阅读说明：本技术 一种蔗糖晶种及其制备方法 (Sucrose seed crystal and preparation method thereof ) 是由 张平军 莫柳珍 苏慧慧 黎鹏 汤静洁 黄俊生 高俊永 高亚飞 于 2020-07-23 设计创作，主要内容包括：本发明属于制糖工业领域,公开了一种蔗糖晶种及其制备方法。所述制备方法为：将蔗糖溶于水中配置成质量浓度为50％～70％的糖液,然后将此糖液在-10℃～4℃条件下浓缩,得到蔗糖质量浓度为82％～90％的浓缩糖液；将乙醇加入到浓缩糖液中,在超声条件下处理5～120s,然后经过滤、收集和分散保藏,得到蔗糖晶种。本发明方法在低温条件下制备晶种,可避免蔗糖转化,提高晶种质量。所得晶种粒度均匀、晶种表面光滑。有利于降低后续工序处理难度,提高蔗糖结晶产品质量。(The invention belongs to the field of sugar industry, and discloses a sucrose seed crystal and a preparation method thereof. The preparation method comprises the following steps: dissolving sucrose in water to prepare a sugar solution with the mass concentration of 50-70%, and then concentrating the sugar solution at the temperature of-10-4 ℃ to obtain a concentrated sugar solution with the mass concentration of sucrose of 82-90%; adding ethanol into the concentrated sugar solution, treating for 5-120 s under an ultrasonic condition, and then filtering, collecting, dispersing and preserving to obtain the sucrose seed crystal. The method of the invention prepares the seed crystal under the condition of low temperature, can avoid the conversion of sucrose and improve the quality of the seed crystal. The obtained seed crystal has uniform granularity and smooth surface. Is beneficial to reducing the treatment difficulty of the subsequent procedures and improving the quality of the sucrose crystallization product.)

1. A preparation method of sucrose seed crystal is characterized by comprising the following steps:

(1) dissolving sucrose in water to prepare a sugar solution with the mass concentration of 50-70%, and then concentrating the sugar solution at the temperature of-10-4 ℃ to obtain a concentrated sugar solution with the mass concentration of sucrose of 82-90%;

(2) and (2) adding ethanol into the concentrated sugar solution obtained in the step (1), treating for 5-120 s under an ultrasonic condition, and then filtering, collecting and dispersing under a normal temperature condition to obtain the sucrose seed crystal.

2. The method for preparing sucrose seed crystal according to claim 1, wherein: the sucrose in the step (1) is white granulated sugar with the sucrose content of more than or equal to 99.8 percent.

3. The method for preparing sucrose seed crystal according to claim 1, wherein: in the step (2), the mass ratio of the ethanol to the concentrated sugar solution is 1 (0.1-1).

4. The method for preparing sucrose seed crystal according to claim 1, wherein: the ultrasonic condition in the step (2) is that the ultrasonic intensity is 0.1-10W/cm²Ultrasonic frequency 2X 10⁴～2×10⁹Hz。

5. The method for preparing sucrose seed crystal according to claim 1, wherein: in the step (2), the temperature range is 10-40 ℃ under the normal temperature condition.

6. The method for preparing sucrose seed crystal according to claim 1, wherein: the dispersed preservation in the step (2) refers to the preservation of the filtered and collected seed crystals dispersed in an ethanol solution.

7. A sucrose seed crystal characterized by: prepared by the method of any one of claims 1 to 6.

Technical Field

The invention belongs to the field of sugar industry, and particularly relates to a sucrose seed crystal and a preparation method thereof.

Background

White granulated sugar is one of edible sugar, and is a sucrose crystal prepared by taking sugarcane or beet as a raw material and processing the raw material through processes of sugar juice extraction, cleaning treatment, boiling crystallization, honey separation and the like. In the boiling crystallization process, the quality of the seed crystal directly influences the production efficiency and the quality of the product.

At present, in the initial stage of production in the sugar industry, the commonly used seed crystals are mostly prepared by grinding sugar products, and although the seed crystals are easy to obtain, the seed crystals have the following inevitable defects. The crystal seed has large particle size distribution range, a large amount of fine crystals are contained in the crystal seed, the crystal form is uneven, the color forming materials are easy to preserve, the particle size of a crystal product is uneven, the secondary nucleation phenomenon of the crystal seed is serious, the actual crystal seed quantity is difficult to control, the fine crystals in the product are more, and the product is difficult to recover and cause certain loss in the processes of crystallization, boiling and preparation, long time, high energy consumption and separation.

Disclosure of Invention

Aiming at the defects and shortcomings of the prior art, the invention aims to provide a preparation method of sucrose seed crystal.

Another object of the present invention is to provide a sucrose seed crystal prepared by the above method.

The purpose of the invention is realized by the following technical scheme:

a preparation method of sucrose seed crystal comprises the following steps:

(1) sucrose is dissolved in water to prepare sugar solution with the mass concentration of 50-70%, and then the sugar solution is concentrated at the temperature of-10-4 ℃ to obtain concentrated sugar solution with the mass concentration of sucrose of 82-90%.

(2) And (2) adding ethanol into the concentrated sugar solution obtained in the step (1), treating for 5-120 s under an ultrasonic condition, and then filtering, collecting and dispersing under a normal temperature condition to obtain the sucrose seed crystal.

Further, the sucrose in the step (1) is white granulated sugar with the sucrose content of more than or equal to 99.8 percent.

Furthermore, the mass ratio of the added amount of the ethanol to the concentrated sugar solution in the step (2) is 1 (0.1-1).

Further, the ultrasonic condition in the step (2) is ultrasonic intensity of 0.1-10W/cm²Ultrasonic frequency 2X 10⁴～2×10⁹Hz。

Further, the temperature range of the step (2) under the normal temperature condition is 10-40 ℃.

Further, the dispersed preservation in the step (2) means that the filtered and collected seed crystals are dispersed in an ethanol solution for preservation.

A sucrose seed crystal is prepared by the method.

The invention discovers that: under the condition of-10 ℃ to 4 ℃, water is formed into solid ice on the wall surface of the jacket concentration device, and the sucrose solution is not easy to nucleate in a glassy state, so that the aim of obviously improving the sucrose concentration by concentration can be achieved; under the condition of high sucrose concentration, hydrogen bond association structures among sugar molecules are destroyed by adding ethanol solvent for water deprivation and ultrasonic oscillation, so that a large number of sucrose crystal nuclei are promoted to be rapidly precipitated into crystal seeds with uniform sizes and complete surfaces.

The preparation method and the obtained product have the following advantages and beneficial effects:

(1) the invention can obtain the seed crystals with different size distributions by controlling different conditions, and the obtained seed crystals have uniform granularity and smooth surface.

(2) The method for preparing the seed crystal by concentration at low temperature can obviously improve the supersaturation degree of the mother liquor, simultaneously can avoid the conversion of sucrose and improve the quality of the seed crystal.

(3) The seed crystal prepared by the invention is beneficial to reducing the treatment difficulty of the subsequent process, can obviously shorten the boiling time, saves the energy and improves the quality of the sucrose crystallization product.

Drawings

FIG. 1 is a schematic diagram showing the connection configuration of a sucrose seed crystal production system in the example, wherein 1-a sugar solution tank, 2-a jacket concentration device, 3-an ultrasonic treatment device, 4-a centrifugal separation device, 5-a seed crystal collection device, 6-a low-temperature bath, and 7-an ethanol tank.

Fig. 2 is an SEM image of the seed crystal prepared in example 1.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.