A college text-book of chemistry . uantity of the gasshould be capable of transforming an infinite quantity ofsulphur dioxide into sulphuric acid. Other reactions besides those mentioned above areundoubtedly involved in the manufacture of sulphuricacid, but, according to the most elaborate researches madeon the subject in a factory in operation, those mentionedare the principal ones. Whatever the details may be, theoxidation is effected without difficulty, and the waste innitrogen compounds is now but slight. The reactions, as has been said, are carried on in largechambers lined with lead, and
A college text-book of chemistry . uantity of the gasshould be capable of transforming an infinite quantity ofsulphur dioxide into sulphuric acid. Other reactions besides those mentioned above areundoubtedly involved in the manufacture of sulphuricacid, but, according to the most elaborate researches madeon the subject in a factory in operation, those mentionedare the principal ones. Whatever the details may be, theoxidation is effected without difficulty, and the waste innitrogen compounds is now but slight. The reactions, as has been said, are carried on in largechambers lined with lead, and known as the leaden cham-bers. The sulphur is burned in a special furnace soarranged that air has free access to it. The dioxide thusformed is then conducted through a tower so constructedthat it presents a large surface to the action of the gas. 226 COLLEGE CHEMISTRY. Through this tower dilute sulphuric acid, taken fromanother tower at the end of the system, flows from aboveand the hot gases coming in contact with this serve the. purpose of concentrating it, while the gas itself is cooledbefore entering the leaden chamber. The general arrange-ment of the essential parts of a sulphuric-acid factory areshown in Fig. i2. SULPHURIC ACID. 227 The sulphur dioxide passes through the large tube xinto the tower G, called the Glover tower. This is filledfrom d to e with pieces of fire-brick over which from thecistern b a continual stream of dilute sulphuric acid gases are thus cooled down and the acid a second cistern there flows at the same time con-centrated sulphuric acid from the tower 0, or the Gay-Lussac tower. This stronger acid contains oxides ofnitrogen in combination, and by contact with the diluteacid the oxides are set free and are thus mixed with thesulphur dioxide. The nitric acid is introduced into thefirst chamber, No. 1, in the form of vapor, together withthe oxides of nitrogen and sulphur dioxide, and here alsothe gases meet with water-vapo
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