摘要:

AbstractIn this communication it will be shown, that, whether the principle of countercurrent is applied or not, the quantities of material to be treated in a continuous process of separation may always be expressed as functions of the compositions of raw material and of the phases that are separated in the various stages of separation, i.e. it will be shown that a comparison of the economy of various processes of separation is always possible as soon as a diagram of separation has been determined.An example, wherein transition from one stage of separation up to another takes place continuously, will be worked out.

ISSN:0165-0513    

DOI:10.1002/recl.19370560602

出版商:WILEY‐VCH Verlag    

年代:1937

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19370560603

出版商:WILEY‐VCH Verlag    

年代:1937

数据来源: WILEY

摘要:

AbstractResearch work with the new colloidal nickel catalyst described in Rec. trav. chim. 55, 854 (1936) has been continued. The selectivity of the hydrogenation has been studied and the reaction products compared with the products obtained with other catalysts. The colloidal nickel catalyst can be absorbed on active carbon although the catalyst thus obtained is somewhat less active.

ISSN:0165-0513    

DOI:10.1002/recl.19370560604

出版商:WILEY‐VCH Verlag    

年代:1937

数据来源: WILEY

摘要:

AbstractThe proof given by Krafft for the terminal position of the double bond in cetene is not complete, as during the formation of cetyne‐1 from cetene dibromide the possibility was not precluded of a rearrangement under the influence ofpowderedKOH.In the present paper it is demonstrated that: 1. This rearrangement does not take place; 2. During the preparation of cetyne‐2 from cetene dibromide under the influence ofalcoholicKOH cetyne‐1 is the first reaction product.This conclusively shows that cetene is hexadec

ISSN:0165-0513    

DOI:10.1002/recl.19370560605

出版商:WILEY‐VCH Verlag    

年代:1937

数据来源: WILEY

摘要:

AbstractUnlike 1:2‐dibromoethane and 1:3‐dibromopropane one mol of 1:5‐dibromopentane reacts with one mol of 1:2‐diaminoethane even when a large excess of the latter is present. 1‐(2′‐Aminoethyl)‐pyperidine is formed and this compound, an example of a combination of a tertiary and a primary amine has been investigated. Its derivatives obtained with benzoyl chloride, phenyliso‐cyanate and with phenyl iso‐thiocyanate, still react basic.Condensation with benzaldehyde and reduction of the derivative so obtained, gives a benzylated product, a tertiary‐secondary diamine which is markedly less basic and give

ISSN:0165-0513    

DOI:10.1002/recl.19370560606

出版商:WILEY‐VCH Verlag    

年代:1937

数据来源: WILEY

摘要:

AbstractErsatz eines H‐Atoms der CH2Cl‐Gruppe in 11‐Chlor‐1,2,4,6‐tetramethylbenzen (Mesitylchlormethan) durch einen zweiten Mesitylrest erhöht die Reaktionsfähigkeit des Cl‐Atoms. Das Dimesitylchlormethan gleicht (in Leitfähigkeit im flüssigen Schwefeldioxyd, Halochromie und Möglichkeit zu Radikalbildung) dem Trip

ISSN:0165-0513    

DOI:10.1002/recl.19370560607

出版商:WILEY‐VCH Verlag    

年代:1937

数据来源: WILEY

摘要:

Abstract1:2‐Bis‐(phenylamino)‐ethane and N.N′‐diphenylpiperazine are produced by the interaction of aniline and 1:2‐dibromoethane. The nitration and halogenation of various nitro‐, halogeno‐ and acetyl derivatives of 1:2‐bis‐(phenylamino)‐ethane are described. The nitration of the bye‐products, the N.N′‐diphenylpiperazine derivatives, is also discussed. In this case the piperazine ring is opened, so that thesame nitration productsare obtained from either 1:2‐bis‐(phenylamino)‐e

ISSN:0165-0513    

DOI:10.1002/recl.19370560608

出版商:WILEY‐VCH Verlag    

年代:1937

数据来源: WILEY

摘要:

AbstractDurch geeignete Arbeitsweise ist eine praktisch vollständige Isolierung des Cystins aus Rosshaar zu erreichen. Der Schwefelgehalt stammt völlig aus dem Cysti

ISSN:0165-0513    

DOI:10.1002/recl.19370560609

出版商:WILEY‐VCH Verlag    

年代:1937

数据来源: WILEY

摘要:

AbstractFrom the colloid chemical standpoint it is of interest with regard to light pressure that (a) the actual light pressure of the visible spectrum cannot be detected in colloidal solutions with the means available at present, (b) the results of the researches of Ehrenhaft and his co‐workers give but little information regarding the true light pressure, (c) the radiation of the nearest infra red can produce characteristic heat effects in colloidal solutions (such effects are usually grouped under the name of radiometer action), (d) the photophoresis effect observed by Barkas in sols is to be attributed to such a radiometer effect, (e) the transparency of water to the nearest infra red is frequently incorrectly left out of account, (f) in rendering the Brownian movement visible account must be taken of a possible movement caused by a radiometer effect, (g) in carrying out settling experiments, i. e. determination of the particle size by the sedimentation method using Stokes' law, attention must be paid to the influence of heat effect

ISSN:0165-0513    

DOI:10.1002/recl.19370560610

出版商:WILEY‐VCH Verlag    

年代:1937

数据来源: WILEY

摘要:

AbstractThe ultra‐violet absorption spectra of pyridine and 27 of its derivatives have been quantitatively measured. The possible errors have been calculated in every case. Some general remarks concerning the data and their interpretation are given.The pyridine derivatives investigated comprise six mono‐ and nine dihalogenated pyridines, the three mono amino‐pyridines, three amino‐halogeno‐pyridines, three dipyridyls, two dipyridylamines and a tripyr

ISSN:0165-0513    

DOI:10.1002/recl.19370560611

出版商:WILEY‐VCH Verlag    

年代:1937

数据来源: WILEY