JPH08143851A - Recycling system for anti-freezing solution - Google Patents

Abstract

PURPOSE: To provide a anti-freezing solution-recycling system of high efficiency which can minimize the time loss needed for cleaning and exchanging the membrane because the membrane can be cleaned in parallel with the recycling treatment of the antifreezing solution. CONSTITUTION: In this recycling system, a plurality of reverse osmotic membranes 5 are used as a means for recycling a used antifreezing solution 9 containing (A) ethylene glycol, (B) additives, (C) oxidized products of component A, (D) deteriorated products of component B, (E) dissolved metal components and (F) insoluble solids, while the other reverse osmotic membranes 5 are cleaned, preferably by using a detergent-circulating pump 12 to circulate the detergent in a tank 11 for detergent. For example, relatively large component F is removed from the antifreezing solution 9 using filters 3a, 3b, then water and components A-E are separated with membrane 5a, further fed to an ion-exchange resin 6 to give a treated solution 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for reprocessing antifreeze liquid, and more particularly to a method for recovering antifreeze liquid for cooling an internal combustion engine.

[0002]

2. Description of the Related Art A conventional technique is, for example, SAE paper 92.
1635 There are some that use reverse osmosis membrane as disclosed in Fig. 6, but since only one set is used, if the membrane is contaminated, it is necessary to interrupt the treatment to clean the membrane. It wasn't very efficient.

[0003]

SUMMARY OF THE INVENTION In the above-mentioned prior art, when the reverse osmosis membrane is contaminated due to the removal of pollutants and additives, and the treatment performance and the treatment speed are lowered, the treatment is interrupted and the reverse treatment is performed. It was necessary to clean the osmotic membrane and the treatment efficiency was poor.

[0004]

[Means for Solving the Problems] The above-mentioned object is to use a plurality of reverse osmosis membranes and to ensure a washed membrane at all times by providing a reverse osmosis membrane washing function. This is achieved by switching to the other washed membrane immediately if it drops.

[0005]

In the antifreeze regenerating apparatus according to the present invention, a plurality of reverse osmosis membranes can be used and the other membrane can be washed in parallel with the antifreeze treatment. Therefore, the time loss required for washing and replacement of the membrane can be reduced. It is possible to minimize the heat generation and to efficiently regenerate the antifreeze liquid.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a system diagram showing an outline of a method and apparatus for regenerating an antifreeze solution according to an embodiment of the present invention.

The antifreeze regenerating apparatus 1 comprises a first filter 3a and a second filter 3b as a first step, a reverse osmosis membrane 5a as a second step, and an ion exchange resin 6 as a third step.
Each of the processing means comprises a pollutant removal step, and each means is connected by a first pump 2, a second pump 4, a permeate pipe 8a, a residual liquid pipe 8b and various pipes, and a spare reverse osmosis. The membrane 5b is connected to the cleaning agent tank 11 and the third pump 12.

Then, the used antifreeze liquid 9 is regenerated by the antifreeze liquid regeneration treatment apparatus 1 to obtain a treatment liquid 10 of ethylene glycol and water.

Generally, the antifreeze solution before use is a solution prepared by adding water to ethylene glycol.

The used antifreeze liquid 9 extracted from various devices and the internal combustion engine is a mixture of the above substances and pollutants.

As pollutants of the used antifreeze liquid extracted from the internal combustion engine, there are usually an oxidizing component of ethylene glycol, a deterioration component of an additive, a dissolved metal component and a solid substance which is not dissolved. In particular, the metal components of the used antifreeze liquid contain heavy metals such as Pb and Cu which are problematic due to pollution.

First, the used antifreeze liquid 9 is sent to the first filter 3a and the second filter 3b by the first pump 2 as a first step. Here, relatively large undissolved solids such as metal hydroxides and dust are removed.

In the case of the present embodiment, a coarse first filter 3a is provided in the front and a fine second filter 3b is provided in the rear.

Next, the antifreeze solution treated in the first step is pressure-fed to the reverse osmosis membrane 5a by the second pump 4 in the second step. Then, water, ethylene glycol, an additive, an oxidizing component of ethylene glycol or a deterioration component of the additive, and a dissolved metal component including a heavy metal are contained in the reverse osmosis membrane 5a.
Are separated by the membrane of.

On the other hand, in the reverse osmosis membrane 5a, the used antifreeze liquid 9
It is a problem in terms of the size of the apparatus and the pump pressure to process a large amount of the same at a short time. Therefore, the liquid containing the used antifreeze liquid 9 that remains untreated and the component that has not permeated, that is, the residual liquid, is recovered from the residual liquid pipe 8b and returned to the container containing the original used antifreeze liquid 9. . Then, the processes of the first and second steps are repeated again.

Finally, the antifreeze solution treated in the second step, that is, the permeate that has permeated the reverse osmosis membrane 5a is sent to the ion exchange resin 6 through the permeate pipe 8a as the third step.

In the third step, the additive smaller than the molecule of ethylene glycol, the oxidizing component of ethylene glycol and the deteriorated component of the additive are mainly removed.

Then, the additive smaller than the remaining ethylene glycol molecules and the oxidizing component of ethylene glycol and the deteriorated component of the additive, which have not been completely processed in the second step and permeate through the reverse osmosis membrane 5a, are also added. Will be removed.

Then, contaminants are removed, and a treatment liquid 10 of ethylene glycol and water is obtained.

The used antifreeze solution is treated in this way. As the treatment proceeds, the reverse osmosis membrane is contaminated by contaminants in the antifreeze solution, which causes the membrane to become clogged and the permeate flow rate. The decrease comes to appear in the flowmeter 7 downstream of the ion exchange resin.

At that time, the reverse osmosis membrane 5a and the spare reverse osmosis membrane 5
Replace b and continue antifreeze treatment.

This contaminated membrane is then used by the third pump 1
In step 2, the cleaning agent in the cleaning agent tank 11 is circulated for cleaning to prepare for the next replacement.

[0024]

According to the present invention, the membrane can be washed in parallel with the antifreeze regenerating treatment, and the time loss of washing the membrane by interrupting the conventional regenerating treatment is minimized. It is possible to perform efficient work.

[Brief description of drawings]

FIG. 1 is a system diagram showing a device layout of an antifreeze liquid reclamation processing system according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Antifreeze reclaiming apparatus, 2 ... 1st pump, 3a ... 1st filter, 3b ... 2nd filter, 4 ... 2nd pump, 5 ...
Reverse osmosis membrane, 6 ... Ion exchange resin, 7 ... Flowmeter, 8a ... Permeate pipe, 8b ... Residual liquid pipe, 9 ... Used antifreeze liquid, 1
0 ... Treatment liquid, 11 ... Cleaning agent tank, 12 ... Third pump.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location // C07C 31/20 A 9155-4H

Claims (2)

[Claims] 1. Regenerating a used antifreeze liquid containing ethylene glycol, an additive, an oxidizing component of the ethylene glycol, a deterioration component of the additive, a dissolved metal component, and an insoluble solid substance. In an antifreeze reclaiming apparatus using a reverse osmosis membrane as a means, a plurality of reverse osmosis membranes are used, and when one is used, the other reverse osmosis membrane has a function of washing the other antifreeze Processing equipment. 2. The antifreeze reclaiming apparatus according to claim 1, wherein the cleaning function comprises a cleaning agent tank and a cleaning agent circulating pump.