SU235015A1 - Method for inhibiting polymerization of isoprene - Google Patents

Abstract

METHOD OF INHIBITING POLY-

Description

ISD

with cd; . , -,., .. There is a known method of inhibiting the polymerization of isoprene by introducing a wood resin antipolymer as an inhibitor into it. The proposed method is characterized by the use of a new phenolic compound, o -nithophenol, which is significantly superior in its qualities to a wood resin antipolymer. This allows the assortment of inhibitors to be expanded. Thus, isoprene in the presence of wood resin antipolymerization polymerizes to a viscous-flowing state during the treatment at IO ° C after 100 h, and in the presence of nitrophenol after 600 h, the mass has a dimer viscosity. The optimum amount of o-nitrophenol recommended for inhibiting the isoprene is 0.1-0.5 wt.%. Comparative data on the inhibitory effect of wood resin antipolyperisate and o-nitrophenol are given in the table. In all cases, in the presence of o-nitrophenol, no polymer is contained in the cube, and in the presence of wood resin antipolymerisate, the vat residue is a viscous mass.

76.4

64.2

50, 1

45.9

37,6

34.3

12.1

Polymer

Also

O-Nitrophenol is highly soluble in isoprene, while the wood resin antipolymerization does not dissolve in it. Solubility o-nit90

75, 70.9 67.3 54

44.3

40.3

10.5

2.0

1.0

rofenol provides a good inhibitory activity of it, not only during rectification, but also during storage of isoprene.

Claims (1)

- METHOD FOR INHIBITING POLYMERIZATION OF ISOPRENE by introducing phenolic compounds as inhibitors, characterized in that, in order to expand the range of inhibitors, 0-nitrophenol is used as the latter. .. •. • ... • ‘. ••• - •• l- '' '·’ ή u ·· ..... .4. ··: .ν ** ··· “* ·