摘要:

AbstractAn investigation was made of the possibility of separating ferric and aluminium chlorides by heating mixtures of these chlorides with graphite. This scheme of separation was based on reports of other investigators who claimed that graphite formed lamellar complexes with ferric chloride but not with aluminium chloride. It was found, however, that graphite occludes aluminium chloride and also aluminium chloride and ferric chloride together. The stabilities of both these new complexes were examined and the compositions of the mixed ferric chloride–aluminium chloride complexes were also studied. It was concluded, from distribution studies, that a separation of both chlorides by heating mixtures of them with amounts of graphite in suitable proportion to the ferric chloride present is feasible, and of possible value in the industrial chlorination of ferruginous aluminium ore

ISSN:0021-8871    

DOI:10.1002/jctb.5010021001

出版商:John Wiley&Sons, Ltd    

年代:1952

数据来源: WILEY

摘要:

AbstractA reaction between ferric oxide and anhydrous aluminium chloride has been shown to be thermodynamically favourable at temperatures between 25° and 285°. An experimental investigation of this reaction showed that it proceeded slowly at 200°, but rapidly at temperatures in the range 250° to 350°. Experimentally determined equilibrium constants did not agree with calculated constants, which were greater. This discrepancy is attributed to false equilibria being attained at experimental temperatures below the triple point of ferric chloride, 285°. Equilibrium at 300° and 350° corresponded with complete conversion of the ferric oxide to ferric c

ISSN:0021-8871    

DOI:10.1002/jctb.5010021002

出版商:John Wiley&Sons, Ltd    

年代:1952

数据来源: WILEY

摘要:

AbstractThe preparation and properties of hexamethonium ‘embonate’, a sparingly soluble salt of hexamethonium (hexane‐1:6‐bistrimethylammonium) with ‘embonic acid’ (2:2′‐dihydroxy‐1:1′‐dinaphthylmethane‐3:3′‐dicarboxylic acid), are described, as well as its use as an intermediate in the preparation of soluble hexamethonium salts.A number of new bisquaternary ammonium salts have been prepared.The formation of sparingly soluble salts by hexamethonium and other bases

ISSN:0021-8871    

DOI:10.1002/jctb.5010021003

出版商:John Wiley&Sons, Ltd    

年代:1952

数据来源: WILEY

摘要:

Abstract(1) The corrosion of stainless steel by dilute sulphuric acid is accelerated by anodic treatment (when the chromium enters the solution in the sexivalent state) or by cathodic treatment (when it enters as tervalent ions). (2) In acid containing oxygen, the corrosion is negligible and the potential positive; in acid freed from oxygen with hydrogen, nitrogen or argon, corrosion is relatively rapid and the potential negative. (3) After short exposure to oxygen‐containing acid, the replacement of oxygen by another gas produces activity; the time required for the change increases as the preliminary exposure to oxygen is prolonged; if the preliminary exopsure exceeds a certain critical period, passivity persists for long periods after the oxygen has been removed. (4) The time needed for active stainless steel to become passive depends on the amount of oxygen introduced; below a certain concentration, it never becomes passive; above it, the reciprocal of the time needed is a rectilinear function of the oxygen added. The relation can be interpreted by taking the view that an oxide film is formed according to the logarithmic law. (5) The attack on stainless steel in 20% acid is increased by junction to carbon over which oxygen is passed; the direction of the current generated shows that the stainless steel is being drained of electrons which, according to the electron theory, should tend to render it passiv

ISSN:0021-8871    

DOI:10.1002/jctb.5010021004

出版商:John Wiley&Sons, Ltd    

年代:1952

数据来源: WILEY

摘要:

AbstractA convenient procedure is described for preparing pure xanthopterin, in 5‐g. quantities, from leucopterin synthesized from triamino‐4‐hydroxypyrim

ISSN:0021-8871    

DOI:10.1002/jctb.5010021005

出版商:John Wiley&Sons, Ltd    

年代:1952

数据来源: WILEY

摘要:

AbstractThe retention of metal is defined as the quantity bound by a given weight of wood, after washing out unchanged salt. The retention is shown to result from ion‐exchange with hydrogen ions and metal ions attached to hydroxyl and carboxyl groups occurring in natural constituents of wood. The effects of such variable factors as the concentration of treating solution, hydrogen‐ion concentration, species of wood, temperature, and nature of anion, have been studied.The use of copper and zinc acetates results in larger retentions of those metals. For this reason, copper acetate is suggested as a wood preservat

ISSN:0021-8871    

DOI:10.1002/jctb.5010021006

出版商:John Wiley&Sons, Ltd    

年代:1952

数据来源: WILEY

摘要:

AbstractApproximate data are given on the vapour pressures, in the range 10−1to 10−3mm. of mercury, of many of the cerium group of rare‐earth halides. The vapour pressures were determined by the method of molecular effusion. Also, a method is described for dehydrating these halides such that in their anhydrous form they are free from any basic salts and are 100% volatilein

ISSN:0021-8871    

DOI:10.1002/jctb.5010021007

出版商:John Wiley&Sons, Ltd    

年代:1952

数据来源: WILEY

摘要:

AbstractA Northumberland coal can be oxidized by nitric acid or by sodium hydroxide and oxygen under pressure to give a humic acid of empirical formula C3H2O. Since the apparent equivalent weight is 213, this corresponds to C12H8O4. This humic acid can be condensed with glycols and diamines to give hard, black infusible resins, which can be plasticized and filled in the usual manner. These resins are resistant to cold concentrated solutions of acids or alkalis, but can be hydrolysed on prolonged heating under reflux with dilute alkali. During condensation, more than theoretical amounts of water are released; the hardness and the carbon/hydrogen ratio of the product depends on the intensity of heating.

ISSN:0021-8871    

DOI:10.1002/jctb.5010021008

出版商:John Wiley&Sons, Ltd    

年代:1952

数据来源: WILEY

摘要:

Abstract1. A modification of the ‘short iodide’ method for the determination of copper in ore and concentrator products is described.2. A mixture of potassium iodide and sodium acetate is recovered from the titrated solutions and is used again.3. The modification coupled with suitable semi‐automatic apparatus permits the handling of large numbers of routine copper‐ore samples with considerable economy in time and r

ISSN:0021-8871    

DOI:10.1002/jctb.5010021009

出版商:John Wiley&Sons, Ltd    

年代:1952

数据来源: WILEY