Why govt is encouraging ethanol production

In News

  • The Ministry of Environment and Forests has announced that mills would not require separate environmental clearance to produce additional ethanol from B-heavy molasses.
  • The proposals to undertake additional ethanol production from B-heavy molasses/would be considered under the provisions of the EIA notification, 2006, by an expert appraisal committee for granting environmental clearance.
  • The decision comes at a time when the country is looking at heavy oversupply of sugar, and various measures have been launched by the central government to address the systemic issue.

Other moves related to Ethanol in the recent past

  • In September 2019, the government approved an increase in the price of ethanol to be procured by public sector oil marketing companies from sugar mills for blending with petrol from December 1.
  • The Cabinet Committee on Economic Affairs also allowed conversion of old sugar into ethanol, which is expected to help mills deal with the current overproduction in the sweetener
  • Ethanol production has been additionally facilitated with the government mandating 10% blending of petrol with ethanol.

What are ethanol and molasses?

  • Ethanol, can be produced from sugarcane, maize, wheat, etc  which have high starch content and is a liquid that has several uses.
  • At 95% purity, it is called rectified spirit and is used as the intoxicating ingredient in alcoholic beverages.
  • At 99%-plus purity, ethanol is used for blending with petrol. Both products are made from molasses, a byproduct of sugar manufacturing.
  • For making sugar, mills crush sugarcane which typically has a total fermentable sugars (TFS) content of 14%.
  • The TFS component consists of sucrose along with the reducing sugars glucose and fructose. Most of this TFS component gets crystallised into sugar, and the remaining part is called molasses.

Molasses stages

  • The molasses go through three stages β€” A, B, and C, the last one being where the molasses are most un-crystallised and non-recoverable.
  • The β€˜C’ molasses roughly constitute 4.5% of the cane, and have a remaining TFS of 40%.
  • After C-molasses are sent to the distillery, ethanol is extracted from them. Every 100 kg of TFS yields 60 litres of ethanol.
  • Thus, from one tonne of cane, mills can produce 115 kg of sugar (at 11.5% recovery) and 45 kg of molasses (18 kg TFS) that gives 10.8 litres of ethanol.

How more ethanol can be produced?

  • Mills can also produce only ethanol from sugarcane, without producing sugar at all. In this case, the entire 14% TFS in the cane is fermented. Here, a mill can make 84 litres of ethanol and zero kg of sugar.
  • In between the two extreme cases, there are intermediate options as well, where the cane juice does not have to be crystallised right till the final β€˜C’ molasses stage.
  • The molasses can, instead, be diverted after the earlier β€˜A’ and β€˜B’ stages of sugar crystal formation. Mills, then, would produce some sugar, as opposed to fermenting the whole sugarcane juice into ethanol.
  • If ethanol is manufactured using β€˜B’ heavy molasses (7.25% of cane and with TFS of 50%), around 21.75 litres will get produced along with 95 kg of sugar from every 1 tonne of cane.
  • The latest move by the government is to waive the environmental clearance required to produce ethanol at this stage. This was done since this process does not contribute to the pollution load.
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Why focus on more ethanol?

  • Mills currently have all-time-high stocks of sugar, and they have been facing issues with farmers over non-payment of dues.
  • Mill owners insist that the reason behind their woes is excess production of sugar and fall in its price.
  • Under the circumstances, ethanol is the only real saviour β€” both for mills and cane growers.

Ethanol Blending

Background:

  • The use of ethanol as an automobile fuel is as old as the invention of the internal combustion engine itself. Ethanol was examined as an automotive fuel by Nikolas A Otto in 1897 during his early engine studies.
  • It has been used in cars since Henry Ford designed his 1908 Model T to operate on alcohol.Brazil has been using this fuel since 1920s.

Benefits:

  • It helps in reducing dependence on oil imports, at the same time keeping a check on the import bill by saving precious foreign currency.

Environment friendly:

  • As the ethanol molecule contains oxygen, it allows the engine to more completely combust the fuel, resulting in fewer emissions.
  • Since ethanol is produced from plants that harness the power of the sun, it is also considered a renewable fuel.

Engine Friendly:

  • With a high octane rating, ethanol is a high performance fuel on the market and keeps today’s high-compression engines running smoothly.
  • Ethanol-blended fuel keeps the fuel system clean for optimal performance because it does not leave gummy deposits.
  • It helps prevent wintertime problems by acting as a gas-line antifreeze.

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