A refinery of sugar from the beet root was erected at Thames Bank, Chelsea, in the early part of 1837. During the summer of 1839 a great many acres of land were put into cultivation with the root, at Wandsworth and other places in the vicinity of the metropolis. The machinery used in the manufacture was principally on the plan of the vacuum pans, and a fine refined sugar was produced from the juice by the first process of evaporation, after it had undergone discolorization. Another part of the premises was appropriated to the manufacture of coarse brown paper from the refuse, for which it is extensively used in France.
A refinery was also established about this period at Belfast, in the vicinity of which town upwards of 200 acres of land were put into cultivation with beet root for the manufacture of sugar.
The experience of France ought to be a sufficient guarantee that the manufacture of beet root sugar is not a speculative but a great staple trade, in which the supply can be regulated by the demand, with a precision scarcely attainable in any other ease, and when, in addition, this demand tends rather to increase than to diminish. That the trade is profitable there can also be no doubt from the large capital embarked in it on the Continent—a capital which is steadily increasing even in France, where protection has been gradually withdrawn, and where, since 1848, it has competed upon equal terms with colonial sugars.
The produce of France in 1851 was nearly 60,000 tons. The beet root sugar made in the Zollverein in 1851 was about 45,000 tons. Probably half as much more as is made in France and the Zollverein, is made in all the other parts of the Continent. In Belgium, the quantity made is said to be 7,000 tons; in Russia, 35,000; making a total of beet root sugar now manufactured in Europe of at least 150,000 and probably more, or nearly one-sixth part of the present consumption of Europe, America, and our various colonies. In 1847 this was estimated at upwards of 1,000,000 tons; and, as the production has increased considerably since that period, it is now not less than 1,100,000 tons. The soil of the Continent, it is said, will give 16 tons to the acre, and that of Ireland, 26 tons to the acre. The former yields from 6 to 7 per cent.—the latter from 7 to 8 per cent. as the extreme maximum strength of saccharine matter. The cost of the root in Ireland—for it is with that, and not with the cost of the Continental root, with which the West Indies will have to contend—is said to be at the rate of 16s. per ton this; but will probably be 13s. next season. The cost of manufacture is set down at £7 5s. per ton. Calculating the yield of the root to be 7½ lbs. to every 100 lbs., for 26 tons the yield would be nearly 2 tons of sugar, which would give about £9 10s. per ton, putting down the raw material to cost 14s, 6d. per ton, the medium between 16s. and 13s. Thus a ton of Irish-grown and manufactured beet root sugar, would cost £16 15s. per ton. Mr. Sullivan, the scientific guide to those who are undertaking to make beet root sugar at Mountmellick, Queen's County, Ireland, estimates the cost of obtaining pure sugar at from £16 17s. to £19 18s. per ton, according to the quantity of sugar in the root.
Beet root is a vegetable of large circumference, at the upper end nine to eleven inches in diameter. There are several kinds. That which is considered to yield the most sugar is the white or Silesian beet (Beta alba). It is smaller than the mangel wurzel, and more compact, and appears in its texture to be more like the Swedish turnip. For the manufacture of sugar, the smaller beets, of which the roots weigh only one or two pounds, were preferred by Chaptal, who, besides being a celebrated chemist, was also a practical agriculturist and a manufacturer of sugar from beet root. After the white beet follows the yellow (beta major), then the red (beta romana), and lastly the common or field beet root (Beta sylvestris). Margraf, as we have seen, was the first chemist who discovered the saccharine principle in beet root; and Achard, the first manufacturer who fitted up an establishment (in Silesia) for the extraction of sugar from the root. It was not before 1809 that this manufacture was introduced into France.
The manufacture sprung up there in consequence of Bonaparte's scheme for destroying the colonial prosperity of Great Britain by excluding British colonial produce. It having been found that from the juice of the beet root a crystallizable sugar could be obtained, he encouraged the establishment of the manufacture by every advantage which monopoly and premiums could give it. Colonial sugar was at the enormous price of four and five francs a pound, and the use of it was become so habitual, that no Frenchman could do without it. Several large manufactories of beet root were established, some of which only served as pretexts for selling smuggled colonial sugar as the produce of their own works. Count Chaptal, however, established one on his own farm, raising the beet root, as well as extracting the sugar. The roots are first cleaned by washing or scraping, and then placed in a machine to be rasped and reduced to a pulp. This pulp is put into a strong canvas bag and placed under a powerful press to squeeze out the juice. It is then put into coppers and boiled, undergoing certain other processes. Most of the operations are nearly the same as those by which the juice of the sugar cane is prepared for use; but much greater skill and nicety are required in rendering the juice of the beet root crystallizable, on account of its greater rawness and the smaller quantity of sugar it contains. But when this sugar is refined, it is impossible for the most experienced judge to distinguish it from the other, either by the taste or appearance; and from this arose the facility with which smuggled colonial sugar was sold in France, under the name of sugar from beet root. Five tons of clean roots produce about 4½ cwt. of coarse sugar, which give about 160 lbs. of double refined sugar, and 60 lbs. of inferior lump sugar. The rest is molasses, from which a good spirit is distilled. The dry residue of the roots, after expressing the juice, consists chiefly of fibre and mucilage, and amounts to about one-fourth of the weight of the clean roots used. It contains all the nutritive part of the root, with the exception of 4½ per cent. of sugar, which has been extracted from the juice, the rest being water.
As the expense of this manufacture greatly exceeded the value of the sugar produced, according to the price of colonial sugar, it was only by the artificial encouragement of a monopoly and premiums that it could be carried on to advantage. The process is one of mere curiosity as long as sugar from the sugar cane can be obtained cheaper, and the import duties laid upon it are not so excessive as to amount to a prohibition; and in this case it is almost impossible to prevent its clandestine introduction.
Another mode of making sugar from beet root, practised in some parts of Germany, is as follows, and is said to make better sugar than the other process:—The roots having been washed, are sliced lengthways, strung on packthread, and hung up to dry. The object of this is to let the watery juice evaporate, and the sweet juice, being concentrated, is taken up by macerating the dry slices in water. It is managed so that all the juice shall be extracted by a very small quantity of water, which saves much of the trouble of evaporation. Professor Lampadius obtained from 110 lbs. of roots 4 lbs. of well-grained white powder-sugar, and the residuum afforded 7 pints of spirit. Achard says that about a ton of roots produced 100 lbs. of raw sugar, which gave 55 lbs. of refined sugar, and 15 lbs. of treacle. This result is not very different from that of Chaptal. 6,000 tons of beet root it is said will produce 400 tons of sugar and 100 tons of molasses.
Beet root sugar in the raw state contains an essential oil, the taste and smell of which are disagreeable. Thus the treacle of beet root cannot be used in a direct way, whereas the treacle of cane sugar is of an agreeable flavor, for the essential oil which it contains is aromatic, and has some resemblance in taste to vanilla. But beet root sugar, when it is completely refined, differs in no sensible degree from refined cane sugar. In appearance it is quite equal to cane sugar, and the process of refining it is more easy than for the latter. Samples made in Belgium were exhibited at a late meeting of the Dublin Society. It was of the finest appearance, of strong sweetening quality, and in color resembling the species of sugar known as crushed lump. The most singular part of the matter is, that it was manufactured in the space of forty-five minutes—the entire time occupied from the taking of the root out of the ground and putting it into the machine, to the production of the perfect article. It was said that it could be produced for 3d. per lb. An acre of ground is calculated to yield 50 tons of Silesian beet, which, in France and Belgium, give three tons of sugar, worth about £50; the refuse being applied in those countries to feeding cattle. But from the superior fitness of the Irish soil, as shown by experience to be the case, it is confidently affirmed by persons competent to form an opinion, that 8 per cent. of sugar could be obtained there on the raw bulk.
The following figures are given as illustrative of the expense of the cultivation of one acre of beet-root in Ireland:—