JPS61249509A - Extremely high efficiency water washing separator - Google Patents

Abstract

PURPOSE:To separate by washing with water with high efficiency and with a small amt. of water by providing in stages plural washing vessels provided with a water injection nozzle and furnishing a separation layer at the lowermost stage in the titled separator for separating a water-insoluble solvent contg. a water-soluble solvent by washing with water. CONSTITUTION:A liq. mixture 2 flowing in from a liq. mixture inflow part 9 is charged into the first washing vessel 7a, brought into contact with washing water and washed. The washing water after extracting alkyl alcohol is transferred to the upper water vessel. Liq. trichlorotrifluoroethane is charged in the second washing vessel 7b at the oblique lower part which is one stage lower than the first washing vessel 7a, washed and then further washed in the third washing vessel 7c. The washed trichlorotrifluoroethane flows out from a washed liq. outlet 13, falls into the first liq. storage 14, passes through partition plates 15a and 15b and transfers to the second liq. storage 14b then to the third liq. storage 14. The liq. is taken out from a discharge valve 5, distilled and dried.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hypermobility water washing separation device, and more specifically,
The present invention relates to a device that can wash and separate water-insoluble solvents containing water-soluble solvents with extremely high efficiency.

[Prior Art] When cleaning optical components, alkyl alcohol is used in the dehydration process. It is necessary to remove this alkyl alcohol as a dehydrating agent from the optical components, and for this purpose, the alkyl alcohol adhering to the optical components is washed and removed with a condensate of trichlorotrifluoroethane in a tank of drying paper (this is done by distillation drying). (This is a process called
The mixed liquid generated by washing here is discharged from the drying tray process, then enters the washing separation tank, and is brought into contact with water and washed with water, whereby the alkyl alcohol is dissolved in water and becomes a mixed liquid with water. Trichlorofluoroethane is discharged from the water washing separation tank and sent to a pollution treatment process, and trichlorofluoroethane is a water-insoluble substance with a specific gravity heavier than water and becomes the lower liquid phase of the two-liquid separated liquid layer in the washing separation tank. This lower liquid phase trichlorofluoroethane is used again for distillation drying.

For reuse, the water washing separation purity (separation purity of alkyl alcohol and trichlorotrifluoroethane) of this trichlorotrifluoroethane needs to be close to about 100%.

In the conventional water washing separation method, as shown in Figure 2, a serpentine shower pipe l is installed in the trichlorotrifluoroethane solution layer at the bottom of the washing separation tank, and the alkyl alcohol that cannot be separated is dissolved in the upper layer of the two liquid layers. The alkyl alcohol was removed by washing the trichlorofluoroethane solution in the lower layer with shower water.

In Fig. 2, A indicates a region of a mixture of water and alkyl alcohol produced by water washing, C indicates a water washing region, and 2 indicates a region of a mixture of water and alkyl alcohol generated from the distillation drying process. 3 is a cleaning water supply valve, 4 is a take-out port, 5 is a take-out valve, 6
is the cleaning drainage outlet.

[Problems to be Solved by the Invention] However, in the conventional water washing separation described above, it is necessary to separate 100% of the alkyl alcohol, so the mixture of trichlorofluoroethane and alkyl alcohol is used approximately 8 times per day per washing machine. Approximately 5 x 3 days of washing water is required to process the water, and if 7 to 8 washing machines are installed in a factory, the amount of waste water will reach 35 to 40 ta per 37 days. was there.

Furthermore, since the wastewater generated here contains dissolved alkyl alcohol, it is designated as organic wastewater from a pollution prevention perspective, and the treatment of this wastewater is fraught with difficulties and the processing costs are enormous.

Therefore, there has been a strong demand for an apparatus capable of separating alkyl alcohols with a small amount of washing water from the viewpoint of pollution prevention and pollution treatment costs.

The present invention has been made in order to solve the above problems and provide an apparatus that can wash and separate water-insoluble solvents containing water-soluble solvents with extremely high efficiency.

[Means for Solving the Problems] According to the present invention, water washing is performed by bringing water into contact with a mixture of a water-soluble solvent and a water-insoluble solvent having a higher specific gravity than water and extracting the water-soluble solvent with water. This equipment separates non-water-soluble solvents, and is equipped with a plurality of washing tanks equipped with water jet nozzles at the bottom in a stepped manner, and a non-water-soluble solvent layer and a water layer below the bottom washing tank. A super-mobility water washing separation device is provided, which is characterized by being provided with a separation tank for separation.

[Example] Next, the present invention will be described with reference to embodiments shown in the drawings.

In the following examples, trichlorotrifluoroethane is used as a water-insoluble solvent having a specific gravity higher than water, and alkyl alcohol is used as a water-soluble solvent.

FIG. 1 is a schematic explanatory diagram showing a supermobility water washing separation apparatus of the present invention.

In FIG. 1, 2 is a mixture of alkyl alcohol and trichlorotrifluoroethane.

The mixed liquid 2 is discharged from the distillation drying process. 7a, ? b.? c is a washing tank, and ? A is a first washing tank, 7b is a second washing tank, and 7C is a third washing tank. Wash tank? a, 7b, ? c is a centrally inclined type with a deep central part, and each has a water jet nozzle 8a at the bottom.
, 8b, and 8c. The washing tank.

at★%ura? l11m9★%jl17h Chiku*★item k
They are arranged in a stepwise manner in the order of ll 7 e.

The mixed liquid 2 flowing from the mixed liquid inlet 9 flows into the first washing tank 7.
a and comes into contact with the washing water 10 ejected from the water ejection nozzle 8a, washing with water is performed, and alkyl alcohol is extracted from the trichlorotrifluoroethane-alkyl alcohol mixture into water. Here, water jet nozzles 8a, 8b
, 8c, a nozzle called a shower nozzle provided with a large number of thin holes is suitably used in order to improve the contact efficiency between water and the liquid to be cleaned. 3 is a wash water supply valve;
Reference numeral 11 denotes a flow meter, which adjusts the opening and closing of the cleaning water supply valve 3 while feeding back the flow rate measured by the flow meter 11.
Water jet nozzles 8a, 8b, 8 spray cleaning water at a predetermined flow rate.
supply to c. The amount of water washing is 1.251/H. The washing water from which the alkyl alcohol has been extracted passes through the trichlorotrifluoroethane liquid layer and moves to the upper water layer.
The trichlorotrifluoroethane liquid washed in the first washing tank 3a flows through the outlet 12a into the second washing tank 3b, which is provided one stage diagonally below the first washing tank 3a, and there, from the water jet nozzle 8b. It is washed with a jet of washing water.

After that, the third washing tank? Similar water washing is performed in C. The trichlorotrifluoroethane that has been washed with water flows out from the water washing completion outlet 13. The water washing completion outlet 13 is the third
It is formed by drilling a hole at a predetermined level position on the wall of the water washing tank 7C, but it may also be formed by cutting out a 1 m upper part with a predetermined width and a predetermined height.
The same applies to 2a and 12b. ).

Trichlorotrifluoroethane flowing out from the water washing completion outlet 13 falls into the first liquid reservoir 14a, passes through partition plates 15a and 15b having openings (not shown), and is then transferred to the second liquid reservoir 14b and then to the third liquid reservoir 14a. The liquid is transferred to the liquid reservoir 14c, taken out from the take-out valve 5 provided in the third liquid reservoir 14c, and used as recycled trichlorotrifluoroethane in the distillation drying process.

In FIG. 1, A is the main cleaning area, and B is the pure trichlorotrifluoroethane area. The water containing dissolved alkyl alcohol overflows from the washing drain outlet 6,
Subjected to pollution treatment.

The separation purity of trichlorotrifluoroethane separated and flowing out from the water washing completion outlet 13 is that it does not contain alkyl alcohol.
The purity was close to 100%. Further, as a result of analyzing the same liquid in the trichlorotrifluoroethane region in the first liquid reservoir 14a, it was found that it did not contain alkyl alcohol and was 100% as above. The values shown above are based on the fact that the solubility limit amount of alkyl alcohol in washing water (the amount of alkyl alcohol that dissolves into trichlorotrifluoroethane from a certain concentration) is set at approximately 25%, and the dissolution limit amount of alkyl alcohol in washing water is set at approximately 25%. trichlorotrifluoroethane flowing into the separation device of the present invention from
This is a value when the alkyl alcohol content in the alkyl alcohol mixture is 60% by weight.

[Effects of the Invention] As described above, the hypermobility water washing separator of the present invention is equipped with a plurality of washing tanks equipped with water jet nozzles at the bottom in a stepped manner, so that it has a higher water content than water containing a water-soluble solvent. The water-insoluble solvent having a specific gravity is washed with water at each stage while flowing down from the upper stage to the lower stage of the water washing tank, and water washing is performed with extremely high efficiency. In addition, since a separation tank is provided below the lowest washing tank to separate the non-water-soluble solvent layer and the water layer, the non-aqueous solvent in this separation tank has a higher specific gravity than the water that has been washed in the washing tank. The solvent is ensured to be separated as the lower layer. As described above, according to the apparatus of the present invention, since water washing is performed with high efficiency, the amount of washing water used is small, and the amount of washing waste water is also reduced, so that the treatment of washing waste water can be performed extremely easily. This is of great industrial significance.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing a super-mobility water washing separator according to the present invention, and FIG. 2 is a schematic explanatory diagram showing a conventional water washing separator. l...Shower pipe 2...Mixed liquid 3...Washing water supply valve 4...Outlet port 5...Outlet valve 6...Washing drain outlet aa...First washing tank 7b. ...Second washing tank 7c...Third washing tank 8a, 8b, 8c...Water jet nozzle 9...Mixed liquid inlet 1G...Washing water 11...Flowmeter 12a, 12b-- - Outlet 13...Washing completion outlet 14a...First liquid reservoir 14b...Second liquid reservoir 14c...Third liquid reservoir 15a, 15b---Partition plate A...Washing water area B・...Pure trichlorotrifluoroethane region C...
・Washing area

Claims (1)

[Claims] This is a device that separates the non-water-soluble solvent by washing with water by bringing water into contact with a mixture of a water-soluble solvent and a non-water-soluble solvent with a higher specific gravity than water, and extracting the water-soluble solvent with water. Ultra-efficient water washing characterized by having a plurality of washing tanks equipped with jet nozzles in a stepped manner, and a separation tank for separating a water-insoluble solvent layer and a water layer below the lowest washing tank. Separation device.