Rapid Determination of Small Amounts of Carbon Monoxide

The heats of combust ion of five h ighl y purified long-chai n liquid h.vdrocil.rbon~ "'ere meas ured ",ith a bomb ca lorimeter . The calor imetric data y ield t he folloll'ing \'a lues for the h eat~ of combu s tiOIl , -t1 f1 cO(25° e), of the li quid hydrocarbon wilh gaseo us Ox.'·gE' 1l t o form gaseous car bon dioxide and liqu id water ; .l k ii ocalorie = 4.1840 kilo jo ul e. It i~ sholl' n th a, t , in th e liquid as \\'('11 as in the gascous s tat e, t he inc rc mc nt in the h(' a t of co mbu s ti o n (a nd hence in the heat of for matio n) prr (' H , group added in the li-alk.\·1 sid e chain is a co ns ta.nt excepL fo r the fi rst (\\'0 l1l e mben' of the . 'ie r ie s, and th a t (his incre me nt ha~ lh(' same value for eac h o f (hese s('r ies of com p ounds.

Section: Methods and Appar Atusmentioning

confidence: 99%

Heats of combustion of liquid n-hexadecane, 1-hexadecene, n-decylbenzene, n-decylcyclohexane, n-decylcyclopentane, and the variation of heat of combustion with chain length

Fraser¹,

Prosen²

1955

“…Samplcs of th e products of combustion were analyzed for carbon m onoxid e, tIl e most likely produ ct of incomplete combustion , b y the Gas Chemistry Scction of thi s B ur eau [8] . In no casc was th c total amount of carbon monoxide greater th an 0.004 per· ccn t of the amoun t of carbon dioxid e form ed in th e combustion h en ce no corrections were appl ied for this small a: mount of carbon monoxide.…”

Section: Purity Of the Reaction Of Combustionmentioning

confidence: 99%

Heats of combustion, formation, and insomerization of ten C4 hydrocarbons

Prosen¹,

Maron²,

Rossini³

1951

The heats of co mbustion of ten C4 hydrocarbons were meas ured b y combustion of t he gaseous hydrocarbon in a flame at constant pressure in a glass reaction vessel in a calorimeter. The calorimeter system was calibrated by means of electrical e ne rgy.The exp erimental data yielded the following values for the standard heat of combustion, -t:J.Hco , at 25° C and co nstant press ure, of the gaseous hydrocarbon in gaseous oxygen to form gaseo us carbon dioxide and liquid wate r, with all t he reactants and products in their thermodynamic standard reference states, in k cal/mole : n-butane, 687 .42 ± O.15 ; 2-methylpropane, 68S.37 ± O.11 ; I-butene, 649.33 ± O.18 ; cis-2-bute ne, 647.6S ± O.29 ; trans-2-butene, 646.90 ± O.23 ; 2-methylprope ne, 645.19 ± O.2S ; 1,2-butadiene, 619.93 ± O.13 ; 1,3-butadiene, 607.16 ± O.18 ; I-butyne, 620.64 ± O.20 ; 2-buty ne, 61S.84 ± O.23 .Values of hea ts of isomerization, formation, and hydrogenation were derived from these dat a .

“…The NBS colorimetric indicator for carbon monoxide and the "Laboratory Method" describ ed by Shepherd [2] were used in the analyses for carbon monoxide reported in this paper . A detailed description of the analytical procedure as adapted to this problem is given in section V.…”

Section: Methods For Determination Of Carbon Monoxidementioning

confidence: 99%

A quantitative study of the carbon monoxide formed during the absorption of oxygen by alkaline pyrogallol

Kilday¹

1950

The amounts of carbon monoxide evolved durin g analytical absorptions of oxygen by alkaline py rogallol were stud ied wi th r e p ect to the composition and methods of preparing solutions, t h e temperature of r eaction , the rate of fl ow of t he sample thr ough the solution, t he capacity of t he reage nt for t he absorp tion of oxygen , the partial pressure of reacting oxyge n, and the manner of b ringing th e gas into contact wi th the reagent. Less t han 0.02 percent of car bon monoxid e was formed durin g analyses of gases containing as much as 80 percent of oxyge n when t he recommen ded solutions were used in bubbler-type absorpt ion pipettes, a nd when the samples were passed into t he solu tio ns at a rate greater t han 20 millili te rs pCI' minu te at a bout 25° C. This was t ru c until thc solu t ions had absorbed approximately twelve times th eir volume of oxygen, after which t he formation of carbon monox ide increased signifi cantly. The N BS colorimetri c carbon monoxide indicating gel was used for the quantitative determinations of carb on m onoxide. A method ,yas developed for preparing pyrogallol solu t ions t hat y ield ed rep roducible amounts of car bo n m onoxide so s mall that no sig nifi cant error was caused in t he usual analysis.