Solvents ethyl acetate

Although this process has not been commercialized, Daicel operated a 12,000-t/yr propylene oxide plant based on a peracetic acid [79-21-0] process during the 1970s. The Daicel process involved metal ion-catalyzed air oxidation of acetaldehyde in ethyl acetate solvent resulting in a 30% peracetic acid solution in ethyl acetate. Epoxidation of propylene followed by purification gives propylene oxide and acetic acid as products (197). As of this writing (ca 1995), this process is not in operation. 

The crude product (48.4 grams, 80.9% yield) was recrystallized from an absolute ethanol-ethyl acetate solvent system by suspending the salt in boiling anhydrous ethyl acetate and just enough absolute ethanol was gradually added to effect solution after which the solu-... 

One of the most dramatic examples of a solvent effect on propagation taken from the early literature is for vinyl acetate polymerization.78,79 Kamachi el al.n reported a ca. 80-fold reduction in kp (30aC) on shifting from ethyl acetate to benzonilrile solvent (Table 8.1). Effects on polymer structure were also reported. Hatada ef a m conducted a H NMR study on the structure of the PVAc formed in various solvents. They found that PVAc (M n 20000) produced in ethyl acetate solvent has 0.7 branches/chain while that formed in aromatic solvents is essentially unbranched. 

It is well known that palladium on carbon catalysts are poisoned by hydrogen cyanide and thiol products or hydrogen sulfide (6). Therefore, it was of interest to investigate the reduction of perfluoroalkyl thiocyanates as a function of tin concentration, keeping the concentration of palladium and reaction conditions constant. Figure 15.1 delineates the % conversion vs. Sn/Pd ratio, under the same reaction conditions of 175°C, 700 psig H2 for 2 hours with 5% Pd on carbon catalysts in ethyl acetate solvent at a 1000 1 substrate catalyst molar ratio. The increase in... 

Reaction conditions ethyl acetate solvent 363 K TBHP/FAME molar ratio = 1.33 FAME/catalyst molar ratio = 160. a) Selectivity to monoepoxides. 

The concentration of acrylic acid by extraction with ethyl acetate is a rather different illustration of this technique. As shown in Figure 13.4, the dilute acrylic acid solution of concentration about 20 per cent is fed to the top of the extraction column 1, the ethyl acetate solvent being fed in at the base. The acetate containing the dissolved acrylic acid and water leaves from the top and is fed to the distillation column 2, where the acetate is removed as an azeotrope with water and the dry acrylic acid is recovered as product from the bottom. 

Ethyl acetate Solvent-like, nail polish 17.6 7.5 4-800... 

Quenching rates kQM were determined431 utilizing CCU for the homopolymers of benzyl, 2-phenylethyl, and 3-phenylpropyl methacrylate. Similarly, kQM were measured for copolymers of methyl methacrylate containing <10% of each of the aromatic monomers. When kQM of the homopolymers given above are divided by kQM of the matching copolymer, the values 0.95, 1.13, and 1.81, respectively, are obtained for dichloromethane solvent. Values of the same quantity determined in ethyl acetate solvent are 1.38, 1.09, and 1.83, with respect to the phenylalkyl units listed above. 

The crude product (48.4 grams, 80.9% yield) was recrystallized from an absolute ethanol-ethyl acetate solvent system by suspending the salt in boiling anhydrous ethyl acetate and just enough absolute ethanol was gradually added to effect solution after which the solution was concentrated to about two-thirds of the original volume on the steam bath, charcoal treated, and suction-filtered through Celite filter aid. The white crystals of 2-dimethylaminoethanol p-acetylaminobenzoate obtained, dried at room temperature at a pressure of 0.08 mm Hg for 15 hours, melted at 159.0°-161.5°C. 

Figure 2. Isothermal polymerization of methyl methacrylate in a CSTR (1 5). a. Predicted steady-state monomer conversion vs. reactor residence time for the solution polymerization of MMA in ethyl acetate at 86 °C. h. Steady-state and dynamic experiments for the isothermal solution polymerization of MMA in ethyl acetate (solvent fraction O.k) ( ) steady states,...

Chlorinated isocyanurate compound in ethyl acetate solvent (for rubbers, especially thermoplastic styrene-butadiene-styrene rubbers)... 

The key problems in a polymerization CSTR are the determination and characterization of micro- and macromixing, and the possibility of multiple steady states due to the exothermic nature of the reactions. Recent studies of CSTRs for bulk or solution free-radical polymerization indicate the possibility of multiple steady states due to the large heat evolution and difficult heat transfer that are characteristic of the reactors. Furthermore, even in simple solution polymerization (for example, in methyl methacrylate polymerization in ethyl acetate solvent), autocatalytic kinetics can lead to runaway conditions even with perfect temperature control for certain combinations of solvent concentration and reactor residence time. In practice, the heat evolution can be an additional source of autocatalytic behavior. 

Esters (solvents) n-Butyl acetate, wo-butyl acetate, ethyl acetate, l-butanol-3-methoxy acetate, l-ethoxy-2-propyl acetate, 1- methoxy-2-propyl acetate, Texanol, TXIB, 2- (2-butoxyethoxy)-ethyl acetate Solvent-based systems... 

V) Reaction with triphenylphosphine (54) and crystallization of 79 by dichloromethane ethyl acetate solvent exchange. 

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