JPS61254166A - Regeneration of resin for purifying citrus fruit juice - Google Patents

Abstract

PURPOSE:To save the amount of back-washing water and to enable the stable regeneration of a resin used in the bittern-removal treatment or acid-reducing treatment by the uniform addition of a regeneration agent, by immersing the resin in an aqueous solution of NaOH, and subjecting to the agitation with air and back-washing with water. CONSTITUTION:Circuits fruit juice is subjected to the bittern-removal treatment with a synthetic adsorption resin or the acid-reducing treatment with an anion exchange resin. The used resin is regenerated by discharging the liquid from the column after completing the passing of the liquid, supplying an aqueous solution of NaOh having a concentration of about 3-10% from the surface of the resin layer prior to the agitation with air to effect the impregnation of the solution to the resin and carrying out the agitation with air and the back-washing with water. The resin can be loosened completely, the contamination can be washed out rapidly and a homogeneous resin layer can be reformed. The agitation with air and the back-washing with water are repeated several times to smoothen the regeneration operation compared with the case free from the NaOH impregnation process.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for regenerating a resin used for removing bitterness or reducing acidity from citrus fruit juice.

Conventionally, methods for recycling these resins generally involve the following steps. For example, in the case of synthetic adsorption resin for bittering treatment, 1 liquid flow → liquid extrusion → water removal → air stirring → water backwashing → water removal → air stirring → water backwashing → settling → caustic soda (chemical) injection → extrusion → water removal → hydrochloric acid solution Changing (neutralization treatment) → Air stirring → Water removal → Water backwashing → Washing → Water removal → Fruit juice liquid tension → Liquid passing.

However, the raw fruit juice contains pipes and viscous substances that get entangled with the resin during liquid passage and cause pressure loss.
The ion exchange equipment can be restored by water backwashing alone, as is the case with normal ion exchange equipment regeneration methods, but even if the process of air agitation and water backwashing is repeated twice as described above, the resin tangles cannot be loosened easily. It can easily become a mud ball. When mud balls occur in the resin layer, the flow of the chemical becomes uneven, leading to insufficient regeneration and a decrease in performance. This tendency occurs in purification equipment in which bitterening groups and acid reducing groups are connected separately in series.
Significantly appears during resin regeneration in the first column.

The present invention completely loosens the tangles of the resin caused by the above-mentioned liquid passage when regenerating the purified resin of citrus fruit juice, restores a homogeneous resin layer, and improves the regeneration efficiency by injection and extrusion of chemical solutions. The purpose is to provide a reproduction method.

That is, the regeneration method of the present invention is a method for regenerating a resin used for the bitterness removal treatment using a synthetic adsorption resin or the acid reduction treatment using an anion exchange resin for citrus fruit juice, in which, before the treatment step of injecting chemicals into the resin and extrusion, The method is characterized in that after the resin is infiltrated into a caustic soda solution, air agitation and water backwashing are performed.

The present invention utilizes the fact that pulpy and viscous substances contained in citrus fruit juice that cause resin entanglement are relatively easily dissolved in a caustic soda solution. and about 3~] O% NaOH before air stirring.
Approximately 1. After injecting to the top of OOw and infiltrating it, air agitation and backwashing with water will loosen the resin well and quickly wash away contamination, making it possible to create a homogeneous resin layer. After that, when air agitation and water backwashing are repeated again, the resin becomes clarified much more quickly than in the case without NaOH infiltration, and the resin layer becomes homogeneous, so that regeneration operations after chemical injection can be performed smoothly. become.

Examples are shown below.

Examples Synthetic adsorption resins obtained by removing bitterness from fruit juice stock solutions were regenerated in Examples using the method of the present invention and Comparative Examples using the conventional method described above. As a bittering tower, the tower diameter is 200m.
A column with a height of 700 mm was used, and a synthetic adsorption resin was filled in the column to a height of 350 mm. The results were as shown in the table below.

(Left below) According to the embodiment of the present invention, the resin layer is deposited evenly, so the following chemical injection → extrusion → water removal → hydrochloric acid solution → air stirring → water removal → water backwashing → washing → water removal On the other hand, in the comparative example, that is, when the normal conventional method was used, some lumps remained at the bottom of the resin, which caused the regeneration process to be carried out smoothly and efficiently. This resulted in uneven flow and insufficient regeneration.

Examples of the effects of the present invention as described above are as follows.

■ Stable regeneration is possible by uniform chemical injection.

◎The amount of backwash water for pre-regeneration treatment can be saved by about 30%. The caustic soda added before θ can be used for chemical injection, so there is no need to increase the amount of chemicals, and there is almost no increase in equipment costs.

By reducing the amount of O backwash water, the regeneration time can also be slightly shortened.

Claims (1)

[Claims] 1. In a method for regenerating a resin used for de-bitterness treatment of citrus fruit juice using a synthetic adsorption resin or acid reduction treatment using an anion exchange resin, the resin is treated with caustic soda before the treatment step of injecting chemicals into the resin and extrusion. A method for regenerating citrus juice purification resin, which comprises performing air agitation and water backwashing after soaking in a liquid.