Isomerization of Maleic Acid to Fumaric Acid Catalyzed by Cerium(IV) and N-Bromo CompoundsCerium(IV) N-bromosuccinimideN-bromoacetamidemaleic acidfumaric acidMaleic acid (MA) in aqueous sulfuric acid undergoes catalytic isomerization in the presence of small amounts of Cerium(IV) ion and N-...
This value for the activation energy corresponds to that reported in the literature for the transformation of maleic acid into fumaric acid. The reaction apparently follows second-order kinetics due to the catalytic effect of the maleic acid on the isomerization....
Esterification of fumaric acid with catalysts,isomerizationof maleic acid and maleate with catalysts were investigated. 催化剂包括酯化催化剂和异构化催化剂, 分别催化富马酸的酯化和马来酸(酯)的异构化. 互联网 The extent ofisomerizationis related to chain element construction, but not dependant on molecula...
in which the degradation of oxalic, fumaric, and maleic acids is reported [47]. Adsorption isotherms indicate that approximately three times more maleic or fumaric acid is bound to TiO2 at pH 3 than at pH 9. Like the butyric acid case, the initial degradation rate is modestly higher at ...
The authors also introduced a medium-pore size zeolite, H-HPM-1 (STW), which they report to be more effective than FER. The catalyst is active and selective from the onset of the reaction and does not deactivate rapidly. The weak acidity and low acid density of the new material are ...
An O6bject of this.invention is to provide a catalytic'mneans whereby the cheap and abundant maleic anhydride is easily and readily...Howland, Louis H.Brucksch Jr., William F.L.H. Howland, W.F. Brucksch Jr., Isomerization of maleic acid to fumaric acid, US Patent 2,454,387 (1948)...
Isomerization Maleic acidDFT calculationsThe isomerization reaction of 2-butenedioic acid in gas phase has been studied using Hartree-Fock (HF), Meller-Plesset to 2nd order (MP2) and BLYP, B3LYP Density Functional Theory (DFT) levels of approximation. Potential energy surfaces (PES) of the ...
IsomerizationMaleic acidFumaric acidFumaric acid is an important food additive and industrial intermediate compound. The traditional methods of producing fumaric acid were catalyzed by maleic acid isomerization. In this study, isomerization of maleic acid in water without catalyst was investigated at ...
Theoretical study of the isomerization of maleic acid into fumaric acid: An approach based on the concept of potential energy surfacepotencial energy surfaceisomerizationmaleic acidlanguage=engA comparative study based on potential energy surfaces (PES) of 2-butanedioic and hypothetic 2-butanedioic/HCl...
fumaric acidIn the presence of a relatively small amount of bromate, maleic acid in aqueous sulfuric acid isomerizes catalytically to fumaric acid in the dark at room temperature. The concomitant presence of a suitable amount of bromine in CCI, phase raises the rate and yield significantly. ...