The production of sulphuric acid and a proposed new method of manufacture . o whom the author is indebted for muchvaluable assistance. 527°—Bull. 283—15 2 10 BULLETIN 283. U. S. DEPARTMENT OE AGRICULTURE. tivity in the apparatus. Moreover, the constant impinging of thegases on the walls of the spiral flue, which can be cooled either byair or water, makes it practicable to maintain the gases at a temper-ature most favorable for the efficient yield of sulphuric acid. In the following laboratory experiments, however, the sulphurdioxide (802) used was not directly derived from burning pyrites orsu
The production of sulphuric acid and a proposed new method of manufacture . o whom the author is indebted for muchvaluable assistance. 527°—Bull. 283—15 2 10 BULLETIN 283. U. S. DEPARTMENT OE AGRICULTURE. tivity in the apparatus. Moreover, the constant impinging of thegases on the walls of the spiral flue, which can be cooled either byair or water, makes it practicable to maintain the gases at a temper-ature most favorable for the efficient yield of sulphuric acid. In the following laboratory experiments, however, the sulphurdioxide (802) used was not directly derived from burning pyrites orsulphur, so it was necessary to heat the system artificially to at-tain a temperature as high as that obtained under factory conditions. The sulphur dioxide was obtained from a small cylinder of theliquefied gas, which was weighed both before and after each experi-ment, and the S02 used thus determined. The oxides of nitrogen(chiefly N203 and N204) were produced by the action of dilute nitricacid on copper, and the rate at which they were used was roughly d/ranc/Sfeai. Fig. 1.—Apparatus used in proposed new method for manufacture of sulphuric acid. determined by allowing the gases to bubble through dilute sulphuricacid saturated with these gases. A mixture of air and water vaporwas obtained by drawing air through a flask of water heated to theboiling point. The apparatus employed (fig. 1) consisted, first, of a large testtube (A), having a capacity of 200 , and containing a little waterheated to boiling. The oxides of nitrogen, sulphur dioxide, ah, andwater vapor were led to the bottom of this vessel by separate tubesand given a preliminary mixing. From the test tube the gases weredrawn into the lead or glass spiral (B), which was heated to about90° C. in order to facilitate the reactions. In winding downwardthrough this spiral the warm gases were thoroughly mixed, with theresult that most of the sulphuric acid produced in the system wasformed in this coil. The residua
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Keywords: ., bookauthorwaggaman, bookcentury1900, bookdecade1910, bookyear1915
