Why in News?
Recently the CSIR-National Chemical Laboratory (NCL) in Pune announced plans to scale its indigenous DME production technology from pilot stages to industrial-scale demonstration plants (2.5 tonnes per day).
Physical & Chemical Properties
- Appearance: A colourless gas that easily liquefies under low pressure (~5–10 bar), making it compatible with existing LPG cylinders.
- Combustion: Burns with zero soot and extremely low particulate matter (PM) and Nitrogen Oxide (NOx) emissions.
- Energy Profile: It has a high cetane number, making it an excellent alternative for diesel engines.
Strategic Benefits for India
- Infrastructure Compatibility: An 8% blend with LPG requires zero changes to existing stoves, regulators, or cylinders. Up to 20% can be used with minor modifications to regulator seals.
- Feedstock Versatility: Can be produced from India’s abundant coal reserves (via gasification), agricultural waste (stubble), and even municipal solid waste.
- Methanol Economy: It is a core pillar of NITI Aayog’s "Methanol Economy" program aimed at reducing the national oil import bill.
Primary Applications
- Cooking Fuel: Blended with LPG for domestic use, particularly to insulate the Pradhan Mantri Ujjwala Yojana from global price shocks.
- Transportation: Used as a 100% fuel for specialized vehicles; India's first 100% DME-fuelled tractor was developed by IIT Kanpur in collaboration with TAFE.
- Industrial Uses: Acts as an eco-friendly aerosol propellant (replacing CFCs), a refrigerant, and a chemical intermediate for making olefins and plastics.
Challenges to Adoption
- Solvent Properties: At high concentrations (>20%), DME can degrade standard rubber gaskets and seals, requiring specialized materials for long-term use.
- Lower Calorific Value: Compared to pure LPG, DME has a lower energy density, meaning slightly more fuel is required to perform the same amount of work.
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