PRODUCTION OF HYDROCHLORIC ACID

摘要

PURPOSE:To produce synthesized hydrochloric acid of high purity while recovering the heat of reaction as electric energy by causing chlorine and hydrogen to react electrochemically by making use of a fuel battery wherein a solid membrane having anion selective permeability is used as an electrolyte. CONSTITUTION:A gas diffusing positive electrode 4 is held in tight contact with one surface of an anion exchange membrane 2 in a fuel battery 1. The side of a negative electrode 3 is used as a fuel chamber 5 and the side of the positive electrode 4 as an oxidizer chamber 6. Gaseous H2 is supplied into the chamber 5 and gaseous Cl 8 into the chamber 6. The gaseous Cl is reduced by the electrode 4 and passes as Cl ions through the hydrated membrane 2 and enters the chamber 5, where the Cl ions combine with the H2 ions formed by the oxidation of the gaseous H2 by the electrode 3, thereby producing gaseous HCl. The DC electricity generated between the positive and negative electrodes is drawn out from terminals 21, 21' as electric energy. The gaseous HCl formed by the combination enters an absorption column 15 for gaseous HCl, where said gas is absorbed by dilute hydrochloric acid and is recovered as concd. hydrochloric acid of high purity through a pipe 16.