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Crystallization of sugars

a sugar and crystallization technology, applied in the field of crystallization of sugars, can solve the problems of unstable and hygroscopic final maltose product, difficult crystallization of sugars, and distortion of crystal shap

Inactive Publication Date: 2005-09-29
DANISCO SWEETENERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crystallization of sugars, however, is in many cases difficult due to the presence of so-called crystallization inhibitors.
The presence of crystallization inhibitors retards the crystallization process and leads to distortions in the crystal shape.
Maltotriose has a tendency to make the final maltose product unstable and hygroscopic.
Maltotriose may also disturb the crystallization of maltose and maltitol.
Maltotritol also disturbs the crystallization of maltitol.
Even in this process, the resulting glucose / maltose syrup is not free from impurities, such as maltotriose.
However, the use of nanofiltration, enzymatic hydrolysis and / or chromatography for removing crystallization inhibitors from sugar solutions comprising reducing sugars, especially monosaccharides, has not been disclosed or suggested in the state of the art.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Nanofiltration of a Spent Sulphite Pulping Liquor to Purify Xylose from Xylose Crystallization Inhibitors

[0123] The liquor to be treated was a Mg-based sulphite spent pulping liquor obtained from beechwood pulping. The spentliquor had been pretreated by ultrafiltration. The nanofiltration was carried out at a pressure of 30 bar, a temperature of 35° C. and a pH of 5.3). The nanofiltration membranes were Desal-5 DK, Desal-5 DL and NF 200.

[0124] The nanofiltration results are presented in Table I.

TABLE IXylose inXylose in permeate, % on DSDS in feed, %feed, % on DSDesal-5DKDesal-5 DLNF 2005.633.231264210.332.542356018.529.8696564

[0125] The contents of other carbohydrates (in addition to xylose), oligosaccharides, xylonic acid, metal cations (Ca2+and Mg2 +) as well as sulphite and sulphate ions were analyzed from samples taken from a concentration mode ultrafiltration (DS4) at three different concentrations (the feed samples) and from the corresponding permeates obtained from nanof...

example 2

[0130] (A) Nanofiltration of Spent Liquor in Pilot Scale

[0131] 340 kg of Mg-based sulphite spent pulping liquor was diluted with water to give 1600 l of a solution with DS of 17%. The pH of the solution was adjusted with MgO from pH 2.6 to pH 5.4. The solution was filtered with Seitz filter using 4 kg of Arbocell® as filtering aid. Nanofiltration was carried using an equipment with Desal 5 DK3840 modules and an inlet pressure of 35 bar at 45° C. The nanofiltration permeate containing xylose was collected into a container until the flux of the permeate was reduced to a value below 10 l / m2 / h. The collected permeate (780 l) was concentrated with an evaporator to 13.50 kg of a solution with DS of 64%. Table IIb presents the composition of the feed and the permeate. The contents of carbohydrates, acids and ions are expressed in % on DS.

TABLE IIbFeedPermeatepH5.05.2DS, g / 100 g17.364.5Oligosaccharides,0.60.02% on DSXylose12.564.8Glucose1.93.2Galactose + rhamnose1.22.3Arabinose + mannose...

example 3

Nanofiltration of a Xylose Fraction Obtained from Chromatographic Separation, Followed by Crystallization of the Xylose-Containing Nanofiltration Permeate

[0138] (A) Chromatographic Separation

[0139] Sulphite cooking liquor from a Mg2+based cooking process was subjected to a chromatographic separation process with the aim to separate xylose therefrom.

[0140] The equipment used for the chromatographic separation included four columns connected in series, a feed pump, circulation pumps, an eluent water pump as well as inlet and product valves for the various process streams. The height of each column was 2.9 m and each column had a diameter of 0.2 m. The columns were packed with a strong acid gel type ion exchange resin (Finex CS13GC) in Mg2+form. The average bead size was 0.36 mm and the divinylbenzene content was 6.5%.

[0141] The sulphite cooking liquor was filtered using diatomaceous earth and diluted to a concentration of 48% by weight. The pH of the liquor was 3.3. The sulphite c...

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Abstract

The invention relates to removing crystallization inhibitors from a solution comprising one or more reducing sugars by nanofiltration, hydrolysis and / or chromatography. The reducing sugars are typically selected from fructose and xylose.

Description

BACKGROUND OF THE INVENTION [0001] The invention relates to the crystallization of sugars and especially to the treatment of sugar solutions for crystallization with the aim to purify sugar solutions from crystallization inhibitors. In connection with the present invention, the sugars are especially reducing sugars. [0002] In the sugar industry, crystalline sugar products are especially desirable end products. The crystallization of sugars, however, is in many cases difficult due to the presence of so-called crystallization inhibitors. The crystallization inhibitors comprise various by-products formed in sugar solutions in the sugar-processing steps preceding the crystallization, such as during the hydrolysis of the raw material, during the sugar-inversion stage and during the concentration and / or evaporation stages relating to the recovery of the desired sugars. [0003] It is generally known in the art of sugar crystallization that crystallization inhibitors disturb the crystallizat...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01D15/36C13B20/12C13B20/14C13B20/16C13B30/02C13B35/06C13K11/00C13K13/00
CPCB01D15/362B01D15/363C13B20/12C13K13/002C13B30/02C13K11/00C13B20/165B01D9/02C13K7/00
Inventor KOIVIKKO, HANNUKAARTO, MINNAHEIKKILA, HEIKKILINDROOS, MIRJANURMI, JUHA
Owner DANISCO SWEETENERS
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