Catalysis 2026 Issue

100.0

110

+ 5 Yrs

+ 3 Yrs

Base

50.0

0.0

0.5

1.0

1.5

2.0

Base case

Revamp case

(NPV/Capex) ratio

Variable cost index/ MT MeoH

(Feed + fuel) Cost index/MT MeoH

Netback-$200/MT

Netback-$175/MT

Netback-$150/MT

Figure 6 Variable cost index (per ton MeOH)

Figure 7 (NPV-to-Capex) ratio

Overall, the revamp reflects a balance between improved carbon efficiency in the synthesis loop and modest adjust - ments to front-end energy use. The integrated steam system accommodates these shifts in circulation, boiler feedwater preheat temperature, and purge gas routing without requir - ing modifications to steam generation or any equipment, resulting in a net capacity increase of approximately 5% with manageable impacts on utilities and emissions. Purification system considerations The introduction of ethane into the reformer feed and the use of intermediate methanol condensation in the synthesis loop increase both crude methanol production and reaction water generation, resulting in proportionally higher pro - cess loads entering the purification section. The primary Where ethane is available via an existing or nearby pipeline, co-feeding improves reforming economics without introducing material supply risk or requiring capital-intensive storage or logistics impacts are increased vapour and liquid traffic through the light ends, refining, and rectification columns, along with corresponding increases in reboiler and condenser duties. These changes are a direct consequence of higher overall throughput rather than any shift in reaction chemistry or impurity formation. Importantly, the upstream modifications do not alter the fundamental impurity speciation. The relative formation of oxygenates, higher alcohols, and heavier components remains essentially unchanged, and the reduced loop circu - lation associated with intermediate condensation does not introduce new byproducts. As a result, relative volatilities and separation factors remain stable, and no additional mass-transfer limitations are expected. Conventional three-column methanol purification sys - tems typically include sufficient hydraulic and thermal design margins to accommodate the modest increases in flow and duty associated with a 5% capacity revamp.

Nevertheless, a focused review of column hydraulic capacity, heat-transfer margins, and tray or packing per - formance is recommended to confirm operability at the increased throughput. Overall, the revamp does not require changes to the purification configuration or product quality specifications. Economic evaluation and project viability The economic performance of the proposed revamp is governed by methanol netback, feedstock economics, capital intensity, and the period over which incremental benefits are realised (see Figure 6 ). The base case is eval - uated over a four-year period, consistent with conserv - ative screening criteria commonly applied to brownfield revamps. When assessed over this short horizon, project economics reflect the limited ability of incremental capac - ity projects to fully monetise their benefits within a com - pressed timeframe. As shown in Figure 7 , project economics strengthen materially when evaluated on a longer-term operating basis, without any increase in capital investment. The revamp delivers a stable incremental margin through higher throughput and improved carbon utilisation in the synthesis loop, and these benefits compound over time. When viewed over a realistic remaining asset life, the NPV- to-Capex ratio increases progressively across all netback scenarios, clearly demonstrating the modification’s under - lying economic resilience and value-creation potential. This behaviour is typical of low-Capex revamps, where durable operating improvements outweigh short-term payback metrics and generate sustained returns over extended operating periods. Feedstock considerations further support the economic case. On the US Gulf Coast, ethane maintains a structural cost advantage relative to natural gas on an energy-equiv - alent basis, supported by abundant natural gas liquid (NGL) supply and established pipeline infrastructure. Where ethane is available via an existing or nearby pipeline, co-feeding improves reforming economics without intro - ducing material supply risk or requiring capital-intensive storage or logistics. Combined with the improved carbon efficiency achieved through intermediate methanol con - densation, the revamp benefits from both margin enhance - ment and feedstock efficiency. The capital expenditure used in this analysis is

Catalysis 2026