Investigation of textural, physico-chemical characteristics catalyst obtained method for the synthesis of vinyl acetate

¹ Samarkand State University, University Boulevard, 15, Samarkand, 140104, Uzbekistan
² Bukhara State University, M. Iqbol Street, 11, Bukhara, 705018, Uzbekistan
³ Gulistan State Pedagogical Institute, Talabalar Street, 49, Gulistan, 120100, Uzbekistan
⁴ Asia International University, Street Gijduvan, 74, Bukhara, 200100, Uzbekistan

^* Corresponding author: nfayzullaev1972@gmail.com

Abstract

The article investigates the textural and physico-chemical characteristics of a catalyst obtained by the sol-gel method for the synthesis of vinyl acetate. The dispersed properties of a catalyst with high catalytic activity selected for the catalytic vinylation of acetic acid in the presence of acetylene were studied using a scanning electron microscope (JSM-6510 LV). The main adsorption and structural characteristics of the load - specific surface area, pore volume and effective size - were obtained as a result of the work and determination of the isotherm of water vapor adsorption. From the adsorption measurement, the sample was treated in vacuum at 300° C for 8–10 hours. Adsorption was measured at room temperature. The adsorption balance was set for 22 hours. The relative error was 3%. The sum of the adsorption volumes of the pores ( ) was determined at P/P0=0.99 for nitrogen with a detection error of 6%. The synthesis products were analyzed by gas-liquid chromatography with a flame ionization detector under the following normal conditions: 15% lestosil in Light chrome −545 with a particle size of a fixed liquid phase of 0.250–0.315 Nm, a glass column measuring 2×0.004 m, column temperature 100° C, flow rate of gaseous nitrogen carrier 30 ml/min. Qualitative analysis was carried out by the method of “witnesses”, quantitative -by the method of internal normalization. To carry out the reaction of catalytic vinylation of acetic acid in the presence of acetylene, the total pore volume of the catalyst made on the basis of zeolites with a high silicon content is 0.3–0.41 cm3/g, the specific surface area is 50–170 m2/g.