摘要:

AbstractThe thermal decomposition of co‐precipitated alkaline‐earth carbonates, prepared in a manner similar to that used in the manufacture of oxide cathode coatings, has been studied by preparing a calcination series, under vacuum, up to 1200°. Samples were heated in the sorption balance, described previously, up to set temperatures, after which the specific surface and total pore volume of the cooled residue were calculated, using data obtained from the sorption of nitrogen at 77°. The results indicated that the co‐precipitated carbonates decompose in several distinct

ISSN:0021-8871    

DOI:10.1002/jctb.5010200301

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY

摘要:

AbstractA method for estimating the reactivity of ferric oxide in solid state reaction processes is proposed. The temperature of the emanation curve maximum is taken as a characteristic parameter for the testing of the reactivity.The reactivity of ferric oxides prepared from ferrous sulphate, Mohr's salt (ferrous ammonium sulphate), ferrous oxalate and basic carbonate of iron by decomposition at 700°, 900° and 1100° has been studied. The results of the proposed method are compared with those of specific surface and catalytic activity measurements. The method is more objective and representative of the compound's ability to react with other soli

ISSN:0021-8871    

DOI:10.1002/jctb.5010200302

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY

摘要:

AbstractA chrysotile asbestos having different surface finishes has been prepared by reaction of asbestos with silane coupling agents and chloro‐organosilanes. The type of bond formed between fibre and ‘finish’ has been investigated by infra‐red spect

ISSN:0021-8871    

DOI:10.1002/jctb.5010200303

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY

摘要:

AbstractThe application of a d.c. potential to kaolinite and halloysite pellets during firing under reduced pressure has been found to produce significant improvements in the hardness, tensile strength, and density of the product. Studies of these properties as a function of voltage, electrolysis time and temperature, and firing atmosphere are reported.X‐Ray and i.r. studies of mullite formation at the electrode faces indicate enhanced crystallinity at the negative electrode. The electrolysis mechanism is thought to involve the removal of residual protons normally present even at high temperature

ISSN:0021-8871    

DOI:10.1002/jctb.5010200304

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY

摘要:

AbstractA thin‐layer chromatographic (t.l.c.) method has been developed for the systematic identification of petroleum and coal‐tar oils and residues. The method is based on observation of varying chromatographic characteristics of the sample with different t.l.c. systems. The chromatograms are viewed under ultra‐violet light of 350 nm wavelength. By using a systematic table the nature of the sample may be determined to within narrow limits. The method has so far been successfully applied to water pollution control pro

ISSN:0021-8871    

DOI:10.1002/jctb.5010200305

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY

摘要:

AbstractThe kinetics of absorption of isobutylene in molten phenol,p‐cresol and pyrocatechol were studied in a stirred cell using concentrated sulphuric acid as a catalyst. The absorption of isobutylene in molten phenols was found to conform to pseudo‐first‐order mechanism. The products of various reactions were analysed by gas‐liquid chromatography.The absorption of isobutylene in mono‐t‐butyl derivatives of phenols was studied in an agitated glass reactor. It was possible to eliminate the effect of diffusion. The values for the rate constant of the second‐order reactions between isobutylene andp‐t‐butylphenol at 104°, isobutylene and 2‐t‐butyl‐p‐cresol at 70° and isobutylene and 4‐t‐butylpyrocatechol at 104° were 49, 40 and 56 ml/g mole/sec, respectively.Mass transfer influenced the rate of alkylation of phenol andp‐cresol with isobutylene in a bubble column. However, no significant improvement was observed in the yield of the mono‐derivative, which

ISSN:0021-8871    

DOI:10.1002/jctb.5010200306

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY

摘要:

AbstractA new method and apparatus are described for hydroperoxidation of organic compounds at the liquid/gas interface which is formed in a spirally curved tube. The energy required for stirring is removed, although extra energy is required for the compressors to enable the gas to provide the necessary agitation. The reaction rate should be higher than that in methods used at present.

ISSN:0021-8871    

DOI:10.1002/jctb.5010200307

出版商:John Wiley&Sons, Ltd    

年代:1970

数据来源: WILEY