阅读说明：本技术 甜菜糖蜜的脱钙方法 (Decalcification method of beet molasses ) 是由 邹传军 于 2020-12-08 设计创作，主要内容包括：本发明公开了一种甜菜糖蜜的脱钙方法,向甜菜糖蜜中添加草酸溶液/草酸固体进行脱钙处理且保持pH值为6-8,反应时草酸与钙离子结合,形成非常稳定的草酸钙沉淀,过滤得到脱钙的甜菜糖蜜。本发明的方法采用草酸与氢氧化钠脱除甜菜糖蜜的钙离子,形成非常稳定的草酸钙沉淀,化学品的添加量小,产生的沉淀容易去除,不影响糖蜜的PH值,技术简单,对设备的材料腐蚀小。(The invention discloses a method for decalcifying beet molasses, which comprises the steps of adding oxalic acid solution/oxalic acid solid into beet molasses, decalcifying, keeping the pH value at 6-8, combining oxalic acid with calcium ions during reaction to form very stable calcium oxalate precipitate, and filtering to obtain the decalcified beet molasses. The method adopts oxalic acid and sodium hydroxide to remove calcium ions in the beet molasses to form very stable calcium oxalate precipitate, has small addition amount of chemicals, easily removes the generated precipitate, does not influence the PH value of the molasses, has simple technology and little corrosion to materials of equipment.)

1. A method for decalcifying beet molasses, characterized in that: adding oxalic acid solution/oxalic acid solid into beet molasses, decalcifying while maintaining pH at 6-8, reacting while combining oxalic acid with calcium ion to form stable calcium oxalate precipitate, and filtering to obtain decalcified beet molasses.

2. The process for decalcification of beet molasses according to claim 1, wherein: the pH regulator for maintaining the pH value is sodium hydroxide solution, and the concentration of the sodium hydroxide solution is 3-80%.

3. The process for decalcification of beet molasses according to claim 1, wherein: the concentration of the oxalic acid solution is 1-30%, or oxalic acid is directly added.

Technical Field

The invention relates to the field of beet molasses processing, in particular to a method for decalcifying beet molasses.

Background

Beet molasses is one of the by-products of the beet sugar industry. In the sugar preparation process, after sugar liquid is concentrated to separate out crystal sugar, brown viscous liquid is remained. The main component of beet molasses is sugar, and the sugar content is almost all sucrose, about 60%. The molasses has high mineral content of about 8-10%, wherein the content of potassium, sodium and calcium ions is high. The main application of beet molasses is to ferment and produce yeast or alcohol, and can also adopt chromatographic separation technology to extract sucrose contained in molasses. The chromatographic separation technology utilizes components of molasses, the binding force of the components in chromatographic separation resin is different, and when the molasses flows through the chromatographic separation resin, the components pass through the chromatographic separation resin at different speeds and flow out of an outlet in sequence to obtain different components. The usual chromatographic resins are strong acid cation resins in the sodium (potassium) form, which require molasses with a very low calcium content, usually below 500 ppm. The calcium content of beet molasses is above 2000 ppm.

In order to reduce the calcium content, the currently adopted method is that sodium carbonate is added to generate calcium carbonate precipitation, the calcium carbonate forms stable precipitation, the pH is generally required to reach above 9.5, after the precipitation is generated, the calcium carbonate precipitation needs to be filtered firstly to remove, the pH of molasses is too high, the separation is affected, and the quality of sugar liquor obtained by separation is affected, so the pH needs to be reduced to about 7, hydrochloric acid needs to be added, and the pH is reduced to a proper level. In the whole process, the addition amount of chemicals is large, the process is complex, and the corrosion of common hydrochloric acid to equipment is serious.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a decalcification method for beet molasses, which has the advantages of simple operation, strong practicability and low cost.

In order to achieve the above object, the present invention relates to a method for decalcifying beet molasses, wherein oxalic acid solution/oxalic acid solid is added into beet molasses to perform decalcifying treatment while keeping pH 6-8, oxalic acid is combined with calcium ions during the reaction to form a very stable calcium oxalate precipitate (the precipitate is not affected by the pH value of molasses), and the decalcified beet molasses is obtained by filtration.

Further, the pH regulator for maintaining the pH value is sodium hydroxide solution, and the concentration of the sodium hydroxide solution is 3-80%

Still further, it is characterized in that: the concentration of the oxalic acid solution is 1-30%.

The invention has the beneficial effects that:

the method adopts oxalic acid and sodium hydroxide to remove calcium ions in the beet molasses to form very stable calcium oxalate precipitate, has small addition amount of chemicals, easily removes the generated precipitate, does not influence the PH value of the molasses, has simple technology and little corrosion to materials of equipment.

Detailed Description

The present invention is described in further detail below with reference to specific examples so as to be understood by those skilled in the art.

Example 1

A process for decalcifying beet molasses by adding 1% strength oxalic acid solution/oxalic acid solid to beet molasses, maintaining pH at 6-8, reacting while combining oxalic acid with calcium ion to form stable calcium oxalate precipitate independent of molasses pH, and filtering to obtain decalcified beet molasses, wherein the pH regulator is sodium hydroxide solution with sodium hydroxide solution concentration of 80%.

Example 2

A process for decalcifying beet molasses by adding 30% strength oxalic acid solution/oxalic acid solid to beet molasses, maintaining pH at 6-8, reacting while combining oxalic acid with calcium ion to form stable calcium oxalate precipitate independent of molasses pH, and filtering to obtain decalcified beet molasses, wherein the pH regulator is sodium hydroxide solution and the sodium hydroxide solution has a concentration of 3%.

Example 3

A process for decalcifying beet molasses by adding 15% strength oxalic acid solution/oxalic acid solid to beet molasses, maintaining pH at 6-8, reacting while combining oxalic acid with calcium ion to form stable calcium oxalate precipitate independent of molasses pH, and filtering to obtain decalcified beet molasses, wherein the pH regulator is sodium hydroxide solution and the concentration of sodium hydroxide solution is 40%.

Other parts not described in detail are prior art. Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.