Volatile Products Formed in the Thermal Decomposition of a Tobacco Substrate

2013 ◽  
Vol 52 (42) ◽  
pp. 14984-14997 ◽  
Author(s):  
Federica Barontini ◽  
Alessandro Tugnoli ◽  
Valerio Cozzani ◽  
John Tetteh ◽  
Marine Jarriault ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Volatile Products

Thermal Reaction of Silane with Acetylene and The Thermal Decomposition of Ethynylsilane

1984 ◽  
Vol 32 ◽  
Author(s):  
M. A. Ring ◽  
H. E. O'Neal ◽  
J. W. Erwin ◽  
D. S. Rogers
Keyword(s):  
Thermal Decomposition ◽  
Product Yield ◽  
Thermal Reaction ◽  
Yield Curves ◽  
Silyl Radicals ◽  
Volatile Products ◽  
Rule Out

The volatile products from the thermal reaction (414°C) of silane in excess acetylene are hydrogen, ethylene, vinylsilane, ethynylsilane, vinylethynylsilane (possibly divinylsilane) and ethynyl-divinylsilane (1,2). We have reexamined this reaction using a 3 C2 H2/1 SiH4 reaction mixture and have obtained product yield curves for these products versus percent silane loss. We have also found that product curves are unaffected when propylene at pressures equal to that of acetylene is also present. Since only trace quantities of propylsilane are produced in the presence of propylene, we can rule out reactions involving silyl radicals. Thus the SiH4−C2H2 reaction involves silylene and silene intermediates. The products can be explained by a mechanism similar to one proposed by Barton and Burns (3).

THE THERMAL DECOMPOSITION OF CARBOHYDRATES

1948 ◽  
Vol 26b (4) ◽  
pp. 415-431 ◽  
Author(s):  
I. E. Puddington
Keyword(s):  
Carbon Dioxide ◽  
Thermal Decomposition ◽  
Carbon Monoxide ◽  
Reaction Temperature ◽  
Potato Starch ◽  
Second Step ◽  
Volatile Solids ◽  
Volatile Products ◽  
Separate Step ◽  
Rapid Reaction

The thermal decompositions of cellobiose, maltose, dextrose, and potato starch have been studied over a temperature range, by following the production of volatile products. Carbon dioxide, carbon monoxide, and water with small quantities of acids, aldehydes, and volatile solids were produced in all cases. With cellobiose, the first step of the reaction, which involved the elimination of two moles of water per mole of sugar, could be separated from the second step, where the oxides of carbon were produced, by controlling the reaction temperature. Dextrose first dimerized by a rapid reaction and then decomposed in much the same manner as cellobiose. The behavior of maltose was anomalous and no dehydration by a separate step could be detected. The decomposition of potato starch was similar to the second step of the cellobiose reaction.

scholarly journals Synthesis, Spectroscopic, and Thermal Investigations of Metal Complexes with Mefenamic Acid

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Karolina Kafarska ◽  
Michał Gacki ◽  
Wojciech M. Wolf
Keyword(s):  
Thermal Decomposition ◽  
Metal Complexes ◽  
Isothermal Condition ◽  
Molar Conductance ◽  
The Novel ◽  
Absorption Bands ◽  
Gaseous Products ◽  
Thermal Investigations ◽  
Volatile Products ◽  
Bidentate Chelate

The novel metal complexes with empirical formulae M(mef)2·nH2O (where M = Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II); mef is the mefenamic ligand) were synthesized and characterized by elemental analysis, molar conductance, FTIR-spectroscopy, and thermal decomposition techniques. All IR spectra revealed absorption bands related to the asymmetric (νas) and symmetric (νs) vibrations of carboxylate group. The Nakamoto criteria clearly indicate that this group is bonded in a bidentate chelate mode. The thermal behavior of complexes was studied by TGA methods under non-isothermal condition in air. Upon heating, all compounds decompose progressively to metal oxides, which are the final products of pyrolysis. Cu(II), Zn(II), and Cd(II) complexes were also characterized by the coupled TG-FTIR technique, which finally proved the path and gaseous products of thermal decomposition. Additionally, the coupled TG-MS system was used to determine the principal volatile products of thermolysis and fragmentation processes of Mn(mef)2·3H2O and Co(mef)2·2H2O.

Thermal decomposition of lanthanide complexes with sulfoxid ligand and study of volatile products liberated

2005 ◽  
Vol 79 (2) ◽  
pp. 305-308 ◽  
Author(s):  
P. Miranda Jr. ◽  
L. P. Mercuri ◽  
J. R. Matos ◽  
M. F. Máduar ◽  
J. Zukerman-Schpector
Keyword(s):  
Thermal Decomposition ◽  
Lanthanide Complexes ◽  
Volatile Products

Thermal Decomposition of Polypyrrolidone in the Solid State

1976 ◽  
Vol 46 (10) ◽  
pp. 776-778 ◽  
Author(s):  
S. K. Kakar
Keyword(s):  
Thermal Decomposition ◽  
Solid State ◽  
Kinetic Parameters ◽  
Thermal Energy ◽  
Major Product ◽  
Infrared Analysis ◽  
Volatile Products

Polypyrrolidone was thermally degraded in the solid state at 180, 200, 210, and 220°C. Kinetic parameters for overall degradation were determined. Analysis of volatile products showed that 2-pyrrolidone was the major product of decomposition. Infrared analysis of nonvolatile products showed that bands in the region of 900–1130 cm-1 were sensitive to thermal energy. Various possible reactions that lead to the formation of 2-pyrrolidone are discussed briefly.

scholarly journals Experimental study on light volatile products from thermal decomposition of lignin monomer model compounds: effect of temperature, residence time and methoxyl group

RSC Advances ◽  
2021 ◽  
Vol 11 (59) ◽  
pp. 37067-37082
Author(s):  
Huamei Yang ◽  
Ju Jiang ◽  
Bingzhe Zhang ◽  
Panpan Xu
Keyword(s):  
Experimental Study ◽  
Thermal Decomposition ◽  
Residence Time ◽  
Methoxyl Group ◽  
Effect Of Temperature ◽  
Model Compounds ◽  
Volatile Products ◽  
Effects Of Temperature ◽  
Elimination Reactions

Effects of temperature, residence time and methoxyl on the decomposition of phenol, guaiacol and syringol, were investigated. Thermal decomposition pathways of the three model compounds were discussed based on ring reduction/CO elimination reactions.

scholarly journals Thermal decomposition of the amino acids glycine, cysteine, aspartic acid, asparagine, glutamic acid, glutamine, arginine and histidine

2017 ◽  
Author(s):  
Ingrid M. Weiss ◽  
Christina Muth ◽  
Robert Drumm ◽  
Helmut O.K. Kirchner
Keyword(s):  
Mass Spectrometry ◽  
Amino Acids ◽  
Thermal Decomposition ◽  
Glutamic Acid ◽  
Aspartic Acid ◽  
Peptide Bonds ◽  
Integer Coefficients ◽  
Half Integer ◽  
Volatile Products

AbstractCalorimetry, thermogravimetry and mass spectrometry were used to follow the thermal decomposition of the eight amino acids G, C, D, N, E, Q, R and H between 185°C and 280°C. Endothermic heats of decomposition between 72 and 151 kJ/mol are needed to form 12 to 70 % volatile products. This process is neither melting nor sublimation. With exception of cysteine they emit mainly H2O, some NH3 and no CO2. Cysteine produces CO2 and little else. The reactions are described by polynomials, AA ^ a (NH3) + b (H2O) + c (CO2) + d (H2S) + e (residue), with integer or half integer coefficients. The solid monomolecular residues are rich in peptide bonds.

Sign in / Sign up

Export Citation Format

Share Document