Silane based CO2 to solid carbon system

Silane is one of the few flammable compounds that readily combusts in a pure CO2 atmosphere producing a pure solid carbon byproduct.
Silane emerges as an attractive solution to dispensing with captured carbon dioxide. Currently, there exists no practical method to convert carbon dioxide to a more easily stored substance.
The principle of this cycle is combusting silane gas in a CO2 or CO2/argon atmosphere, using the CO2 as an oxidizer, producing energy via a supercritical CO2 turbine, emitting solid carbon and silicon dioxide, then separating the silicon dioxide from the solid carbon, to then reuse for other applications.

98% metallurgical grade silicon: $1500/ton, 0.85 per ton of silane

Potential silane cost including reactor capex, chlorine and hydrogen consumption: $3000-3200/ton

1 ton of silane = 2.75 tons/CO2 consumed

Biproducts to resale

1.87 tons silicon dioxide at $750/ton

0.75 tons carbon powder at $700/ton

Electricity: $600

Total downstream revenue potential: $2530

Potential price per ton of carbon dioxide reduced: $180-250 (no comparable method available to compare cost)

Trisilane supercritical S-CO2 turbine marine and rail propulsion

Trisilane is an ideal carbon free fuel as it’s a dense liquid at room temperature and pressure (740 kg/m3), burns efficiently and possesses high energy density (40+ MJ/kg). The only biproduct of combustion is silicon nitrade, a solid. Triilane is ideal for use in external combustion cycles such as S-CO2 Brayton cycles. Heavy duty propulsion applications such as marine and rail require an energy density liquid fuel, the issue is all current carbon free fuels suffer from storage and energy density constraints. Tisilane offers an ideal carbon free propulsion option for heavy duty propulsion. Trisilane is compatible with current liquid infrastructure and holds the title as being the only carbon free liquid fuel, excluding hydrazine, which is considered too toxic. All other carbon free fuels are gaseous or require carbon recycling. Potential power density of supercritical S-CO2 bottoming cycles are 1.4 MW/Ton.

Affordable Hydrazine production from conventional Raschig process

Use of liquid fuel reactors to produce hydrazine for under $500/ton.

0.75-1 ₵/kwh levelized generation cost

Capex: $1,000,000/mw

Lifetime: 40 years

Planned capacity: 41 mw

Hydrazine production: 1.9 tons per hour

Potential revenue: $81,000,000

Chlore-Alkali membrane electrolyzer: Plant capex: $105,000/tpd $19/ton NaOH/CI ($480 million for 1,680,000 tpy capacity, 15 year before major refurbishment)

Sodium hydroxide: 4.0 ton/ton N2H4: 2500 kwh/ton: $29. (sodium chloride bi-product recycled)


Chlorine: 2.6 ton/ton N2H4: 2500 kwh/ton: $25

Total: $65

0.9 tons NH3 $100/ton: No cost as 240 kg of H2 are produced from electrolyzing sodium chloride

Total: $308/ton N2H4

N2H4 12.58% H2 by weight

Raschig plant cost very minimal: $49/ton N2H4: $12,000,000 for 7,000 tpy (35 year lifetime)

Total electricity consumed: 21,500 kwh/ton N2H4

Salt continuously recycled, sodium hydroxide and chlorine consumed, sodium chloride produced as bi-product of Raschig process then re electrolyzed into sodium hydroxide, closed-loop system!

Net H2 cost: $2.7/kg. PEMFC 2.6x more efficient than SI engine, cost per gallon gasoline equevalent is $1.03/gal!

Current market price for hydrazine in China: $5200/ton