JPS5950304B2 - Citrus juice purification equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a purification device that removes sourness and bitterness from citrus fruit juice to produce fruit juice with a desired taste.

In recent years, as a countermeasure against the overproduction of citrus fruits such as Natsukan, fruit juice has been processed and used, but as the raw fruit juice contains sour and bitter components, it is difficult to make fruit juice that is easy to drink. It is necessary to reduce the amount of interference of these components.

However, in order to make fruit juice with high commercial value, sourness, bitterness, or sweetness must be present in a certain proportion.9 The present inventors discovered that the main component of sourness is citric acid;
In addition, we focused on the fact that the main components of bitterness are naringin and limonin, and in order to reduce these sourness and bitterness components by a certain amount, we used an anion exchange resin to remove sourness and a synthetic adsorbent to remove bitterness. (high porous polymer) and by passing the fruit juice stock solution in an upward flow at a predetermined ratio through these anion exchange resin layers and synthetic adsorbent layers, it was discovered that fruit juice with a desired taste can be obtained, and the present invention is based on the present invention. I came to do this.

That is, the citrus fruit juice purification apparatus of the present invention includes a purification tower that includes an anion exchange resin layer and a synthetic adsorbent layer in the tower, and supplies the fruit juice stock solution below the anion exchange resin layer and the synthetic adsorbent layer, respectively. It is configured to further supply the liquid that has passed through the anion exchange resin layer to the lower part of the synthetic adsorbent layer. is supplied at a predetermined ratio below the anion exchange resin layer and the synthetic adsorbent layer, and while the fruit juice concentrate passes through these layers as an upward flow, the sour components are absorbed by the anion exchange resin layer, and the bitter components are absorbed by the synthetic adsorbent. It is adsorbed by the layer and purified.

Note that the fruit juice stock solution contains insoluble solids such as ash and pulp, but in the present invention, the fruit juice stock solution is supplied below the anion exchange resin layer and the synthetic adsorbent layer and passes upward through these layers. This prevents clogging of each layer due to insoluble solids.

The attached drawings show an example of a purification apparatus according to the present invention.

In the figure, in the purification column 1, there is a synthetic adsorbent layer 2 with a relatively low specific gravity in the upper layer, and an anion exchange resin layer with a higher specific gravity than the synthetic adsorbent layer in the lower layer of this synthetic adsorbent layer 2. 3 is built-in.

It is preferable that the synthetic adsorbent and anion exchange resin in each layer be filled in a quantitative ratio of 1/1 to 3/1.

An intermediate water pipe 4 is provided near the interface between the synthetic adsorbent layer 2 and the anion exchange resin layer 3.

The lower end of the purification tower 1 and the intermediate water sprinkler pipe 4 are provided with a stock solution supply means for supplying the fruit juice stock solution.

This stock solution supply means supplies the fruit juice stock solution in the stock solution tank 5 to lines 7 and 8 which are branched by a pump 6 to valves 9 and 1.
Adjust the opening degree of 0 to a predetermined ratio, for example, 70 to line 7.
%, and into line 8, the stock solution is poured into the synthetic adsorbent layer 2 from the lower end of the tower 1, through the juice container 11, through the lower part of the anion exchange resin layer 3 and through the intermediate liquid collection plate 4. It can be supplied downward.

In this way, the fruit juice stock solution supplied below the anion exchange resin layer 3 passes through the anion exchange resin layer 3 as an upward flow, while the anion exchange resin adsorbs and removes citric acid, which is the main component of sourness. Then, while moving up the synthetic adsorbent layer 2, the main components of bitterness, naringin and limonin, are adsorbed and removed by the synthetic adsorbent.

On the other hand, while the fruit juice stock solution supplied downward to the synthetic adsorbent layer 2 passes through the synthetic adsorbent layer 2 as an upward flow, the main components of bitterness, naringin and limonin, are adsorbed and removed by the synthetic adsorbent.

These purified liquids are mixed and then taken out from a liquid collecting plate 12 provided at the upper part of the column through a line 13 and a valve 14 to the outside of the column.

Note that the flow rate of the raw fruit juice supplied into the tower is determined by the space velocity (
S, V, ) = preferably in the range of 5 to 30 Hr'.

After constant liquid flow, it is necessary to regenerate the anion exchange resin and the synthetic adsorbent, and the case where the illustrated purification tower is used as a regeneration tower will be described next.

First, the liquid in the column is drained from the line 16 via the valve 15.

Next, the pure water in the pure water tank 17 is pumped into the line 1 by the pump 18.
9 and line 7 into the column from the bottom end for backwashing with water, thereby causing the anion exchange resin and synthetic adsorbent to spread and scatter in the column, and insoluble solids etc. to be removed via line 20 and valve 21. Discharge outside the tower.

The liquid flow rate for this backwashing is approximately 5 to 10 Hr-'.

After that, by stopping the supply of pure water into the column, the floating anion exchange resin and synthetic adsorbent settle due to the difference in their specific gravity, and the anion exchange resin forms layer 3 at the bottom of the column. On top is layer 2 of synthetic adsorbent.

Thereafter, the caustic soda in the chemical tank 22 is diluted to a predetermined concentration with pure water supplied by the pump 18, and is supplied into the tower via a line 23 and a valve 24.

Note that the pure water serves as driving water for the ejector 25, and its concentration is adjusted by the degree of opening of the valve 26.

The caustic soda aqueous solution after regenerating the anion exchange resin and synthetic adsorbent in the tower is discharged from the bottom end, and is discharged through valve 2.
7. The sour and bitter components adsorbed on the anion exchange resin and synthetic adsorbent can be efficiently eluted while monitoring the regeneration state via the line 28 with a pH meter 29 and a conductivity meter 30.

After the chemical injection, the valve 26 is closed and only pure water is similarly supplied into the column from the upper part through the line 23, and the pure water is extruded until the caustic soda is completely discharged from the column.

At this time, the pure water flow rate (S, V,) is 3 to 10 Hr.
degree.

After the extrusion of pure water is finished, the pure water in the tower is completely drained from the line 16, thereby completing the regeneration.

Caustic soda (NaOH) is used as the regenerating agent, with a concentration of 40 to 100 tons. /l, sour and bitter components can be efficiently eluted by injecting 1.5 to 4.0 times the total amount of anion exchange resin and synthetic adsorbent.

After the regeneration is completed in this way, the fruit juice concentrate is supplied into the tower from lines 7 and 8 until the properties of the purified liquid are stabilized, and then the liquid collecting plate is passed from the upper part of the tower until the purified liquid properties are stabilized. 12, the liquid is circulated through the valve 31 and the line 32 to be returned to the stock liquid tank 5.

The liquid flow rate (s', v, ) at (7) is 25 to 3
Approximately 0 hours.

After the properties of the purified liquid are stabilized by circulating the stock solution in this manner, the fruit juice stock solution is purified.

In the above-mentioned purification tower, there is no partition between the anion exchange resin layer and the synthetic adsorbent layer, but each layer is provided depending on the difference in specific gravity between them, but the inside of the tower is divided into a section with a water collector. It may be partitioned with a plate to separate the synthetic adsorbent layer chamber and anion exchange resin layer chamber.

In this case, it is necessary to provide sufficient space in each chamber so that the anion exchange resin and the synthetic adsorbent can be sufficiently spread during backwashing with pure water.

When each chamber is partitioned in this way, there is an advantage that there is no need to carefully examine the specific gravity of the anion exchange resin and the synthetic adsorbent.

Further, a column containing an anion exchange resin layer and a column containing a synthetic adsorbent layer may be provided separately.

According to the present invention as described above, the fruit juice stock solution is supplied below the anion exchange resin layer and the synthetic adsorbent layer, and while passing upward through the tower, the sour components are removed by the anion exchange resin and the synthetic adsorbent, respectively. The bitter components are adsorbed and removed without clogging the layer due to insoluble solids contained in the raw fruit juice, and citrus fruit juice with a desired taste and high commercial value can be obtained by a simple operation. A purification column capable of regenerating exchanged resin and synthetic adsorbent can be obtained with simple operations.

An experimental example using a purification tower as illustrated below is shown.

Experimental Example: Using 100% summerwood fruit juice as the fruit juice stock solution and using Mitsubishi Chemical Industries, Ltd.'s trademark Diaion 5AIOA and Diaion HP20 as the anion exchange resin and synthetic adsorbent, acid reduction and desorption were carried out under the following conditions. Bitterness processing was performed.

Test conditions/Column: 100φ % line 6
...30% Test results As a result, the treated purified liquid had a considerable reduction in sourness and bitterness, and had an extremely good flavor.

[Brief explanation of the drawing]

The drawing is a schematic explanatory diagram showing an embodiment of the purification apparatus according to the present invention. 1... Purification tower, 2... Synthetic adsorbent layer, 3... Anion exchange resin layer, 4... Intermediate sprinkler pipe, 5... Stock solution tank, 6゜18... Pump, ? ,8,13,16,19,
2023.28.32...Line, 9,10,14°15.2L24,26,27.31...Valve, 11...
・Liquid collector, 12...Liquid collection plate, 17...Pure water tank, 22
...Medicine tank, 25...Ejector-129...pH meter, 30...Conductivity meter 9

Claims (1)

[Scope of Claims] 1. A purification tower containing an anion exchange resin layer and a synthetic adsorbent layer in the tower, and a stock solution supply means for supplying the fruit juice stock solution below the anion exchange resin layer and the synthetic adsorption layer, respectively. , and purified liquid discharge means provided on the top part, and is configured to further supply the liquid that has passed through the anion exchange resin layer below the synthetic adsorbent layer. 2. The citrus juice purification apparatus according to claim 1, wherein an anion exchange resin layer is provided in the lower part of the column and a synthetic adsorbent layer is provided in the upper part.