Solid−Liquid Equilibria for Benzoic Acid +p-Toluic Acid + Chloroform, Benzoic Acid +p-Toluic Acid + Acetic Acid, and Terephthalic Acid + Isophthalic Acid +N,N-Dimethylformamide

2005 ◽  
Vol 50 (1) ◽  
pp. 119-121 ◽  
Author(s):  
Dian-Qing Li ◽  
Yan-Jun Lin ◽  
David G. Evans ◽  
Xue Duan
Keyword(s):  
Acetic Acid ◽  
Benzoic Acid ◽  
Terephthalic Acid ◽  
Isophthalic Acid ◽  
Solid Liquid

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.

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+.

Solubilities of Isophthalic Acid in Ternary Mixtures of Acetic Acid + Water + Benzoic Acid from 292.55 to 372.10 K

2018 ◽  
Vol 63 (5) ◽  
pp. 1363-1369 ◽  
Author(s):  
Shuyu Ning ◽  
Weifeng Chen ◽  
Teng Pan ◽  
Youwei Cheng ◽  
Lijun Wang ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Benzoic Acid ◽  
Isophthalic Acid ◽  
Ternary Mixtures ◽  
Acid Water ◽  
Acetic Acid Water

scholarly journals Oxidative Study of Benzaldehyde by Isoqauinolinium Bromo Chromate

2019 ◽  
Vol 16 ◽  
pp. 5354-5359
Author(s):  
Arun Kumar Dwivedi ◽  
K. N. Sharma ◽  
Arvind Prasad Dwivedi
Keyword(s):  
Dielectric Constant ◽  
Acetic Acid ◽  
Complex Formation ◽  
Benzoic Acid ◽  
Neutral Salt ◽  
Kinetics Analysis ◽  
Keto Form ◽  
Acetic Acid Medium ◽  
Oxidative Reaction ◽  
Rate Of Reaction

The kinetics analysis of the oxidative reaction between benzaldehyde and oxidant is quinolinium Bromo chromate was reported in aqueous 40% acetic acid medium at 313 K. The rate of reaction varies first-power of [IQBC] and [H2SO4], whereas fractional-order kinetics was observed for benzaldehyde. The rate constant gradually increases with decrease in dielectric constant of the medium. The neutral salt does not alter the rate. The metal cations (Cu++) slightly accelerate the rate of oxidation when added to reaction mixture. The study rules out the participation of keto form of substrate in complex formation. Benzoic acid was identified as the end-product in stoichiometrically 1:1 based mechanism. The rate law was derived in accordance with the kinetic results.

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