Esterification of maleic acid with methanol

The method of solution is relatively simple for maleic acid esterification. To evaluate the exit concentration of maleic acid, methanol, monomethyl maleate, dimethyl maleate and water, the set of ordinary differential equations 5.29-5.34 were solved using Runge-Kutta method. The above models allow prediction of the concentration of reactants and products along the length of reactor. Thus at any given length of the reactor the fractional conversion of the acid can be calculated as 

When calculations are performed for z = 1, we get the conversion of acid at the exit of the reactor. 

---

Initial rate data for ion exchange resin catalyzed esterification of maleic acid with methanol 131... 

Esterification of Maleic acid with Methanol in the presence of Dowex SOW catalyst. 

Chapter 4 Esterification of Maleic Acid with Methanol in Presence of Dowex SOW as a catalyst. 

The liquid phase esterification of maleic acid with methanol in a batch slurry reactor was studied. The esterification of maleic acid is an example of a multistep catalytic reversible reaction. The first reaction involves formation of a monoester (monomethyl-meleate) which further reacts with methanol to form a di-ester (dimethyl-maleate). The reactions involved are ... 

Maleate esters such as dimethyl maleate, diethyl maleate and dibutyl maleate are extensively used in the production of latex emulsion polymers, thermoplastic and thermosetting plastics. Dimethyl maleate has found use in applications where improvement in hardness and toughness of polymer films are desired. This includes, in particular, the improvement of anti-blocking properties of copolymers of vinyl acetate with dimethyl maleate. It is also used as an internal modifier to increase the glass transition temperature of styrene or vinyl chloride polymer. The intermediate in esterification of maleic acid with methanol, monomethyl maleate provides plastsizing effect, as well as promotion of improved polymer adhesion due to the carboxylic group. It can be copolymerized with a variety of vinyl and acrylic monomers to provide coatings with improved stiffness and adhesion and reduced tackiness or tendency to block. Monoesters of maleates are used to provide carboxylic acid functionality in emulsions and water-soluble polymers. 

Fig. 5.3 Exit concentrations for esterification of maleic acid with methanol at 318 K...

In these experiments, the concentrations of reactants and products at the exit of the reactor were observed under steady state conditions for different liquid velocities and molar ratio of reactants in a temperature range of 298 - 363 K. Typical results are shown in Fig. 5.1 for acetic acid-methanol system. For acetic acid with butanol and maleic acid with methanol esterification the results are shown in Fig 5.2 and 5.3 respectively. From these data the conversion of acid as a function of liquid velocity was also evaluated for all the systems. For example, the acetic acid conversion obtained for esterification with methanol is presented in Fig. 5.4 and 5.5 for 318 and 328 K respectively. 

For esterification maleic acid with methanol the results are presented in Fig. 5.9 for different temperatures. The model predictions of the experimental data were found to be satisfactory. 

Conversion of maleic acid for esterification with methanol different temperatures 170... 

---