Acetals solvent

One report (13) describes the procedure for spinning dry asymmetric ceUulose acetate fiber with a bore skin. Such fibers are spun in a modified dry-spinning process in which a volatile Uquid (methyl formate) is used as the ceUulose acetate solvent. The bore coagulating Uquid is isopropyl alcohol, which is subsequentiy removed. The advantages of these dry fibers over most ceUulose acetate membranes are that they can be stored dry, they are wet-dry reversible, they can be sterilized and packed dry, and they are ready for use without removal of preservatives. 

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-... 

About 50% of isopropanol use is to produce acetone. Other important synthetic uses are to produce esters of many acids, such as acetic (isopropyl acetate, solvent for cellulose nitrate), myristic, and oleic acids (used in lipsticks and lubricants). Isopropylpalmitate is used as an emulsifier for cosmetic materials. Isopropyl alcohol is a solvent for alkaloids, essential oils, and cellulose derivatives. 

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. 

Synonyms Acetic acid, 2-ethoxyethyl ester AI3-01955 BRN 1748677 CCRIS 3286 Cello-solve acetate CSAC EGEEA EINECS 203-839-2 Ekasolve EE acetate solvent Ethoxy-acetate 2-Ethoxyethanol acetate Ethoxyethyl acetate P-Ethoxyethyl acetate 2-Ethoxyethyl ethanoate Ethylene glycol ethyl ether acetate Ethylene glycol monoethyl ether acetate Glycol ether EE acetate Glycol monoethyl ether acetate NSC 8658 Oxitol acetate Oxytol acetate Polysolv EE acetate UN 1172. 

Uses Fumigant and larvacide for tobacco, cereals, dried fruits cellulose acetate solvent military poison gases intermediate in manufacture of pharmaceuticals, hydrocyanic acid, N,N-dimethylformamide organic synthesis. 

Solvent was anhydrous THF. 100% excess of the salt of the psuedo acid used (no sodium acetate). Solvent was ferf-butanol. Equivalent amounts of reactants and sodium acetate used unless otherwise stated. Reactions conducted in aqueous methanol unless otherwise stated. 

Poten dome trie detn of NGu) (Acet solvent with Et4- or Bu4NOH as titrant)] 12) G.F. Atknin et al, ZavodskLab 32(7), 802—4(1966)... 

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

The highly selective biocatalytic reactions afford a substantial reduction in waste. The overall isolated yield is greater than 90%, and the product is more than 98% chemically pure with an enantiomeric excess of >99.9%. All three evolved enzymes are highly active and are used at such low loadings that counter-current extraction can be used to minimize solvent volumes. Moreover, the butyl acetate solvent is recycled with an efficiency of 85%.The E factor (kgs waste per kg product) for the overall process is 5.8 if process water is excluded (2.3 for the reduction and 3.5 for the cyanation) [47]. If process water is included, the E factor for the whole process is 18 (6.6 for the reduction and 11.4 for the cyanation). The main contributors to the E factor are solvent losses which accounted for 51% of the waste, sodium gluconate (25%), NaCl and Na2SO4 (combined circa. 22%). The three enzymes and the NADP cofactor account for <1% of the waste. The main waste streams are aqueous and directly biodegradable. 

South Pasadena, Calif. [This apparatus is described in the jAmerOpticalSoc 31, 638(1941)] Then the optical density of soln at a wave length of 410 millimicrons is determined and a similar cell filled with 2055 Aiiim acetate solvent is tested to be a reference. Since the cell holding the soln of sample is not identical with that holding the solvent alone, it is required to introduce an optical correction. For this purpose, the cell contg the soln of sample is emptied and filled with solvent alone. 

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. 

Acetal is a poor solvent for NC but its admixture with anhydrous alcohoI(see Acetal Solvent) greatly increases its solvent power (Ref 8)... 

Acetal Solvent consists of a mixt of acetal and abs ale. The 90% mixt has d 0.82, boiling range 75—85° and fl p 38°. Acetal solvent gelatinizes NC much better than straight acetal and also dissolves many resins... 

Figure 10.9 HPLC trace of standard pigments using gradient elution system, (a) standard mixture (1) monitored at 415 nm (b) standard mixture (2) monitored at 490 nm and 590 nm. Conditions column 5 pm ( IS 150 X 4.6 mm, using diode array detection at 450 nm and gradient elution solvent A = 0.02 M ammonium acetate, Solvent B = acetonitrile gradient profile 0 min 95% A, 20 min 50% A, 25 min 95% A flow rate 1.0 ml/min.

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)... 

Batch and Semibatch Polymerization. The reactor is normally operated in a semicontinuous mode by delaying vinyl acetate, solvent, and initiator. The same reactor can be used for stripping the poly(vinyl acetate) solution, provided that careful addition of methanol is used in order to prevent the viscosity in the reactor from becoming excessive (249). The disadvantages of batch polymerization are lack of product consistency and unsatisfactory economics in large scale production (250,251). The true batch reaction, where all the reactants are added to the reactor at time zero, yields a product having a very broad molecular weight distribution of limited commercial value. 

Organic synthesis, cellulose acetate solvent, fumigant, larvicides, food additive. 

Information on differences in basicity of 4-azaazulenones was obtained from NMR spectra in CDC13 and trifluoroacetic acid (TFA). An alteration of the average shift of ring protons on going to the acetic solvent (see Table III) was thought to reflect differences in basicity. Thus, the order 5 > 7 8 > 6 has been established (86MI1). 

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