US1066397A - Process and contrivance for production particularly of sugar-crystals in vacuum. - Google Patents

Description

0. FROMM & M. SGHODLY.

PROCESS AND GONTRIVANOE FOR PRODUCTION PARTICULARLY 0F SUGAR CRYSTALS IN VACUUM. APPLIOATION PILEDDEO. 10, 1912.

1,066,397 Patented July 1, 1913.

L-- H 1 V J) z B Trifle/272713:

UNITED scrarns PATENT OFFICE.

TTO EROMM, AfND MATHIAS SCHODLY, OF SCHWARTAU, NEAR Ll' ElBEGK, GERMANY.

PROCES$ AND GQNTRIVANCE F03, PRODUCTIQN PARTICULARLY SUGAR-CRYSTALS IN VACUUM.

Patented July1,1913.

Application filed December 10,.1591-2. Serialiblo. 736,032..

To all whom it may concern:

Be it known that we, O'r'ro FROM-M- and MGMATHEIAS SorroDLY, subjects of the German- II" with the usual vacuum apparatus the syrup was boiled until concentrated for the forma tion. of grains. The turning out of crystals of an equal size was however very difiicult, because the process can only be carried out so long as the apparatus is in cooking opera tion, whereupon on the stopping of the vacuum, must be emptied or filled up. Now

as a rule the emptyingof the apparatus 00- curs exactly at the time of the grain formation, so that only a proportionally small grain is produced. The mass or finished boiling is now conducted in a. mash in which it rests for some days, the so called crystallizing out, and for the purpose of separation of the syrup fom the sugar crystals-it is put into a centrifugal machine.

The above given working process loses time and heat and requires for its technical execution'large apparatus and produces only a proportionally small ain, because the increasing of the same 1s interrupted and disturbed before being finished, during the periodic filling of the apparatus.

' The new workin process, according to the invention herewit 1 develops an uninterrupted production of the sugar crystals, which only arrive then to be thrown oif when they have reached an equal volume, durin which the small crystals are thrown back into .the apparatus for further growing. In order to be able to carry out this technically, a special installation is neces sary, an exam le of which is represented, in the sketch an shows:

Figure 1. a side view and Fig. 2. a plan, both views show part sections.

A is the vacuum a paratus in which are one or more heaters in the last case they .canbe arranged above one another or :against one another. In the under conical part of the apparatus A is led a tube conductor B, which is connected with an exhaust and pressure pump F, and which carries a drainingcock G, as well as a valve D. l From the pump F is led a further tube B into a reservoir: E built in the upper part of the apparatus A, inwhich is laid out an inclined sievedv gutter H, in which is provided a conical helical gear J. At the end of the reservoir E in the lower part of the draining apparatus is fitted a gutter-pipe, G which is provided with a suitable valve.

a The mode of operation of the. arrangement as described, is as follows: The solution containing sugar as syrup or so on, isdelivered through an inlet A into the evaporator A, which, with its combined tube conductors B, B and G and the reservoir E are junder a Vacuum. The cooking of the solution next follows as in every other vacuum apparatus until the same is evaporated andthe small crystals appear. To this mass, which commences to cook, is then added a further quantity of solution until the size of 'the sugar crystals increases, and till a great quantity of crystals is stored in lower part of the apparatus A.

The useful effect of the apparatus can be increased thereby and the duration of the operation be shortened, if several burners are fitted above one another in the apparatus in order to have the great-est possible evaporating surface and to reach an equalization of temperature between hot steam and the mass being treated.

If the mass is now fully cooked and under the action of the newly added diluted solution great numbers of crystals willhave settled on the already steamed mass, then the valve D is opened and the thick mass, as far as the same has entered into the crys tallizing state, is sucked through the, tube conductor B by means of the pump and always under vacuum, drawn through the pipe B into the reservoir E. The mass which is composed of small and lar e grains as well as molten liquor brought with same, now falls into the sieved .gutter H where it is held by the helical gear J and is transported in the rising gutter H under,the infiuence of the sugar/solution, water and so on, and the steam rising from the apparatus. Now with this ,.transportation the fine crystals becolne separated from the mass and return through the sieved gutter H into the apparatus for further increasing, while the large crystals on the end of the gutter get into the gutter pipe G and from here are led for further working in the known manner in the mash, centrifugal machine, etc. Through the circulation with the mass of not yet fully formed crystals, the formation of the crystals is favorably influenced in the molten syrup while a storing' of the separation is effected in this crystallized mass.

The leading thought of this invention is based on the idea that only large sized crystals are separated, small, and distilled unformed crystals are led again for further growing, to the mixed molten-liquor, in a circulation under vacuum,

A complete emptying of the apparatus is done through the cock C.

What We claim is:

1. A process for the production of sugar or other crystals by subjecting the sugar or like solution under vacuum influence to heat, and when by evaporation crystals are formed drawing off and straining the mass to separate the larger crystals from the liquid and smaller crystals, again passing the liquid and small crystals through the evaporating zone and the straining operation as before, each step in the process being in vacuo.

2. A process for the production of sugar or other crystals by subjecting the sugar or like solution under vacuum influence to heat, and when by evaporation crystals are formed, adding more liquid, then drawing oil and straining the mass to separate the larger crystals from the liquid and smaller crystals, again passing the liquid and small 1 crystals through the evaporating zone and the straining operation as before, all of the steps in the process being in vacuo.

' 3. Apparatus for working a process for the production of crystals comprising a conveyer in said strainer, an outlet to re-.

ceive the fully formed crystals and means to connect with operative power.

4. In apparatus for carrying out a process for granulating sugar and other substances a vacuum evaporator to hold the solution, valve guarded inlet and outlet ports in said evaporator, means for heating said solution,

a valued tube leading from the outlet of said evaporator to a force pump, a strainer, a tube connecting said pump to said straine a conical helical conveyer in said strainer, means to remove the larger crystals from the apparatus and means to force the mass of liquid and small crystals into said evapov rator again.

- In testimony whereof We afiix our signatures in the presence of two witnesses.

OTTO FROMM. MATHIAS SCHODLY, lVitnesses WILHELM GRAEFE, JOHN WULF.

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