Pyrolysis of mixtures

The autocatalytic effect of lead on the rate of reactions (3) and (4) was demonstrated146 by comparing the pyrolysis of mixtures of tetramethyl lead and hexaethyldiplumbane and of hexaethyldiplumbane and diethyl lead in the presence and absence of lead formed by reaction (4). 

In predicting yields, an empirical mechanism has to be resorted to since the chemistry of the pyrolysis of mixtures of C3 and C4 hydrocarbons is still at least partly conjecture. 

On the basis of this observation, the pyrolysis of mixtures of cellulose (1) and various vegetable oils under a variety of conditions was studied, and we have developed a convenient method for converting cellulose (1) to levoglucosenone (2) in >10% yield.6 The previously reported7 yields of levoglucosenone (2) produced by the pyrolysis of cellulose (1) under acidic conditions are usually 2-5% and utilize special vessels and procedures that are more involved than ours. Our procedure is essentially a vacuum distillation. 

The earliest work on the copolymerization of p-xylylene type monomers was reported in the brilliant pioneering studies of M. Szwarc (17). He and Roper (5) studied the pyrolysis of mixtures of p-xylylene and pseudocumene and concluded that mixtures of p-xylylene and 2-methyl-p-xylylene were formed which copolymerized on condensation. Apparently no extensive work on copolymerization or the nature of the products was conducted. 

Other groups (I, 15) have also conducted studies on the copolymerization of substituted p-xylylenes by pyrolysis of mixtures of substituted p-xylenes. Problems associated with the stability of many substituent groups at the elevated pyrolysis temperatures (= 900°C.) required to convert p-xylenes to p-xylylenes have, however, prevented a general study of copolymerization. 

FIGURE 1. Pyrolysis apparatus employed for the synthesis of carbon nanotubes by pyrolysis of mixtures of (a) metallocene + CaHa, (b) Fe(C0)s + C2H2, and (c) metallocene + benzene or thiophene. The numbers 1 and 2 indicated in the figure represents inlet and outlet, respectively.6... 

The pyrolysis of mixtures of single plastics and real-world plastic derived from municipal solid waste has been investigated by several researchers and the yield of gas, oiFwax... 

Pyrolysis techniques that involve the elimination of hydrogen or alkanes provide facile routes to boron- or aluminum-containing small-ring systems. For example, borazines are synthesized by the pyrolysis of mixtures of boranes and amines ... 

Pyrolysis of mixtures of aromatics in the gas phase - Carbon black production... 

Fraga, A. Ruseckaite, R.A. Jimenez, A. Thermal degradation and pyrolysis of mixtures based on poly(3-hydroxybu-tyrate-8%-3-hydroxyvalerate) and cellulose derivatives. Polym. Test. 2005,24, 526-534. 

In a study of the pyrolysis of Pb(C2H5)4 at temperatures up to 455 °C in a field ion mass spectrometer at 2 x 10"" Torr, the composition of the gaseous products was determined immediately at the end of the pyrolysis tube. Ethene was the major product at all temperatures. It was concluded that under the conditions of the experiment, ethene is produced mainly by monomolecular decomposition of C2H5, and ethane by a bimolecular reaction of C2H 5 and Pb(C2H5)4 [76]. Concentrations of methyl and ethyl radicals have been determined during pyrolysis of mixtures of Pb(CH3)4 and Pb(C2H5)4 at temperatures up to 500 °C with a field ion mass spectrometer. The concentration of the pyrolysis products, C2H6,... 

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