INFLUENCE OF CONSUMPTION OF ACIDIFYING AND COAGULATING AGENTS ON THE PROCESS OF SEPARATING RUBBER FROM LATEX

The presented work is devoted to improving the stage of separating crumbs of emulsion styrene-butadiene synthetic rubber. A comprehensive assessment of the influence of the consumption of the high-molecular cationic reagent VPK-10, the acidifying component and temperature on the process of reducing the aggregative stability of latex dispersion was carried out. The work investigated the effect of the amount of introduced sulfuric acid on the yield of released rubber at temperatures of 0, 20 or 60 °C. Anomalous behavior of the process was discovered when studying the effect of coagulation temperature on rubber yield depending on the amount of added acid. When introducing sulfuric acid in an amount of 15 kg/t of rubber, an increase in temperature required an increase in the amount of added coagulant to achieve complete recovery of rubber. Reducing the amount of sulfuric acid to 10 kg/t of rubber required an increase in the required amount of coagulant. At the same time, the increase in temperature also required an increase in the amount of added coagulant for maximum effect in releasing rubber. A distinctive feature when reducing the dosage of sulfuric acid to 5 kg/t of rubber was the reverse effect of the temperature of the coagulation process. The highest coagulant consumption was achieved not at 1 °C, but at 60 °C. At the same time, the amount of coagulant required for maximum extraction of rubber crumbs from latex decreased with increasing temperature. The change in the temperature regime of the process of separating rubber from latex with a decrease in the acidity of the coagulated system is possibly due to the fact that with a lack of sulfuric acid, incomplete conversion of latex carboxylic acid soaps into carboxylic acids occurs. Therefore, there is no significant destabilization of latex globules and the protective layer based on an anionic surfactant does not undergo global destruction. For citation: Pisareva I.A., Nikulina N.S., Sannikova N.Yu., Misin V.M., Vlasova L.A., Nikulin S.S. Influence of consumption of acidifying and coagulating agents on the process of separating rubber from latex. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2024. V. 67. N 11. P. 114-121. DOI: 10.6060/ivkkt.20246711.7048.