. Journal. suction of the injector lor the regeneration, to a certainextent, of the nitric acid.—H. A. Improvements in and Apparatus for the Concentrationof Sulphuric Acid. J. L. Kessler, Clermont-Ferrand,France. Eng. Pat. 19,215, November G, apparatus consists of a series of shallow evaporatingpans made of siliceous materials covered with lead, ami thefigure represents a vertical section of one form of it. Theheat is derived from a large open fire of slow draught, andafter putting on fresh fuel the draught must be cut offfrom the apparatus in order to prevent the acid frombecoming co
. Journal. suction of the injector lor the regeneration, to a certainextent, of the nitric acid.—H. A. Improvements in and Apparatus for the Concentrationof Sulphuric Acid. J. L. Kessler, Clermont-Ferrand,France. Eng. Pat. 19,215, November G, apparatus consists of a series of shallow evaporatingpans made of siliceous materials covered with lead, ami thefigure represents a vertical section of one form of it. Theheat is derived from a large open fire of slow draught, andafter putting on fresh fuel the draught must be cut offfrom the apparatus in order to prevent the acid frombecoming contaminated with dust. The hot air is prefer-ably drawn through the apparatus by means of an exhaustat the outlet. The temperature of the acid need not riseabove 200 . The apparatus consists of the trough S into which thehot gases pass from the furnace. They circulate first throughthe passages q q (q- q- are partitions) from which it passesto the passages iy , and the acid is readily concentrated. ! 1 I i APPARATUS FOR CONCENTRATING SULPHURIC 66° B. in this trough. The gases passes upwards overeach succeeding trough of acid, whilst from the uppertroughs the acid flows downwards, finally reaching thebottom trough S. The weak acid to be concentrated isrun into the upmost trough and becomes gradually con-centrated as it passes to the lower ones.—.1. \V. I,. Improvements in the Manufacture of Sodium Bigot and J. Schreiter, Hamburg, Germany. 19,382, November 9, 1891. Calcium borates may be converted into calcium tetra-borate by treatiug them with sulphuric acid or sodiumhydrogen sulphate, and the calcium tetraborate may bereadily converted into sodium tetraborate by heating withsodium sulphate. The quantities recommended are: 100parts of calcium borate, 200 parts of water boiled with37 parts of sulphuric acid and 140 parts of sodiumsulphate, or with 91 parts of sodium bisulphate and85 parts of sodium sulphate. The mixture may be boiledunder a pressure
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
