process for preparing chlorine from hydrogen chloride and using liquid hydrogen chloride

摘要

Process for Preparing Chlorine from Hydrogen Chloride and Using Liquid Hydrogen Chloride The invention relates to a method for producing chlorine from hydrogen chloride comprising the following steps: a) preparing a flow of liquid hydrogen chloride at available with a refrigerant flow; b) feeding at least one hydrogen chloride-containing stream b1 and oxygen-containing stream b2 into a zone of hydrogen chloride oxidation and catalytic oxidation of hydrogen chloride to chlorine giving a gas stream of product b3 comprising chlorine , water, oxygen, carbon dioxide and inert gases; c) contacting the gas stream of product b3 with aqueous hydrochloric acid i in a phase contact apparatus and partially separating water and hydrogen chloride from stream b3, leaving a gas stream and comprising hydrogen chloride, chlorine, water, oxygen, carbon dioxide and possibly inert gases; d) drying the gas stream c to leave a gas stream d essentially without water comprising hydrogen chloride, chlorine, oxygen, carbon dioxide and possibly inert gases; e) partial liquefaction of the gas stream from the compression and cooling flow, a flow that is at least partially liquefied and being obtained; f) gas / liquid separation from the flow and into a gas flow f1 comprising chlorine, oxygen, carbon dioxide, hydrogen chloride and possibly inert gases and a liquid flow f2 comprising hydrogen chloride, chlorine, oxygen and carbon dioxide and optionally recirculation of at least part of gas stream f1 in step b); g) separating the liquid stream f2 by distillation on a column to give a chlorine stream g1 and a stream g2 consisting substantially of hydrogen chloride, oxygen and carbon dioxide; cooling and partial liquefaction of the gas stream d in step e) being the result of heat exchange with the liquid hydrogen chloride flow at at least a part of the liquid hydrogen chloride flow being evaporated and this part being obtained as a flow of gaseous hydrogen chloride a '.