7664-93-9Relevant articles and documents
Hoenig, M.
, (1885)
Hughes, Martin N.,Lusty, James R.
, (1977)
Luckow, C.
, p. 53 - 57 (1893)
Cornog, J.,Henderson, W. E.
, p. 1978 - 1980 (1924)
Highly efficient photoinitiation in the cerium(III)-catalyzed aqueous autoxidation of sulfur(IV). An example of comprehensive evaluation of photoinduced chain reactions
Kerezsi, Ildiko,Lente, Gabor,Fabian, Istvan
, p. 4785 - 4793 (2005)
The photoinitiated and cerium(III)-catalyzed aqueous reaction between sulfite ion and oxygen has been studied in a diode-array spectrophotometer using the same light beam for excitation and detection. Cerium(III) is identified as the photoactive absorbing species, and the production of cerium(IV) initiates a radical chain reaction. To interpret all the experimental findings, a simple scheme is proposed, in which the additional chain carriers are sulfite ion radical (SO3-.), sulfate ion radical (SO4 -.), and peroxomonosulfate ion radical (SO5-.). The overall rate of oxidation is proportional to the square root of the light intensity per unit volume, which is readily interpreted by the second-order termination reaction of the proposed scheme. It is also shown that the reaction proceeds for an extended period of time in the dark following illumination, and a quantitative analysis is presented for this phase as well. The postulated model predicts that cerium(III) should have a cocatalytic or synergistic effect on the autoxidation of sulfite ion in the presence of other catalysts. This prediction was confirmed in the iron(III)-sulfite ion-oxygen system. The experimental method and the mathematical treatment used might be applicable to a wide range of photoinduced chain reactions.
On synthesis, structure, and thermal stability of mercury and lead sulfates and oxide sulfates
Ahmed,Fjellv?g,Kjekshus
, p. 113 - 121 (2002)
Reactions between HgO, PbO, or PbO2 and 2.5-95 wt.% H2SO4 are studied at temperatures up to the boiling point of the acid. Depending on the oxide reactant, the H2SO4 concentration, and synthesis tempe
Lichty, D. M.
, p. 1834 - 1846 (1908)
Marchlewski, L.
, p. 403 - 411 (1893)
Toennies, G.
, p. 552 - 555 (1937)
Watt, G. W.,Achorn, S. L.,Marley, J. L.
, p. 3341 - 3343 (1950)
Kinetics and Mechanism of the Oxidation of Aquated Sulfur Dioxide by Hydrogen Peroxide at Low pH
McArdie, James V.,Hoffmann, Michael R.
, p. 5425 - 5429 (1983)
A stopped-flow kinetic study of the oxidation of sulfur dioxide by hydrogen peroxide was performed over the pH range 0.0-4.5.A rate expression of the following form was verified experimentally: d/dt = k1Ka1(k2+> + k3)/-1 + k2+> + k3)(Ka1 + +>)>.The following kinetic parameters at 15 deg C were determined: k1 = (2.6 +/- 0.5)*106 M-1 s-1, k2/k-1 = 16 +/- 4 M-1, k2/k3 = (5 +/- 1)*102 (HA = acetic acid), ΔH(excit.)1 = 37 +/- 2 kJ mol-1, and ΔS(excit.)1 = 4 +/- 4 J K-1 mol-1.The reaction proceeds via a nucleophilic displacement of HSO3-1 by H2O2 to which undergoes sulfurous acid intermediate which undergoes acid-catalyzed rearrangement to form product: SO2*H2O HSO3- + H+(Ka1), H2O2 + HSO3- HOOSO2- (k1, k-1), HOOSO2- + H+ -> H+ + HSO4- (k2), HOOSO2- + HA -> HA + HSO4- (k3).Application of the above rate expression to reactions occuring in hydrometeors is discussed.
Hattox, E. M.,De Vries, T.
, p. 2126 (1936)
Fajans, K.
, p. 357 - 375 (1927)
Selected-control hydrothermal synthesis of γ-MnO2 3D nanostructures
Wu, Changzheng,Xie, Yi,Wang, Dong,Yang, Jun,Li, Tanwei
, p. 13583 - 13587 (2003)
Highly uniform γ-MnO2 3D urchinlike and sisallike nanostructures have been successfully prepared by a common hydrothermal method based on the reaction between MnSO4 and KBrO3. Reaction temperature and the additives of the polymers play an important role in influencing the morphologies of the as-obtained products. These urchinlike and sisallike nanostructures, which own the highly specific area on the surface of the particles may provide more possibility to give an ideal host material for the insertion and extraction of lithium ions, to realize region-dependent surface reactivity, and to act as molecular sieves.
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Jumakaeva, B. S.,Golodov, V. A.
, p. 303 - 308 (1986)
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Methods for producing a methanol precursor, methanol, and a methyl ester from methane in high purities
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Page/Page column 11; 12, (2021/06/02)
A method for producing a methanol precursor, methyl trifluoroacetate, having high-purity includes the steps of (a) preparing methyl bisulfate by mixing a catalyst with an acid solution comprising a sulfur-containing acid to provide a first mixture and supplying methane gas to the first mixture to prepare the methyl bisulfate; and (b) preparing methyl trifluoroacetate (CF3CO2CH3) by adding trifluoroacetic acid (CF3CO2H) to the first mixture including the methyl bisulfate to provide a second mixture and distilling the second mixture under heating to prepare, separate and purify the methyl trifluoroacetate (CF3CO2CH3). Methanol may be produced by adding water to the methyl trifluoroacetate (CF3CO2CH3). A methyl ester represented by Formula 2 below may be produced by adding a carboxylic acid represented by Formula 1 below to the methyl trifluoroacetate (CF3CO2CH3): R1CO2H??(1),where R1 is selected from C1-C10 alkyl groups, R1CO2CH3??(2),where R1 is as defined in Formula 1.
Para-ester synthesis process for recycling hydrogen chloride
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Paragraph 0086; 0092-0106; 0112-0126; 0132-0146; 0152-0166, (2020/05/01)
The invention discloses a para-ester synthesis process capable of recycling hydrogen chloride, which is characterized by comprising the following steps: (1) preparing chlorosulfonic acid; absorbing the hydrogen chloride gas generated in the chlorosulfonation link through an original HCl absorption tower, and resolving to generate pure hydrogen chloride gas; reacting the hydrogen chloride gas withpure sulfur trioxide gas in a primary reaction tower to obtain gaseous chlorosulfonic acid; condensing the gaseous chlorosulfonic acid and entering in a secondary reaction tower, and fully reacting aside reaction product in the primary reaction tower with excessive sulfur trioxide and hydrogen chloride to further generate chlorosulfonic acid; (2) preparing para-ester; preparing chlorosulfonated substances in a sulfonation reaction kettle; diluting and carrying out suction filtration, and then carrying out a reduction reaction, a condensation reaction and an esterification reaction to preparethe para-ester. The hydrogen chloride generated in the chlorosulfonation link is recovered and reacts with sulfur trioxide gas to prepare chlorosulfonic acid, the chlorosulfonic acid serves as a raw material in the chlorosulfonation link, the para-ester is further prepared, and cyclic utilization is achieved.