US PATENT SUBCLASS 423 / 524-- .~.~.~.~.~ Lead chamber process

US PATENT SUBCLASS 423 / 524
.~.~.~.~.~ Lead chamber process

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999 Terms of Use

423 /	HD	CHEMISTRY OF INORGANIC COMPOUNDS

511	DF	SULFUR OR COMPOUND THEREOF {4}
512.1	DF	.~ Oxygen containing {11}
521	DF	.~.~ Ternary compound containing hydrogen {1}
522	DF	.~.~.~ Sulfuric acid {5}
523	DF	.~.~.~.~ Nitrogenous impurity or utilizing nitrogenous catalyst or reactant {1}
524		.~.~.~.~.~ Lead chamber process

DEFINITION

Classification: 423/524

(under subclass 523) Processes wherein sulfuric acid is produced from sulfur dioxide oxygen (air) and water or steam by means of nitrogen oxides (catalysts or reactants) in leaden chambers.

(1) Note. The complete lead chamber process involves production of sulfur dioxide by burning sulfur or sulfur compounds. Sulfuric acid is produced in the lead chamber from the sulfur dioxide, oxygen (air), and water or steam by

means of nitrogen oxides (catalysts or reactants). The gases leaving the reaction chamber contain practically the entire quantity of nitrogen oxides which have brought about the oxidation of SC₂ to SO_{3[end subscrpt]. These nitrogen oxides are recovered by absorption in H₂SO₄ in so called Gay-Lussac towers. The nitrous sulfuric acid produced in these towers is conveyed to the beginning of the system where it is denitrated in so called Glover towers by means of the entering hot gases containing sulfur dioxide.}