The
`
`. Condensed Chemical
`Dictionary
`
`«(k
`II/
`NINTH EDITION mm
`
`Revised by '
`
`GESSNER G. HA WLE Y
`
`Coeditor, Encyclopedia of Chemistry
`Coauthor, Glossary of Chemical Terms
`
`02/;
`
`.25$1 1323;
`
`rm 73¢ izccs‘
`
`Page 1 of 5
`
`FORD 1223
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`

`

`
`
`Van Nostrand Reinhold Company Regional Offices:
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`Copyright © 1977 by Litton Educational Publishing, Inc.
`
`Library of Congress Catalog Card Number: 76-19024
`ISBN: 0—442-23240-3
`
`All rights reserved. Certain portions of this work copyright © 1930, 1920, 1919 by
`The Chemical Catalog C0,, Inc. and 197], 1966, 1956, 1950 by Litton
`Educational Publishing, Inc. No part of this work covered by the copyright hereon
`may be reproduced or used in any form or by any means—graphic, electronic, or
`mechanical, including photocopying, recording, taping, or information storage
`and retrieval systems—without permission of the publisher.
`
`Manufactured in the United States of America
`
`Published by Van Nostrand Reinhold Company
`450 West 33rd Street, New York, N.Y. 10001
`
`Published simultaneously in Canada by Van Nostrand Reinhold Ltd.
`
`1514131211109876543
`
`Library of Congress Cataloging in Publication Data
`Main entry under title:
`
`The Condensed chemical dictionary.
`
`Page 2 of 5
`
`FORD 1223
`
`

`

`sidual oil in the cake is obtained by solvent extrac-
`tion.
`
`Chief constituent: Ricinolein (glyceride of ricinoleic
`acid).
`Grades: U.S.'P. No. 1; No. 3; refined; F.C.C.
`Containers: Bottles; drums; tanks.
`Hazard: Develops heat spontaneously.
`Uses: Plasticizcr in lacquers and nitrocellulose; pro-
`duction of dibasie acids;
`lipsticks; polyurethane
`coatings, elastomers
`and adhesives;
`fatty acids;
`surface-active agents; hydraulic fluids; pharmaceuti—
`cals;
`industrial lubricant; electrical insulating com-
`pounds; mfg. of Turkey Red oil (q.v.); source of
`sebacic acid and of ricinoleates; medicine (laxative).
`See also castor oil, dehydrated; blown oil.
`
`castor oil, acetylated. See glyceryl triacetylricinoleate.
`castor oil acid. _See ricinoleic acid.
`
`eastor oil, blown. See blown oil.
`
`castor oil,‘ dehydrated (DCO). A castor oil from which
`about 5% of the chemically combined water has been
`removed, and which as a result, has drying properties
`similar to those of tung oil. Dehydration is carried
`out commercially by heating the oil in the presence
`of catalysts, such as sulfuric and phosphoric acids,
`clays, and metallic oxides. The commercial product
`is offered in a wide range of viscosities and analytical
`constants. Used in protective coatings and alkyd
`resms.
`
`tri-12—
`castor oil, hydrogenated. Principally glyceryl
`hydroxystearate (q.v.). A hard, waxy product used in
`making hydroxystearic acid.
`
`See castor oil, dehydrated.
`
`castor oil, polymerized. A rubber-like polymer results
`from combination of castor oil with sulfur or diiso-
`cyanates;
`this can be blended with polystyrene to
`give a tough, impact-resistant product.
`castor oil, sulfonated. See Turkey red oil.
`
`castor seed oil meal (castor cake; castor meal). The
`residue from extraction of oil from the cat tor seed
`(ricinus). The normal product contains 29.5% crude
`protein; 35.8% crude fiber; 13.2% nitrogen-free ex-
`tract and 1.0% crude fat. The total digestible nutri-
`ents approximate 25%. The ash content of 7.5% is
`high in potash and phosphate.
`'
`Containers: Bag or bulk; carlots.
`Hazard: Contains highly toxic ricin which must be
`removed before internal use.
`Use: Animal feeds (after removal of toxic ingredi-
`ents); fertilizer.
`
`“Castorwaxfno2 Trademark for hydrogenated castor
`oil, the triglyceride of lZ—hydrox'ystearic acid.
`Properties: White, hard, 'synthetic wax; m.p. 85°C;
`Sp. gr. 0.9990 (25°C); acid value 2; iodine value 3;
`saponification value 180;
`insoluble in most organic
`solvents at room temperature and compatible with
`ethylcellulose, cellulose acetate butyrate, polyethylene
`(up to 25%), polymethacrylate, rosin, shellac, natural
`and synthetic rubbers, insect and vegetable waxes.
`Uses: Potting compounds, greases, sealants and im-
`pregnating compositions; wax blends where increase
`in grease and solvent resistance, hardness and melt:
`ing point is desired; blending agent and viscosity re-
`ducer in hot melts; direct application to paper for
`resistance to moisture and fat.
`
`171
`
`CATALYST
`
`catalase. An oxidizing enzyme occurring in both plant
`and animal cells. It decomposes hydrogen peroxide.
`It can be isolated and is used in food preservation
`(removing oxygen in packaged foods) and in decom-
`posing residual hydrogen peroxide in bleaching and
`oxidizing processes.
`'
`
`“Catalin.”353 Trademark for a phenolformaldehyde
`resin. Nonflammable.
`Uses: Miscellaneous molded articles.
`
`catalysis.-0ne of the most important phenomena in
`nature, catalysis is the "loosening" of the chemical
`bonds of two (or more) reactants by another sub-
`stance, in such a way that a fractionally small per-
`centage of the latter can greatly accelerate the rate of
`the reaction, while remaining unconsumed. (See cat-
`alyst). Thus one part by volume of catalyst can acti—
`vate thousands of parts of reactants. Though the
`mechanism of their action is not completely known,
`the electronic configuration of the surface molecules
`of the catalyst is often the critical factor. The sur-
`face irregularities give rise to so-called “active points,”
`at which intermediate compounds can form. Most
`industrial catalysis is performed by finely divided
`transition metals or their oxides.
`Solid catalysts may combine chemically (bond) at
`the surface with one or more of the reactants. This
`is known as chemisorption, and occurs on only a
`small portion of the catalyst surface (i.e., at the ac-
`tive points); it results in changing the chemical na—
`ture of the chemisorbed molecules. Catalysis of chem—
`ical reactions by surfaces must proceed by chemi-
`sorption of at least one of the reactants.
`See
`also catalyst;
`chemisorption; hydrogenation;
`enzyme.
`
`catalysis, heterogeneous. A catalytic reaction in which
`the reactants and the catalyst comprise two separate
`phases, e.g., gases ovor solids, or liquids containing
`finely divided solids as a disperse phase.
`
`catalysis, homogeneous. A catalytic reaction in which
`the reactants and the catalyst comprise only one
`phase, e.g., an acid solution catalyzing other liquid
`components.
`
`catalyst. Any substance of which a. fractional per-
`centage notably affects the rate of a chemical reac-
`tion without itself being consumed or undergoing a
`chemical change. Most catalysts accelerate reactions,
`but a few retard them" (negative catalysts or inhib-
`itors). Catalysts may be inorganic,“ organic, or a
`complex of organic groups and metal halides (sec
`catalyst, stereospecific). They may be either gases,
`liquids, or solids. In some cases their action is dc~
`structive and undesirable, as in the oxidation of iron
`to its oxide, which is catalyzed by water vapor, and
`similar types of corrosion. The -life of an industrial
`catalyst varies from 1000 to 10,000 hours, after
`which it must be replaced or regenerated.
`Note: Though it
`is not a “substance,” light in the
`visible wavelengths can act as a catalyst, as in photo-
`synthesis and other photochemical reactions.
`Following is a partial list of catalysts; the asterisk
`indicates a destructive effect.
`
`Substance
`aluminum chloride
`
`Reaction type
`condensation (Friedel—
`Crafts)
`
`Page 3 of 5
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`FORD 1223
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`

`

`CATALYST, NEGATIVE
`
`172
`
`Substance
`aluminum oxide
`ammonia
`chromic oxide
`
`cobalt
`
`copper salts
`hydrogen fluoride
`
`.
`
`iron
`
`iron oxide
`
`manganese dioxide
`molybdenum oxide
`
`nickel
`phosphoric acid
`
`platinum metals
`
`silica-alumina
`silver
`sulfuric acid
`vanadium pentoxide
`water (esp. + NaCl)
`
`Reaction type
`hydration; dehydration
`condensation (polymers)
`methanol synthesis; aro—
`matization; polymeriza-
`tion
`hydrocarbon synthesis;
`Oxo process
`oxidation (of rubber)*
`alkylation; condensation;
`dehydration; isomeriza-
`tion
`ammonia synthesis; hydro-
`carbon synthesis
`dehydrogenation (oxida-
`tion)
`oxidation
`dehydrogenation; poly-
`merization; aromatiza—
`tion; partial ox1dation
`hydrogenation (oils to fats)
`polymerization; isomeriza—
`tion
`
`hydrogenation; aromati—
`zation
`cracking hydrocarbons
`hydration; oxidation
`isomerization; corrosion*
`oxidation (sulfuric acid)
`oxidation (corrosion)*
`
`(diallyldimethylammonium chloride).
`“Cat-Floc”'°°
`Trademark for a quaternary ammonium polymer.
`Derivation: Monomer in water solution is mixed with
`catalytic amount of butylhydmperoxide and kept at
`50—75°C for 48 hours; the solid formed is taken up
`in water, precipitated, and washed with acetone.
`Uses: Flocculating agent;
`textile spinning aid; anti-
`static agent; wet-strength improvers in aper; rubber
`accelerators; curing epoxy resins; su actants; bac—
`teriostatic and fungistatic agents.
`cathode. The negative electrode of an electrolytic cell,
`to which positively charged ions migrate when a cur-
`rent is passed, as in electroplating baths. The cathode
`is the source of free electrons (cathode rays) in a
`vacuum tube. In a primary cell (battery), the cathode
`is the positive electrode. See also anode; electrode.
`cathode sputtering. See sputtered coating.
`cation. An ion having a positive charge. Cations in a
`liquid subjected to electric potential collect at the
`negative pole or cathode.
`
`cation exchange. See ion exchange.
`cationic reagent. One of several surface-active sub-
`stances in which the active constituent is the positive
`ion. Used to flocculate and collect minerals that are
`not flocculated. by oleic acid or soaps (in which the
`surface-active ingredient
`is the negative ion). Re—
`agents used are chiefly quaternary ammonium com—
`pounds e.g., cetyl trimethyl ammonium bromide.
`
`catlinite (pipestone). A fine-grained silicate mineral
`related to pyrophyllite which is easily compressible,
`has high surface friction, and is used for gaskets in
`very high—pressure equipment.
`
`cationic derivative of
`a
`“Cato.”3 Trademark for
`starch, available in ungelatinized or gelatinized (cold
`water soluble) form. Used in manufacture of paper,
`warp sizing, etc.
`
`Catalysts are highly specific in their application;
`they are widely used in the petroleum-refining, syn-
`thetic organic chemical and pharmaceutical indus-
`tries. For details of application, see the preceding
`list. Since the activity of a solid catalyst
`is often
`centered in a small fraction of its surface, the num—
`ber of active points can be increased by adding pro~
`moters (q.v.), which increase the surface area in one
`way or another, e.g., by increasing porosity. Cata— “Cat-0x3“ Proprietary catalytic oxidaton process
`lytic activity is decreased by substances that act as
`for removing sulfur dioxide and fly ash from stack
`gases and converting the former to sulfuric acid. It
`poisons (q.v.), which clog and weaken the catalyst
`surface, e.g.,
`lead in the catalytic converters used
`involves passing the flue gases at 900°F (1) through
`to control exhaust emissions.
`an electrostatic precipitator, (2) through a converter
`where sulfur dioxide is oxidized to the trioxide with
`vanadium pentoxide, (3) through heat exchangers to
`cool the gases so that the SO; combines with water
`vapor, and (4) through an absorbing tower which
`condenses the sulfuric acid. Cbmmercial acid (70%)
`is made in this way. See also sulfuric acid.
`caulking compound. See sealant.
`
`Besides inorganic substances, there are many or-
`ganic catalysts that are vital in the life processes of
`plants and animals. These are called enzymes (q.v.)
`and are essential in metabolic mechanisms, e.g., pep-
`sin in digestin. Vitamins and hormones also have
`mtalytic properties. See also catalysis; catalyst,
`stcrc05pccific; enzyme.
`catalyst, negative. See inhibitor.
`
`'
`
`catalyst, organic. See enzyme.
`
`stereospecific. An organometallic catalyst
`catalyst,
`which permits control of the molecular geometry of
`polymeric molecules. Examples are Ziegler and Natta
`catalysts derived from a transition metal halide and a
`metal alkyl, or similar substances. There are many
`patented catalysts of this general type, most of them
`developed in connection with the production of poly
`propylene, polyethylene, or other polyolefins. See also
`polymer,
`stereospecific; Natta
`catalyst; Ziegler
`catalyst.
`
`catalyst, thermonuclear. See carbon cycle (2).
`catechol. See pyrocatechol.
`
`this term usually refers to
`caustic. (l) Unqualified,
`caustic soda (sodium hydroxide). (2) As an adjective,
`it
`refers to any compound chemically similar to
`sodium hydroxide, e.g., caustic alcohol (C2H50Na).
`(3) Any strongly alkaline material Which has a corro-
`sive or irritating effect on living tissue.
`caustic baryta. See barium hydroxide.
`causticized ash. Combinations of soda ash and caustic
`soda in definite proportions marketed for purposes
`where an alkali is needed ranging in causticity be-
`tween the two materials. Causticized ash is usually
`designated by its caustic soda content and the range
`of standard marketed products embraces 7%, 10%,
`15%, 25%, 36%, 45%, and 67% of caustic soda.
`
`Page 4 of 5
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`FORD 1223
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`

`

`817
`
`STOKES’ LAW
`
`two methyl groups and an aliphatic side-chain at-
`tached to the nucleus. The length of the side—chain
`varies and generally contains 8, 9 or 10 carbon atoms
`in the sterols, 5 carbon atoms in the bile acids, 2 in
`the adrenal cortical steroids, and none in the estrogens
`and androgens. Steroids are classed as lipids because
`of their solubility in organic solvents and insolubility
`in water.
`.
`Most of the naturally occurring sterords have been
`synthesized and many new sterords. unknown in na-
`ture have been synthesized for use in medium, such
`as the fluorosteroids (dexamethasone).
`sterol. A steroid alcohol. Such alcohols contain the
`common steroid nucleus, plus an 8 to lO-carbon—atom
`sidevchain and a hydroxyl group. Sterols are widely
`distributed in plants and animals, both in the free
`form and esterified to fatty acids. Cholesterol (q.v.)
`is the most
`important animal stero]; ergosterol is
`an important plant sterol (phytosterol).
`“Sterosan.”2'9 Trademark for a brand of chlorquinal-
`dol (q.v.).
`
`“Sterox.”$8 Trademark for a series of nonionic sur-
`face-active agents including polyoxyethylene ethers,
`and polyoxyethylene thioethers.
`
`STH. See somatotropic hormone.
`
`stibic anhydride. See antimony pentoxide.
`stibine. See antimony hydride.
`
`stibium. The Latin name for the element antimony;
`hence the symbol Sb.
`
`stibnite (gray antimony; antimony glance; antimonite)
`Sb283.
`to blackish
`Properties: Lead gray mineral; subject
`tarnish; metallic luster. Soluble in concentrated boil-
`ing hydrochloric acid with evolution of H28. Sp. gr.
`4.52—4.62; Mohs hardness 2.
`Occurrence: Japan; China; Mexico; Bolivia, Peru,
`South Africa.
`'
`
`Use: The most important ore of antimony.
`
`stibo hen CI2H4Na501684$b - 7H20. Sodium antimony
`II
`is(catechol—2,4-disulfonate) heptahydrate.
`Properties: White, crystalline, odorless powder. Af-
`fected by light. Freely soluble in water, nearly insol-
`uble in alcohol, ether, and chloroform.
`K
`Derivation: Reaction of sodium pyrocatechol-3,5—di-
`sulfonate with antimony trioxide and precipitating
`with alcohol.
`Grade: U.S.P.
`Use: Medicine.
`
`stigmasterol C29H430 ' H20. A plant sterol.
`Properties: Anhydrous form has m.p. of 170°C. In-
`soluble in water; soluble in usual organic solvents.
`Combustible.
`.
`Derivation: From soy or calabar beans.
`Uses: Preparation of progesterone and other impor-
`tant steroids.
`
`stilbene (toluylene; trans form of alpha, beta-diplienyl—
`ethylene) C6H5CH:CHC6 H5.
`Properties: Colorless or slightly yellow crystals; sp.
`gr. 0.9707; mp. 124—125°C; b.p. 306—307” C. Soluble
`in benzene and ether; slightly soluble in alcohol; in-
`soluble in .water. Combustible.
`Derivation: By passing toluene over hot lead oxide.
`
`Grades: Technical; pure.
`Uses: Manufacture of dyes and optical bleacheS'
`crystals are used as phosphors and scintillators.
`,
`Note: The cis form of alpha, beta—diphenylethylene
`(isostilbenc),
`is a yellow oil; b.p. 145°C (13 mm)-
`m.p. l°C.
`’
`
`stilbene dye. A dye whose molecules contain both the
`—N=N—— and the >C=.C< chromophore groups
`in their structure and whose CI numbers range from
`40000 to 40999. These are direct cotton dyes.
`stilbestrol. See diethylstilbestrol.
`
`stillage. The grain residue from alcohol production,
`used in feeds and feed supplements.
`Stock system. See chemical nomenclature.
`
`Stoddard solvent. A widely used dry-cleaning solvent.
`US. Bureau of Standards and ASTM D—484—52
`define it as a petroleum distillate clear and free
`from suspended matter and undissolved water, and
`free from rancid and objectionable odor. The mini-
`mum flash point is 100°F. Distillation range: not
`less than 50% over at 350°F (177°C), 90% over at
`375°F (190°C), and the end point not higher than
`4:,(1)°F (210°C). Autoignition temp. 450°F. Combus—
`tr
`e.
`"
`Containers: 55—gal steel drums; tank cars; tank trucks.
`Hazard: Moderate fire risk. Moderately toxic by in-
`gestion. Tolerance, 200 ppm in air.
`“Stod-Sol.”2°° Trademark for a petroleum solvent
`prepared by straight-run distillation.
`Properties: Water~white;
`initial boiling point 308—
`3]6°F, 95% distills between 363-373°F; sp. gr. 0.780
`(60°F); flash point (TCC) 103°F; mild, nonresidual
`odor. Combustible.
`Hazard: Moderate fire risk.
`Use: Dry cleaning.
`
`stoichiometry. The branch of chemistry and chemical
`engineering that deals with the quantities of sub-
`stances that enter into and are
`roduced by chemi-
`cal
`reactions. For example, wren methane unites
`with oxygen in complete combustion, 16 grams of
`methane require 64 grams of oxygen. At the same
`time 44 grams of carbon dioxide and 36 grams of
`water are, formed as reaction products. Every chem—
`ical
`reaction has .its characteristic proportions.
`The methods of obtaining these from chemical formu—
`las, equations, atomic weights and molecular weights,
`and determination of what and how much is used
`and produced in chemical processes is
`the major
`concern of stoichiometry.
`
`(1) The rate at which a spherical particle
`Stokes’ law.
`will rise or fall when suspended in a liquid medium
`varies as the square of its radius; the density of the
`particle and the density and viscosity of the liquid
`are essential factors. Stokes' law is used indetermin-
`ing sedimentation of solids, creaming rate of fat
`particles in milk, etc. The equation is:
`
`h
`v=——<=
`
`8D2(P: T Pl)
`
`I
`
`181;
`
`where v is the terminal velocity, It the height of fall,
`I the time, g the gravitational constant, 1), the parti-
`cle diameter, p,, p are the densities of the solid and
`
`Page 5 of 5
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`FORD 1223
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