This olefin plant uses the following feeds :

Ethane, pre-fractionation of light ends, raffinate from aromatic complexes, C5 cut, LPG, C4 recycle from butadiene extraction unit. The Sixth Olefin Plant consisted of a thermal cracker (heaters) and a very complex compression, separation, and fractionation as well as purification units, which included refrigeration, water scrubbing, amine treating, stabilizing, and hydrogenation unit.

Since this unit was a part of a large petrochemical complex, the utilities requirements were basically provided by the utility units of the complex. However, this unit produces fuel for its own consumption. A specific PSA unit is provided for hydrogen requirements of the plant. It also had its own flare and fire fighting systems. A tank farm was included in the plant’s scope of work too.

The main purpose for the installation of this plant was to produced polymer grade ethylene and propylene.However, it produces hydrogen and methane off gases, butane cut, and gasoline residue. The control system of this plant was of DCS type. Project schedule was 30 months. EIED was the Leader of the Joint- Venture reviews the Basic Design provided by Linde AG and carried out the Detailed Design Engineering and procurement services for the Iranian supply of equipment.

The procurement basically consisted of the fixed equipment which included    vessels, columns, tanks, heat exchangers, etc. EIED and Linde AG provided the required supervision for the installation and reviewed the entire works, up to the start-up of the plant. A special feature of this project was the use of PDMS for the 3D design of the plant  used as the basis for piping design , maintenance , access check, and clash detection, etc.