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AssigneeMitsui Toatsu Chemicals, Inc.
InventorsHiroyuki Itoh, Yoshitsugu Kono, Masanobu Ajioka, Shinji Takenaka, Masafumi Kataita
Estimating the term…
Chlorine is produced by oxidizing byproduced hydrogen chloride. An offgas containing hydrogen chloride as a byproduct is reacted with oxygen at 300.degree.-500.degree. C. in the presence of a catalyst which contains chromic oxide (Cr.sub.2 O.sub.3) as a principal component. The resulting gas is cooled rapidly and then washed with water to recover vaporized chromium. The hydrogen chloride is then absorbed in water to recover it as an aqueous hydrochloric acid solution. The still remaining portion of the resultant gas is washed with sulfuric acid to remove water from the same, followed by compression and cooling. The resulting liquefied chlorine is separated. The still remaining gas composed principally of oxygen is thereafter returned to the oxidation step.
A process for producing chlorine by oxidizing an offgas by-product of a reaction step of an organic compound containing hydrogen chloride therein, which comprises the following steps:
In a procoess for producing chlorine by oxidizing an offgas by-product of a reaction step of an organic compound and containing hydrogen chloride therein, the improvement wherein the oxidation of the offgas is conducted in the presence of a chromic oxide catalyst after lowering the content of the organic compound in the offgas to a level lower than 1 wt. % based on the weight of offgas.
In a process for producing chlorine by oxidizing an offgas by product of in a reaction step of an organic compound and containing hydrogen chloride therein, the improvement wherein the oxidation of the offgas is conducted in the presence of a chormic oxide catalyst after lowering the content of carbon monoxide in the offgas to a level lower than 10 vol. %.
Dependencies are inferred from the claim text.