Concept

Alun

Publications associées (39)

Process for the preparation of 5-nitro-1,4-naphthoquinones

Title compds. I (R = H, C1-4 alkyl or alkoxy), useful as dye intermediates, are prepd. by oxidn. of nitronaphthalenes with Mn2(SO4)3. A melt contg. 173 parts 1-nitronaphthalene was treated over 30 min with 2200 parts of an aq. 36% Mn2(SO4)3-H2SO4 soln. whi ...

(Ciba-Geigy A.-G., Switz.).1987

The indirect electrolytic oxidation of aromatic derivatives

Christos Comninellis

A report from a symposium describing the electrochem. oxidn. of arom. hydrocarbons to benzoquinones with Mn2(SO4)3 in concd. H2SO4. A simple reactor for the electrochem. regeneration of Mn3+ from Mn2+ is also described. [on SciFinder (R)] ...

1987

The electrochemical reduction of anthraquinone to anthrone in concentrated sulfuric acid

Christos Comninellis

The chem. redn. of anthraquinone(I) has at least 2 disadvantages on the industrial scale; therefore, an electrochem. method was developed. The electrochem. redn. of I is done in a 2-compartment cell using concd. H2SO4 (15-17 mol/dm3) as the electrolyte at ...

1985

Aldehyde

Christos Comninellis

4-Me3CC6H4CHO was prepd. by oxidn. of 4-Me3CC6H4Me by a Mn3+ salt, esp. Mn2(SO4)3, in turn prepd. by electrochem. oxidn. of a Mn2+ salt in a sep. reaction vessel. Data for 3 runs were given. [on SciFinder (R)] ...

(Givaudan, L., et Cie. S. A., Switz.).1984

Electrochemical production of ceric sulfate in concentrated sulfuric acid

Christos Comninellis

The electrochem. prepn. of ceric sulfate [13590-82-4] was studied in concd. H2SO4 (10 mol/dm3). The current efficiency of the reaction increases considerably if a mixed catalyst (Ag2SO4 + MnSO4) is used. [on SciFinder (R)] ...

1983

Direct microgravimetric measurement of sorption kinetics under conditions of reaction

Albert Renken

A gravimetric app. contg. catalyst particles (H2SO4 on silicate) is used to det. the ethylene [74-85-1] absorption rate during the prepn. of vinyl acetate [108-05-4] from ethylene and AcOH. The influence of the absorption process on the overall reaction at ...

1983

Electrochemical production of manganic sulfate in concentrated sulfuric acid

Christos Comninellis

The electrochem. prepn. of Mn2(SO4)3 [13444-72-9] was studied in concd. H2SO4 (15-17M). The reaction must be effected at high temp. (80-90 Deg) and in the presence of Ag ion as catalyst. [on SciFinder (R)] ...

1982

The oxidation of o-nitrotoluene to o-nitrobenzaldehyde with electrogenerated cobaltic sulfate

Christos Comninellis

Indirect electrochem. oxidn. of o-nitrotoluene to o-nitrobenzaldehyde by Co(III) was studied. The highest aldehyde yield (.apprx.80%) is obtained in dispersing a 70-fold excess of o-nitrotoluene in a soln. of Co2(SO4)3 in 60% H2SO4 at 12 Deg. The influence ...

1979

Chlorosulfonic acid

Albert Renken

High-purity HSO3Cl is prepd. at a high space-time yield by mixing and reacting gaseous HCl with SO3 dissolved in ClSO3H, contg. 0.3-1.4% SO3 at 70-100 Deg in a venturi tube at 1-1.1 mol HCl/mol SO3. Thus, into the throat of a vertical venturi tube was fed ...

(Hoechst A.-G., Fed. Rep. Ger.).1979

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