RECAST - A System to
Decarbonise Long-Distance Shipping

Reducing CO2 Emissions

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RECAST could deliver decarbonisation of shipping with conventional engines, using lime as a sorbent and as part of the fuel for the ship.

The system involves (i) on-land processing of limestone (CaCO3) to low-emissions lime (CaO) in a Calix LEILAC calciner, which can capture the process and heating CO2 emissions for minimal energy or operating penalty ( ), and will be fuel agnostic, (ii) Sequestering the captured CO2 (CCS/CCU), (iii) Using the low-emissions lime to capture the CO2 from ship stacks (bunker fuel, marine diesel or LNG) using Calix’s Direct Capture Technology.

NOx and SOx reductions are also being targeted with additives, (iv) Using the heat released by CaO recarbonation and fuel slip oxidation in the scrubber and engine waste heat to generate further motive power. Initial estimates suggest over a 1/4 increase in range per tonne of bunker fuel / LNG. Initial estimates indicate the cost of CO2 avoided could be as low as US$70/t, depending mainly on lime costs.

The innovation is to bring these technologies together in RECAST at a commercial scale on a ship, in combination with zero emissions lime production on land. This paper describes the system, and the development steps by which it will be fully demonstrated.


Watch the live presentation 

RECAST – A System to Decarbonise Long-Distance Shipping – Dr Brian Sweeney

Keywords: Decarbonisation of shipping, Lime as sorbent, Lime as additional energy, Exothermal reaction heat recovery, Net zero CO2, Pollutant reduction, Reduce ocean acidity, Calcium looping, Carbon Capture & Storage

Introducing Dr. Brian Sweeney

Brian spent 20 years working with Shell around the world, and eight years with the Rolls-Royce Industrial Power Group. Brian’s current role is in business development at Calix Europe, and he has been instrumental in helping develop the Calix Process into several CO2 emissions reduction initiatives.

He has been a key Calix team member on numerous successful CO2 reduction applications grants, including DECC, the LEILAC Project and ASCENT, and he also leads the RECAST initiative. Brian studied engineering at Cambridge University and Columbia University, New York.


Maritime transport emits around one billion tonnes of CO2 annually – about 2.5% of global CO2 emissions – and these emissions are set to grow by between 50% and 250% by 2050*.

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