PVC-EN
Producing PVC is one of the major goals behind setting up Arvand Petrochemical Complex. It is desingned to produce 300,000 tons per annum of S-PVC and 40,000 tons per annum of E-PVC for local consumption. The excess produce will be exported to international markets. The plant produces eight different grades of S-PVC powder and five different grades of E-PVC powder. The S-PVC and E-PVC Units consist of the following sections

VCM &Dematerializad Water Supply

Dissolving & Catalysts-Production

Polymerization

Degassing

Drying & Bagging

The VCM produced at the EDC/VCM Plant is the major feedstock of the PVC Plant. The modern Vinnolittechnology is employed for the production of PVC which has improved the quality and the efficiency of the plant output.

At the S-PVC plant, the VCM feedstock from the EDC/VCM Unit is dehydrated and sent to polymerization section which consists of six batch reactors.They use Intercooler technology that helps minimize production cost and improve the efficiency of this section.

In the polymerization unit of the S-PVC Plant, PVC is producedsuspension method within the polymerization reactors. Meanwhile,in addition to the VCM feed, a number of chemicals such as catalysts,dispersants are injected in to reactors along with VCM.

The out coming suspension from reactors, enters dehydrators after passing through degassing columns. It is dehydrated by centrifuges and is conveyed to dryers.

The suspension produced in the reactors is dehydrated withincentrifuges. The product is dried by hot air from dryers.

The final PVC powder product is conveyed to bagging section.

The bagged product is stored at the plant’s warehouses.

In the E-PVC Plant,much of the production process resembles that of the S-PVC Plant. The polymerization process takes place ina continuous form.

The polymerization section of the E-PVC Plant comprises three reactors that operate continuously and yield PVC by an emulsion process.

In these reactors, VCM is converted to PVC. The produced latex iscontinuously injected into degassing and then to dryers sections.

The 50% concentrated latex is then turned into PVC by dryers using hot air.

The obtained PVC granules are put through a sieve to control the size of the granules. The sieved granules are then conveyed to silos and eventually end up in storehouses after they are bagged.

In addition to the feedstock that is used for the production of E-PVC and S-PVC , a number of substances are also used as additives.

They include dispersant agents, catalysts, stoppers, emulsifiers,

stabilizers, inhibitors, cross-linkings, de-foamers to name some of the most important ones. In a broad comparison, at the S-PVC Plant the PVC cake is dehydrated by centrifuges and at the E-PVC Plant latex is

concentrated by employing the Memberane technology. At both plants, hot and dried air is used  to obtain PVC power.

The dried powder obtained at both plants is later sieved and eventually bagged and stored in warehouses.