, wherein a) from 49.5 to 90% by weight of vinyl chloride, b) from 0.01 to 0.7% by weight of epoxide-containing vinyl monomers and c) from 9.5 to 50% by weight of further comonomers copolymerizable with a) and b) are polymerized, the data in % by weight totaling 100% by weight, and from 0.001 to 0.1% by weight of one or more aliphatic or alicyclic, saturated or unsaturated dicarboxylic acids having 1 to 10 carbon atoms, or aliphatic and alicyclic, saturated and unsaturated hydroxymono-, hydroxydi- and hydroxytricarboxylic acids having 3 to 10 carbon atoms and 1 to 4 hydroxyl groups are added during or after the polymerization, and the vinyl chloride copolymer is isolated as a solid resin.