Design of a fast flow reactor for aerobic treatment of dilute waste streams

Abstract The reactions of hydrogen atoms with silane and the methylated silanes - with the exception of tetramethylsilane -have been investigated in a fast flow reactor. Under our experimental conditions hydrogen abstraction from the Si-H bond is followed by combination of hydrogen atoms with the corresponding silyl radicals. The molecules formed in this way are activated by about 375 kJ/mol of vibrational energy. Two decomposition channels have been unequivocally identified, namely the elimination of molecular hydrogen and of methane, both with concomittant formation of the respective silylenes. In a subsequent step, silylene inserts into the substrate under formation of disilanes. With increasing degree of methylation. stabilization of the activated molecule competes with decomposition and dominates the kinetics in the case of trimethylsilane. With methyl -and dimethyl-silane, methyl radicals are observed as an additional reaction product. On the basis of RRKM calculations it is unlikely that they originate from a direct decomposition of the activated molecules.Absolute values for the room temperature rate constants of the abstraction reactions are given; for H+CH3SiH3, Arrhenius parameters have been determined.

Download Full-text

A fast flow reactor sampled by a TOF mass spectrometer with a molecular beam inlet system

International Journal of Mass Spectrometry and Ion Physics ◽

10.1016/0020-7381(75)85014-5 ◽

1975 ◽

Vol 16 (1-2) ◽

pp. 53-67 ◽

Cited By ~ 6

Author(s):

G. Ronald Brown ◽

Richard Pertel

Keyword(s):

Mass Spectrometer ◽

Molecular Beam ◽

Flow Reactor ◽

Inlet System ◽

Fast Flow ◽

Fast Flow Reactor

Download Full-text

Free radicals by mass spectrometry. XL. Primary processes and transient intermediates in the mercury (3P1) photosensitization of hydrazine

Canadian Journal of Chemistry ◽

10.1139/v69-227 ◽

1969 ◽

Vol 47 (8) ◽

pp. 1391-1393 ◽

Cited By ~ 4

Author(s):

A. Jones ◽

F. P. Lossing

Keyword(s):

Mass Spectrometry ◽

Free Radicals ◽

Mass Spectrometer ◽

Direct Evidence ◽

Flow Reactor ◽

Low Pressure ◽

Primary Decomposition ◽

Fast Flow ◽

Transient Intermediates ◽

Fast Flow Reactor

The low pressure mercury (3P1) photosensitized decomposition of hydrazine has been studied at 55 °C in a fast flow reactor coupled to a mass spectrometer. Direct evidence was obtained for the participation of N2H2, N2H3, NH2, and NH in the decomposition, and two primary decomposition modes were established[Formula: see text]

Download Full-text

Reaction Kinetics of Ground State Fluorine, F(2P), Atoms. I. Measurement of Fluorine Atom Concentrations and the Rates of Reactions F + CHF3 and F + Cl2 using Mass Spectrometry

Canadian Journal of Chemistry ◽

10.1139/v73-535 ◽

1973 ◽

Vol 51 (21) ◽

pp. 3596-3604 ◽

Cited By ~ 49

Author(s):

Michael A. A. Clyne ◽

Donald J. McKenney ◽

Ronald. F. Walker

Keyword(s):

Mass Spectrometry ◽

Reaction Kinetics ◽

Ground State ◽

Fluorine Atom ◽

Flow Reactor ◽

Bimolecular Reaction ◽

Inlet System ◽

Fast Flow ◽

Kinetics Of ◽

Fast Flow Reactor

Reactions of F(2P) atoms generated by a 2.45 GHz discharge in dilute F2 + He mixtures have been studied mass spectrometrically with a beam inlet system from a fast flow reactor. F atom concentrations have been measured from the consumption of Cl2 in the simple and extremely rapid bimolecular reaction 1[Formula: see text]k1 was determined to be (1.1 ± 0.3) × 10−10 cm3 molecule−1 s−1 at 300 °K.Rate measurements for the reaction 2, which forms CF3 radicals, are reported, over the range 301 to 667 °K,[Formula: see text][Formula: see text]A less detailed survey of the rates at 298 °K of a series of reactions of F with H2, CH4, CH3Cl, CH2Cl2, and CHCl3, is also given; in these cases, the source of F was a discharge in CF4 + Ar, and [F] was measured by titration with ClNO.

Download Full-text