Oxidation Of Cyclododecane Research Articles

Multistage bubble suspended-bed column reactor for hydrocarbon oxidation processes

The results of testing a bubble column reactor in the oxidation of cyclododecane by air oxygen in the presence of boric acid at a temperature of 160–165°C and atmospheric pressure are given. A characteristic feature of the multistage column reactor is a number of flow circuits organized via gas-lift pipes arranged above each other. The solid phase (catalyst) is fed at the top into the upper flow circuit and further distributed among all the flow circuits over the liquid volume. The reactor may find applications in catalytic reactions and continuous processes of dissolution, flotation, contact crystallization, and hydraulic classification.

Highly selective synthesis of cyclododecanone over mesostructured VSBA-15 catalysts

Highly ordered VSBA-15 mesoporous catalysts have been synthesized under pH-adjusting direct hydrothermal (pH-aDH) method using vanadyl sulphate hydrate and Pluronic P123 as the sources of vanadium and template, respectively. The mesoporous catalysts characterized by sophisticated instrumental techniques, viz. ICP-AES, XRD, N 2 adsorption, ESR, UV–vis DRS, 51V MAS NMR, 29Si MAS NMR and TEM show their two-dimensional mesostructures with tetrahedral vanadium species on the silica surface. The well ordered VSBA-15 catalysts have been used in the oxidation of cyclododecane (CDD) with hydrogen peroxide (H 2O 2, 30%) to find their catalytic activities. The regenerated VSBA-15 catalysts have been examined to find their catalytic stabilities. VSBA-15(5) catalyst has been washed with ammonium acetate solution to investigate the leaching of vanadium species in the framework of silica network of SBA-15, and the catalytic activity of washed VSBA-15(5) has also been examined in the catalytic reactions. Moreover, the hydrothermally stable VSBA-15(5) catalyst has also been examined in the catalytic reaction to find the effect of its catalytic activity. Additionally, the influences of various reaction parameters such as temperature, time, ratios of reactant and solvents on the oxidation of CDD have been investigated. Based on the catalytic results, VSBA-15(5) catalyst is found to be a highly active, recyclable and promising heterogeneous catalyst for selective synthesis of cyclododecanone (CDD O).

A New Insight into the Oxidation of Cyclododecane with Hydrogen Peroxide in the Presence of Iron-Substituted Polyoxotungstates

The catalytic homogeneous oxidation of cyclododecane with hydrogen peroxide in the presence of tetrabutylammonium salts of iron-substituted Keggin-type polyoxotungstates of general formula (TBA) 4 H z XW 11 Fe(H 2 O)O 39 ·nH 2 O (where X = P, Si, B, and z = 0-2) is described. In the reaction conditions reported, the corresponding alcohol, ketone, and hydroperoxide are obtained as the main reaction products. The catalytic activity of the anions with phosphorous, silicon, and boron is compared in different reaction conditions. These catalytic oxidation reactions seem to be radical processes, since they are totally inhibited in the presence of I 2 , a well-known radical scavenger.

Study of the kinetics and mechanism of the liquid-phase oxidation of cyclododecane by molecular oxygen—III. Kinetics of the decomposition of cyclododecyl hydroperoxide

Study of the kinetics and mechanism of the liquid-phase oxidation of cyclododecane by molecular oxygen—III. Kinetics of the decomposition of cyclododecyl hydroperoxide

The Efficient Oxidation of Alkanes by Hydrogen Peroxide in Pyridine Mixed Solvents Catalysed by Copper and Other Transition Metal Salts

The catalytic activity of Cu II , Fe III , Co II , Ru III , Ni II and other transition metal salts in the oxidation of cyclododecane by H 2 O 2 was studied for several mixed solvent systems PyX−S−H 2 O = 2:1:0.09 (volume ratio), were PyX is pyridine (Py) or substituted pyridines, and S = MeCN, Bu’OH or acetone; the highest yield, ca . 25% of alkane conversion and 10% efficiency for H 2 O 2 , was found for Py-MeCN mixtures.

Oxidation of cyclododecane in the presence of anthraquinone and o-nitrophenol : B. Ya. Ladygin, L. G. Bodachenko and V. N. Shurayeva, Neftekhimiya 23, No. 5, 664–669, 1983

Oxidation of cyclododecane in the presence of anthraquinone and o-nitrophenol : B. Ya. Ladygin, L. G. Bodachenko and V. N. Shurayeva, Neftekhimiya 23, No. 5, 664–669, 1983

Preparation of 1,10-decanedicarboxylic acid by liquid-phase oxidation of cyclododecanone

IT WAS pointed out in previous investigations [1] that 1,10-decanediearboxylic acid, an analogue of sebaeic acid, can be synthesized from divinyl via the stage of preparing cyclododecanol by liquid-phase oxidation of cyclododecane in the presence of boric acid. Further oxidation of eyelododecanol with nitric acid produces 1,10-decanedicarboxylic acid with a yield of 92 % of the stoichiometric. Data in this paper were obtained during a s tudy of liquid-phase oxidation of eyclododecanone by molecular oxygen to 1,10-decanedicarboxylic acid. Cyclododecanone can be prepared from cyclododecanol by dehydrogenation over nickel-chromium or copper-chromium catalysts [1, 2, 3]. I~fformation is given in the literature on the preparation of dicarboxylic acids by liquid-phase oxidation of corresponding cyclic ketches [4-7]. However, on the preparation of 1,10-decanediearboxylic acid by this method, only patent data are available [8].

The production of cyclododecanol by the liquid-phase oxidation of cyclododecane

THE higher cyclic alcohols are of great interest for various branches of the national economy. They may be used as intermediate products for the synthetic fibre industry (polyamide fibres of the type of rilsan), plastics, diearboxylic acids, plastieizers, and synthetic lubricating materials, in perfumery, etc. At the present time there is no industrial method for the production of higher cyclic alcohols. In recent years, the work of Russian and foreign investigators has shown that the polymerization of diolefins over organoaluminium catalysts can give high yields of cyclic hydrocarbons, such as, for example, cyclo-octa-l,5-diene, cyclododeca-l,5,9-triene, and others, which in their turn may readily be converted into naphthenic hydrocarbons [1-4]. A scheme for the conversion of cyelododeca-l,5,9-triene into decane-l.10dicarboxy]ic acid and o)-dodecalactam has been proposed [1]: