Methyl acetate properties

Solvent X Methyl acetate Properties of solvent pairs UNIFAC contributions 339 CH3 1 CH3COO 1... 

Acetic acid, dehydro- — see also Pyran-2-one, 3-acetyl-4-hydroxy-6-methyl-fungicidal properties, 3, 883 H NMR, 3, 581 reactions, 3, 690 with amines, 3, 700 reduction, 3, 843 synthesis, 2, 90 tautomerism, 3, 643... 

The transformed variables describe the system composition with or without reaction and sum to unity as do Xi and yi. The condition for azeotropy becomes X, = Y,. Barbosa and Doherty have shown that phase and distillation diagrams constructed using the transformed composition coordinates have the same properties as phase and distillation region diagrams for nonreactive systems and similarly can be used to assist in design feasibility and operability studies [Chem Eng Sci, 43, 529, 1523, and 2377 (1988a,b,c)]. A residue curve map in transformed coordinates for the reactive system methanol-acetic acid-methyl acetate-water is shown in Fig. 13-76. Note that the nonreactive azeotrope between water and methyl acetate has disappeared, while the methyl acetate-methanol azeotrope remains intact. Only... 

One way to investigate the electrophilic properties of these molecules is to examine the orbital that each uses to accept electrons from a nucleophile. This orbital is the lowest-unoccupied molecular orbital (LUMO). Examine the LUMO for methyl acetate (Z=OCH3), acetaldehyde (Z=H), N,N-dimethylacetamide (Z=N(CH3)2) and acetyl chloride (Z=C1) (acetaldehyde is not a carboxylic acid derivative, but is included here for comparison). What is the shape of the LUMO in the region of the carbonyl group Is it a o or 7U orbital Is it bonding or antibonding What other atoms contribute to the LUMO Which bonds, if any, would be weakened when a nucleophile transfers its electrons into the LUMO ... 

Structure of luciferin (Ohtsuka et al., 1976). The luciferin of Diplocardia longa is a colorless liquid, and fairly stable at room temperature. It is soluble in polar organic solvents (methanol, ethanol, acetone, and methyl acetate) but insoluble in nonpolar solvents like hexane and carbon tetrachloride. Based on the chemical properties and spectroscopic data, the following chemical structure was assigned to the luciferin. 

For example, with the Co-I-PPh catalyst, methyl acetate reacts with synthesis gas to form ethyl acetate. All of the primary and secondary alcohols tested (C thru C ) decompose during long-term operation. The major decomposition products include aldehydes, alkyl iodides, and ethers. Ketones are readily hydrogenated and the resulting alcohols decompose. Good solvents in terms of stability are diphenyl ether and alkanes. The acetaldehyde rate is somewhat low (1.8 M/hr) in diphenyl ether, and the selectivity is low in alkanes. In addition, these solvents do not have good solubility properties, especially in product refining. 

The cntical properties of methyl acetate and ethyl acetate have been reported in the literature.Estimation methods were used to calculate the critical properties or butyl and vinyl acetate.1 The probable error is d C on the critical temperature. 15-25 psi on the critical pressure, and U.002 grams-milliliter on (he critical density. 

The applicability of the RD process is highly dependent on the properties of the chemical system at hand. A classical example for which RD is recommended may be the reaction in which the products are generated by a reversible reaction, e.g., in the production of methyl acetate. This system is very complex because of the occurrence of several azeotropes between reactants and products. 

AU% and ASy can be obtained (p. 214). Baliga and Whalley (1967) suggest that these quantities are more fundamental and that minima in 6m AH are a consequence of the dependence on x2 of the thermal expansivity, a, of the solvent mixture [eqn (5)]. Thus for the acid catalysed hydrolysis of methyl acetate in acetone + water mixtures, a minimum in 8mAH is observed but not in 8mAU (Whalley, 1966). However, the task of determining the properties of... 

Carbonylation of organic substrates was investigated using these well defined complexes. These carbonyl compounds exhibited catalytic properties in the carbonylation of organic substrates. In particular methanol carbonylation to methyl acetate in the gas phase was successfully attempted. Mechanistic and kinetic studies of this reaction over rhodium and iridium zeolites showed the similarities between the homogeneous and the zeolite mediated reactions. Aromatic ni-tro compounds were also converted to aromatic isocyanates using similar catalytic systems. The mechanistic aspect of this reaction will be also examined. 

Kubota, K. Abbey, K. M. Chu, B., "Static and Dynamical Properties of a Polymer Solution with Upper and Lower Critical Solution Points. NBS 705 Polystyrene in Methyl Acetate," Macromolecules, 16, 137 (1983). 

Ethers, esters, and ketones are molecules containing carbon, hydrogen, and oxygen atoms. Ethers are colorless and have a sweet odor. Some ethers have anesthetic properties and are used medicinally. Enflurane, isoflurane, and sevoflurane are all ethers that are used clinically as anesthetics. Esters include ethyl and methyl acetate. They are used in various adhesives, gums, resins, waxes, and oils. Ketones are very effective solvents for fats, resins, and lacquers. Examples are acetone (the solvent in nail polish and nail polish remover) and methyl butyl ketone (widely used in paint thinners). 

If methanol and acetic acid are available as raw materials and methyl acetate is the desired product, according to the property-difference hierarchy, an identity difference is first detected between the desired product and each of the raw materials. A known chemical reaction operator, namely the esterification reaction, can be applied to a mixture of the raw materials brought to the proper conditions to produce methyl acetate and eliminate the identity difference between the reaction effluent and the desired product. Thinking directly in terms of equipment, this operator may be immediately implemented, for example, as a stirred tank reactor. 

If the hierarchical means-ends analysis synthesis procedure is applied to the methyl acetate problem, the task identification, task integration, and equipment design stages are kept completely separate. Following the property-difference hierarchy, an identity-changing reaction task (Task A) is identified first, as before. When examining the differences between the result of this reaction task application and the product methyl acetate and by-product water destinations,... 

Properties Molecular weight 2000-5000. Translucent white solids, excellent electrical resistance, abrasion resistant, resistant to water and most chemicals, d 0.92. Slightly soluble in turpentine, petroleum naphtha, xylene, and toluene at room temperature soluble in xylene, toluene, trichloroethylene, turpentine, and mineral oils at 82.2C practically insoluble in water slightly soluble in methyl acetate, acetone, and ethanol up to the boiling points of these solvents. Available as emulsified and nonem-ulsified forms. Combustible. 

E and Z isomers of esters can display significantly different properties such as acidity, as observed in the case of methyl acetate the E isomer has been calculated to be more acidic than the Z form [6], and this theoretical result has been related to the unusually low pKa of Meldrum s acid (pKa = 7.3 to be compared to dimethyl malonate pKa = 15.9) [7,8], In contrast, the Z E ratio of methyl thio-noformate (HCOSMe) is 97 3 in acetone (AG° = 1.29 kcal mol-1) in the 177-192 K range, whereas the ratio is 77 29 for cyclopropyl thionoformate in the same conditions (AG° = 0.31 kcal mol-1). The energy difference is even dose to zero (AG° = 0.13 kcal mol-1) in the particular case of phenyl thioformate [9]. 

Coextrusion of L-lactide (a cyclic dimer lactone of lactic acid) with hydroxy-terminated poly(caprolactone) in the presence of stannous octoate gave a block copolymer.74 Block copolymers can also be used as compatibilizers for the homopolymers, in addition to having interesting properties in their own right.75 Copolymers of ethylene and vinyl acetate can be treated with methanol and a little sodium methoxide to remove some of the acetate groups from the copolymer.76 The by-product methyl acetate comes out the vent of the extruder. n-Butyl alcohol can be used in the same way.77 The product copolymer is useful as a gas barrier coating on films for packaging food. 

Methyl acetate (CAS 79-20-9) Vapors moderately irritating to the eyes and respiratory tract. A CNS depressant at high levels. Hydrolyzed to methanol in the body with possible oonsequent toxioity similar to that of methanol (see p 250). 200 ppm 3100 ppm [LEL] 1 3 0 Colorless liquid with a pleasant, fmity odor that is a good warning property. Vapor pressure is 173 mm Hg at 20°C (68°F). Flammable. 

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