Method for decolorizing sugar juice by using water-soluble zinc salt-lime

A water-soluble, zinc salt technology, applied in the purification of sugar juice, sugar production, application and other directions, can solve problems such as less reporting of new zinc hydroxide, and achieve the effects of low cost, high decolorization rate and simple process

Pending Publication Date: 2020-03-24
GUANGXI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few reports on the decolor

Method used

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  • Method for decolorizing sugar juice by using water-soluble zinc salt-lime
  • Method for decolorizing sugar juice by using water-soluble zinc salt-lime
  • Method for decolorizing sugar juice by using water-soluble zinc salt-lime

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1: Take 100 mL of brown granulated sugar reconstituted syrup at 10°Bx in a 250mL beaker, add zinc sulfate to make the zinc ion content 800mg / L, adjust the pH value to 8.0 with milk of lime, and keep stirring at 75°C After 10 minutes, add 2 mg / L of PAM, stand for separation, and obtain a clean juice after flocculation and sedimentation are stable. Take a certain volume of supernatant to adjust the pH to 7.00±0.02, and then filter with an organic filter membrane with a pore size of 0.45 μm. , the absorbance was measured at 560 nm, and the calculated decolorization rate was 81.75%.

Embodiment 2

[0019] Example 2: Take 100 mL of brown granulated sugar reconstituted syrup at 10°Bx in a 250mL beaker, add zinc sulfate to make the zinc ion content 750mg / L, adjust the pH to 8.5 with milk of lime, and keep stirring at 65°C After 10 minutes, add 2 mg / L of PAM, stand for separation, and obtain a clean juice after flocculation and sedimentation are stable. Take a certain volume of supernatant to adjust the pH to 7.00±0.02, and then filter with an organic filter membrane with a pore size of 0.45 μm. , the absorbance was measured at 560 nm, and the calculated decolorization rate was 80.39%.

Embodiment 3

[0020] Example 3: Take 100 mL of brown granulated sugar reconstituted syrup at 10° Bx in a 250 mL beaker, add zinc sulfate to make the zinc ion content 750 mg / L, adjust the pH value to 8.0 with milk of lime, and keep stirring at 70 ° C After 10 minutes, add 2 mg / L of PAM, stand for separation, and obtain a clean juice after flocculation and sedimentation are stable. Take a certain volume of supernatant to adjust the pH to 7.00±0.02, and then filter with an organic filter membrane with a pore size of 0.45 μm. , the absorbance was measured at 560 nm, and the calculated decolorization rate was 80.47%.

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Abstract

The invention relates to a method for decolorizing sugar juice by using water-soluble zinc salt-lime. The specifically steps comprise: adding a water-soluble zinc salt into sugar juice, regulating thepH value by using lime milk, continuously stirring at 65-80 DEG C for 10-30 minutes, adding PAM, carrying out standing separation, and obtaining a clean juice after flocculation sedimentation is stable. According to the method, zinc sulfate (zinc sulfate, zinc chloride or zinc nitrate) is used as an inorganic decolorizing agent, and is subjected to a coagulation reaction under an alkaline condition to generate zinc hydroxide and a calcium salt (calcium sulfate, calcium oxide or calcium nitrate) so as to adsorb or embed the pigment and other non-sugar substances in the sugar juice, wherein thedecolorization rate reaches 81.75%; the process is simple, does not use toxic and harmful substances, and belongs to an environmentally friendly clarification decolorization process; and the principle is that a zinc salt is used as an inorganic decolorizing agent, and is subjected to a coagulation reaction under an alkaline condition to generate zinc hydroxide and a calcium salt so as to adsorb or embed non-sugar substances such as pigments and the like in sugar juice.

Description

technical field [0001] The invention relates to a method for decolorizing sugar juice by a water-soluble zinc salt-lime, and belongs to the field of sugar juice clarification and decolorization. Background technique [0002] The pigment molecules of sugar juice can be divided into two categories: fat-soluble pigments and water-soluble pigments. Fat-soluble pigments are insoluble in water, mainly chlorophyll, lutein and carotene, etc. They are usually mixed with various sucrose in cane juice, covered and protected by protein, and dispersed into suspended particles; water-soluble pigments are mainly various phenols Substances, they have many types, complex changes, and often become darker substances in the production process, which have a great adverse effect on the sugar production process. At present, the clarification and decolorization processes in the sugar industry mainly include the phosphoric acid-lime method, the sulfurous acid method, the carbonic acid method, the a...

Claims

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Application Information

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IPC IPC(8): C13B20/00
CPCC13B20/005
Inventor 李利军程昊李慰霞黄文艺孔红星李彦青冯军杨岚凤
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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