Journal . tee foundthat carbonic acid has the power of returning polybasicsolutions of lead nitrite to a neutral condition by preci- April ?::>, THE OF THE SOCIETY OF CHEMICAL INDUSTRY. LMI pitating the excess of base in the form of lead carbonatemixed with lead hydrate, thus :—1(\< I ) ,; »| r2HS0 I 2CO»= IM No,.)., i i 2PbCOa i Pb(OH).. Itwill, therefore, he seen that a relatively small quantityof lead nitrite, which is constantly regenerated, convertsan indefinite quantity of lead into white lead. Theaccompanying drawing represents an arrangement forcarry
Journal . tee foundthat carbonic acid has the power of returning polybasicsolutions of lead nitrite to a neutral condition by preci- April ?::>, THE OF THE SOCIETY OF CHEMICAL INDUSTRY. LMI pitating the excess of base in the form of lead carbonatemixed with lead hydrate, thus :—1(\< I ) ,; »| r2HS0 I 2CO»= IM No,.)., i i 2PbCOa i Pb(OH).. Itwill, therefore, he seen that a relatively small quantityof lead nitrite, which is constantly regenerated, convertsan indefinite quantity of lead into white lead. Theaccompanying drawing represents an arrangement forcarrying out the process in practice. The lead, afterbeing reduced to shavings, is placed in a chamber, A, at(he bottom of which is a j -i | e a fur the BUpply of the^?asi s required; 6 is a gas-distributor, <? a grating forthe support oE the lead, <• the inlet pipe for the liquids, and /an nutlet pipe for the gases. As soon as A is two-thirds filled with lead and a solution of lead nitrite, a. mixture of air and carbonic acid, heated to a suitabletemperature is injected into the converter A, whence thegases are conducted to a series of towers, I!, filled withsolutions of poly basic lead nitrite, which retains all thenitrous acid which they may carry with them. Thenolybasic nitrite has a great affinity for nitrous acid,being thereby converted into lead nitrite. By means ofa pump the liquids are frequently transferred between1 lie converter and the towers. The white lead collects atthe bottom of the converter A, where it is drawn oilthrough g as last as it is produced, in order to he filter-pressed and washed.—S. H. Improvement in Obtaining Ammonia, Chlorine midHydrochloric Acid from Ammonium Chloride. , Northwich. Kng. Pat. 323S, March 8, 1886. 6d. In previous specifications (Eng. Pat. 1886, Nos. 65, 66, and 1040 ; this Journal, 1887, HO. 216 and 217), thepatentee described a process for obtaining ammonia,chlorine and hydrochloric acid by passing over certa
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
