Methyl acetates, hydrolysis

Table 7 Methyl Acetate Hydrolysis with Untreated and Treated Carbon...

Popken, T., L. Gotze J. Gmehling (2000) Reaction kinetics and chemical equilibrium of homogeneously and heterogeneously catalyzed acetic acid esterification with methanol and methyl acetate hydrolysis. Industrial Engineering Chemistry Research, 39, 2601-2611,1SSN 0888-5885. 

Table 4.1 Experimental data for methyl acetate hydrolysis...

Fig. 4.1 To the rate constant calculation of methyl acetate hydrolysis in acidic media...

Note that the neat design is considered here instead of the excess reactant design often seen in methyl acetate hydrolysis. Because the tight product (LK component C) and heavy... 

Successive introduction of two methyl groups at ring carbon increases the hydrolysis rate by a factor of 10 in each step, indicating cation formation in the transition state as in acetal hydrolysis. Equilibrium protonation before hydrolysis becomes evident from an increasing rate of hydrolysis with a decreasing pH value (Table 3). Below pH 3 no further increase of rate is observed, so that protonation is assumed to be complete. 

Ion exchange resin heads used as column packing Hydrolysis of methyl acetate t lichigami, J. Chem. Eng. Jap., 23,. 354 (1990)... 

Slotted plate for catalyst support designed with openings for vapor flow Ion exchanger fibers (reinforced ion exchange polymer) used as solid-acid catalyst None specified Hydrolysis of methyl acetate Evans and Stark, Eiir. Pat. Appl. EP 571,163 (1993) Hirata et al., Jap. Patent 05,212,290 (1993)... 

An instance of autocatalysis is the hydrolysis of methyl acetate, which is catalyzed by product acetic acid, A C. The rate equation may be... 

A chemist is studying the mechanism of the following hydrolysis reaction of the organic ester methyl acetate CH.COOCI I, + H,0 - CH,COOH + CH,OH. The question arises whether the O atom in the product methanol comes from the methyl acetate or from the water. Propose an experiment using isotopes that would allow the chemist to determine the origin of the oxygen atom. 

Countercurrent flow has advantages in product and thermodynamically limited reactions. Catalytic packings (see Figure 9. Id) are commonly used in that mode of operation in catalytic distillation. Esterification (methyl acetate, ethyl acetate, and butyl acetate), acetalization, etherification (MTBE), and ester hydrolysis (methyl acetate) were implemented on an industrial scale. 

Scheme 5.14 One-pot cascade involving acid-catalyzed acetal hydrolysis followed by the addition of methyl vinyl ketone (MVK) in an amine-catalyzed Baylis-Hillman reaction. The acid and base used were synthesized as in Scheme 5.13 [30],...

Hydrolysis of methyl acetate or its reverse, esterification of acetic acid... 

The liquid-phase hydrolysis of methyl acetate (A) to acetic acid and methyl alcohol is a reversible reaction (with rate constants kf and k as in equation 5.3-3). Results of an experiment carried out at a particular (constant) temperature in a BR in terms of the fraction hydrolyzed (/A) measured at various times (t), with cAo = 0.05 mol L-1 (no products present initially), are as follows (Coulson et al, 1982, p. 616) ... 

An aqueous solution of methyl acetate (A) enters a CSTR at a rate of 0.5 L s 1 and a concentration (cAo) of 0.2 mol L-1. The tank is initially filled with 2000 L of water so that material flows out at a rate of 0.5 L s 1. A negligibly small stream of HCI (catalyst) is added to the entering solution of acetate so that the concentration of acid in the tank is maintained at 0.1 mol L-1, in which case the hydrolysis of acetate occurs at a rate characterized by kA = 1.1 I 10-4 s-1. What is the concentration of acetate in the outlet stream at the end of 30 min, and what is the eventual steady-state concentration ... 

Two configurations of stirred-tank reactors are to be considered for carrying out the reversible hydrolysis of methyl acetate (A) to produce methanol (B) and acetic acid (C) at a particular temperature. Determine which of the following configurations results in the greater steady-state rate of production of methanol ... 

The hydrolysis of methyl acetate (A) in dilute aqueous solution to form methanol (B) and acetic acid (C) is to take place in a batch reactor operating isothermally. The reaction is reversible, pseudo-first-order with respect to acetate in the forward direction (kf = 1.82 X 10-4 s-1), and first-order with respect to each product species in the reverse direction (kr = 4.49 X10-4 L mol-1 S l). The feed contains only A in water, at a concentration of 0.050 mol L-1. Determine the size of the reactor required, if the rate of product formation is to be 100 mol h-1 on a continuing basis, the down-time per batch is 30 min, and the optimal fractional conversion (i.e., that which maximizes production) is obtained in each cycle. 

The rate of hydrolysis of methyl acetate is reversible and proceeds according to the equation... 

Data for the acid hydrolysis of methyl acetate (A) at 25°C CH3C02CH3 + H20 = CH3COOH + CH3OH... 

The hydrolysis of methyl acetate (A) is catalyzed by the reaction product acetic acid (B). In one experiment, when the initial concentration of acetate was 0.5 and that of the acid was 0.05 gmol/liter, 60% conversion was attained in one hour. Find the time at which the reaction velocity became a maximum and the value of this maximum. 

It has been shown that the catalytic action of acids is proportional to their strength, of which their degree of ionisation is an expression. Conversely, the strength of an acid can be determined by measuring the rate of hydrolysis of an ester (usually methyl acetate) in aqueous solution in the presence of the acid concerned. 

A similar reaction, namely the hydrolysis of methyl acetate,... 

Nil Ratan Dhar, Coefficient de temperature de reactions catalytiques (Paris These d Universite, 1916) "Catalysis, Pt. IV, Temperature Coefficients of Catalysed Reactions," JCS.Trans. Ill (1917) 707762 and The Chemical Action of Light (London Blackie and Son, 1931). And Alfred Lamble and William C. McCullagh Lewis, "Studies in Catalysis, Pt. I, Hydrolysis of Methyl Acetate, with a Theory of Homogeneous Catalysis," JCS.Trans. 105 (1914) 23302342 and W. C. McCullagh Lewis, "Studies in Catalysis, Pt. VII, Heat of Reaction, Equilibrium Constant, and Allied Quantities, from the Point of View of the Radiation Hypothesis," JCS.Trans. Ill (1917) 457469. 

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