Effect of concentrated NaCl on catalytic wet oxidation (CWO) of short chain carboxylic acids

Catalytic activity of CuO-supported catalyst in phenol oxidation, and the influence of reaction conditions, viz. temperature (125-170 °C), oxygen partial pressure (1-7 MPa) and liquid feed (30-760 ml h-1), in the continuous operation using 17.9 mm i.d. trickle-bed reactor is presented. The hydrodynamic impact on the three-phase trickle-bed reactor performance in an environmental application of catalytic wet oxidation was also investigated. The results of trickle-bed operation were strongly influenced by wetting efficiency. An insufficient catalyst wetting can be to compensated by filling the catalyst bed voids by fine glass spheres. In the case of the gas transfer limited reaction, a better wetting of the catalyst can lead to worse reactor performance due to lower reaction rates.

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Selective Organic Removal from the Alumina Industrial Liquor: Wet Oxidation and Catalytic Wet Oxidation of Disodium Malonate

Industrial & Engineering Chemistry Research ◽

10.1021/ie010364f ◽

2002 ◽

Vol 41 (5) ◽

pp. 1166-1170 ◽

Cited By ~ 6

Author(s):

Sharon Eyer ◽

Suresh Bhargava ◽

James Tardio ◽

Deepak B. Akolekar

Keyword(s):

Wet Oxidation ◽

Catalytic Wet Oxidation ◽

Organic Removal

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Structure-Specific Aerobic Defluorination of Short-Chain Fluorinated Carboxylic Acids by Activated Sludge Communities

Environmental Science & Technology Letters ◽

10.1021/acs.estlett.1c00511 ◽

2021 ◽

Author(s):

Shun Che ◽

Bosen Jin ◽

Zekun Liu ◽

Yaochun Yu ◽

Jinyong Liu ◽

...

Keyword(s):

Activated Sludge ◽

Carboxylic Acids ◽

Short Chain

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Monitoring the short-chain carboxylic acids produced during the storage of different fatty composition biodiesels and their binary blends using ion chromatography

Fuel ◽

10.1016/j.fuel.2020.119943 ◽

2021 ◽

Vol 289 ◽

pp. 119943

Author(s):

Patrícia T. Souza ◽

Willian L.G. Silva ◽

Antonio J.A. Meirelles ◽

Matthieu Tubino

Keyword(s):

Carboxylic Acids ◽

Ion Chromatography ◽

Short Chain ◽

Binary Blends

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Catalytic wet oxidation of high concentration pharmaceutical wastewater with Fe3+ as catalyst

Water Science & Technology ◽

10.2166/wst.2018.216 ◽

2018 ◽

Vol 2017 (3) ◽

pp. 661-666

Author(s):

Xu Zeng ◽

Jun Liu ◽

Jianfu Zhao

Keyword(s):

Oxygen Pressure ◽

Batch Reactor ◽

Oxygen Demand ◽

Kinetic Studies ◽

Cod Removal ◽

Wet Oxidation ◽

Catalytic Wet Oxidation ◽

Pharmaceutical Wastewater ◽

High Concentration ◽

Temperature Time

Abstract Catalytic wet oxidation of high concentration pharmaceutical wastewater with Fe3+ as catalyst was carried out in a batch reactor. Results showed that the degradation of pharmaceutical wastewater was enhanced significantly by Fe3+. The effects of reaction parameters, such as the catalyst dose, reaction temperature, time, and initial oxygen pressure, were discussed. The chemical oxygen demand (COD) removal increased with the increases of catalyst dose, temperature, time and oxygen supply. With the initial COD 34,000–35,000 mg/L, approximately 70% COD removal can be achieved under the conditions of catalyst 1.0 g and oxygen pressure 1.0 MPa at 250 °C after 60 min. The results of kinetic studies showed that two reaction steps existed in this oxidation process, which followed an apparent first-order rate law. This process provides an effective approach for the pretreatment of high concentration pharmaceutical wastewater.

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Degrees of order of solubilized alkanes, alcohols, carboxylates, and carboxylic acids in oriented lyomesophases

Canadian Journal of Chemistry ◽

10.1139/v77-328 ◽

1977 ◽

Vol 55 (12) ◽

pp. 2404-2410 ◽

Cited By ~ 12

Author(s):

Douglas M. Chen ◽

Fred Y. Fujiwara ◽

Leonard W. Reeves

Keyword(s):

Carboxylic Acids ◽

Chain Length ◽

Linear Increase ◽

Short Chain ◽

Appreciable Amount ◽

Linear Region ◽

Short Chain Length ◽

Chain Lengths ◽

Degree Of Order ◽

Limiting Value

The degree of order of solubilized molecules and ions in oriented lyomesophases has been determined at specifically deuterated C—D bond axes from the quadrupole splitting of the deuterium magnetic resonance. Mixtures at low concentration of specifically deuterated alkanes, alcohols, carboxylic acids, and carboxylates of different chain length have been observed in host cationic and anionic lyomesophases. The degree of order of a given C—D position in alcohols increases strongly with chain length up to a length comparable with the host detergent. A broad series of carboxylic acids and carboxylate ions from C2 to C16 have been deuterated in the α position. The α-C—D bond axis in the solubilisate increases in order with chain length, the anion having lower order than the parent acid. An accurately linear increase in the degree of order of the α position is observed for intermediate chain lengths. At chain lengths approximately equal to the host chain lengths the α position reaches a limiting value in the degree of order and further segments do not influence the order. At short chain lengths the degree of order is less than that predicted from extrapolation of order in the linear region. This has been interpreted in terms of distribution into the aqueous compartment by the solubilisates of short chain length. Acetic acid and the acetate, propionate, butanoate, and pentanoate ions spend an appreciable amount of time in the aqueous region. An estimate has been made of these distributions based on reasonable assumptions.

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