METHOD OF PRODUCTION OF OIL-HEAT- TRANSFER AGENT Russian patent published in 2003 - IPC

FIELD: petrochemical industry, production of the oil-heat-transfer agent. SUBSTANCE: petroleum fraction with interval boiling temperatures from 280 C up to 520 C is exposed to vacuum distillation under the temperature of 200-300 C and a residual pressure of 0.0013-0.0027 MPa up to productive rate of 60-80 % of the target faction. The target faction is chemically purified at 40-55 C with use of a complex of the catalyst (AlCl₃•C_nH_2n-6•HCl) under mass ratio of the faction: the complex as 1: 0.09-0.13 and under mass ratio of the components in the complex AlCl₃: aromatic hydrocarbon (C_nH_2n-6) : HCl 0.25-0.27 : 0.63-0.66 : 0.09-0,13. At that in the aromatic hydrocarbon n = 7 or 8, the fraction received after the chemical refining is exposed to the adsorptive treatment with use of the bleaching earth or discoloring clay and afterfiltration. EFFECT: decrease of materials and power inputs at production of the oil-heat-transfer agent with simultaneous observance of requirements to the ecological compatibility of the process and implementation of the requirements applied to the physico-chemical properties of the finished product, including for different systems of a heat supply. 8 cl, 4 tab, 2 ex