Sugar – starch – and carbohydrates – Processes – Carbohydrate manufacture and refining
Patent
1995-05-31
1997-10-07
Caldarola, Glenn A.
Sugar, starch, and carbohydrates
Processes
Carbohydrate manufacture and refining
127 53, 127 56, 127 67, 127 69, 127 71, C08B 3000, B01D 1500, C13D 312, C13F 106
Patent
active
056743220
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to a process for centrifugal treatment of a starch-containing suspension which additionally contains dissolved and undissolved substances, with a separation of the suspension into a concentrate rich in starch and a fraction deficient in starch being effected in a centrifuge with admixture of washing liquid.
Such a method is known for example from the DE 23 23 248 C3. The starch-containing suspension is recovered through decomposition of plant-based raw material such as e.g. potatoes, tapioca, wheat and corn. An objective is the production of a pure starch at minimum expenditure on machines, energy, operational substances and auxiliary substances. The dissolved and undissolved substances contained in the suspension must be separated from the starch and recovered as by-product or disposed as waste water. Respective processes were developed in this regard which are very cost-intensive.
In the known process, the starch-containing suspension is separated in a multistage-staged centrifugal station with admixture of washing liquid into a pure starch concentrate and a liquid phase which primarily contains dissolved and undissolved substances. The washing liquid is conducted preferably in counterflow, i.e. it is supplied to the last centrifugal stage and the separated liquid phase is supplied as washing liquid to the respectively preceding centrifugal stage. The liquid phase is enriched thereby with dissolved and undissolved substances and is withdrawn from the first centrifugal station for further treatment. To increase the effectiveness of the washing process, the centrifuges may be provided with a washing unit through which the washing fluid is conducted directly to the starch concentrate still retained in the centrifuge.
The invention is based upon the object to create a process by which the effectiveness of the washing operation is increased and the costs for processing the liquid phase are reduced.
This object is attained by dividing the starch-deficient fraction in the centrifuge in a first liquid phase containing primarily dissolved substances and into a second liquid phase containing primarily undissolved substances, with the first liquid phase being fed as washing liquid to a preceding centrifuge.
Since the first liquid phase contains no or only few obstructive undissolved substances, is in particular suitable as washing liquid because the effectiveness of the washing process is improved thereby. Also the disposal of this liquid phase after carrying out the washing process is significantly facilitated in view of the removed undissolved substances.
The second liquid phase with the undissolved substances such as e.g. fibers, cell fragments, gluten particles and slimy substances is produced at a higher concentration compared to known processes because the fraction of the first liquid phase is omitted. Thus, the processing of this phase requires less energy and less cumbersome machinery.
Advantageous embodiments of the invention are reflected in the dependent claims.
For carrying out the process, a centrifuge is suitable which enables a classification of the solids contained in the suspension and their separate discharge from the centrifuge is possible. Such a centrifuge is described for example in the not pre-published DE-P 43 22 415.6. However, also other separating devices, like e.g. cyclones, for carrying out the process are suitable.
Exemplified embodiments of the invention are schematically illustrated in the drawing and will now be described in more detail.
FIG. 1 shows a one-step centrifugal treatment,
FIG. 2 shows a two-step centrifugal treatment,
FIG. 3 shows a three-step centrifugal treatment,
FIG. 4 shows a centrifuge for carrying out the process.
A" designates in FIG. 1 the centrifuge in which a starch-containing suspension 1 is separated into a concentrate 2 rich on starch, a first liquid phase 3 containing dissolved substances and a second liquid phase 4 containing the undissolved substances. Washing liquid 5 is conducted via a not shown washing unit into the centri
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Caldarola Glenn A.
Feiereisen Henry M.
Hailey Patricia L.
Westfalia Separator AG
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