Sulfuric Acid Alkylation of Isobutane by Olefins. Experience in Operation of a Jet Mixing Reactor

Experience in operating a sulfuric–acid alkylation jet reactor of new design — with no mixers and heat–exchange bank and a process scheme that includes this reactor, a hydrocyclone, three–phase separator, and circulating centrifugal pumps are described. An additional quantity of feedstock is added to the jet reactor operating in tandem with a cascade reactor without addition of circulating isobutane. The concentration of high–octane components in the products of the reaction, i.e., the alkylate production volume, increases. The results of operating the jet reactor in incorporation of propylene feedstock from the cascade reactor to butylene alkylate are reported. The additional volume of propylene alkylate is up to 1/3 of the total output of the unit, distillation is improved, and the Motor Octane Number decreases insignificantly — by a maximum of 0.5 points.     

Every Superinterval of the Function Range Can Be an Interval-Computations Enclosure

Reliable Computing - How good an estimate can we get by applying "naive" interval computations technique to a given function f(x 1,...,x n ) over given intervals x1,...,x n ? This...     

System for automatic control of the temperature conditions in texturing of synthetic fibres

A design for a heater that allows realizing a system for control of heating of textured fibre using the contact time of the fibre with the heater as the controlling effect is proposed. The system for controlling the temperature conditions of heating the synthetic fibre during texturing is modeled and indicates the high efficiency of the proposed control method. Software was developed that provides for computer implementation of the temperature conditions control system. __________ Translated from Khimicheskie Volokna, No. 3, pp. 58–59, May–June, 2007.     

Dynamics of Heating of Fluoride Stock in Manufacture of Optical Fibres

Heating of fluoride stock was analyzed. A module for drawing fluoride stock into optical fibres was developed. The transient responses and transmitting functions of the object of control in “current strength—temperature” and “gas flow—temperature” channels were obtained. The structure of a system for controlling heating of fluoride stock was proposed based on the results of the study.__________Translated from Khimicheskie Volokna, No. 2, pp. 16–18, March–April, 2005.