FIELD: chemistry.
SUBSTANCE: invention relates to the method for producing vinyl chloride by thermal cleavage of 1,2-dichloroethane in the complex to prepair vinyl chloride by distillation purification of 1,2-dichloroethane with, at least, one column of high boiling compounds, in which materials with a higher boiling point than 1,2-dichloroethane are removed, and by optionally associated plant for producing PVC. The said method comprises the steps of: (a) operating the column of the high boiling compounds at the column top temperature of 120-150°C and (b) applying of, at least, a portion of the overhead stream from the column of the high boiling compounds to obtain the heat energy used in the heat sinks of the installation component intended for the preparation of 1,2-dichloroethane and/or in the heat sinks of the installation component intended for the preparation of vinyl chloride and/or heat sink component of the installation downstream, designed to produce PVC with (c) applying a top stream for indirect heating heat sinks by application of, at least, a portion of the overhead stream from the column of the high boiling compounds to produce a low pressure steam and returning of the overhead stream to the column of the high boiling compounds with subsequent condensation with or without supercooling and application of the low pressure steam for heating the selected parts of the installation. Also it relates to the device for preparing vinyl chloride by thermal cracking of 1,2-dichloroethane in the complex for prepairing vinyl chloride by distillation purification of 1,2-dichloroethane and by optionally attached device for prepairing PVC. The said apparatus comprises the following elements: (A) at least, one column of the high-boiling compounds in the installation component for distillation purification of 1,2-dichloroethane, in which substances having a boiling point higher than of 1,2-dichloroethane are removed (B) at least, one heat exchanger, which is connected with the column of the high boiling compounds and which is supplied with, at least, a portion of the overhead stream from the column of the high boiling compounds for condensation and optional subcooling in it to get heat by the formation of low-pressure steam, and then to return to the column of the high boiling compounds and (C) at least, one heat sink in the installation component for the preparation of 1,2-dichloroethane and/or in the connected component of the installation for prepairing vinyl chloride and/or in the connected component of the installation for prepairing PVC, which serves low pressure steam obtained in the heat exchanger (B) for heating.
EFFECT: significant improvement in the energy balance of the installations complex and the improvement of the method and device safety by allowing heat of the physically remote heat sinks.
12 cl
