THE IMPROVEMENT OF THE TECHNOLOGICAL SCHEME OF PRODUCTION OF STABILIZED AND PROCESSED CATALYST OF THE MEDIUM-TEMPERATURE CONVERSION OF OXIDE CARBON

Abstract

The article deals with the possibility of reducing the environmental burden on the environment, for example, by introducing changes in the technological scheme for the production of a stabilized and reformed catalyst for the average temperature conversion of carbon monoxide by steam (STC) from the waste of titanium (IV) oxide production with a low mass fraction of sulfur. The rational conditions of processes of sedimentation, aging, washing and thermal decomposition are proposed, and it allows to reduce the cost price of the target product by eliminating from the technological process the desulfurization stage. The possibility of stabilizing the STK catalyst with hydroxide has been proved. It was determined that the use of samples with ω [Ca (OH) 2] ~ 0.75 mass. % completely eliminates the stage of their desulphurization, since the maximum concentration of H2S in the gas phase at the exit from the reactor was meager at an industrial scale of 0.04 mg / m3. The activity of the obtained samples of the catalyst STK for the constant of the rate of reaction of CO conversion with water vapor at 350 ° C, which averages 2.15 cm3 / (g ∙ s), corresponds to the current level of activity of existing catalysts STK. It has been established that the use of co-precipitation of all catalyst components differs favorably from the prevailing separation deposition. And with the addition of a flocculant based on [(-CH2CHCONH2-) n] polyacrylamide and a high molecular weight polyethylene oxide [(-OSH2CH2-) n], in comparison with the simple process of settling, the sedimentation rate increases 3 ÷ 6 times depending on the concentration of the flocculant. This solution allows to obtain a catalyst with increased activity and thermal stability. In this case, the use of chromium (III) sulphate instead of chrome (VI) oxide can facilitate and improve the efficiency of co-precipitation of catalyst components STK. It was established that the introduction of changes in the technological scheme of production, contributes to reducing energy costs and improving the state of environmental safety.