Document mVZ8VyRN37Rr5Q0rdk3J68eb

Xi *4 Sept. 4, 1934 : ?'* v . li A ' -v_- , ' -v.u^w v ' !T* . ^4*1 in; v*r; -V tt.rip, -V- i ~:t. lift' < L "`V `IS-.-..X; '4 ; 5'-r` *: z'rip '*-, ?' ^ ^-UNITED States patent 1,972,847 office . _.. r.. . %/.'< ;v .. .. .* r*t. b; v K. \ Si-. *i.; iTf /' ' -v ; *:<r. ; ij; . ' ' 'JKu ~M. I>erlne u4 Herbert I. Krue, Anniston, - Ala., assignors to Swmnn Research Incorporated, a corporation of AUK`M` - No Drawing. Application Deoembor If, IfIX, Serial No. k Claim. (OL *52--6) This invention relates to compositions of matter diphenyl oxide, 12 parts of naphthalene and 28 and particularly to certain mixtures of aromatic parts of tMr-hnirAl diphenyl, and charge to a boiler - hydrocarbons of high molecular weight and high or heat absorber which is to be used in connec boiling point, which may be used as high tempera- tion with a high temperature cracking still or ture heat transfer media. other devloe where high temperature heat is nec- < One object of this invention is the provision ess&ry. This mixture has the property of freezing Of a composition of matter, which will be useful as low as 6.7 C., which is the lowest freezing for high as well as low temperature heating ap point which we have been able to discover using plications. Another object is the provision of a mixtures of the three substances mentioned If high temperature heating composition which will, above. Such a mixture may be referred to as < when subjected to decomposing temperatures, having the eutectic composition. When heated reach an equilibrium composition and will not at a temperature of 825 F. this mixture further suffer additional further decomposition, at least has the property of decomposing for some 500 to so far as deposition of carbon is concerned. 600 hours as indicated by a lowered freezing point, ID The use of diphenyl or diphenyl oxide, either but after this period no further decomposition ' alone or in combination for high temperature occurs. We may, of course, use this composition beating applications, has, of course, long been at considerably high temperatures without en known. . countering a decomposition which will render These substances, however, on heating above the material Inoperative. DO the decomposition temperature apparently con While the composition set forth above will have 1 tinue to decompose without reaching a steady the lowest freezing point possible using these three * state. At all events the decomposition is pro- materials, in case a low freezing point is not gresslve and the equilibrium condition on decom essential, we may Increase the naphthalene con position corresponds apparently to the presence tent at the expense of either of the other two . . DC jrf only a very small amount of the original ma constituents and obtain a material somewhat 1 ' teriaL For this reason these materials are limit more stable thermally. For example, we may ed In their field of usefulness to temperatures In employ a mixture comprising 40 percent diphenyl, the neighborhood of 750* F. or below. 20 percent diphenyl oxide, and 40 percent naph We have now discovered that by the addition thalene and obtain therewith a freezing point of 'go of a fairly pure grade of naphthalene to diphenyl 26.8s C. Other mixtures embodying these three < Or diphenyl oxide and in particular to mixtures materials are also possible. of these two substances, we are enabled to use In order to obtain the most stable mixtures, it these materials at a much higher temperature. Is desirable that a fairly pure grade of naph When employing these materials or mixtures to thalene be employed. For this purpose a sub ; fgfrether with naphthalene, some decomposition, limed naphthalene melting above 79.5s C. Is 1 of course, takes place, but it quickly reaches a desirable. j steady state after which further decomposition While we have described one application of .. . Is not apparent. - high temperature beat using my composition -v`. By means of our invention, we may also produce other applications will, of course, occur to those U/r-** mixtures having a much lower freezing point skilled In the art. We may use this mixture in ' cv??.. than when using only diphenyl and diphenyl most process heating applications in the chem . f oxide incombination. For example by oombining ical and oil Industry where diphenyl or diphenyl diphenyl, diphenyl oxide.And naphthalene In the oxide has been used in the past. We may also *Afrvt'/ jwa-.hSlr ** V-*v - Proper proportions, we may reach a freezing point tow ns D.r C. Mlxtureshavlng low freezing points are of value since they enable the droQlat- Jug system t6 be more m*Dj started In oold weather without reseat tp auxiliary heating ap- gtienrev '*a;-yr'"riv- :!** * ..employ it as a high temperature fluid in power generation In place of water or In the Interstage reheating of steam. - ft may further be employed it an insulating And oooUng medium In electrical devices where it , 'has hitherto been proposed to use diphenyl oxide ; u ^ FfcjO,Ww dnctlbe aeftfij axiuu by which Mr alone or with other substances. In devices of this ' fcmmtloh any 1m utilized, lthou*h It ] to o. Character tt Is desirable that the material be; fluid At a low temperature and have a high boiling ____ .. ,, ilpolnt. It should also be stable against the high peat together Jtqdxture i soffyftuflcal temperptures of electrical descriptive <**--' '* ' '.''A;-- ' 3! -O TOWOLDMONOQ57406 TVl T ' 5' i ; such m oocur when used as an fwii^Hny nd t. A beat transfer and Insulating medium com- woollng medium In oil filled switches. prising a mixture of diphenyl, dlphenyl-owide and <' r Other applications will, of oourse, oocur to naphthalene, the naphthalene being present in ? > : -^ene Allied in the art. amount ranging from 12 percent to 40 percent %**''$ Saving now particularly described our Inven- of the combined weights of the diphenyl and di- . . lion, whatwe claim i*<--, - , - v, , phenyl pride in said medium, . ,r,. . , * 'w'M 11 * AifeteteatrttnAfifcr mdfliesn omnWrlA*1* 0. aransftrnwrilam^tffcbuhig of ' laisture of #0 parts of diphenyl oxide, 12 parts of a mixture of diphenyl, diphenyl-oxide and naph- - ^ itj v IfirMholTnt aril ?a "f d<rK***r1. **TM , the naphthalene amounting to from dure haring a fr--*g point in the neighborhood. MWfc to 40% by weight of said medium. * -' S R.7AC. * ` 5. A heat transfer TM>dinm comprising di ' < - : 8. A heat transfer medium, stable SBtfUtan* gfoenyl, diphenyl oxide and naphthalene in sub- *', * peratures, comprising a mixture.of approximately gtanUally eutectic proportions. 90 parts of diphenyl oxldt,. TTjaJIS nsph- :t : . MAX M. LEVINE. 'A'' \ gg having a freesing point' above t#JT C*' ` ^ ' HERBERT J. ERASE. v- . and 28 parts of diphenyl, said mixture having a ^ . ' ?- freesing point in the neightmfflwodidf Wire- , ' AO 86 80 a to . tr'" If. - r. 86 ti* 180 8#1- 106 tV M TOWOLDMONOQ57407