System for the chemical decontamination of corrosive gases

A method for decontaminating an atmosphere contaminated by a corrosive gas comprising the following steps:

• 1) spraying, directly into the contaminated atmosphere, a composition comprising at least one acido-basic neutralising agent for decontaminating an atmosphere contaminated by a corrosive gas, said at least one acido-basic neutralising agent being a mixture of at least one conjugate base of an acid and of at least one conjugate acid of a base and having at least 2 pKa's and wherein:
• pKa 1≤pKa 2,
• pKa 1>2,
• pKa 2<12−4<½, and
• (pKa 1+pKa 2)<10,
• pKa 1 representing the smallest of the basic pKa's and pKa 2 represents the largest of the acidic pKa's;
• then
• 2) checking the decontamination;
• 3) optionally repeating steps 1 and 2 until there is total decontamination;
• 4) recovering the solid or liquid residues;
• and
• 5) optionally rinsing the decontaminated zone to eliminate the residues of the composition.

A device for decontaminating an atmosphere contaminated by a corrosive gas, comprising:

• at least one means able to spray a composition comprising at least one acido-basic neutralising agent for decontaminating an atmosphere contaminated by a corrosive gas, said at least one acido-basic neutralising agent being a mixture of at least one conjugate base of an acid and of at least one conjugate acid of a base and having at least 2 pKa's and wherein:
• pKa 1≤pKa 2,
• pKa 1>2,
• pKa 2<12−4<½, and
• (pKa 1+pKa 2)<10,
• pKa 1 representing the smallest of the basic pKa's and pKa 2 represents the largest of the acidic pKa's;
• and
• at least one reservoir intended to receive said composition.