What Happened
- The West Asia crisis has revived attention on Dimethyl Ether (DME) — an indigenous alternative cooking fuel developed by CSIR-National Chemical Laboratory (CSIR-NCL) in Pune after two decades of research.
- CSIR-NCL has scaled up its pilot plant for DME production to approximately 250 kg per day and is planning a demonstration plant of 2.5 tonnes per day within the next six to nine months in collaboration with Engineers India Limited (EIL).
- DME can be blended with LPG without any modification to existing cylinders, regulators, or burners — the Bureau of Indian Standards (BIS) has issued IS 18698:2024 allowing blends of up to 20% DME with LPG for domestic, commercial, and industrial use.
- Scientists estimate that substituting just 8% of India's LPG consumption with DME could generate annual foreign exchange savings of approximately ₹9,500 crore.
- DME burns cleaner than LPG — with negligible sulphur and nitrogen oxide (NOx) emissions — and can be produced from domestic feedstocks including coal, biomass, natural gas, and methanol.
Static Topic Bridges
Dimethyl Ether (DME): Chemistry and Properties
Dimethyl Ether (CH₃OCH₃) is the simplest ether compound. At room temperature it is a colourless gas with a slight ethereal odour, liquefying under modest pressure (around 5 atmospheres at 25°C) — behaviour very similar to LPG. This physical similarity makes it a natural blending candidate for existing LPG infrastructure. DME has a calorific value slightly lower than LPG (~28.9 MJ/kg vs ~46 MJ/kg) but compensates through cleaner combustion — it contains no carbon-carbon bonds, virtually eliminating particulate and soot formation.
- Chemical formula: CH₃OCH₃ (simplest ether)
- Boiling point: −24°C (close to propane at −42°C, enabling similar storage)
- Calorific value: ~28.9 MJ/kg (vs LPG ~46 MJ/kg)
- Burns completely without soot; negligible SOx, reduced NOx
- Can be produced from methanol (via dehydration), syngas, coal, biomass, or natural gas
Connection to this news: DME's chemical properties make it a drop-in blend with LPG infrastructure — a critical advantage that lowers the transition cost for India's 300+ million LPG-using households.
CSIR-NCL and India's Technology Development Ecosystem
The Council of Scientific and Industrial Research (CSIR) is India's largest publicly funded R&D organisation, operating 37 constituent laboratories across the country. CSIR-NCL (National Chemical Laboratory) in Pune specialises in chemical sciences and has developed the DME production technology using a proprietary catalyst — now patent-protected — that dehydrates methanol into DME. CSIR-NCL signed an MoU with Engineers India Limited (EIL), a Navratna PSU under the Ministry of Petroleum and Natural Gas, to commercialise the technology.
- CSIR was established in 1942 and operates under India's Ministry of Science & Technology
- CSIR-NCL Pune is a premier research institute focused on chemical science, biochemistry, and materials
- Engineers India Limited (EIL) is a Navratna CPSE providing engineering and consultancy services to the hydrocarbon sector
- The CSIR-NCL DME catalyst is patent-protected — a key IP asset for indigenous commercialisation
Connection to this news: The CSIR-NCL / EIL collaboration represents the "lab-to-market" pathway India needs to convert laboratory-scale DME technology into industrial-scale domestic production within 2–3 years.
Bureau of Indian Standards (BIS) and the IS 18698:2024 Standard
BIS is India's national standards body under the Ministry of Consumer Affairs, Food and Public Distribution. Its role in energy transition is critical: new fuels and blends require BIS certification before commercial use. The issuance of IS 18698:2024, permitting up to 20% DME blending with LPG for domestic, commercial, and industrial use, is a regulatory green light that precedes commercialisation. Without this standard, DME blends cannot be legally sold in the Indian market.
- BIS was established under the Bureau of Indian Standards Act, 1986 (revised 2016)
- IS 18698:2024 permits up to 20% DME-LPG blends — current safe blending (no infra change needed) is up to 8%
- The standard covers domestic cylinders, commercial LPG, and industrial applications
- Regulatory clearance is the first step; commercial supply infrastructure must follow
Connection to this news: The BIS standard is already in place — removing one of the key bottlenecks for DME commercialisation. The CSIR-NCL scale-up and the West Asia crisis provide both the technology and the urgency for faster deployment.
Key Facts & Data
- Substituting 8% of LPG with DME could save ~₹9,500 crore in annual forex
- CSIR-NCL pilot plant: 250 kg/day DME; target demonstration plant: 2.5 tonnes/day
- BIS standard IS 18698:2024 allows up to 20% DME blending with LPG
- Up to 8% DME blending requires zero infrastructure modifications
- DME can be produced from methanol, coal, biomass, natural gas — all available domestically
- India imports ~85% of its LPG requirement (~10–12 million tonnes/year)
- CSIR-NCL partnered with Engineers India Limited (EIL) for commercialisation
- CSIR operates 37 laboratories; NCL Pune is a premier chemical research institute