摘要:

AbstractPartly in connection with an intended revision of the ring analysisJ. C. Vlugter, H. I. Waterman and H. A. van Westen, J. Inst. Petroleum Tech.21, 661 (1935); see also Dissertation Vlugter, Delft 1932), partly on account of difficulties encountered in practice to obtain reproducible results with the cryoscopic molecular weight determination with naphthalene as solvent, the sources of error inherent to the latter method were subjected to systematic study. As a result of this investigation a method was developed guaranteeing better reproducibility of results.The large number of precautions which are necessary for obtaining good check values with this modified method, induced us, however, to look out for other methods to determine the molecular weight of oils, the results of which can be reproduced better and in a shorter time, with less trouble. An ebullioscopic method, the apparatus and details of which are described in the second part of this publication, proved to answer the purpose quite satisfactorily.This last‐named method was tested by measuring the molecular weight of some pure hydrocarbons of different type, while also some experimental material was collected for oils of different chemical composition and molecular weight.Finally, the results of both methods, obtained with seven oil fractions, were compare

ISSN:0165-0513    

DOI:10.1002/recl.19420610502

出版商:WILEY‐VCH Verlag    

年代:1942

数据来源: WILEY

摘要:

AbstractAbleitung einer Näherungsformel, welche den Wasserdampfgehalt eines Gases nach Durchführung durch eine Trockenanlage als Funktion von Rohrlänge, Gasgeschwindigkeit, Druck und Temperatur angibt.Die Formel steht in befriedigender Übereinstimmung mit vorliegenden Daten.Praktische Angaben für technische Berechnu

ISSN:0165-0513    

DOI:10.1002/recl.19420610503

出版商:WILEY‐VCH Verlag    

年代:1942

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19420610504

出版商:WILEY‐VCH Verlag    

年代:1942

数据来源: WILEY

摘要:

AbstractExperimental conditions for obtaining a reproducible texture with [100]//fibre axis for electrolytically deposited nickel. Difference in character between layers, deposited on polished and on etched copper, ‐ Texture of nickel deposited on recrystallized nickel iron strip with cube texture. Oriented oxidation of nicke

ISSN:0165-0513    

DOI:10.1002/recl.19420610505

出版商:WILEY‐VCH Verlag    

年代:1942

数据来源: WILEY

摘要:

AbstractA new method for the determination of lactoflavin in cereals and urine has been developed. Cereal products are extracted with 2 n alcoholic hydrochloric acid, the extract purified by extraction with phenol, adsorption with PbS and elution with a saturated NaCl solution, the extinction of a phenolic extract in which lactoflavin does not fluoresce then being determined in the step‐photomete

ISSN:0165-0513    

DOI:10.1002/recl.19420610506

出版商:WILEY‐VCH Verlag    

年代:1942

数据来源: WILEY

摘要:

AbstractPour étudier les qualités physiologiques des produits en question, nous avons préparé les produits décrits ci‐après.Ayant réduit l'acide γ‐anisoyl‐n.butyrique, CH3O. C6H4. CO(CH2)3. COOH, nous avons obtenu la lactone de l'acide δ‐p.méthoxyphényl‐δ‐hydroxy‐nvalérique,l'acide 5,6‐di‐p‐méthoxyphényl‐5,6‐dihydroxy‐sébacique,et l'acide δ‐p.méthoxyphényl‐n.valérique, CH3O. C6H4(CH2)4. COOH, décrit dans un mémoire précédentJ. M. van der Zanden, Rec. trav. chim.60, 292 (1941).).La réduction de l'oxime nous a donné l'acide δ‐p.méthoxyphényl‐δ‐amino‐nvalérique, CH3O. C6H4. CH(NH2). (CH2)3. COOH. le lactame correspondant.puis la 2‐anisyl

ISSN:0165-0513    

DOI:10.1002/recl.19420610507

出版商:WILEY‐VCH Verlag    

年代:1942

数据来源: WILEY

摘要:

AbstractBeschrieben wird die Herstellung von Monoacylglykolen durch reduktive Detritylierung von Acyl‐tritylglykolen mit Wasserstoff in alkoholischer Lösung in Gegenwart von Palladium‐K

ISSN:0165-0513    

DOI:10.1002/recl.19420610508

出版商:WILEY‐VCH Verlag    

年代:1942

数据来源: WILEY

摘要:

AbstractIn the bromination of phenol at temperatures between 200° and 500° monobromophenol and more highly brominated products are formed. By means of a special method of analysis the ratio is determined in which ortho, meta and para‐bromophenol occur in the reaction mixture. Meta‐bromophenol is formed to a very small degree at all temperatures; the ratio of ortho to para‐bromophenol becomes larger with increasing temp

ISSN:0165-0513    

DOI:10.1002/recl.19420610509

出版商:WILEY‐VCH Verlag    

年代:1942

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19420610501

出版商:WILEY‐VCH Verlag    

年代:1942

数据来源: WILEY