METHOD FOR STABILIZING HALOGENATED PARAFFINS Russian patent published in 2005 - IPC

FIELD: chemical technology.

SUBSTANCE: invention relates to technology manufacturing halide-substituted hydrocarbons, in particular, to stabilization of halogenated paraffins that are used as plasticizers, antipyrenes and special additives for polymeric materials and rubber mixtures, and in leather industry and in manufacturing depressants and lubricants also. Method is carried out by addition of stabilizing system comprising epoxy-compound and chelate compound forming chelate with iron ions. Stabilizing system comprises additionally acceptor of hydrogen chloride as a stabilizing agent that represents aliphatic carboxylic acid ketene comprising carbon number in chain in the ranges (C₁₀-C₂₃) and alkaline-earth metal of the 2-d group of periodic system in the following ratio of components as measured for the parent halogenated paraffin, wt.-%: chelate compound, 0.03-0.50; acceptor of hydrogen chloride as a stabilizing agent, 0.05-0.30; epoxy-compound, 0.20-0.80. Addition of indicated components of stabilizing system to halogenated paraffin is carried out simultaneously or successively at temperature in the ranges 40-90^oC. Stabilizing system can comprise additionally also antioxidant - a stabilizing agent of phenol type representing sterically hindered di- or trialkylphenol or its derivative, or their mixtures taken in the mount 0.01-0.15 wt.-%. Addition of indicated antioxidant - stabilizing agent is carried out before blowing or steaming acid mixtures at temperature in the ranges 40-90^oC in common or separately with chelate compound. Halogenated paraffin represents chlorinated paraffin with mass part of chlorine in the ranges 12-75%. Invention provides enhancing quality of stabilized halogenated paraffins by indices "color index" and "mass part of acids", reducing consumption norm of epoxy-compound.

EFFECT: improved stabilizing method.

8 cl, 1 tbl, 16 ex