V O L U M E 21, NO. 8, A U G U S T 1 9 4 9
1017
C
C
&
Form and Habit. From fusion elongated rods parallel to direction of gron-th (assumed c). Interfacial Angles (Polar). 64", 123". PROPERTIES (determined by W,C. McCrone). OPTICAL Refractive Indeses (5893 A.; 25'C.). a = 1.562. p = 1.707. y = 1.78 (calcd.). (Note. a and p as listed are the Cargille liquids which when saturated with o-aminobenzoic acid cause the crystals to disappear in those positions.) Optic Asial ringles ( 2 5 " C.). 2V = 68" (blue); 73" (yellotT); 75' (red). Dispersion. Very strong crossed disprision, r > v . Optic Asial Plane. 1 010. Sign of Double Refraction. ( - ). Acute Bisectrix. h. Estinction. p = 33 O from length. Fr510s DATA(determined by IT. C. lIcCrone). o-.kminobenzoic acid melts a t 145' C. with sublimation. The melt solidifies spontaneously on cooling. The crystals are alivays those of modification 111; they are characterized b\- large gas bubbles (Figure 1 ) and strong dispersion. The latter is manifest on those views showing an acute bisectriv interference figure; 2V = 68" (blue); 73" (yellow); 75" (red); ( - ) .
I
I
-a
B
LITERATURE CITED
(1) Groth, "Chemische Kiistallographie," T'ol. 4, p. 508, Leipaig C
Eneelmann. 1910.
I
(2) Kitaiiorodski, Iroest. A k a d . Vaitk. T..S.S.R. Atdel. Khim. S a i i k . . 1948, 278-89.
CORRECTION.I n the papcr entitled "hficroecope Hot Stage" by F. IT. Matthews [.\?;XI.. C"E\f., 20, 1112 11948)lTableI, page 11 15, "anthraquinone" should read "anthracene." F. \.T'. ?rf.4TTHERS
Figure 2.
Evaluation of Catalysts for Catalytic Cracking
u-Aminobenzoic Acid
Orthographic projections for modifications I ( u p p e r ) and 11 ( l o w e r )
c.
x - R . 4 ~ DIFFRACTIOX DATA(determined by IT. llccrone, J. Whitney, and I. Corvin)., Cell Dimensions. a = 11.66 A.; h = 16.04 A.; c = 7.18. Formula Weights per Cell. 8. Formula Weight. 137.13. Density. 1.367 ( 1 ) . d 8.21 6.42 6.16 5.38 4 74 4 37 4 11 3 96 3 76 3 66 3 56
Principal Lines I1Il 0.11 0.24 0.30 0.25 0.52 0.06 Very weak Very weak 0.18 1 00 Very weak
d
I111
3.38 3.21 3.01 2.92 2.64 2.53 2.48 2.44 2.40 2.32 2.27
0.12 0.36 Very weak 0.53 0.18 Very v e a k 0.11 Very weak Very weak Very v e a k 0.11
OPTICALPROPERTIES (deterFined by W.C. McCrone). Refractive Indexes (5893 A.; 25" C.). a = 1.560. p = 1.73. y = 1.76. Optic Axial Angles (25" C , ) . 2 8 = 46" (D). 2E = 84 (D); 81" (blue).; 85" (red); 7S1/zo(yellow); 73" (blue) ( 2 ) . Dispersion. r > v. Optic Axial Plane. 001. Sign of Double Refraction. ( ). Acute Bisectrix. b. hlolecular Refraction ( R )(5893 i.; 25' C.). = 1.68. R (calcd.) = 36.8. R (obsd.) = 37.9.
-
o-AMINOBENZOIC ACID 111
CRYSTALMORPHOLOGY (determined by IT. C. McCrone). Crystal System. llonoclinic.
SIR: I n the article by Rescorla, Ottenweller, and Freeman iAs.4~. CHEM.,20, 196 (1948)l we note some data given for iiatural catalyft which may be in error. 1. I n Table I the natural catalyst density aerated is given as 49.1 pounds per cubic foot, and free settled density as 46.5. The values would be about right were they interchanged. 2. I n Table I1 the sodium oxide content of natural catalyst is given as 0.32%. We believe this value is erroneously high. I n the same table the iron content is given as a 0.32% FeyOl. This value is apparently erroneously low. It appears that a typographical error is involved, as the iron and sodium contents in the case of both synthetic and natural are given as equivalent. 3. In Table 111 the sodium oside content of natural catalyst appears erroneously high, and we do n o t agree that the cracking activity data given are typical of the average natural catalyst from fluid cracking units. In this case the data may be correct because of certain characteristics of the oil fwd Atoclc to the unit in question. 4. At the bottom of page 200, the volatile matter contcnt of new natural catalyst is given as 25% when subjected to heat treatment at 850" F. .4ctually it would be espected t o test bctween 17 aiid 20% on such heat treatment. R. B. SECOR Filtrol Corporation Los .ingeles, Calif. ,SIP, :
hclmon ledging our negligence in ansivering the comments
of L)i . Semi we discuss them in the order listed in his letter of .lpiil 29. 1918, t o >mu. ~
1018 1,
ANALYTICAL CHEMISTRY This is correct and the columii should read: Aerated Freely settled Compacted Pressure, 5 pounds per square inch
Catalyst Densities, Natural. Pounds per Cubic Foot 46.5 49.1 55.7
R4.6
2. Rather than go back to the data at the time the paper was written, we have averaged some recent chemical analyses of natural catalyst. These results are: New S a t u r a l Catalyst, %
Sodium, Na,O Iron. FepOa
0 . 17
1.23
It is probable that t h e iron writerit should have rrwl 1.32%.
Kvalitativni Chemicka Analysa (Qualitative Chemical Analysis). Jindm’ch H . Krepelka. xii 341 pp. Czechoslovak Chemical Society, Prague, Czechoslovakia, 1947. Price, 275 Czechodovak crones (bound).
+
This book is One Of the recent and trxts O n qualitative analytical procecures published in the Czech language. Krepelka has been professor of inorganic chemistry at the Charles University in Prague since 1931 and since 1938, dean of the faculty of natural sciences. His postgraduate work included studies under the direction of the prominent American scientist, T. K. Richards, a t Harvard ITniversity during 1919 and 1920. In recognition of his contributions to science, he was awarded the distinguished honor of membership in the Czech Academy of Science and Arts. Krepelka is not only well known for his outqtanding publications and teaching, but has also gained n ideqpread recognition for his proficiency and valuable work in legal chemistiy, a field in xhich he has worked untiringly since 1923. This book consists of five major parts. I n the first 7 pages the author discusses blowpipe analytical procedures and describes methods of preliminary tests for cations and anions, followed by 10 pages devoted to a discussion of the solubility characteristics of inorganic compounds. I n 179 pages he discusses the group separation of cations and anions, followed by a systematic procedure for the qualitive analysis of inorganic compounds. I n the last two sections the author discusses identification methods for organic substances of toxic nature and the last 29 pages present tables of physical constants and a list of the reagents employed. The material is clearly presented and illustrated by several figures and photographs.
3. The choice of the word “typical” may not have t)et.li accurate, as this natural catalyst was used in a cracking unit charging deasphalted gas oil possessing considerable catalystcontaminating characteristics. Thus the properties of the regenerated synthetic and natural catalysts are not comparable for a given operation. The sodium oxide content of recent samples has averaged 0.37% IL’a20. 4. Actually the new natural catalyst, as received, does test between 17 and 20%, or even lower, with 850” F. heat treatment. However, the sample after handling and elutriation with air (not completely dry) may contain more water. J. H. OTTENWELLER Cities Service Refining C o r p o r a t i o n L a k e Charles, La.
This hook was w i t t e i i primarily for university studeuts, tiut he helpful also to thp prac.tic.inp analytical chemist. A. LASSLO
will
Table of Reagents for Inorganic Analysis. C. J , uarb A ~ i e ~ r ~ ~ ~ e n burg and P. E. TVenger. xi 201 pages. Academic Press, Inc., 125 East 23rd St., New N. \,. Price,
+
The third report of the International Commission on New .4nalytical Reactions and Reagents of the International Union of Chemistry is the successor to the first report, published in 1938 by C. J. van NieuxTenhurg, K. Bottger, F. Feigl, A. S. Komarovsky, and N. Strafford. I t is presented in the identical tabular form of the first report, in French, English, and German, and employs the same system of abbreviations. I t covers the period 1937 to 1947 and lists some 1373 reactions, including additional references on previously described tests that are numerically designated to correspond with those given in the first report. There are new chapters on europium, ytterbium, hydroxylammonium, hydrazinium, silicofluoride, carbon oxychloride (phosgene), chlorite, sulfur dioxide, hydrogulfate, dithionate, water, and hydrogen dioxide. The treatment in this volume is comprehensive, like that of the first report, rather than critical and selective, as was the second report, issued in 1945 [ANAL.CHEY.,19, 697 (1947)l. The volume is issued in the name of the commission, of which van Nieuwenburg and Wenger are, respectively, president and secretary. The compilation was prepared by Clement DuvaI, also a member of the commission.
Division of Analytical and Micro Chemistry List nf Speakers F O R the second successive year the Division of Analytical and >licro Chemistrp through its Committee on Speakers has prepared a list of speakers on analytical topics and is planning to iend copies of the list to secretaries of local sections in the belief that it will be of assistance to them in planning meetings of maximum interest to their members. Absorption Spectroscopy 9. E. Q.ASHLEY,General Electric Co., Pittsfield, Mass. h. 0 . BECKMAN, Laboratories of h.0 . Beckman, Pasadena 2, Calif.
R. R. BRATTAIN, Shell Development Co., Emeryville 8, (’alif bf. G. I f E L L O N , Purdue University, Lafayet be, Ind. and Of Ancient E. R. CALEY,Ohio State University, Columbus 10, Ohio hi. FARXS\%-ORTH, l f e t a l and Thermit Corp., Rahway, N. ,J Chromatography R. KUXIX,Rohm & Haas Co., Philadelphia, Pa. H. H. STRAIIG, Carnegie Institute of Washington, Staniord, Calif. W.H. STEIIG,Rockefeller Institute, Sew York, T.Y. L. ZEcHrmIsTER, California Institute of Technology, Pasadena, Calif.
