Catalysis 2026 Issue

Boosting ATR methanol capacity within existing assets

Revamp strategies combining ethane co‑feeding and intermediate condensation unlock a 5% methanol capacity increase, improving conversion and carbon efficiency

VK Arora Kinetics Process Improvements (KPI)

T his study evaluates a low-capital revamp strategy to increase methanol plant capacity through two com- plementary modifications: controlled ethane blending into the reformer feed and intermediate methanol conden- sation between synthesis stages. Modest ethane co-feed - ing increases syngas production while remaining within existing equipment and metallurgical limits. Intermediate condensation removes methanol and water from the syn- thesis gas between reactor stages, shifting reaction equi - librium, increasing single-pass conversion, and improving carbon efficiency. This is accomplished by adding in-loop cooling, heat transfer, and condensate removal functional - ity that integrates with the existing synthesis loop without altering its fundamental configuration. The resulting capacity increase is additive to the plant’s current maximum sustainable operating rate. It cannot be achieved solely through catalyst replacement, because the synthesis loop is constrained by equilibrium, circulation, and compression limits rather than by intrinsic catalyst activity. The combined modifications require no additional com - pressor power, no major equipment replacement, and no changes to the purification section. Operating impacts remain within existing utility and environmental envelopes. With minimal capital investment, the revamp provides a practical, low-risk pathway to enhance long-term asset competitiveness using existing facilities. Feedstock flexibility Growing global methanol demand and tightening 6.0

and a tube-cooled converter (TCC). The revamp concept applies two complementary measures: controlled ethane co-feeding at a modest, operationally manageable level that increases syngas production while remaining within established ATR operating limits, and intermediate meth - anol condensation to raise per-pass conversion in the syn- thesis loop. Feedstock flexibility is a key enabler of this strategy. On the US Gulf Coast, long-term pricing trends (see Figure 1 ) show that ethane consistently maintains a meaningful cost advantage over natural gas on an energy-equivalent basis. This structural advantage is supported by sustained growth in natural gas liquids production, stable petrochem - ical demand, and expanding export capacity. Ethane also provides higher carbon-to-methanol efficiency, thereby strengthening feed economics across the forecast horizon. Intermediate methanol condensation removes the meth - anol formed in the first converter stage, shifts the equi - librium toward additional conversion, and enables higher loop productivity without replacing existing loop equip- ment. The existing synthesis loop configuration is shown in Figure 2 , and the modified configuration in Figure 3 , where the added heat exchange and separation steps are incorporated into the overall loop arrangement. Together, these measures provide a practical pathway to incremental capacity expansion with limited capital exposure and man- ageable execution risk.

1.0

margins are pushing pro- ducers toward brownfield expansions that extract more value from existing assets. This study evaluates an integrated set of front-end and synthesis-loop modifi - cations designed to deliver a 5% throughput increase in a 5,000 tpd autothermal reformer (ATR)-based facility equipped with parallel water- cooled converters (WCCs)

4.0

0.9

2.0

0.0

0.8

2025

2026 2027

2028 2029 2030

2031

2032 2033 2034

2035

Year

Natural gas price - $/MMbtu

Ethane price - $/MMbtu

Price ratio - (Ethane/NG)

Figure 1 Pricing trend (2025-2035) – US Gulf Coast (natural gas and ethane)

Catalysis 2026