The Research Of Acetate-Acrylic Quaternary System Thermodynamics And Separation And A Method For Preparing Methyl Acrylate

Acrylic acid and its esters are important chemical raw materials. Their polymers are widely used in textiles, adhesives, coatings, chemical fiber. They can also be used in the manufacture of superabsorbent, heat oil rubber and activators. They have important applications in various fields of building materials, leather, paper, plastic, hygiene products, detergents, water treatment and oil exploitation. In this paper, Methyl acetate-Methyl acrylate-Acetic acid-Acrylic acid vapor-liquid equilibrium measuring system, vacuum distillation separation and methyl acrylate catalyzed esterification reaction were studied.For vapor-liquid equilibrium, binary vapor-liquid equilibrium data of methyl acetate-methyl acrylate-acetic acid -acrylic acid were measured under an atmospheric pressure using cyclic steam liquid balancer. Several of binary vapor-liquid equilibrium data were correlated by using NRTL activity coefficient model. The vapor-liquid equilibrium data for the binary system were predicted by using binary interaction. The results coincided with the experimental value.In the vacuum distillation separation, the separation of the quaternary system was designed and optimized through Aspen Plus simulation software, and high pure methyl acrylate products were achieved under simulated conditions, which proved the feasibility of the optimized conditions.In the catalytic reaction of methyl acrylate, the condensation reaction about the methyl acrylate and formaldehyde catalyzed aldol to produce methyl acrylate was done using the slurry bed reactor. By changing the formaldehyde source, catalyst type, reaction pressure, reaction temperature and reaction time, and ultimately to the source of trioxane to formaldehyde, sodium methoxide as the catalyst at 260?,4 MPa reaction conditions 5 h, a solution containing product of methyl acrylate is obtained.