KR790000994B1 - Removing method of calcium compounds from molasses - Google Patents

Abstract

Calcium compds. were removed by precipitation with sulfuric acid from molasses. Thus, molasses 1 k1 diluted with water 0.93Kl, heated at 60-80≰C and adjusted to pH 2.5-4.0 with sulfuric acid, were placed for an hr. and centrifuged with high speed centrifuger to remove precipitation of calcium sulfate.

Description

How to remove calcium from molasses

The present invention relates to a method of removing calcium after heating and acidifying calcium (Ca∥) of molasses, wherein molasses contains a large amount of high molecular weight organic non-sugars, colloidal inorganic salts, and the like. Carbohydrate raw materials are widely used in fermentation industry such as fermentation and alcohol fermentation.

Looking at the composition of molasses,

Moisture 16-20%

53.0-62.0% Sugars of Organic Ingredients

Non-saccharide 10-1%

Inorganic Components 8.0-11.5%

Calcium oxide (Ca ≠) is contained in the form of calcium oxide, 0.6-1.5%, this calcium slows down the formation of glutamic acid crystals in the anti-neutralization process using hydrochloric acid in the glutamine phase purification process, and this yield is reduced There are various conventional methods such as physical method, physicochemical method, chemical method and mechanical method to remove the physical method. The physical method is heated and precipitated in gelatinous state, and the physical and chemical method is used to remove acid and alkali after heating. The precipitate is removed by chemical addition, and the chemical method is to remove the precipitate by adding precipitants such as lime, sodium silicate and aluminum sulfate. The mechanical method is by physical action. However, these methods can remove large amounts of inorganic salts contained in molasses. Therefore, the inorganic components necessary for fermentation are removed more than necessary, so the work of adding inorganic materials is necessary again, and it is not only difficult to continuously work, but also has low defects in calcium removal rate and high sugar loss in sediment treatment.

In order to solve the above-described drawbacks, the molasses is diluted to 20-40% and then heated to 60-80 ° C to add calcium oxide contained in molasses to pH 2.5-4.0 with sulfuric acid and left for 1-2 hours. To precipitate calcium sulfate and remove it with a high-speed centrifuge.

Briefly describing the process of the present invention, the molasses is diluted to 20-40%, then heated to 60-80 ℃, added to pH 2.5-4.0 with sulfuric acid, left for 1-2 hours and then separated by a high-speed centrifuge and sterilizer After sterilization, it is put into fermentation nutrient source in fermenter. The fermentation broth is added to hydrochloric acid at pH 3.2 in a semi-neutralization tank and then purified. If the heating temperature is higher than 80 ℃ during preparation in the decalcification process, the risk of breaking molasses increases, and the amount of sediment increases, sugar loss occurs during separation. If the temperature is lower than 60 ℃, the viscosity becomes high and difficult to transfer. little. Therefore, 60-80 ℃ is optimal, and the reason to make pH 2.5-4.0 with sulfuric acid is that a small amount of calcium precipitate occurs when pH 4.0 or higher, and molasses is carbonized and loss occurs when pH 2.5 or lower, so conditions of pH 2.5-4.0 Is the best time.

Therefore, the fermentation broth removed by the present invention can be used instead of hydrochloric acid which is a shortage phenomenon in the use of acid required for anti-neutralization in the purification process. However, if sulfuric acid without calcium is used, calcium sulfate is generated in the refining process, which causes a failure in crystal work. Therefore, if the calcium in molasses is removed before fermentation, sulfuric acid can be used instead of hydrochloric acid in the purification process, thereby reducing the cost and increasing the purification yield. In addition, if the pH and temperature are adjusted to the above conditions, it is a new method that does not need to add the inorganic material again.

Example 1

Philippine molasses (58% sugar or brown algae solution Ca ∥6mg / g) was added to 0.931kℓ of water per 1l of molasses in a continuous process and heated to 80 ° C, and 85% sulfuric acid was added to 15 kg per ton of molasses to pH 3.0. After leaving for an hour and a half, the mixture was separated by a high-speed centrifuge to produce 7.5 kg of calcium sulfate precipitate. Sediment removal rate is 0.6%, the following table is a comparison table of the experimental results of the present invention and Japanese Patent No. 31-3360.

[table]

Cited invention (Japanese Patent No. 31-3360) dilutes molasses to near B × 55, heats it to 60 ° C., adds 0.05-0.5% phosphate cleaner [Ca (H ₂ PO ₄ )] 2, and adds 0.1% quicklime. Use of precipitating agent, in this case, removes inorganic salts from molasses, so inorganic salts must be added again (in case of molasses fermentation)

The present invention can remove more than 70% of the calcium in molasses, and there is almost no discharge of other inorganic salts in the precipitate, so it is not necessary to add the inorganic salts during fermentation culture separately.

Claims (1)

The method for removing calcium from molasses, characterized in that the molasses of molasses diluted to 20-40% as described above in the molasses is heated to 60-80 ℃ and then added to pH 2.5-4.0 with sulfuric acid.