The only raw material required is coal (or natural gas), sodium chloride (salt) and water. The process locks carbon dioxide (CO2) and carbon monoxide (CO) into sodium bicarbonate and sodium carbonate.
The system of processes for sequestering carbon in coal-burning power plants and producing hydrogen gas that takes advantage of emission of CO and CO2 and heat from the plants has been developed by a professor of Mechanical and Materials Engineering at Florida International University (FIU) in Miami. The use of the process will lead to cheap hydrogen and hydride production and carbon sequestration and reduced global warming.
The process includes using any gas mixtures exhausting from the power plant; and adjusting the composition of the feed stock (sodium hydroxide) to react with components of gas selected from sulfur dioxide, nitric oxide, or both; and forming removable solids.
In the process it is possible to recover additional cost by selling reaction products selected from sodium carbonate, sodium bicarbonate, hydrogen, and chlorine at market prices to recover any additional costs that are incurred due to the use of sodium hydroxide.
No one can deny that there is an urgent need to develop innovative solutions to reduce the emissions from our automobiles and from our coal or gas burning power plants. Saxena’s invention may well provide an answer to the problem of greenhouse gas emissions and pave the way towards a clean energy future. The system addresses carbon sequestration in coal or gas burning plants used for power generation or for manufacturing (cement, steel etc.). The chemical process that sequesters carbon gases (thus preventing them from escaping to the atmosphere) also generates hydrogen as a byproduct.
FIG. 14 shows a not-to-scale illustration of a screw reactor sketched in FIG. 12. The reactor could be used for both CO and CO2 and if needed for reaction (5) the natural gas with different times and temperatures as required.
FIG. 16 shows plot of calculated costs for carbon sequestration. It is demonstrated that for a range of values for sodium hydroxide, the material costs remain negative i.e. money is actually saved by sequestering carbon gases and producing hydrogen. Note that none of the other costs of manufacturing, such as infra-structure development, energy and labor, are included in the calculations.
TABLE 3 calculates cost of the use of soda in sequestering additional CO2.