Orientation of benzoic acid and terephthalic acid on an alumina surface and their reactivities observed by infrared spectroscopy

1991 ◽  
Vol 4 (6) ◽  
pp. 346-352 ◽  
Author(s):  
Haruo Ogawa
Keyword(s):  
Infrared Spectroscopy ◽  
Benzoic Acid ◽  
Terephthalic Acid ◽  
Alumina Surface

Anaerobic pre-treatment of petrochemical effluents: terephthalic acid wastewater

1997 ◽  
Vol 36 (2-3) ◽  
pp. 237-248 ◽  
Author(s):  
Robbert Kleerebezem ◽  
Joost Mortier ◽  
Look W. Hulshoff Pol ◽  
Gatze Lettinga
Keyword(s):  
Acetic Acid ◽  
Benzoic Acid ◽  
Terephthalic Acid ◽  
Anaerobic Degradation ◽  
Anaerobic Treatment ◽  
High Rate ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Pre Treatment ◽  
Uasb Reactors

During petrochemical production of purified terephthalic acid (PTA, 1,4-benzene dicarboxylic acid), a large quantity of concentrated effluent is produced. Main polluting compounds in this wastewater are terephthalic acid, acetic acid and benzoic acid in decreasing order of concentration. Acetic acid and benzoic acid are known to be rapidly degraded in high rate anaerobic treatment systems, such as Upflow Anaerobic Sludge Bed (UASB) reactors. Concerning the kinetics of anaerobic mineralization of terephthalic acid, however, no information is available in literuature. Therefore our work focused on the anaerobic degradation of neutralized terephthalic acid (disodium terephthalate) in laboratory scale UASB-reactors and batch reactors. It was found that high rate anaerobic treatment of terephthalate was difficult to obtain due to the low growth rate (μ ≈ 0.04 day−1) of the terephthalate mineralizing mixed culture. The maximum removal capacity of a lab-scale UASB-reactor was found to be 3.9 g COD.1−1 .day−1 at a loading rate of 4.5 g COD.1−1 .day−1 and a hydraulic retention time of 24 hours. Terephthalate was used as sole carbon source during these experiments. Addition of small amounts of sucrose (co-substrate) to the influent, as a source of reducing equivalents, was found to have a negative influence on the anaerobic degradation of terephthalate. Also benzoate was found to inhibit the mineralization of terephthalate. Batch-toxicity experiments showed that terephthalate is not toxic to any of the species involved in its mineralization. Based on these observations, a staged anaerobic reactor system is suggested for the anaerobic pre-treatment of PTA-wastewater.

scholarly journals Some Decomposition Routes in the Mass Spectra of Aromatic Carboxylic Acids

1965 ◽  
Vol 20 (7) ◽  
pp. 883-887 ◽  
Author(s):  
J. H. Beynon ◽  
B. E. Job ◽  
A. E. Williams
Keyword(s):  
Carboxylic Acid ◽  
Benzoic Acid ◽  
Terephthalic Acid ◽  
Phthalic Acid ◽  
Mass Spectra ◽  
Deuterium Atom ◽  
Acid Group ◽  
Isophthalic Acid ◽  
Carboxylic Acid Group ◽  
Hydrogen Atoms

The mass spectra of benzoic acid, phthalic acid, isophthalic acid and terephthalic acid, together with the analogues deuterated on the carboxylic acid group have been studied. Exchange of the deuterium atom with hydrogen atoms on the positions ortho to a carboxylic acid group on the aromatic ring has been studied using meta-stable peaks.

Variable Temperature Infrared Spectroscopy Investigations of Benzoic Acid Desorption from Sodium and Calcium Montmorillonite Clays

2015 ◽  
Vol 69 (12) ◽  
pp. 1381-1389 ◽  
Author(s):  
Tara M. Nickels ◽  
Audrey L. Ingram ◽  
Dalia K. Maraoulaite ◽  
Robert L. White
Keyword(s):  
Infrared Spectroscopy ◽  
Benzoic Acid ◽  
Variable Temperature ◽  
Montmorillonite Clays

Near Infrared Spectroscopy of Benzoic Acid Adsorbed on Montmorillonite

2010 ◽  
Vol 43 (4) ◽  
pp. 266-274 ◽  
Author(s):  
Longfei Lu ◽  
Jingong Cai ◽  
Ray L. Frost
Keyword(s):  
Infrared Spectroscopy ◽  
Benzoic Acid ◽  
Near Infrared Spectroscopy ◽  
Near Infrared

scholarly journals Fluorescent Sensors For Hg2+ and Cu2+ Based On Condensation Products of 4H-1,2,4 Triazole-4-Amine And Carboxylated Benzoic Acids

2021 ◽  
Author(s):  
Satyapriya Deka ◽  
Ankur K Guha ◽  
Diganta Kumar Das
Keyword(s):  
Benzoic Acid ◽  
Terephthalic Acid ◽  
Phthalic Acid ◽  
Copper Ion ◽  
Binding Constants ◽  
Isophthalic Acid ◽  
Benzoic Acids ◽  
Health Issues ◽  
Derivatives Of ◽  
Optimized Geometries

Abstract Mercury (Hg) causes serious health issues in its all forms. Deficiency as well as excess of copper ion (Cu2+) in human body is hazardous. A series of four compounds have been derived from carboxylated benzoic acids (benzoic acid, isophthalic acid, terephthalic acid and phthalic acid) and 4H-1,2,4 triazole-4-amine and characterized. Fluorescencce detection of Hg2+ was recorded by the derivates with benzoic acid and isophthalic acid while the derivatives of terephthalic acid and phthalic acid detect Cu2+ by fluorescence “off” mode. Metal ions like Li+, Na+, K+, Zn2+, Al3+, Mg2+, Mn2+, Co2+, Ni2+, Cu2+, Cd2+, Pb2+ and Hg2+ found not to interfere. The stoichiometry of binding is 1:1 for the benzoic acid derivative with Hg2+ while it is 1:2 for the other three derivatives. The binding constants are ca. 10− 4.5 between the sensors and Hg2+ or Cu2+ and detection limits are around 10− 5.5 M. DFT calculation provided optimized geometries of the sensors and confirmed the stoichiometry of binding with Hg2+/Cu2+.

Oxidation of p–xylene to terephthalic acid in benzoic acid and methyl ester of p–toluic acid

1987 ◽  
Vol 52 (9) ◽  
pp. 2241-2247 ◽  
Author(s):  
Milan Hronec ◽  
František Masarovič ◽  
Zuzana Cvengrošová ◽  
Ján Ilavský
Keyword(s):  
Methyl Ester ◽  
Benzoic Acid ◽  
Terephthalic Acid ◽  
Cobalt Catalyst ◽  
Peroxy Radicals ◽  
Pyridine Ligands ◽  
Hydrolysis Of

The oxidation of p-xylene to terephthalic acid has been studied at 130 to 190 °C, using benzoic acid and methyl ester of p-toluic acid as the solvent. It was found that the solvent affects strongly the activity of the cobalt catalyst which effect is dependent on the presence of bromide and pyridine ligands. In the methyl ester of p-toluic acid as the solvent, cobalt-bromide catalysts induce also hydrolysis of the methyl ester which proceeds parallelly to the oxidation of p-xylene. The activating effect of bromide and pyridine ligands results from their effect on the rate of the reaction of peroxy radicals with the catalyst in the propagation step and from their effect on the rate of consecutive oxidation of p-toluic acid to terephthalic acid.

Further Studies on the Preparation of Terephthalic Acid from Phthalic or Benzoic Acid

1960 ◽  
Vol 25 (12) ◽  
pp. 2082-2087 ◽  
Author(s):  
YOSHIRO OGATA ◽  
MASARU HOJO ◽  
MASANOBU MORIKAWA
Keyword(s):  
Benzoic Acid ◽  
Terephthalic Acid
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