Phthalic acid Research Papers - Academia.edu (original) (raw)

Chelating resin based on phthalic acid-formaldehyde-resorcinol (PFR) had been synthesized and characterized by FTIR and elemental analysis. The resin had been studied as chelating sorbent for several metal ions [Ni(II), Cu(II), Zn(II),... more

Chelating resin based on phthalic acid-formaldehyde-resorcinol (PFR) had been synthesized and characterized by FTIR and elemental analysis. The resin had been studied as chelating sorbent for several metal ions [Ni(II), Cu(II), Zn(II), Cd(II) and Pb(II) ]. The ion exchange capacity order is Ni(II) > Zn(II) > Cu(II) > Cd(II) > Pb(II). The ion exchange capacity for Cu(II) was 0.9736 mmol/g of dry resin. The distribution coefficient (K d) for five metal ions were determined in tartaric acid at different pH and concentration. The quantitative separations achived on the column of the chelating resin include Pb(II)-Cd(II), Pb(II)-Zn(II), Cu(II)-Pb(II). The morphology of PFR resin had been examined by SEM and optical photograph. The thermodynamic parameters such as activation energy (E a), entropy (S*), enthalpy (H*) and free energy (G*) for degradation were calculated from TGA data. The resin exhibits better exchange capacities for transition metal ions than heavy metal ions. The more amorphous character is responsible for the higher exchange capacities for transition metal ions and also the stable chelates are formed with transition metal ion as compared to heavy metal ions with PFR resin.

A green and simple procedure for the thiocyanation of aromatic and heteroaromaric compounds in the presence of a catalytic amount of phthalic acid in water/ethanol is described. The reactions proceed at high yields, short reaction... more

A green and simple procedure for the thiocyanation of aromatic and
heteroaromaric compounds in the presence of a catalytic amount of phthalic acid in
water/ethanol is described. The reactions proceed at high yields, short reaction times
and mild conditions.

In this paper we present a detailed conformational study of three aromatic systems constituting the basic units of humic acids namely benzoic acid, salicylic acid and phthalic acid. The genetic algorithm, based on the multi-niche crowding... more

In this paper we present a detailed conformational study of three aromatic systems
constituting the basic units of humic acids namely benzoic acid, salicylic acid and
phthalic acid. The genetic algorithm, based on the multi-niche crowding (MNC)
method, coupled with the semi-empirical AM1 method is used to analyze the potential
energy surface (PES) of these systems. This algorithm, implemented in the MOPAC
program and piloted by scripts, provides better detection of global and local minima in
a reasonable time. The results obtained are comparable with those of previous studies.
Three factors can be cited to justify the stability of conformations i.e. effects of
conjugation, steric interactions and intramolecular hydrogen bonds

In this paper we present a detailed conformational study of three aromatic systems constituting the basic units of humic acids namely benzoic acid, salicylic acid and phthalic acid. The genetic algorithm, based on the multi-niche crowding... more

In this paper we present a detailed conformational study of three aromatic systems constituting the basic units of humic acids namely benzoic acid, salicylic acid and phthalic acid. The genetic algorithm, based on the multi-niche crowding (MNC) method, coupled with the semi-empirical AM1 method is used to analyze the potential energy surface (PES) of these systems. This algorithm, implemented in the MOPAC program and piloted by scripts, provides better detection of global and local minima in a reasonable time. The results obtained are comparable with those of previous studies. Three factors can be cited to justify the stability of conformations i.e. effects of conjugation, steric interactions and intramolecular hydrogen bonds.

Abstract A sensitive and selective column adsorption method is proposed for the off-line preconcentration and determination of phthalic acid esters (PAEs), namely benzyl-butyl phthalate (BBP), di-n-butyl phthalate (DBP) and di-cyclohexyl... more

Abstract A sensitive and selective column adsorption method is proposed for the off-line preconcentration and determination of phthalic acid esters (PAEs), namely benzyl-butyl phthalate (BBP), di-n-butyl phthalate (DBP) and di-cyclohexyl phthalate (DCHP). The PAEs was preconcentrated on Saccharomyces cerevisiae immobilized on silica gel and then determined by high performance liquid chromatography (HPLC). Several parameters on the recovery of the analytes were investigated. Recoveries of BBP, DBP and DCHP were 100±2, 98±2 and 98±3%, respectively, at 95% confidence level under optimum conditions. The detection limits (3S/N) of BBP, DBP and DCHP were 3.2, 6.3 and 3.1 μg l−1, respectively. The capacity of the adsorbent was also examined and found to be 1.4 mg g−1 for BBP and DBP, and 3.6 mg g−1 for DCHP. S. cerevisiae immobilized on silica gel is suitable for repeated use without decreasing recovery up to about 25 adsorption–elution cycles. The proposed method was successfully applied to the determination of PAEs in river water with high precision and accuracy.

A simple, highly efficient and green procedure for the condensation of o-phenylenediamine with α-diketones in the presence of catalytic quantity of phthalic acid(0.0083 g, 5mol%) at room temperature was done. Using this method,... more

A simple, highly efficient and green procedure for the condensation of o-phenylenediamine with α-diketones in the presence of catalytic quantity of phthalic acid(0.0083 g, 5mol%) at room temperature was done. Using this method, quinoxaline derivatives as biological fascinating compound are produced in good to excellent yields and short reaction times. Keywords:Quinoxaline, o-Phenylenediamine, α-Diketone, Phthalic acid, Green chemistry.