JPS5858128A - Continuous recirculation type org. solvent adsorbing and desorbing apparatus - Google Patents

Abstract

PURPOSE:To enhance the recovery efficiency of an org. solvent and to prevent atmospheric pollution, by a method wherein a primary and a secondary adsorbing and desorbing apparatuses for an org. solvent are provided and the recirculation of gas contg. the org. solvent is enabled. CONSTITUTION:The exhaust gas from a condenser apparatus 11 provided to the desorbing line of a primary adsorbing and desorbing apparatus 12 for an org. solvent is introduced into a secondary adsorbing and desorbing apparatus 29 to adsorb an org. solvent largely remaining therein in good efficiency and steam S'' is subsequently introduced into the apparatus 29 to desorb the adsorbed org. solvent. In the next step, this exhaust gas containing the org. solvent in high concn. is introduced into the apparatus 11 to recover the org. solvent in good efficiency. In addition, the exhaust gas from this apparatus 11 is introduced into the apparatus 12 and met with a gas to be treated sent into an adsorbing chamber 15 and the mixed gas is again subjected to the adsorbing and desorbing cycle.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous circulation type organic solvent adsorption/desorption device with high recovery efficiency of organic solvents, etc., and more specifically, it is provided in the desorption/exhaust line of the primary organic solvent adsorption/desorption device and the Continuous circulation in which the non-condensable exhaust gas is separately guided to the secondary organic solvent adsorption/desorption device through a membrane, the desorption exhaust gas from the cap is condensed, and the non-condensed gas is recirculated to the primary organic solvent adsorption/desorption device. This invention relates to an organic solvent adsorption/desorption device.

The basic structure of a device that processes electrified materials with an adsorbent or the like for the purpose of collecting them or removing harmful components from the air can be conceptually shown in FIG. 1. That is, an adsorption tank 1.2 filled with an adsorbent such as a powder activated method.
ttu (fiQe) as shown in the figure, and connect these with pipes arranged as shown in the figure to alternately repeat adsorption and desorption. Valve 8゜4 is closed and valve 5.6 is set to -. In this case, the gas to be treated G flows in the directions of arrows A, A', and A, and is adsorbed in the adsorption tank 1. At this time, in the adsorption tank 2, valves 7 and 8 are closed and valves 9 and 1o are left open. For example, a deblue gas (usually steam) S flows in the directions of arrows B, B', and B' to perform desorption and is sent to a processing device for the desorbed exhaust gas, for example, # line device ll). Then, after a certain period of time has passed, the opening and closing of the valves are all reversed, and the adsorption tank 1 side desorbs and absorbs the adsorption tank 2.
Adsorption takes place on the side.

However, the above-mentioned type of device has the following drawbacks. In other words, as you can see from the diagram, not only is the operation complicated as it is necessary to provide a large number of valves, but also the desorption gas is required due to malfunctions or failures even though valves 8 and 10 are not open. With blown ttL stone.

The inside of the adsorption tank 1.2 becomes overpressured and exposed to dangers such as explosion.

Therefore, in order to solve the above-mentioned drawbacks, the present applicant has proposed a continuous organic solvent adsorption/desorption device as shown in FIG. 2 (Japanese Patent Publication No. 154-Ji0917).

Water equipment 1111f12 & 1Cij minute aill room】8. Suction@14, 15 and gathering room 16 are defined, and suction ii!
14,1jSK is an adsorbent 2 made of activated I# interwoven fibers.
6.27 has been aalled. Also each adsorption house 14.1!
At the inlet 19°20 and the outlet 21,22 of S, a desorption gas exhaust pipe 17°17m and a desorption gas inlet pipe 1g, Igm are provided.

These are made movable in the vertical direction of the WJ surface by the actuating air cylinder 28. In the figure, the exhaust a pipe 17 and the inlet pipe 18 are in pressure contact with the adsorption w114, so the desorption gas enters the adsorption group 14 from the S/Ii flexible V hose and is desorbed. Adsorption group 1
After repeated adsorption was performed in 5.

It is discharged from outlet 22. Therefore, in the case of electrical equipment MO, even if the WIIII of the desorption gas exhaust pipe or the desorption gas introduction pipe is mistaken, there is no risk of overpressure in the apparatus as described above, and there is no risk of m-fire or the like. However, as the research progressed further, it was discovered that the devices shown in Figure 1.2 had a common drawback. That is, the removal of Wl in the condensing device 11! Recovery of the # agent is carried out by cooling and condensing the electrified solvent that has been neutralized and diffused by steam, so if we consider that the target to be treated is a low-boiling point solvent, cooling with a general refrigerant will not provide sufficient condensation. is not carried out, and a considerable amount of the solvent is discharged in the direction of arrow S' without being condensed. Furthermore, when the concentration of the solvent is dilute, condensation tends to be insufficient, and the emitted sound also increases. Therefore, in each of the above-mentioned apparatuses, the recovery rate is poor (in other words, there is room to improve the removal rate of harmful components) especially when low-boiling point organic solvents and low-concentration organic solvents are to be recovered.

Especially when processing gases containing low concentrations of low boiling point organic solvents.

Condensation and separation tended to be insufficient, and the above-mentioned tendency was strong.

The present invention has been made with attention to these circumstances, and includes a11 solvent adsorption/desorption attachment r! This was done with the aim of increasing the recovery rate of organic solvents in V step 5, including it (not limited to the apparatus shown in Figure 1.2). A device is a primary
A condensing device is provided in the desorption line of the bath agent adsorption/desorption device, a secondary organic solvent adsorption/desorption device is provided in the exhaust a line of non-condensable exhaust, and the discharge line of the secondary adsorption/desorption device is connected to an arbitrary condensation device; The gist lies in that the non-condensing exhaust line of the condensing device is connected to the process gas inlet of the primary organic solvent adsorption/desorption device.

The configuration and effects of the present invention will be explained below based on the drawings showing examples of the present invention. It is also possible to carry out the invention with appropriate modifications within the scope, and all of these are included within the technical scope of the present invention.

Figure 8 is a flow diagram showing the continuous circulation bath agent adsorption/desorption device of this example, and *W is the primary bath agent adsorption/desorption device (for dilute gas) 1! It consists of a condensation device 11, a secondary organic solvent adsorption/desorption device (for II gas) 29, piping connecting these devices, etc., but the structure of the primary adsorption/desorption device w12 is essentially the same as that shown in Figure 2. Since they are essentially the same, Fi-fine is omitted in FIG. However, suction/desorption LiFM! The device configuration itself does not limit the invention.

When operating the adsorption/desorption device shown in Figure 11!2.

Although it varies depending on the H11 class of the gas to be treated and the adsorption capacity 111, generally, after the suction W1 operation is continued for 10 minutes, the exhaust pipe and the introduction pipe are switched and the desorption operation is performed for 8 minutes.

This is because the cycle is often repeated in which @ at the W6 shop on the other side is left idle for 7 minutes until the landing interval (10 minutes) has elapsed, and then the suction operation is started again.

The following description will focus on operations under such conditions.

When treating low-boiling point systems such as those described above, since a large amount of organic solvent remains in the exhaust gas from the condensing device 11, the present invention uses this as it is in the secondary desulfurization device 29.
to be introduced. The secondary adsorption/desorption device 29Fi is smaller due to the smaller processing capacity, but since the exhaust gas containing a fairly high concentration of organic solvent is introduced, low boiling point organic solvents are removed by the primary adsorption/desorption fw installation. It is also adsorbed efficiently. Gas discharge from 1) is completed in 3 minutes due to the above-mentioned reason, but adsorption in the secondary adsorption/desorption device is also completed in 8 minutes, and for the next 7 minutes, gas discharge from the primary adsorption/desorption device is completed in 3 minutes. Desorption gas is not exhausted, Echi secondary adsorption/desorption equipment v/jt
Unlike the primary suction/desorption device, the secondary suction/desorption device performs suction and desorption alternately and intermittently, so it only needs to have one e* chamber.
Water vapor S# is introduced from the opposite direction of Kti, the adsorbed organic solvent is desorbed, and the exhaust steam containing a high concentration of IIf# agent is introduced into the condensing device 11 via the pipe 81, and the adsorbed organic solvent is desorbed. Solvent is efficiently recovered. However, since the exhaust gas from the condensing device 11 still contains some organic solvent, in order to prevent the organic solvent in the exhaust gas from being discharged outside the system, the exhaust a is used as the gas to be treated in the primary adsorption/desorption device 12. Lead to inlet pipe 8'IA 1. Combine it with the gas to be treated that is being sent into the adsorption chamber 6, and then add it again.

Subject to adsorption/desorption psyche A/. The present invention also includes the case where the stirrup is made of secondary suction and carbon dioxide removal.

@Figure 4 is a book that represents the above operation in a time schedule JV manner, so after 10 minutes of adsorption in the adsorption chamber 14, the suction jlf*-115 is adsorbed, and the adsorption tiger 14 is in the desorption state.
Then, after a very small time difference, the condenser iris 1
Condensation is performed in the secondary gas desulfurization device #29, and after 8 minutes, desorption is performed in the secondary gas desulfurization device 129, followed by OIM condensation in the condensation device ff1ll for 8 minutes. The exhaust gas from the condensing device 11 is subjected to adsorption in adsorption@16. Therefore, even after the adsorption and desorption by the secondary adsorption/desorption device f29 is completed, the adsorption in the adsorption chamber 16 continues for another 4 minutes, even though only 6 minutes have been spent during this time. Therefore adsorption! ! 1
The adsorbent warmed during desorption in step 4 is sufficiently cooled down during the 7-minute rest h to prepare for the first adsorption.

In Figure f4@8, the adsorption chamber in the Ifi primary adsorption/desorption equipment lid is 2.
I explained it as a room, but if necessary, it can be made into 8 or more rooms.

It is also recommended as a suitable example that a sufficient cooling period be allowed during the first adsorption restart 40 hours after the end of the desorption O, so that the adsorbent warmed by the desorption steam is sufficiently cooled.

Since the present invention Fi& is configured as described above.

In the past, Kuyu a!
The solvent is adsorbed again without escaping to the outside of the thread.

After detachment, this is condensed and collected, and the egg membrane reduction at this time is 1
Return it to the next adsorption/desorption device? It can be adsorbed 11 rings. Therefore, the recovery efficiency of organic solvents is improved, and
It can almost eliminate its release into the atmosphere, and it greatly contributes to the prevention of air pollution.

[Brief explanation of the drawing]

Fig. 1 is a flow chart of a pulp switching type organic solvent adsorption/desorption device, Fig. 2 is a schematic illustration of a continuous type bath agent adsorption/desorption device for crucian carp, and Fig. 8 is a continuous circulation type organic solvent according to an embodiment of the present invention. FIG. 4 is a flow diagram of the adsorption/desorption device, and FIG. 8 is a graph explaining the operation schedule of the device. 1.2... Adsorbed species 8-10... Valve 11.
...Condensing device i1 12...Primary adsorption/desorption installation Shun 1
8...Distribution chamber 14,115-・Suction*1ir
1. Gathering room 17...Inlet pipe 18...Discharge pipe 28...Air V cylinder 26.27...
・Adsorption material 4...Secondary adsorption/desorption device supplier Toyobo Co., Ltd.

Claims (1)

[Claims] (I) A condensing device is provided in the desorption line of the primary al solvent adsorption/desorption device, a non-condensing cat discharge type discharge line #c is provided, and the 'a! Connect the discharge fin of the secondary adsorption/desorption device to any condensing device @, and connect the discharge line of the non-condensing discharge of the condensing device 0 to the processing gas introduction section #C of the primary state agent adsorption/desorption device. A continuous circulation organic solvent adsorption/desorption device featuring: