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New technology of Inhibition for Styrene Polymerization (TISP)

TISP is a non-traditional technology applying Inhibitor, well soluble in hydrocarbons, not containing heavy metals, nitroaromatics and sulfur. TISP is based on the new principles of Inhibition.
TISP is protected in 14 countries of the world (US Patent N 5488192, PCT Application IB 94/00240, Patent Korea N 4882/96, Russia Application 93-037814).
TISP is used in the styrene and isoprene Industries. In order to avoid polymer formation since 1978 inhibitor has been used for the process of styrene distillation by ethylbenzene dehydrogenation and since 1982 for styrene distillation by methylphenylcarbinol dehydration (or by ethylbenzene hydroperoxide).
TISP means very low toxicity and easy handling.

The TISP characteristics are as follows:

  • High effectiveness for polymerization inhibition, which does not adversely affect the quality of styrene monomer product.
  • TISP enables to reduce tar content in the product in comparison with any other conventional inhibitors. Tar can be used as a fuel or for anticorrosion coatings production.
  • TISP does not cause any environmental pollution.
  • Inhibitor of TISP can be injected continuously in a closed system.
  • TISP components are low toxycal.
  • TISP inhibits polymerization in a vapor phase.
  • Thermal stability of inhibitor components is more than 250° C.
  • Inhibitor solubility in aromatic solvents is very high.
  • Inhibitor is insoluble in water.
  • TISP protects against equipment corrosion.

Comparison of TISP process characteristics against other styrene inhibitors
The most important properties TISP Sulfur Dinitrophenols
Prevention of polymer formation in columns EXCELLENT GOOD GOOD
Inhibition of polymerization in vapor phase EXCELLENT BAD BAD
Prevention against corrosion of equipment EXCELLENT BAD BAD
Elimination of inhibitor losses. Water condensate purity EXCELLENT GOOD GOOD
Easy to prepare and to feed EXCELLENT INTERMIDIATE INTERMIDIATE
Solubility In solvents EXCELLENT BAD GOOD
Toxicity EXCELLENT GOOD BAD

Toxic characteristics of styrene inhibitors
Inhibitor LD 50 orl/rat mg/kg Notes
TISP (40% solution in ethylbenzene) 3670 Vapor can irritate nose and throat. Liquid may cause slight skin Irritation. Ingestion lead to the nausea, headache, vomiting, and dizziness. 
di- and mono- nitrophenols 30-80 Affects metabolism, causes dermatitis, eczema, development of cataract, as well as common and local allergy.
sulphur nontoxic Under high concentrations cause lacrimatIon photophobia. Affects central nervous system.
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