Catalytic synthesis of triazine compounds using a flexible technology

Based on laboratory pilot studies, we have developed a flow sheet for the catalytic synthesis of triazine compounds from carbamide using a flexible technology and a catalyst for this process. The main process parameters are as follows: a carbamide melt is fed into the reactor under a pressure of 0.8 MPa at 140–160°C; the volume rate of feeding the circulating gas into the reactor is 500–750 h⁻¹, its temperature is 350–500°C, and the melt-to-gas mass ratio is 1: (7–9). The temperature of synthesis in the reactor is 350–450°C; the pressure in the reactor is 0.1–0.2 MPa. The sublimation temperature is 180–200°C. The conversion of carbamide is ∼98%. The content of the target component in the product is ∼98.8%. Depending on the composition of the circulating gas, it is possible to obtain products of melamine, cyanuric acid, or melamine cyanurate. A catalyst in the form of promoted active aluminum oxide with an inner surface of 300 to 400 m²/g and a technique for its preparation have been developed.     

Formulation of an indirect query processing method for a database computer

Translated from Kibernetika, No. 6, pp. 15–22, November–December, 1988.     

Modernization of a sulfuric acid alkylation unit

One of the basic processes in production of the components of high-octane unleaded gasolines which satisfy contemporary environmental requirements is sulfuric acid alkylation of isobutane by butylenes. Increasing output and improving the quality of alkylate gasoline are greatly determined by the level of the technology and instrumentation of this process. Translated fromKhimiya i Tekhnologiya Topliv i Masel, No. 1, pp. 21–22, January – February, 2000.