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Benzoic Acid

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Josef Breu – 1st expert on this subject based on the ideXlab platform

  • co crystallisation of Benzoic Acid with sodium benzoate the significance of stoichiometry
    CrystEngComm, 2012
    Co-Authors: Christian Butterhof, Wolfgang Milius, Josef Breu

    Abstract:

    Currently the synthesis of co-crystals is receiving considerable attention. We studied co-crystallisation of Benzoic Acid with sodium benzoate in different ratios and with different crystallisation techniques. A crystalline co-crystal, composed of two equivalents of Benzoic Acid and one equivalent of sodium benzoate (2 HBz·1 NaBz) could be identified and structurally characterised. By concomitant coordination of benzoate and Benzoic Acid the coordination needs of the cation could be satisfied. However, even with a 2 : 1 ratio, an octahedral environment could only be realised by sharing an edge in a dimer. The dimers are connected to one-dimensional tapes which in turn are packed in a distorted hexagonal arrangement. Only with a ratio of two neutral Benzoic Acid ligands and one benzoate can the coordination requirements of the sodium cation and charge neutrality be assured at the same time.

Santiago Esplugas – 2nd expert on this subject based on the ideXlab platform

  • Photodegradation of Benzoic Acid in Aqueous Solutions
    Environmental Technology, 1998
    Co-Authors: D. Oussi, Asmae Mokrini, Esther Chamarro, Santiago Esplugas

    Abstract:

    The photodegradation of Benzoic Acid in aqueous solutions using a medium pressure UV source has been studied. The effect of temperature, pH and initial concentration of the organic pollutant was examined. The results show that on increasing temperature, (from 25°C to 50°C), the conversion increases by 20%. Augmentation of pH or initial concentration of Benzoic Acid leads to the opposite effect. The degradation rate follows first order kinetics with respect to the radiation absorption rate. Through the evaluation of the amount of photons absorbed by the Benzoic Acid, the quantum yield (average between 240–300 nm) was obtained (6×10−2 mol einstein−1 at 25°C).

  • Photodegradation of Benzoic Acid in aqueous solutions
    Environmental Technology (United Kingdom), 1998
    Co-Authors: D. Oussi, Asmae Mokrini, Esther Chamarro, Santiago Esplugas

    Abstract:

    The photodegradation of Benzoic Acid in aqueous solutions using a medium pressure UV source has been studied. The effect of temperature, pH and initial concentration of the organic pollutant was examined. The results show that on increasing temperature, (from 25°C to 50°C), the conversion increases by 20%. Augmentation of pH or initial concentration of Benzoic Acid leads to the opposite effect. The degradation rate follows first order kinetics with respect to the radiation absorption rate. Through the evaluation of the amount of photons absorbed by the Benzoic Acid, the quantum yield (average between 240–300 nm) was obtained (6×10 −2 mol einstein −1 at 25°C). © Publications Division Selper Ltd., 1998.

Juanjuan Zhang – 3rd expert on this subject based on the ideXlab platform

  • determination of Benzoic Acid in soft drinks by gas chromatography with on line pyrolytic methylation technique
    Analytica Chimica Acta, 2005
    Co-Authors: Lili Wang, Weimin Mo, Chen Wang, Wei Hu, Juanjuan Zhang

    Abstract:

    Abstract A new application of pyrolytic methylation was developed to determine Benzoic Acid in soft drinks by gas chromatography (GC) without using any pretreatment procedures and special pyrolyzer. With the on-line pyrolytic methylation by tetramethylammonium hydroxide (TMAH), Benzoic Acid was converted into its corresponding methyl ester in the injector at 280 °C. Thus, samples containing Benzoic Acid could be well determined by direct-injection in GC on the medium polar stationary phase column. To obtain optimum methylation conditions, important factors were investigated and then applied to the following experiments. The results were obtained as following: 280 °C as reaction temperature, 2:1 as the proportion of TMAH to Benzoic Acid. The storage time of mixed solution had no obvious effect on the area of Benzoic Acid methyl ester peak. With the p-xylene as an inter-standard, GC behaviors were investigated under these optimum conditions. The linear range achieved for Benzoic Acid was 1–10,000 mg/l with the correlation coefficient of 0.9985. The precision was quite high with the R.S.D. of 2.8% and the limit of detection reached 0.1 mg/l. The potential of the proposed method was assessed by applying it to the determination of Benzoic Acid in soft drinks. The results obtained coincided with the statement on the labels and all of the detected data were below the maximum permitted concentration of the European Union Legislation. This on-line pyrolytic methylation technique was proved to be simple to implement, sensitive and selective.