Daily Archives: January 6, 2013

Barbados should be into Butanol, not Ethanol, to power autos – but we lack the vision and leadership

distillery butanol

“It would appear that, only certain persons in this society are founts of knowledge and that their opinions and ideas are adhered to, even when they are talking on subjects outside their area of technical competence.”

by Robert D. Lucas, PH.D.

There was an article entitled “Deal to turn whisky ‘leftovers’ into bio-fuels for cars”, in a local newspaper of Wednesday 26th September 2012. The same news item was aired on the British Broadcasting Corporation (BBC) on Monday 24th September 2012. It was reported in paragraph five of the article that, ninety percent of the stuff which comes out of the distillery is not whisky. It is leftovers like daff and pot ales which are high in sugars. It is planned, as reported in the article, to utilize these leftovers for the manufacture of butanol (an alcohol) for use as a bio-fuel. I have some points and observations which I will now make.

In the past (letters to Advocate: 7th June, 1998; 31st July, 2002; 3rd August, 2004 and 18th May 2006) I have advocated that yeast by-products (which are a high quality source of protein) from rum manufacturing, be utilized in the manufacture of rations for livestock locally. As I pointed out then, alcohol is a toxic by-product of the metabolism of molasses by various strains of yeast Saccharomyces cervisisiae. Once a threshold level of alcohol is reached, the yeast die off; but considerable amounts of free molasses remain. The yeast can be separated and used as a source of high-protein input for animal rations. The cell-free extract can then be distilled to remove ethanol. The residual liquid can be fermented to obtain more alcohol. Alternatively, selective pressure can be used on S.cervisisiae, to obtain strains of yeasts with increased tolerance to ethanol. The same trait can be obtained using genetic engineering techniques, to obtain improve alcohol tolerance of yeasts.

Butanol beats Ethanol for vehicles!

In 2006, in a letter (“Ethanol not the only manufacturing solution”), I proposed that the alcohol of choice for use as a bio-fuel be butanol. Continue reading



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