SU743986A1 - Method of stabilizing lowest aliphatic chlorohydrocarbons - Google Patents

Description

The present invention relates to a method for stabilizing lower aliphatic chloro-orbicides, which are widely used as solvents, are used for removing varnishes, degreasing parts, etc. When they are separated by rectification methods, chlorohydrocarbons are dispersed to form resinous substances, which leads to the entanglement of column boilers and requires their purification. Moreover, resinous products stain the chlorohydrocarbon. Hydrogen chloride released during the decomposition of the chlorohydrocarbon of the genera causes corrosion of the equipment. There is a known method of stabilizing lower aliphatic hydrocarbons from decomposition by introducing amines in a mixture with epoxy compounds 1. The stabilizing effect is thus low. The closest to the proposed method to the technical essence and the achieved result is a method of stabilizing lower aliphatic chlorohydrocarbons from decomposition by introducing phosphites of the general formula ("0") R, where R is Cd-Cc-alkyl, C, -Arkl, alkaryl 2 However, the known method of stabilization by phosphites does not effectively prevent resin formation when chlorine hydrocarbons are released. The purpose of the invention is to reduce resin formation. The goal is achieved by the proposed method of stabilization, which is that the phosphites of the formula (UO) sP / (1) where R is Cg, -Cg-alkyl, C-C-aryl, Cp-C, g-Alkaryl, are introduced into the lower aliphatic chlorohydrocarbons together with acidic phosphations of the formula (RO) 2Pfy where R is lower alknp, phenyl, higher alkphenyl C, 2-C (, with a weight ratio of 4-19: 1 and concentration of stabilizing agent 0.1 - 5 mass./from .leca of the method is the use of the additionally indicated acidic phosphite at y /: forfeit weight ratio a and an acidic phosphite. The use of complete phosphites in a mixture with acidic phosphites can significantly reduce gum formation while isolating lower aliphatic chlorohydrocarbons by means of rectification. This in turn reduces the degree of coloration of chlorohydrocarbons. As the object of study, 1, 2, 3-trichloroprotin was selected from saturated hydrocarbons, and chlorine ethylene and 4-chloropenthene tetras74 were selected from unsaturated hydrocarbons. - 2. Ll accelerate testing and bringing them closer to real conditions in chlorine hydrocarbons in all explosives, ferric chloride is introduced in an amount of 0.05 wt.%. The experiments were carried out by boiling 50 ml of freshly dried chlorohydrocarbon in the presence of ferric chloride and a stabilizing agent. The effectiveness of stabilization is assessed by the amount of resin formed during the thermal aging of the llorohydrocarbon and by the change in its color. The amount of resinous substances is determined by the gravimetric method. In tab. 1 presents the results of laboratory tests for the stabilization of 1, 2, 3-trichloropropane ..

The results of thermal exposure of 1,2,3-grichloropropane at a temperature of 157 ° C for 50 h

(C4H, 0) zR

0.1

(Sbi50) sr

0.5 (C4H, 0) zP (C4H90) jP ;;

0

0.5

0.02J

(С4НЧО) ЗР

0.8

,

() rR

(Sbi50) sr

..ABOUT

(CftHjOtjP

n

Table 1

3.0J

Yellow

1.87

Also

Also

1.26

40

0,69

80

0.21 Light o-yellow and

K ", O) s 1

7. O b: (s) rR 0.1 P p i m e c h a n

The results of thermal exposure of tetrachloretapene at a temperature of 120 ° C for 10 h.

(C4H, 0) zR

6

ABOUT

four

(C4H90) jP ;;

() sr

-, 0

(C4H, 0) 2 P (

80

1.23

20

table 2

0.49

80

Also

0.8 0.16 I20

0.24

80

6.0

20 e: x) 1, 2, 3-Trichloropropane before exposure without added ferric chloride — colorless. vx) Ferric chloride was introduced in all experiments.

Claims (1)

Claim The method of stabilization of lower aliphatic chlorohydrocarbons from decomposition by introducing a stabilizing agent based on the general formula (BO) ₃ R. where R is CyCg-alkyl, C-C _{) 0} -aryl, C ^ -C ^ -alkaryl, characterized in that, in order to reduce gumming, use a stabilizing agent containing additional acid phosphite. L> where B is lower alkyl, phenyl, higher alkhenyl C ₁₂ -C _{) 6} , with a weight ratio of phosphite and acid phosphite of 4-19: 1 and a concentration of a stabilizing agent of 0.1-5 wt.% of ⁵⁰ weight of chlorohydrocarbon.