Showing papers on "Chemical decomposition published in 1973"

Stabilization of solutions of 3-isothiazolones employing certain metal nitrates and nitrites

Abstract: Solution of 3-isothiazolones are stabilized against chemical decomposition of the isothiazolone by adding thereto a metal nitrate or a metal nitrite.

Thermal Decomposition Reactions of Metal Oxalato Complexes in the Solid State. II. Evolved Gas Analyses of Metal Oxalato Complexes

Abstract: The thermal decomposition reactions of a number of metal oxalato complexes in the solid state were studied by an EGA method in a helium atmosphere. As regards the decomposition stage of an anhydrous complex, the complexes investigated could be divided into three groups: the complexes of Mn(III), Fe(III), Co(III), Rh(III), Cu(II), Pd(II), and Pt(II), this first group giving only CO2 as a gaseous product, decomposed by electron transfer from an oxalato ligand to a central metal ion; the complexes of Al(III) and Zn(II), this second group giving CO and CO2 in the molar ratio of 1:1, decomposed by C–O bond breaking to form a metal oxide with no change in the oxidation number of a central metal; and the complexes of V(III) and Cr(III), this third group giving CO2and a smaller amount of CO, decomposed through both the processes, electron transfer and C–O bond breaking. The subsequent decomposition reactions of the bivalent metal oxalato complexes formed upon heating the corresponding trivalent metal oxalato comp...

Low power sealed optically thin resonance lamp

Abstract: A resonance lamp having a controllable chemical decomposition source of a parent species and a chemical getter sink in a sealed RF excited discharge. The discharge occurs in a second, extremely pure gas which is present in great excess over the gas produced by chemical decomposition. Excitation of species whose emission is desired occurs by electron impact or energy transfer from the major species which are, in turn, excited by the electron impact.

Process for making an o,o-di(c1-c8 alkyl)thiophosphoryl chloride

Abstract: DISCLOSED IS A PROCESS FOR MAKING FROM AN O,O-DI(C1-C8 ALKYL) DITHIOPHOSPHORIC ACID AND CHLORINE A REACTION PRODUCT COMPRISING THE CORRESPONDING DI(C1-C8 ALKYL) THIOPHOSPHORYL CHLORIDE, WHICH PRODUCT IS SUBSTANTIALLY FREE OF SULFUR MONOCHLORIDE, O-(C1-C8 ALKYL) PHOSPHORYL DICHLORIDE AND BIS(O,O-DI(C1-C8 ALKYL) THIOPHOSPHORYL) DISULFIDE, IN THIS PROCESS THE ACID, PREFERABLY DISSOLVED IN INERT ANHYDROUS SOLVENT, IS REACTED IN A TEMPERATURE RANGE FROM ABOUT -10 TO ABOUT 10*C. WITH ABOUT ONE MOLAR EQUIVLANET OF CHLORINE, WHEREBY A REACTION MIXTURE CONTAINING SULFUR MONOCHLORIDE IS FORMED. THE REACTION MIXTURE IS ESTABLISHED AND MAINTAINED IN A TEMPERATURE RANGE FROM ABOUT 85 TO ABOUT 110*C. UNTIL IT IS SUBSTANTIALLY FREE OF SULFUR MONOCHLORIDE, AND IN PREFERRED EMBODIMENTS UNTIL THE RELATIVELY THERMALLY UNSATABLE SULFUR THAT FORMS BECOMES MORE THEREMALLY STABLE. THE RESULTING REACTION MIXTURE CONSISTS ESSENTIALLY OF O,O-DI(C1-C8 ALKYL) THIOPHOSPHORYL CHLORIDE AND SULFUR. IN PREFERRED EMBODIMENTS. THE DESIRED CHLORIDE CAN BE DISTILLED FROM THE REACTION MIXTURE WITH THE RISK OF AN UNCONTROLLABLE EXOTHERMIC DECOMPOSITION REACTION BEING AT A MINIMUM.

Poly‐α‐ester degradation studies. II. Thermal degradation of poly(isopropylidene carboxylate)

Abstract: The thermal degradation of poly(3-pentylidene carboxylate) has been studied kinetically over the temperature range 200–300°C using thermogravimetry, gas evolution analysis, and rheogoniometry together with isolation and analysis of the reaction products. The observed behavior is completely different from that previously reported for poly(isopropylidene carboxylate) and poly(methylene carboxylate). Whereas in the latter cases the decomposition occurs by a first-order intramolecular ester interchange process characterized by an activation energy in the region of 27 kcal mole−1, poly(3-pentylidene carboxylate) decomposition occurs by random chain scission superimposed on a first-order hydrogen abstraction process. The activation energy associated with this decomposition reaction is in the region of 47 kcal mole−1, and the major degradation products are cis- and trans-2-ethyl crotonic acid.

Method of stabilizing dichlorocyanuric acid salts

Abstract: Dry alkali metal salts of dichlorocyanuric acid stabilized with cyanuric acid or its sodium salt against self-sustaining, thermally-initiated decomposition are protected against self-initiated chemical decomposition by mixing the stabilized dichlorocyanuric salts with an inorganic salt which gives in aqueous solution a pH of at least 9. The essential components of the composition are (1) from about 10-70 percent of an alkali metal dichlorocyanurate; (2) from about 25-75 percent of cyanuric acid or the alkali metal salt thereof; and (3) from about 5-50 percent of an inorganic salt the pH of which is at least 9 in aqueous media. The aforesaid percentages are by weight and are based on the total composition.

Decomposition of hydrogen sulfide in on electric discharge

Abstract: Hydrogen sulfide was decomposed to elemental sulfur in an electrical discharge. With He, N/sub 2/, or Ar diluents, a threshold voltage between 1 and 3 kV was required for the decomposition reaction to occur in a laboratory ozonizer. Above the threshold voltage, the H/sub 2/S decomposition rate increased with increasing voltage, but the increase was more pronounced with argon diluent than with either nitrogen or helium. In common with other reactions in an electrical discharge, the H/sub 2/S decomposition decreased with increasing temperature in the range of -41/sup 0/ to +61/sup 0/C. The reaction did not appear to be rate controlled by a solid-gas sorption step because the introduction of activated charcoal into the electrical discharge zone did not significantly affect the decomposition yield. In the presence of polymeric chlorofluorocarbon oil, 90 percent conversion of the 3-percent H/sub 2/S in helium was obtained at 14 kV, 60 Hz, a 2-mm electrode gap, and a gas-residence time greater than 1 min. Under the same experimental conditions in the absence of oil, the conversion was only about 50 percent.

Photochemistry of Nitramines IV observed intermediates and products in the photo-chemical decomposition of 1-Nitropyrrolidine

Abstract: 1-Nitropyrrolidine upon irradiation with ultraviolet light is known to under-go photochemical decomposition This investigation is concerned with the mechanism and products of the reaction A potential intermediate was synthesized and found not detectable in the photochemical system A product of the photolysis in alkane solutions was identified as an alkyl nitrate Gas chromatographic analysis and a molecular orbital calculation provided information to suggest processes which might