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Josef Breu - One of the best experts 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 - One of the best experts 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 - One of the best experts 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.

R.a. Lewis - One of the best experts on this subject based on the ideXlab platform.

  • Absorption spectra of Benzoic Acid in the 5–15 THz range
    Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2014 39th International Conference on, 2014
    Co-Authors: Joseph Horvat, L. M. Lepodise, R.a. Lewis
    Abstract:

    Absorption spectra of Benzoic Acid were measured between 5 and 15 THz. Hybrid DFT modeling does not reproduce the most intense absorption band at 8.61 THz. The same modeling on Benzoic Acid dimer reveals that the absorption bands at 8.61 and 12.7 THz occur because of inter-molecular in-plane and out-of-plane vibrations of the dimer, respectively. The hydrogen bond length in dimer changes for these modes.

  • Absorption spectra of Benzoic Acid in the 5–15 THz range
    2014 39th International Conference on Infrared Millimeter and Terahertz waves (IRMMW-THz), 2014
    Co-Authors: Joseph Horvat, L. M. Lepodise, R.a. Lewis
    Abstract:

    Absorption spectra of Benzoic Acid were measured between 5 and 15 THz. Hybrid DFT modeling does not reproduce the most intense absorption band at 8.61 THz. The same modeling on Benzoic Acid dimer reveals that the absorption bands at 8.61 and 12.7 THz occur because of inter-molecular in-plane and out-of-plane vibrations of the dimer, respectively. The hydrogen bond length in dimer changes for these modes.

Ake C Rasmuson - One of the best experts on this subject based on the ideXlab platform.

  • solubility of Benzoic Acid in pure solvents and binary mixtures
    Journal of Chemical & Engineering Data, 2010
    Co-Authors: Jyothi Thati, Fredrik L Nordstrom, Ake C Rasmuson
    Abstract:

    The solubility of Benzoic Acid has been determined in ethanol, toluene, heptane, cyclohexane, pentane, and chloroform and in binary mixtures of ethanol + heptane and ethanol + toluene, in the temperature range of (278.15 to 323.15) K. The solubility is high in ethanol, reasonably high in chloroform, lower in toluene, and quite low in the remaining three pure solvents. In the binary mixtures the solubility of Benzoic Acid increases with increasing concentration of ethanol. The solubility of Benzoic Acid increases with increasing temperature.

  • Reaction crystallization kinetics of Benzoic Acid
    Aiche Journal, 2001
    Co-Authors: Marie Ståhl, Bengt L. Åslund, Ake C Rasmuson
    Abstract:

    Benzoic Acid was crystallized in a T-mixer by mixing hydrochloric Acid and an aqueous sodium benzoate solution. Crystallization kinetics were determined by population balance modeling and paramet ...