131-17-9Relevant articles and documents
Synthesis of unsaturated esters via highly efficient esterification catalyzed by polymer grafted quarternary ammonium salts as triphase catalysts
Liang, Zheng Yong,Wang, Li Li,Liu, Hui,Huang, Jin Shuo
, p. 1558 - 1561 (2013)
A series of unsaturated esters were prepared via condensation of sodium carboxylates and alkenyl halide under the condition of macroporous polystyrene grafted quarternary ammonium salt as recyclable phase transfer catalyst, NaI as co-catalyst, Cu powder as inhibitor and H2O as solvent. Under optimal conditions, products yields are 78.2～ 96.0%. The catalyst can be convenient recycled and reutilized for about five times without losing its activity obviously.
Diacidic ionic liquid supported on magnetic-silica nanocomposite: a novel, stable, and reusable catalyst for selective diester production
Fareghi-Alamdari, Reza,Nadiri Niri, Mehri,Hazarkhani, Hassan,Zekri, Negar
, p. 2615 - 2629 (2018/09/13)
Abstract: Supported diacidic ionic liquid on magnetic silica nanoparticles (SDAIL@magnetic nanoSiO2) was successfully prepared through a multi-step approach. 2,2- bis ((3- methylimidazolidin-1-yl) methyl) propane- 1,3- diol bromide salt was immobilized onto the surface of magnetic silica nanoparticles via covalent bonding to prepare a novel powerful acidic catalyst. The synthesized catalyst was characterized by FT-IR, SEM, TGA, VSM, N2 adsorption–desorption measurements and acid-base titration. The catalytic activity of the prepared SDAIL@magnetic nanoSiO2 was investigated for the selective diesterification of alcohols by phthalic anhydride to afford corresponding dialkyl plasticizers under solvent-free conditions. The nature of two acidic counter anions as well as the presence of Lewis acidic species (Fe3O4) on the magnetic nanosilica and high surface area of the nanosilica influenced the behavior of the catalyst. Surperisingly, the high acidic character of the catalyst facilitates the reaction with a short reaction time. Furthermore, TG analysis strongly demonstrates that major content of IL is still stable on the support up to 290?°C, so catalyst has a good thermal stability. Under the optimized conditions, the conversion of phthalic anhydride was 100% and diester plasticizers were obtained with excellent yields (80–100%). The SDAIL@magnetic nanoSiO2 catalyst showed a good reusability and could be easily separated from the reaction mixture using an external magnet thanks to its superparamagnetic behavior and reused for several runs without significant activity loss. An important advantage of the SDAIL@magnetic nanoSiO2 was its high-hydrophilicity resulted in excellent selectivity towards the formation of only diesters which are commonly used plasticizers in different industries. Graphical abstract [Figure not available: see fulltext.].
O-benzenedicarboxylic acid diallyl ester production technology
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Paragraph 0002, (2017/07/19)
The invention discloses an o-benzenedicarboxylic acid diallyl ester production technology. O-benzenedicarboxylic acid diallyl ester is an important chemical product. The production technology comprises the following processes: 1, sodium phthalic anhydride synthesis: stirring 99% phthalic anhydride and 99% flake NaOH solid to react to generate sodium phthalic anhydride, wherein a boiling point of the 99% phthalic anhydride is 295 DEG C, the phthallic anhydride and the NaOH are fed according to a proportion of 1mol to 3.5mol, reaction time is 2h, a reaction conversion rate is calculated as 57.3% according to NaOH, and a production period is about 2h; 2, o-benzenedicarboxylic acid diallyl ester synthesis: indirectly heating and warming reaction fluid in a reaction kettle in the last step through steam, adding a catalyst, indirectly heating and warming temperature to 40 to 60 DEG C by steam, keeping the temperature unchanged, dropwise adding a certain amount of 99% chloropropene and performing condensation polymerization for 4 to 5h in normal pressure, wherein a boiling point of the 99% chloropropene is 45 DEG C, and a production period is about 5h; 3, washing: pumping a material generated by reaction in the last step into a washing kettle, adding technological purified water into the washing kettle, washing off impurities in a crude product, and then pumping the washed material into a decompressing rectifying kettle; 4, decompressing rectification: indirectly heating through steam, keeping distillate temperature as 120 to 130 DEG C, controlling tower temperature as 68 to 80 DEG C and receiving a rectified component into a stainless steel finished product tank when the rectified component is the o-benzenedicarboxylic acid diallyl ester stably.
