Process for preparing aromatic amine compounds and reducing agen

Details Process for preparing aromatic amine compounds and reducing agen Process for preparing aromatic amine compounds and reducing agen

1991-05-28

1993-11-30

Niebling, John

Chemistry: electrical and wave energy

Processes and products

204 59R, C25B 304

Patent

active

052661733

ABSTRACT:
An improved process for reducing aromatic nitro compounds to form the corresponding aromatic amine compounds, and intermediates therefore, and a reducing agent therefor, are disclosed. According to the process, a titanium(IV)oxy salt such as titanium(IV) oxysulfate is electrochemically reduced to form a titanium(III)oxy reducing agent, which can be employed to chemically reduce the aromatic nitro compounds, and the resulting re-oxidized titanium salts may be recycled to the electrochemical reduction step of the process. The titanium(III)oxy salt product is highly soluble in strong acid solutions and exhibits improved oxidation stability.

REFERENCES:
patent: 4173521 (1979-11-01), Wade
patent: 4422917 (1983-12-01), Hayfield
patent: 4971666 (1990-11-01), Weinberg et al.
Noel et al, "A Two-Stage Electrosynthesis of 4,4'-Diamino-Stilbene-2,2'-Disulphonic Acid", Indian Journal of Technology, vol. 19, Mar. 1981, pp. 100-101.
Noel et al, "An Electrochemical Technique for the Reduction of Aromatic Nitro Compounds," 12 (1982), 291-298.
Miyanaga et al., "Structures of Hydrated Titanium and Vanadium Ions in Aqueous Solutions Studied by X-Ray Absorption Spectroscopy", Bull. Chem. Soc. Jpn., 63, 3282-3287 (1990).
Hayfield et al., "The Electrochemical Characteristics and Uses of Magneli Phase Titanium Oxide Ceramic Electrodes," presented at Electrochemical Society meeting, May 7-12, 1989.
Comba et al., Inorg. Chem., 1987, 26, 1315-1323.
Cotton et al., Advanced Inorganic Chemistry, Fifth Ed., John Wiley & Sons, pp. 654-665 (1988).
Chaussard et al., J. Applied Electrochemistry 16, 803-811 (1986) (with translation).
Gratzel et al., "Raman Spectroscopic Evidence for the Existence of TiO.sup.2+ in Acidic Aqueous Solutions", Inorg. Chem., 1985, 24, 2320-2321.
Noel, et al., J. Applied Electrochemistry 12 (1982) 291-298.
Abstract, EP 64,629 (1982).
Narasimham et al., "Electrolytic Preparation of Titanous Sulphate", Trans. SAEST vol. 15, No. 2 (1980) 147-162.
Jacobson, Encyclopedia of Chemical Reactions, ed. by C. Hampel, vol. VII, Reinhold Pub. Corp. (New York) 1958, 414-415, 420-423.
Lundgren, Rec. Trav. Chim. 75, 585-8 (1956).
Inouye, Chemical Abstracts, 1955, 18, 4950.
Newton, et al., "The Kinetics of the Reduction by Titanous Chloride of Nitrobenzene and its Substitution Products", J. Chem. Soc., 3384-3391 (1953).
Thon, Chemical Abstracts, 1950, 6, 1354.
Swaminathan et al., "Preliminary studies on the electrolyutic reduction of nitrobenzene to aniline", J. Appl. Electrochem. 2 (1972) 169-173.
American Chemical Society, Registry Nos. 12334-00-9, 13825-74-6 (1990); 64514-49-4, 13693-11-3, 58428-64-1 (1991).
Kirk-Othmer Encyclopedia of Chemical Technology, vol. 23, 168-169.
Aldrich Catalog, 1992, p. 1199.
Merck Index, 11th Ed. (1989) pp. 1492-1493.

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