US1132868A

US1132868A - Process of refining raw cane-sugar.

Info

Publication number: US1132868A
Application number: US84640314A
Authority: US
Inventors: Franz Murke
Original assignee: Individual
Current assignee: Individual
Priority date: 1914-06-20
Filing date: 1914-06-20
Publication date: 1915-03-23
Anticipated expiration: 1932-03-23

Description

, other impurities.

. crystals.

UNITED STATES PATENT OFFICE.

FRANZ HUB-KB, 013 FORT COLLINS, COLORADO.

PROCESS OF BEFIN'ING RAW CANE-SUGAR.

No Drawing.

To all whom it may concern:

Be it known that I, FRANZ MURKE, a citizen of the United States, residing at Fort Collins, in the county of Larimer and State of Colorado, have invented new and useful Improvements in Processes of Refining Raw Cane-Sugar, of which' the following is a specification. 4

My invention relates to the refin ng of sugar, and particularly to the refining of raw cane sugar.

It is well known that raw cane sugar consists of sugar crystals which are surrounded by molasses, a syrup containing considerable amounts of glucose or invert sugar, besides In the treatment of the raw sugar by the hot lime process, the sugar is boiled with sufficient lime to eliminate the glucose, but while the glucose is destroyed as such, there are lime salts formed which are molasses forming.

The syrup surrounding the sugar crystals and containing nated by washing with wash syrups, or water, or steam, until the sugar is free from glucose, but the washed sugar crystals thus obtained contain coloring materials which penetrate the su ar crystals and can not be washed away. nasmuch as the thoroughly washed cane sugar can not be made whiter b further washing, I proceed to destroy or ciiange the coloring materials by boiling the .solution of the well washed raw cane sugar with lime to such a degree that, after precipitating the lime by carbonic acidand sulfurous acid, or sulfurous acid alone, with the necessary filtrations, the resulting fillmass turns out a perfectly white sugar.

A decided chemical reaction may be observed during the process of boiling the washed raw cane sugar solution with lime,

as and foam being formed. This reaction fiIStS about three to five minutes until the ehan 'ng or conversion of the coloring materia is completed and the juice comes to a uiet and clear boiling, like ordinary solutions of refined sugar will show in boilin My process, as above outlined, is preferab y carried out as follows ::High grade raw cane sugar is mixed with molasses to amagma, which is then spun in centrifugal machines and the sugar Washed with water or other suitable agent in order to remove the glucose and other impurities surrounding the sugar By the term other suitable agent it is understood that the washing Specification of Letters Patent.

Application filed June 20. 1914. Serial No. 846,403.

the glucose may be elimin Patented Mar. 23, 1915.

medium may be wash syrup, water, steam, or any other of the well known agents or that the separation of the sugar crystals and surrounding syrup can be effected by the application of heated and compressed air or superheated steam with little or no wash syrup resulting from their use. The well washed or cleaned su ar is then melted in water and sweet water mm the carbonation and sulfitation filter ress stations to thick juice consistency. ihis solution is pumped throu h filters or directly to vertical, cylindrical open tanks provided with heating coils and stirrers. Lime is then added, preferably in the form of milk of lime, in the proportion of one-half per cent. or less to two per cent. of the sugar present. The temperature is raised to boiling and the boiling continued until the gas and foam formation ceases and the liquor comes to a quiet and clear boiling. These tanks are may be varied without departing from my invention. Part of the molasses which results from the mixing and washing process is used for mixing the next raw sugar, and

art leaves the process as rest molasses),

he molasses which results from the process after the lime treatment and crystallization which contains little or no trace of lucose is also used for mixing the high a e raw cane sugar and serves by its app ication to reduce the glucose content ofthe resulting ma ma to the lowest possible degree.

he wash syrup is made neutral with lime, I

if it is not so already, and is either boiled by itself to high grade raw sugar which is treated as above, or such low grade raw cane sugar which does not stand much washing on account of its soft grain is melted in the wash syrup and water, made neutral if not so already, and boiled to high grade raw cane sugar which is treated as above.

From the above it will be understood that my process results in a considerable economy of time and materials, doing away with the bone black filtration and furnishes a product comparatively pure and free from certain salts and other impurities which are resent in the products of other processes. lhe removal of the glucose and other soluble impurities by washing before the lime treatment prevents the formation of undesirable salts which would result from the action of the lime on the glucose, etc.; and by following the washing by lime treatment and other refining steps the coloring matter and other impurities which remain are eliminated.

The process permits the manufacture of beet sugar to be combined with the refining of raw cane sugar, using the machinery of the beet sugar houses.

It will also be understood that various modifications of my process as above de scribed may be made without departing from the invention. For instance, various materials and reagents may be employed as equivalents or substitutes for those mentioned, and all such I regard as falling within the scope of my invention.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is-

1. The process of refining raw cane sugar, which process comprises removingwithout chemical change impurities of the syrup surrounding the sugar crystals, and treating at substantially boiling temperature a solution oithe-resulting crystals with a reagent acting to change the impurities originally included in the sugar or stals to material which will be excluded from the crystals upon recrystallization.

2. The process of refining raw cane sugar, which process comprises removing without chemical change impurities of the syrup surrounding the sugar crystals, and treating at substantially boiling temperature a solution of the resulting crystals with lime or its equivalent to change the impurities originally included in the sugar crystals to a material which will be excluded from the crystals upon recrystallization.

3. The process of refining raw cane sugar, which process comprises removing without chemical change impurities of the syrup surrounding the sugar crystals, treating at substantiall boiling temperature a solution of the resu ting crystals with lime or its equivalent to change the character of the impurities ori 'nally included in the sugar crystals, an recrystallizing the sugar from the solution to the exclusion of the changed impurities from the crystals.

4. The process of refining raw sugar, which rocess comprises mechanically removing mm the sugar impurities of the syrup surrounding the sugar crystals, and treating at substantially boiling temperature a solution of the resulting crystals with lime or its equivalent.

5. The process of refining raw sugar, which process comprises wa'shin the sugar to remove glucose and other impurities of the syrup surrounding the sugar crystals, making a solution of the washed crystals, and acting upon the coloring impurities of said solution by treating said solution at substantially oiling temperature with lime or its eqpivalent.

6. he process of refining raw sugar, which process comprises washing the sugar to re-- move impurities of the syrup surrounding the sugar crystals, and then treating at sub-- stantially a boiling temperature a solution of the washed crystals with lime or its equivalent.

7 The process of refining raw cane sugar, which process comprises washing the sugar to remove glucose and other impurities of the syrup surrounding the sugar crystals, making a solution of the washed crystals, and treating said solution at substantially the boiling temperature with lime or its equivalent.

8, The process of refining raw cane sugar, which process comprises washingthe sugar to remove glucose and other impurities of the syrup surrounding the an ar crystals, making a solution of the wasfied crystals, and boiling said solution with lime or its equivalent until the gas and foam formation ceases, and the solution comes to a quiet and clear boil.

9. The process of refining raw cane sugar, which process comprises washing the sugar to remove glucose and other impurities of the syrup surrounding the su ar crystals, making a solution of the we treating said solution at substantial boiling temperature with lime or its equivalent, precipitating the lime, and further purifying or refining the sugar.

10. The process of refining raw cane sugar, which process comprises washing the sugar to remove glucose and other im urities surrounding the sugar crystals, me ting the washed crystals in water and sweet water from carbonation and sulfitation filter press stations to thick juice consistency, and treatin this solution at boiling temperature wit 1 lime or its e uivalent.

11. The process of re ing raw cane sugar, which process comprises washing the y the ed 0 stals,

sugar to remove glucose and other impuri- 12. The process of refining raw cane sugar, which process comprises washing the sugar to remove glucose and other impurities surrounding the sugar crystals, boiling a solution of the washed crystals at thick juice consistency with a small amount of lime, and submitting said solution subsequently to ordinar refining processes as used in beet sugar actories, such as saturation with carbonic acid and sulfurous acid gas or sulfurous acid gas alone with the necessary filtrations and other ordinary beet sugar house refining processes.

13. The process of refining raw cane sugar, which process comprises removing the glucose and other impurities of the syrup surrounding the sugar crystals by washin with wash 5 rup, making a solution of the tieaned crysta s, and treating said solution at substantially theboiling temperature with lime or its equivalent.

14. The process of refining raw cane sugar, which process comprises washing the sugar with steam to remove glucose and other impurities of the syrup surroundin the sugar crystals, making a solution 0 the cleaned crystals, and treating said solution at substantially the boiling temperature with lime or its equivalent.

15. The process of refining raw cane sugar, which process comprises removing the glucose and other impurities of the syrup surrounding the sugar crystals by blowing out with superheated steam to efi'ect a mechanical separation of the sugar crystals and surrounding syrup, making a solution of the cleaned crystals, and treating said solution at substantially the boiling temperature with lime or its equivalent.

16. The process of refining raw cane sugar, which process comprises removing the glucose and other impurities of the syrup surrounding the sugar crystals by blowing out with heated compressed air, making a solution of the cleaned crystals, and treating said solution at substantially the boiling temperature with lime oi its equivalent.

n testimony whereof I affix my signature in presence of two witnesses.

FRANZ MURKE.

Witnesses:

A. L. ROBLING, O. A. HILLER.

It is hereby certified that 'in Letters Patent No. 1,132,868, granted March 23, 1915, upon the application of Franz Murke, of Fort Collins, Colorado, for an improvement in Processes of Refining Raw (Jane-Sugar, an error appears in the printed specification requiring correction as follows: Page.], line 80, the matter beginning with the word From toand including the word invention, same page, line 93, should form a separate paragraph; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 27th day of April, A. D., 1915.

J. T NEWTON,

Acting Commissioner of Patents.

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