SUSPENSION POLYVINYLCHLORIDE AND CAUSTIC SODA Production

SUSPENSION POLYVINYLCHLORIDE AND CAUSTIC SODA Production

Vinylchloride production plant

Plant capacity: 300 000 tpa
Year of start-up:
1975
1996 – modernization
Design: company Uhde, Germany

Process technology description
Vinylchloride production comprises of units for crude EDC production by means of direct ethylene chlorination and oxidative ethylene chlorination where hydrogen chloride obtained at pyrolysis is used in reactors with catalyst fluid bed.
In the system of rectifying columns crude EDC is dehydrated and cleaned from “light” and “heavy” organochloride impurities. Rectified EDC obtained is subjected to high-temperature pyrolysis after which vinylchloride is isolated on rectification stage and EDC-recycle and hydrogen chloride are returned to the process. The process consists of two process lines of direct and oxi-chlorination, four pyrolysis furnaces and one process line for EDC and vinylchloride rectification.
Product:.vinylchloride monomer is used as a feedstock in S-PVC production.

Chlorine and caustic soda production unit

Plant capacity:
on chlorine – 182 thous. t.
on caustic soda – 206 thous. t.
Year of start-up – 2010.
Process and design developer: company Uhde, Germany.

Process technology of chlorine and caustic production by membrane method by Linde process consists of the following units :
 Salt unloading, treatment and storage.
 Brine preparation.
 Anolyte dechlorination.
 Chlorates dissolution.
 Sulphates removal.
 Electrolysis.
 Chlorine cooling and drying, sulphuric acid pre-concentration.
 Chlorine compression.
 Catholyte system.
 Caustic soda pre-concentration.
 Caustic soda storage, loading/unloading rack, caustic soda pumping house.
 Hydrogen compression and storage.
 Hydrochloric acid synthesis.
 Demineralized water preparation.
 Waste water neutralization.
 Waste gas dechlorination.
Principal products: caustic soda.

Suspension polyvinychloride production unit

Plant capacity: 300 000 tpa.
Year of start-up – 2011.
Process developer : Company Vinnolit, Germany.
Design: company Uhde, Germany.

Production process technology consists of the following units :
 Cold and hot demineralized water storage;
 Fresh and recovery vinylchloride (VCM) and (R-VCM) storage;
 Chemicals dissolving and preparation;
 Vinylchloride polymerization (two parallel lines with two reactors in each.
 Polyvinychloride suspension degassing (two parallel lines).
 Unreacted vinylchloride recovery.
 Polyvinychloride suspension centrifuging and drying (two parallel lines).
 Finished products storage and bagging.
 Waste water treatment
 Demineralized water production unit.
 Cooling tower with a pump house.
Principal products: suspension polyvinyl chloride.