Distillation process for separating chlorine from gas streams comprising oxygen and chlorine
AssigneeBase SE
InventorsHans-Jürgen Pallasch, Heiner Schelling, Peter Van den Abeel, Till Einig
Life of this patent
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Abstract
The invention relates to a process for separating chlorine from a gas stream I comprising oxygen and chlorine, in which the gas stream I is fed into a lower part of a column K1 and a separately provided liquid, hydrogen chloride stream II is fed into an upper part of the same column and the ascending gaseous stream I is brought into contact with the descending liquid stream II, with chlorine condensing out from the stream I and hydrogen chloride vaporizing from the stream II to give an essentially chlorine-free gas stream III comprising hydrogen chloride and oxygen and a liquid stream IV comprising chlorine.
Claims15
A process for separating chlorine from a gas stream I comprising oxygen and chlorine, wherein the gas stream I is fed into a lower part of a column K1 and a separately provided liquid, hydrogen chloride stream II is fed into an upper part of the same column and the ascending gaseous stream I is brought into contact with the descending liquid stream II, with chlorine condensing out from the stream I and hydrogen chloride vaporizing from the stream II to give an essentially chlorine-free gas stream III comprising hydrogen chloride and oxygen and a liquid stream IV comprising chlorine.
A process for preparing chlorine from hydrogen chloride, which comprises the steps:
- a) introduction of a stream a1 comprising hydrogen chloride and a stream a2 comprising oxygen into an oxidation zone and catalytic oxidation of hydrogen chloride to chlorine, giving a product gas stream a3 comprising chlorine, water, oxygen, carbon dioxide and inert gases;
- b) contacting of the product gas stream a3 with aqueous hydrochloric acid in a phase contact apparatus and at least partial separation of water and of hydrogen chloride from the stream a3, leaving a gas stream b comprising hydrogen chloride, chlorine, water, oxygen, carbon dioxide and possibly inert gases;
- c) drying of the gas stream b to leave an essentially water-free gas stream c comprising hydrogen chloride, chlorine, oxygen, carbon dioxide and possibly inert gases;
- d) optionally compression and cooling of the gas stream c, to give a compressed or cooled or compressed and cooled gaseous stream c;
- e) introduction of the optionally compressed and cooled gaseous stream c into a lower part of a column K1 and introduction of a separately provided liquid hydrogen chloride stream e into an upper part of the same column K1 and contacting of the ascending gaseous stream c with the descending liquid stream e, with gaseous chlorine condensing out from stream c and liquid hydrogen chloride vaporizing from the stream e to give an essentially chlorine-free gas stream e1 comprising hydrogen chloride, oxygen, carbon dioxide and possibly inert gases and a liquid stream e2 comprising chlorine;
- f) recirculation of at least part of the gas stream e1 comprising hydrogen chloride, oxygen, carbon dioxide and possibly inert gases to the oxidation step a).
Dependencies are inferred from the claim text.