Proceedings of the South & East African combined agricultural, cotton, entomological and mycological conference held at Nairobi, August, 1926

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Monograph

Identifikator:: 1738588467

URN:: urn:nbn:de:zbw-retromon-115043

Document type:: Monograph

Title:: Proceedings of the South & East African combined agricultural, cotton, entomological and mycological conference held at Nairobi, August, 1926

Place of publication:: Nairobi

Publisher:: East African Standard

Year of publication:: 1926

Scope:: VI, 337 Seiten; Ill.

Digitisation:: 2020

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: Part II. Agriculture

Collection:: Economics Books

PART TI. Uganda is setting an example to Kenya, for a distillery which has been erected to work in connection with the sugar mill at Jinja, is about to commence operations. The milling capacity is 400 tons of cane per day, and the distillery is capable of producing forty gallons of etherized alcohol per hour. Another sugar mill with an annual output of 10,000 tons of sugar is to be erected at Kamiti, and when it is crushing to its full capacity it will produce molasses sufficient-to run a unit distilling plant. The consumption of petrol in Kenya and Uganda in 1925 was 1,500,000 gallons and it should be possible for these three mills to supply Kenya and Uganda with motor spirit to the extent of one half of this amount. According to different authorities the cost of producing 959% aleohol, without recovering potash and nitrogen from the residues, and excluding the cost of molasses which is rightly charged to the sugar, has been stated to be approximately 5d. It will pay to concentrate the spent wash to a fertiliser syrup which can be easily transported and applied to the soil. This can be done economically in a multiple effect, the vapours from the last unit being finally used to heat the column. Heriot (meeting of the Society of Chemical industry, 1920) quoted actual working figures shewing that the value of the fertiliser syrup produced in this way, covered the total working expenses of a particular distillery leaving the alcohol as a by-product free of cost. At the present local prices of artificial fertilisers the fertilising ingredients in the spent wash from each gallon of alcohol would be worth about 6d. Allowing for the cost of recovery, a portion of this sum could be placed to the credit of the alcohol thereby reducing working expenses. S1san. Waste: Mr. A. C. Barnes, Chemical Officer, examined the undiluted juice after decortication and found it to contain 1.65% of fermentable matter. It was concluded that from liquids with such a low percentage of fermentable matter, alcohol could not be produced by any economical process. Very dilute liquors containing 1.3% to 2.0% of fermentable sugars are obtained in the manufacture of wood pulp by the sulphite cooking process, and after fermentation produce a wash containing about 1.09 of alcohol, which is recovered by distillation. The cost of recovering alcohol from sisal juice should be about the same as that of sulphite liquor and estimates of the latter vary from 5}d. to 71d. per gallon pre-war to more than 1/- during the war. If aleohol can be recovered economically from sulphite liquor, then its recovery from sisal juice is not impossible, and the matter might be worth further investigation. CELLULOSIC MATERIALS : Woop Waste: The cellulose of plants may be converted into fermentable sugars by hydrolysis with mineral acids under pressure and at elevated temperatures. The processes employing the use of dilute acids are cheaper, but the highest yields are obtained from those in which strong acids renders their use costlv and the commer- A )

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