DD296704A5 - PROCESS FOR CLEANING EXTRACTED DUST INSERTION WITHOUT AID - Google Patents

Abstract

The invention relates to the purification of extracted date juice without auxiliaries. According to the invention, the purification and clear filtration of the extracted date juice is carried out at a pressure of * MPa and a temperature of 30-70 ° C in a process stage using ultrafiltration membranes. The membranes used are made of different raw materials and (depending on the quality of the pretreatment) have a cut limit of 5,000-50,000 daltons. The cleaning process is carried out at the specified parameters without any pectin-splitting and filtration auxiliaries. The filtrate is pectin-free and of clear purity and can be used in the later stages of sugar production. extracted date juice; Entpektinieren; Clear filters; Ultrafilter membrane; sized capillaries}

Description

For this 2 pages drawings

Field of application of the invention

The invention relates to a process for the purification of extracted date juice without auxiliary agents. Characteristic of the known state of the art The sensitive steps of making sugar beet are the depigmenting and clear filtering of the pressed and

extracted, rather contaminated sugar solution with high pectin content.

It is well known that the sugar solution with a high pectin content in a suitable reactor with the aid of

pectin-splitting enzymes (Röhm, Grinstedt-make) degraded and then after the corresponding residence time the

Solution of frame filter presses using filter aids (bentonite or perlite) is filtered approximately clear. The enzymatic degradation requires a large amount of pectin-splitting enzymes, this is about 0.1-0.3% to

treating sugar solution.

For the function of the enzymes is a temperature of 45-50 ° C and a very accurately measured optimal enzyme concentration

necessary, otherwise there is no complete degradation, the solution remains contaminated by pectin or the degradation enzymes lose their activity.

From these statements, it is clear that pectin cleavage is the most expensive and sensitive process in the The production of sugar is the quality of the dessert sugar that is the final product. In other methods, for. B. according to the Hungarian patent no. 165076, the pectin cleavage takes place with the so-called Kalkmethode. In these cases, the pectin is precipitated in the form of calcium pectate, then the excess liquor with Carbonic acid is neutralized and adjusted to the appropriate pH. A big problem arises as a result of the lime treatment

in the solution forming high cation and anion content, as this significantly increases the burden of required for the sugar production of the ion exchange columns and thus also the consumption of the resin and parallel to the

Production costs increase. After the pectin cleavage by lime is also carried out using the aforementioned auxiliaries Frame filtration or vacuum drum filtration required. Object of the invention The aim of the invention is to reduce the costs of the sugar production. Explanation of the essence of the invention

The invention has for its object to perform the Entpektinieren and clear filtration in one step, without the use of excipients.

To solve this problem, according to the invention, the sugar extract solution coming from the extractor arrives in a common collecting container, where it reaches the containers of the individual ultrafilter module rows with the aid of a pump. The ultrafilters modules filter the Dattelzuckerlösung in adaptation to the needs of the complete Dattelzuckerproduktionsreihe in a periodic or continuous or single-stage or cascade system by the Filtrierparameter to values of 0,1-1,0MPa pressure and 30-70 are set ⁰ C temperature , As a cut-off limit of the synthetic ultrafilter membranes of capillary form (hollow fiber) or in the form of dimensioned tubes, depending on the pretreatment of the dates, a value of between 5000 and 50,000 daltons is to be selected has a clear purity The 3-5% pectin-rich concentrate produced in the process can be returned to the starting point of the process, coarsely processed or used for other purposes.

In the process no pectin-splitting enzymes and other filter aids are used and none are added to the Technology of pectin cleavage required items and control units or for conventional technologies

indispensable frame presses or vacuum drum filters operated.

The inventive method replaces the conventional two- or multi-stage processes (systems of pectin-splitting Reactor and filter) of the defecting by an operation step. In the on the inventive method

based cleaning of the extracted date juice, the 20-30% sugar loss occurring during the decompactation with lime can be completely eliminated, since the membrane filtration applied does not affect the pH.

The capacity of the efficiency of the production of sugar production can strongly influence ion exchange columns

are protected, since according to the invention no foreign ions enter the solution. The membrane filtrate of the date juice extracted by the technology of the present invention is colloid and more favorable in terms of dye content than the conventional methods.

embodiment The principle scheme and the developed process of the multi-stage ultrafiltration device according to the invention are

shown in Figure 1.

The extracted date juice then enters the common container (T) by means of a pump into the unit container (1-n). The

to be treated solution passes to the pressure booster · and circulation pump on the ultrafilter module rows (I-N), where with the parameters already specified, the Entpektinisierung and the clear filtration takes place.

The pectin-free and clear date sugar solution reaches the ion exchange system after appropriate control (A). FIG. 2 shows the place of the ultrafiltration unit in the sugar production scheme. example

In the inventive process the extracted Dattelsart was purified for 6 hours at 55 ⁰ C and containing a pressure of 0,25MPa in a "batchmode'-Ultrafiltrier-capillary membrane Ultrafiltriervorrichtung. In the ultrafiltration device, POROFILT UFTA-PSF-10-1,2 type modules were used. The cut-off limit of the membranes was 10,000 daltons

 The filtrate was pectin-free and of clear purity. This was controlled by enzyme assay and turbidity tests.

Claims (3)

1. A method for cleaning extracted date juice without aids, preferably for depigmenting and clear filtering, characterized in that the extracted date juice-without the use of pectin-splitting and filter aids - on an ultrafiltration membranes of different raw materials and with a quality of the pretreatment dependent cut limit of 5000 Filtration process is carried out at a pressure of 0.1-1.0 MPa and a temperature of 30-70 ⁰ C in a process stage. 2. The method according to claim 1, characterized in that preferably used as the ultrafiltration membrane sized tubes or capillaries. 3. The method according to claim 1, characterized in that the ultrafiltration - adapted to the needs of the complete Dateraufarbeitungsreihe-in periodic and / or continuous or in single-stage or cascade operation.