Hydrothermal oxidation of model molecules and industrial wastes

Styrene-acrylonitrile random copolymer (SAN) and polyarylate (PAr) block copolymer were applied as a reactive compatibilizer for polyamide-6 (PA-6)/acrylonitrile-butadiene-styrene (ABS) copolymer blends. The SAN-PAr block copolymer was found to be effective for compatibilization of PA-6/ABS blends. With the addition of 3.0 -5.0 wt % SAN-PAr block copolymer, the ABS-rich phase could be reduced to a smaller size than 1.0 m in the 70/30 and 50/50 PA-6/ABS blends, although it was several microns in the uncompatibilized blends. As a result, for the blends compatibilized with 3-5 wt % block copolymer the impact energy absorption reached the super toughness region in the 70/30 and 50/50 PA-6/ABS compositions. The compatibilization mechanism of PA-6/ABS by the SAN-PAr block copolymer was investigated by tetrahydrofuran extraction of the SAN-PAr block copolymer/PA-6 blends and the model reactions between the block copolymer and low molecular weight compounds. The results of these experiments indicated that the SAN-PAr block copolymer reacted with the PA-6 during the melt mixing process via an in situ transreaction between the ester units in the PAr chain and the terminal amine in the PA-6. As a result, SAN-PAr/PA-6 block copolymers were generated during the melt mixing process. The SAN-PAr block copolymer was supposed to compatibilize the PA-6 and ABS blend by anchoring the PAr/PA-6 and SAN chains to the PA-6 and ABS phases, respectively.

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“… (a) SCWO principle and (b) schematic flowsheet for the SCWO process. The inlet shows the multi‐injection reactor 18…”

Section: Supercritical Water Oxidation (Scwo)mentioning

confidence: 99%

“…For instance this feature has been taken into account and solved in the case of the multi‐injection reactor, which allows control of the increase in temperature during the reaction and the use of the chemical energy of the waste (Fig. 2(b)) 18…”

Section: Supercritical Water Oxidation (Scwo)mentioning

confidence: 99%

Application of styrene‐acrylonitrile random copolymer–polyarylate block copolymer as reactive compatibilizer for polyamide and acrylonitrile‐butadiene‐styrene blends

Ohishi

Nishi

2002

J of Applied Polymer Sci

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“…The main advantage of that technology is that the by‐products of the process are nontoxic. Indeed, carbon is oxidized into carbon dioxide and hydrogen into water, while hetero‐atoms are converted into mineral salts 1–4. .…”

Section: Introductionmentioning

confidence: 99%

Modeling and simulation of hydrothermal oxidation of organic compounds

et al. 2005

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“…Oxidation of wastewaters at high pressure and temperature, so-called hydrothermal oxidation treatment (HOT), is an efficient alternative to conventional methods such as biological treatments or common chemical processes in the treatment of highly contaminated wastewaters with an organic concentration between 10 to 70 g/l [1,2,3]. HOT can operate in conditions below or above the critical point of water (374.2ºC and 22.1 MPa).…”

Section: Introductionmentioning

confidence: 99%

New approach for kinetic parameters determination for hydrothermal oxidation reaction

Matéos

Portela

Mercadier

et al. 2005

The Journal of Supercritical Fluids

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The purpose of this study is to test Runge-Kutta algorithm to obtain reliable kinetic parameters for the hydrothermal oxidation of organic compounds. A tubular reactor system was used to carry out the oxidation of several model compounds: acetic acid, methanol and phenol. All experiments were performed in isothermal conditions in a temperature range varying from 250ºC to 500ºC and at a constant pressure of 25 Mpa. Three different methods, namely pseudo first order kinetics, multiple linear regression and Runge-Kutta algorithm, were used to determine the kinetic parameters. Results obtained by these different methods were similar, so that Runge-Kutta algorithm was validate for the determination of kinetic parameters. In contrast with the pseudo first order kinetics and the multi linear regression, Runge-Kutta algorithm was more convenient for the kinetic parameter determination starting from experiments performed at the laboratory scale or in industrial scale pilot plant facilities.

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Hydrothermal oxidation of model molecules and industrial wastes

Cited by 44 publications

References 19 publications

Application of styrene‐acrylonitrile random copolymer–polyarylate block copolymer as reactive compatibilizer for polyamide and acrylonitrile‐butadiene‐styrene blends

Application of styrene‐acrylonitrile random copolymer–polyarylate block copolymer as reactive compatibilizer for polyamide and acrylonitrile‐butadiene‐styrene blends

Modeling and simulation of hydrothermal oxidation of organic compounds

New approach for kinetic parameters determination for hydrothermal oxidation reaction

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