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PROCESS DESCRIPTION

PATRA - SK

SKEC

Dumai Refinery

Jul. 2007

HCU Revamp

1.0 INTRODUCTION

The existing Hydrocracking Unit is the HC Unibon Unit licensed by UOP which was built in 1984 at Dumai Refinery of Pertamina. The unit consists of two identical trains (HCU-211 and HCU-212) and the design feed rate of one train is 27,800 BPSD. The feedstock of Hydrocracking Unit is the mixed feed of heavy vacuum gas oil from High Vacuum Unit (HVU) and heavy coker gas oil from Delayed Coker Unit (DCU).

Pertamina and SK are considering a minor revamp to increase the feed rate of the existing Hydrocracking Unit (HCU-212) to 31,500 BPSD with 4,500 BPSD of the distillate production (100D and 150D) in order to meet the feedstock demand of new lube base oil plant keeping the minimum 22,000 BPSD (*) of middle distillate products and meet 18 month catalyst cycle.

(*) The amount of middle distillate should be finalized according to the agreement

between SK and Pertamina after UOPs yield estimation.

( This section shall be confirmed and revised by SK Corp.

Design Basis for HC Unibon Process Unit Sheet 1 of 1HCU- 01

L-Project

Rev. 0, May 25, 2006


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