Formosa refinery improves sweetening with amine blends

Taiwan

Formosa Petrochemical Corp. (CPAC) has reduced the mass flow of the regeneration and increase the absorption capacity and regeneration at the amine treatment system regeneration after replacing diethanolamine (DEA) with methyldiethanolamine (MDEA) / DEA blends online.

The necessary MDEA / DEA mixture formulation was compared to a 1.647, which was based on the specification of CO downstream of residue catalytic cracker (RCC). Using the highly effective MDEA / DEA blends reduces the velocity and mass flow amine regeneration of around 18%.

This decrease resulted in steam consumption being reduced by 24% and the gas processing capacity being increased by 12% by improving the efficiency and introducing new expansion absorbers on line.

Introduction

Feed gases to the absorbers derive from the following upstream units in FPCC's refinery, Taiwan:

Various feed gases, the recycle gas from hydroprocessing unit at 40-80 kg/sq cm (g) pressure, the hydrocracking unit at 150-210 kg/sq cm (g), or about 2,204~3,086 psig pressure, and all the other units at 13~23 kg/sq cm (g) pressure are introduced at the bottoms of the individual absorbers, which is packed or trayed, and contacted counter currently with amine solution absorbing the acid gas in the amine.

Rich-amine solution leaving the absorbers flows to the regenerator, contacting stripping steam generated by the reboiler. The hot lean amine from the reboiler is then circulated back to the absorber.

It is a simple absorption reaction, as shown in the first reaction in the accompanying box. H S/mole of MEA, increasing the cycle rate of amine. MEA is the strongest base of alkanolamines; corrosion and foaming have been the major difficulties with its use. Therefore a 15~20% solution in water is most often used for sweetening.

DEA is a secondary amine and was applied in sweetening gas streams of FPCC's refinery. As DEA will react regeneratively with COS and CS in the gas.

MDEA can be used in higher amine solution concentrations. It has a number of properties that make it desirable for broader application over primary and secondary amines including higher acid-gas loading with fewer corrosion problems, lower reaction heat leading to lower stripping steam consumption, higher resistance to degradation, and lower vapor pressure leading with lower amine losses.

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Formosa refinery improves sweetening with amine blends

The H 2 S removal improved by around 4.5% in kg mole, and it was expected that H 2 S content in the acid gases could be increased. • Circulation rate and energy saving. The conversion of MDEA/DEA blends demonstrated that high solution concentration and



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