Amine Unit Corrosion in Refineries by J Harston, F Ropital

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By J Harston, F Ropital

The corrosion of carbon steels in amine devices used for gasoline remedy in refining operations is a tremendous challenge for the petrochemical undefined. Maximising amine unit reliability, including enhancing throughput, circulate and therapy means, calls for more beneficial methods of measuring and predicting corrosion premiums. besides the fact that, there was a scarcity of knowledge on corrosion. This helpful record is helping to therapy this lack of expertise via summarising findings from over 30 crops. It covers such amine kinds as methyl diethanolamine (MDEA), diethanolamine (DEA), monoethanolamine (MEA) and di-isopropanolamine (DIPA), and makes tips on fabrics and approach parameters to maximize amine unit potency and reliability.

  • Covers such amine varieties as Methyl Diethanolamine (MDEA) and Di-isopropanolamine
  • Makes tips about fabrics and technique parameters to maximize amine unit potency and reliability

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1 Amine parameters and foaming Amine Concentration (wt%) Circulation 22 20 25 25–30 16–30 30 40 t h–1 76 t h–1 80 t h–1 30–50 t h–1 30–65 t h–1 35 t h–1 Loss 30 t N/A N/A 27 t 10 t 67 t a–1 a–1 a–1 a–1 Foaming Plant No No No Sometimes Noticed Sometimes (1) (2) (3) (4) (5) (6) Experiences of twenty-one plants using diethanolamine Amine Concentration (wt%) Circulation 16–23 22–27 20–24 29 ? 8 30 45–65 t h–1 15–30 t h–1 64 t h–1 170 m3 h–1 ? 2 23 Loss Foaming Plant 52 t a–1 26 t a–1 14 t a–1 60 t a–1 ?

2 Location of problems per item of equipment Regenerators (7), (8), (11), (12), (13), (16), (17), (18) Regenerator overheads drum (1), (4), (5), (12) Regenerator overheads condenser Regenerator overheads piping (4), (5), (12) (2), (5) Regenerator reboiler (1), (7), (8), (11), (12), (13), (14), (15), (17), (18), (20) Rich–lean exchanger (3), (6), (7), (9), (11), (12), (14), (18) Lean amine (1), (11) 5 Experiences of four plants using monoethanolamine The plant numbers are given in parentheses. e.

8 30 45–65 t h–1 15–30 t h–1 64 t h–1 170 m3 h–1 ? 2 23 Loss Foaming Plant 52 t a–1 26 t a–1 14 t a–1 60 t a–1 ? 5 t a–1 (4 × inventory) No Rare Yes Yes ? 4 mol mol–1? 05 mol mol–1 ? 6 (formate and acetate) 1–5 Not known ? 0? 4 m s–1 for stainless steel. 2 Location of problems per item of equipment Regenerators (7), (8), (11), (12), (13), (16), (17), (18) Regenerator overheads drum (1), (4), (5), (12) Regenerator overheads condenser Regenerator overheads piping (4), (5), (12) (2), (5) Regenerator reboiler (1), (7), (8), (11), (12), (13), (14), (15), (17), (18), (20) Rich–lean exchanger (3), (6), (7), (9), (11), (12), (14), (18) Lean amine (1), (11) 5 Experiences of four plants using monoethanolamine The plant numbers are given in parentheses.

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