JP2013128905A - System for treating gas containing organic solvent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system for treating a gas containing an organic solvent, with which the running cost can be suppressed while improvement in the purification capacity of a raw gas and the recovery rate of the organic solvent are targeted.SOLUTION: A system 1A for treating a gas containing an organic solvent includes: a circulation path for flowing a carrier gas; and a first adsorption and desorption device 100, a condensation and recovery device 200, and a second adsorption and desorption device 300, all being disposed on the circulation path. The first adsorption and desorption device 100 includes the first adsorption and desorption elements 121, 131. The second adsorption and desorption device 300 includes the second adsorption element 321 and a temperature adjustment mechanism 330A. In the initial stage of beginning of the period of adsorption and desorption in which the organic solvent is adsorbed from the first adsorption and desorption elements 121, 131, the temperature adjustment mechanism 330A sets the carrier gas discharged from the condensation and recovery device 200 to a high temperature and supplies it to the second adsorption and desorption device 321. In the final stage of adsorption and desorption, the temperature adjustment mechanism sets the carrier gas to a low temperature and supplies it to the second adsorption and desorption element 321.

Description

  The present invention relates to an organic solvent-containing gas processing system, and more specifically, the organic solvent is purified and discharged by separating the organic solvent from the raw gas containing the organic solvent, and the organic solvent separated from the raw gas The present invention relates to an organic solvent-containing gas processing system for recovering gas using carrier gas.

  Conventionally, it is possible to clean the raw gas and recover the organic solvent by moving the organic solvent from the raw gas to the carrier gas by using the adsorbent as the adsorption / desorption element to perform the adsorption treatment and desorption treatment of the organic solvent. An organic solvent-containing gas treatment system is known.

  This type of organic solvent-containing gas treatment system is generally discharged from the adsorption / desorption treatment device for bringing the raw gas and the carrier gas in a high temperature state into contact with the adsorbent alternately in time, and the adsorption / desorption treatment device. And a condensing / recovering device for condensing and recovering the organic solvent by cooling the carrier gas in a high temperature state.

  For example, Japanese Utility Model Publication No. 7-2028 (Patent Document 1) discloses an organic solvent-containing gas processing system using water vapor as a carrier gas. Japanese Patent Application Laid-Open No. 7-68127 (Patent Document 2) discloses an organic solvent-containing gas processing system using an inert gas heated to a high temperature as a carrier gas.

No. 7-2028 JP-A-7-68127

  In the organic solvent-containing gas processing system described above, in order to improve the purification performance for the raw gas and the recovery efficiency of the organic solvent, it is necessary that the desorption of the organic solvent in the desorption process, that is, the regeneration of the adsorbent is sufficiently performed. become.

  In addition, in order to reduce the running cost of the organic solvent-containing gas processing system, the carrier gas is used only once and is not disposable. It is preferable that the carrier gas is used by being circulated.

  However, it is difficult to completely separate the organic solvent from the carrier gas in the condensing and collecting apparatus. Therefore, the carrier gas discharged from the condensing and collecting apparatus contains a certain amount of uncondensed organic solvent. Therefore, when the carrier gas containing the non-condensed organic solvent is circulated as it is and returned to the adsorption / desorption treatment device, the adsorbent is not sufficiently regenerated, and the purification capability for the raw gas and the organic solvent are reduced. There was a problem that a limit naturally occurred in improving the recovery efficiency.

  Therefore, the present invention has been made to solve the above-mentioned problems, and the running cost can be suppressed, and the organic solvent-containing gas in which the purification ability for the raw gas and the recovery efficiency of the organic solvent are improved. An object is to provide a processing system.

  The organic solvent-containing gas processing system according to the first aspect of the present invention cleans and discharges the raw gas by separating the organic solvent from the raw gas containing the organic solvent, and removes the organic solvent separated from the raw gas. A recovery path, which is recovered using a carrier gas, through which the carrier gas circulates, and a first adsorption / desorption treatment device, a condensation recovery device, and a second adsorption / desorption treatment provided on the circulation path. Device. The first adsorption / desorption treatment apparatus includes a first adsorption / desorption element that adsorbs and desorbs an organic solvent. The condensation recovery device recovers an organic solvent as a condensate by condensing the organic solvent. The second adsorption / desorption treatment apparatus includes a second adsorption / desorption element that adsorbs and desorbs an organic solvent. The first adsorption / desorption treatment device further includes first temperature adjusting means for adjusting the temperature of the carrier gas discharged from the second adsorption / desorption treatment device in a high temperature state or a low temperature state to a high temperature state, The organic solvent is heated from the raw gas to the high temperature by bringing the raw gas and the carrier gas whose temperature is adjusted by the first temperature adjusting means into contact with the first adsorption / desorption element alternately in time. It moves to the carrier gas in the state of. The condensing and collecting apparatus condenses the organic solvent by adjusting the temperature of the carrier gas discharged from the first adsorption / desorption processing apparatus to a low temperature state. The second adsorption / desorption treatment device alternately adjusts the temperature of the carrier gas in a low temperature state including the non-condensed organic solvent discharged from the condensation recovery device to either a high temperature state or a low temperature state in time. A second temperature adjusting means for controlling the temperature of the carrier gas at a high temperature by the second temperature adjusting means and a low temperature at a temperature adjusted by the second temperature adjusting means. By bringing the carrier gas into contact with the second adsorption / desorption element alternately in time, the organic solvent is moved from the carrier gas in a low temperature state to the carrier gas in a high temperature state. The second temperature adjusting means is a carrier in a low temperature state containing an uncondensed organic solvent discharged from the condensation recovery device at the beginning of a desorption process period in which the organic solvent is desorbed from the first adsorption / desorption element. The gas is adjusted to a high temperature state, and at the end of the desorption treatment period in which the organic solvent is desorbed from the first adsorption / desorption element, the gas is brought into a low temperature state including the uncondensed organic solvent discharged from the condensation recovery device. The temperature of a certain carrier gas is adjusted to a low temperature state.

  The organic solvent-containing gas treatment system according to the second aspect of the present invention cleans and discharges the raw gas by separating the organic solvent from the raw gas containing the organic solvent, and removes the organic solvent separated from the raw gas. A recovery path, which is recovered using a carrier gas, through which the carrier gas circulates, and a first adsorption / desorption treatment device, a condensation recovery device, and a second adsorption / desorption treatment provided on the circulation path. Device. The first adsorption / desorption treatment apparatus includes a first adsorption / desorption element that adsorbs and desorbs an organic solvent. The condensation recovery device recovers an organic solvent as a condensate by condensing the organic solvent. The second adsorption / desorption treatment apparatus includes a second adsorption / desorption element that adsorbs and desorbs an organic solvent. The first adsorption / desorption treatment device further includes first temperature adjusting means for adjusting the temperature of the carrier gas discharged from the second adsorption / desorption treatment device in a high temperature state or a low temperature state to a high temperature state, The organic solvent is heated from the raw gas to the high temperature by bringing the raw gas and the carrier gas whose temperature is adjusted by the first temperature adjusting means into contact with the first adsorption / desorption element alternately in time. It moves to the carrier gas in the state of. The condensing and collecting apparatus condenses the organic solvent by adjusting the temperature of the carrier gas discharged from the first adsorption / desorption processing apparatus to a low temperature state. The second adsorption / desorption treatment device includes a treatment for adjusting the temperature of a low-temperature carrier gas containing an uncondensed organic solvent discharged from the condensation recovery device to a high temperature state, and the first adsorption / desorption treatment device. And a second temperature adjusting means for alternately adjusting the temperature of the discharged carrier gas in a high temperature state to a low temperature state without passing through the condensing and collecting device. (2) The carrier gas that has been temperature-adjusted by the temperature adjusting means and is in a high temperature state and the carrier gas that has been temperature-adjusted by the second temperature adjusting means and are in a low-temperature state are alternately absorbed in time with the second absorption gas. By bringing the organic solvent into contact with the desorption element, the organic solvent is moved from the carrier gas in a low temperature state to the carrier gas in a high temperature state. The second temperature adjusting means is a carrier in a low temperature state containing an uncondensed organic solvent discharged from the condensation recovery device at the beginning of a desorption process period in which the organic solvent is desorbed from the first adsorption / desorption element. The carrier gas in the high temperature state discharged from the first adsorption / desorption treatment apparatus is removed at the end of the desorption treatment period in which the temperature of the gas is adjusted to a high temperature and the organic solvent is desorbed from the first adsorption / desorption element. The temperature is adjusted to a low temperature without going through the condensation recovery device.

  In the organic solvent-containing gas processing system based on the first and second aspects of the present invention, the carrier gas is preferably an inert gas.

  In the organic solvent-containing gas treatment system based on the first and second aspects of the present invention, the first adsorption / desorption element is preferably an activated carbon fiber.

  In the organic solvent-containing gas treatment system based on the first and second aspects of the present invention, the second adsorption / desorption element is preferably an activated carbon fiber.

  In the organic solvent-containing gas treatment system based on the first and second aspects of the present invention, when the first adsorption / desorption element and the second adsorption / desorption element are both activated carbon fibers, The specific surface area of the activated carbon fiber as the second adsorption / desorption element is preferably larger than the specific surface area of the activated carbon fiber as the first adsorption / desorption element.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as the organic-solvent containing gas processing system in which the running cost can be suppressed and the purification | cleaning capability with respect to raw gas and the improvement of the recovery efficiency of an organic solvent were aimed at.

It is a system configuration | structure figure of the organic solvent containing gas processing system in Embodiment 1 of this invention. 2 is a time chart showing a state of temporal switching between an adsorption process and a desorption process using a pair of first adsorption / desorption elements and a second adsorption / desorption element in the organic solvent-containing gas treatment system shown in FIG. 1. It is a system block diagram of the organic solvent containing gas processing system in Embodiment 2 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the same or common parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a system configuration diagram of an organic solvent-containing gas processing system according to Embodiment 1 of the present invention. First, with reference to this FIG. 1, the structure of the organic solvent containing gas processing system 1A in this Embodiment is demonstrated.

  As shown in FIG. 1, an organic solvent-containing gas treatment system 1A in the present embodiment includes a circulation path through which a carrier gas circulates, and a first adsorption / desorption treatment apparatus 100 provided on the circulation path. , A condensing and collecting apparatus 200, a second adsorption / desorption processing apparatus 300, and a blower 400 are mainly provided.

  Here, the circulation path is mainly configured by the piping lines L3 to L7 shown in the figure, and the blower 400 is a blowing means for allowing the carrier gas to flow through the circulation path. As the carrier gas, various types of gases such as water vapor, heated air, and an inert gas heated to a high temperature can be used. In particular, an inert gas that does not contain moisture is used. In this case, the organic solvent-containing gas processing system can be configured more simply.

  The first adsorption / desorption treatment apparatus 100 includes a first adsorption / desorption treatment tower 110 having a first treatment tank 120 and a second treatment tank 130, and a heater 140 as first temperature adjusting means. The first treatment tank 120 accommodates a first adsorption / desorption element 121 that adsorbs and desorbs an organic solvent, and the second treatment tank 130 accommodates a first adsorption / desorption element 131 that adsorbs and desorbs an organic solvent. Has been.

  The heater 140 is for adjusting the temperature of the carrier gas supplied to the first adsorption / desorption processing device 100 to a high temperature state. More specifically, the heater 140 is discharged from the second adsorption / desorption treatment device 300 and is blower 400. The carrier gas that is in a high temperature state or a low temperature state via the temperature control is adjusted to a high temperature state and supplied to the first adsorption / desorption treatment tower 110. Here, the heater 140 heats the carrier gas introduced into the first processing tank 120 and the second processing tank 130 so that the first adsorption / desorption elements 121 and 131 are maintained at a predetermined desorption temperature. .

  The first adsorption / desorption elements 121 and 131 adsorb the organic solvent contained in the raw gas by contacting the raw gas. Accordingly, in the first adsorption / desorption treatment apparatus 100, the organic gas is adsorbed by the first adsorption / desorption elements 121 and 131 by supplying the raw gas to the first treatment tank 120 and the second treatment tank 130, and thereby By separating the organic solvent from the gas, the raw gas is purified and discharged from the first processing tank 120 and the second processing tank 130 as a clean gas.

  Further, the adsorption / desorption elements 121 and 131 desorb the adsorbed organic solvent by contacting a carrier gas in a high temperature state. Therefore, in the first adsorption / desorption processing apparatus 100, the organic solvent is desorbed from the first adsorption / desorption elements 121 and 131 by supplying a high-temperature carrier gas to the first treatment tank 120 and the second treatment tank 130. Thus, the carrier gas in a high temperature state containing the organic solvent is discharged from the first processing tank 120 and the second processing tank 130.

  The first adsorption / desorption elements 121 and 131 are composed of an adsorbent containing any of activated carbon, activated carbon fiber, and zeolite. Preferably, the first adsorption / desorption elements 121 and 131 are activated carbon or zeolite in the form of granules, powders, honeycombs, etc., but more preferably activated carbon fibers. Since the activated carbon fiber has a fibrous structure having micropores on the surface, the contact efficiency with the gas is high, and high adsorption efficiency is realized as compared with other adsorbents.

  Piping lines L1 and L2 are connected to the first adsorption / desorption treatment device 100, respectively. The piping line L1 is a piping line for supplying raw gas containing an organic solvent to the first processing tank 120 and the second processing tank 130, and the first processing tank 120 and the second processing tank 130 are provided by valves V101 and V102. The connection / disconnection state for is switched. The piping line L2 is a piping line for discharging clean gas from the first processing tank 120 and the second processing tank 130, and is connected / disconnected to the first processing tank 120 and the second processing tank 130 by the valves V103 and V104. The state is switched.

  In addition, piping lines L3 and L4 are connected to the first adsorption / desorption treatment apparatus 100, respectively. The piping line L3 is a piping line for supplying the carrier gas to the first processing tank 120 and the second processing tank 130 via the heater 140, and the first processing tank 120 and the second processing tank are provided by valves V105 and V106. The connection / disconnection state for 130 is switched. The piping line L4 is a piping line for discharging the carrier gas from the first processing tank 120 and the second processing tank 130, and is connected / disconnected to the first processing tank 120 and the second processing tank 130 by valves V101 and V102. The state is switched.

  In each of the first treatment tank 120 and the second treatment tank 130, by operating the opening and closing of the valves V101 to V106 described above, the raw gas and the carrier gas whose temperature is adjusted by the heater 140 and in a high temperature state Are alternately supplied in time. Thereby, the 1st processing tank 120 and the 2nd processing tank 130 will function alternately as an adsorption tank and a desorption tank in time, and in connection with this, the carrier gas from which organic solvent is in a state of high temperature from original gas Will be moved to. Specifically, when the first treatment tank 120 functions as an adsorption tank, the second treatment tank 130 functions as a desorption tank, and the first treatment tank 120 functions as a desorption tank. In addition, the second treatment tank 130 functions as an adsorption tank.

  Here, the piping line L1 is connected to a processing tank functioning as an adsorption tank among the first processing tank 120 and the second processing tank 130 and supplies raw gas to the processing tank. Of the first treatment tank 120 and the second treatment tank 130, it is connected to a treatment tank functioning as an adsorption tank and discharges clean gas from the treatment tank. The piping line L3 is connected to a processing tank functioning as a desorption tank among the first processing tank 120 and the second processing tank 130 and supplies carrier gas to the processing tank. Of the first treatment tank 120 and the second treatment tank 130, the carrier gas is discharged from the treatment tank connected to the treatment tank functioning as a desorption tank.

  The condensing and collecting apparatus 200 includes a condenser 210 and a collecting tank 220. The capacitor 210 condenses the organic solvent contained in the carrier gas by adjusting the temperature of the carrier gas in a high temperature state to a low temperature state, and specifically, the carrier gas is cooled using cooling water or the like. It is composed of a cooler that liquefies the organic solvent by cooling. The recovery tank 220 stores the organic solvent liquefied by the condenser 210 as a condensed liquid.

  Piping lines L4 and L5 are connected to the condensation recovery apparatus 200, respectively. The piping line L4 is a piping line for supplying the high-temperature carrier gas discharged from the first adsorption / desorption processing device 100 to the capacitor 210, and the piping line L5 is an uncondensed residue remaining in the capacitor 210. This is a piping line for discharging a carrier gas containing an organic solvent in a low temperature state from the capacitor 210.

  Further, piping lines L8 and L9 are connected to the condensing and collecting apparatus 200, respectively. The piping line L8 is a piping line for discharging the condensate of the organic solvent stored in the recovery tank 220 to the outside, and the piping line L9 conveys the organic solvent volatilized in the recovery tank 220. This is a piping line for returning to the piping line L1.

  The second adsorption / desorption treatment apparatus 300 includes an adsorption / desorption treatment tower 310 having a single treatment tank 320, and a temperature adjustment mechanism 330A as second temperature adjustment means. The treatment tank 320 accommodates a second adsorption / desorption element 321 that adsorbs and desorbs an organic solvent.

  The temperature adjustment mechanism 330A is for adjusting the temperature of the carrier gas supplied to the second adsorption / desorption treatment apparatus 300 alternately in time either to a high temperature state or a low temperature state, more specifically, The second adsorption / desorption treatment tower is obtained by alternately adjusting the temperature of the carrier gas in a low temperature state containing the non-condensed organic solvent discharged from the condensation recovery apparatus 200 to either a high temperature state or a low temperature state in terms of time. 310 to supply.

  The temperature adjustment mechanism 330A includes a heater 331 provided on the piping line L5, a piping line L6 as a bypass line provided so as to branch from the piping line L5 and join again to the piping line L5, and the piping line L5. A valve V301 provided and a valve V302 provided in the piping line L6 are included. Note that both the heater 331 and the valve V301 are provided in a portion of the piping line L5 that runs parallel to the piping line L6 that is branched from the piping line L5.

  Here, when the heater 331 adjusts the temperature of the low-temperature carrier gas containing the non-condensed organic solvent to the high temperature state and supplies the carrier gas to the second adsorption / desorption treatment tower 310, the second adsorption / desorption element 321 The carrier gas introduced into the treatment tank 320 is heated so that the predetermined desorption temperature is maintained.

  On the other hand, the pipe line L6 has a second adsorbing / desorbing element 321 when the carrier gas in a low temperature state containing an uncondensed organic solvent is adjusted to a low temperature and supplied to the second adsorption / desorption processing tower 310. It is a piping line for transporting the carrier gas introduced into the processing tank 320 as it is or cooling it as necessary so as to be maintained at a predetermined adsorption temperature. When the carrier gas is cooled in the piping line L6, it is efficient to provide a separate cooler in the piping line L6.

  The second adsorption / desorption element 321 desorbs the adsorbed organic solvent by bringing a carrier gas in a high temperature state into contact therewith. Therefore, in the second adsorption / desorption treatment apparatus 300, the organic solvent is desorbed from the second adsorption / desorption element 321 by supplying the carrier gas in a high temperature state to the treatment tank 320, thereby the high temperature containing the organic solvent. In this state, the carrier gas is discharged from the processing tank 320.

  The second adsorption / desorption element 321 adsorbs the organic solvent by bringing a carrier gas in a low temperature state into contact therewith. Therefore, in the second adsorption / desorption treatment apparatus 300, the organic solvent is adsorbed by the second adsorption / desorption element 321 by supplying the carrier gas in a low temperature state to the treatment tank 320, whereby the organic solvent is removed from the carrier gas. As a result of the separation, the concentration of the organic solvent contained in the carrier gas is reduced, and the low-temperature carrier gas having the reduced concentration of the organic solvent is discharged from the treatment tank 320.

  The second adsorption / desorption element 321 is composed of an adsorbent containing any of activated carbon, activated carbon fiber, and zeolite. Preferably, as the second adsorption / desorption element 321, activated carbon or zeolite such as granular, powder, or honeycomb is used, and more preferably activated carbon fiber is used. Since the activated carbon fiber has a fibrous structure having micropores on the surface, the contact efficiency with the gas is high, and high adsorption efficiency is realized as compared with other adsorbents.

  Piping lines L5 and L7 are connected to the second adsorption / desorption processing device 300, respectively. The piping line L5 is a piping line for supplying the carrier gas to the temperature adjusting mechanism 330A, and the piping line L7 is a piping line for discharging the carrier gas from the processing tank 320.

  In the treatment tank 320, by operating the above-described opening and closing of the valves V301 and V302, the temperature is adjusted by the temperature adjusting mechanism 330A and the carrier gas is in a high temperature state, and the temperature is adjusted by the temperature adjusting mechanism 330A and the temperature is low. In this state, the carrier gas is alternately supplied over time. As a result, the treatment tank 320 functions alternately as an adsorption tank and a desorption tank over time, and accordingly, the organic solvent is moved from the carrier gas in the low temperature state to the carrier gas in the high temperature state. Will be.

  Here, the temperature adjusting mechanism 330A supplies a carrier gas in a high temperature state by connecting the heater 331 to the processing tank 320 when the processing tank 320 functions as a desorption tank. Is made to function as an adsorption tank, a pipe line L6 is connected to the processing tank 320, and a carrier gas in a low temperature state is supplied to the processing tank 320.

  The high-temperature or low-temperature carrier gas discharged from the second adsorption / desorption processing device 300 is conveyed to the blower 400 via the piping line L7, and after passing through the blower 400, via the piping line L3. It is supplied to the first adsorption / desorption treatment apparatus 100.

  The above-described piping line L3 is provided with a piping line L0 for introducing the carrier gas from the outside into the circulation path. The piping line L0 is used for introducing the carrier gas into the circulation path at the time of initial installation of the organic solvent-containing gas treatment system 1A described above, or for replenishing the carrier gas to the circulation path as necessary during maintenance or the like. Is.

  FIG. 2 is a time chart showing how the adsorption process and the desorption process using the pair of first adsorption / desorption elements and the second adsorption / desorption element are temporally switched in the organic solvent-containing gas treatment system shown in FIG. . Next, with reference to this FIG. 2, the detail of the process of the organic solvent containing gas performed in the organic solvent containing gas processing system 1A in this Embodiment is demonstrated.

  With reference to FIG. 2, the organic solvent-containing gas processing system 1A in the present embodiment continuously processes the organic solvent-containing gas by repeating the cycle with one cycle shown in the figure as a unit period. It is done.

  In the first half of the above cycle (between times t0 and t2 shown in the figure), the adsorption process is performed in the first treatment tank 120 of the first adsorption / desorption treatment apparatus 100 in which the first adsorption / desorption element 121 is installed, In parallel with this, the desorption process is performed in the second treatment tank 130 of the first adsorption / desorption processing apparatus 100 in which the first adsorption / desorption element 131 is installed.

  Further, in the first stage of the first half of the cycle (between times t0 and t1 shown in the figure), the desorption process is performed in the processing tank 320 of the second adsorption / desorption processing apparatus 300 in which the second adsorption / desorption element 321 is installed. In the stage at the end of the first half of the one cycle (between times t1 and t2 shown in the figure), the adsorption treatment is performed in the processing tank 320.

  In the second half of the above cycle (between times t2 and t4 shown in the drawing), the desorption process is performed in the first treatment tank 120 of the first adsorption / desorption treatment apparatus 100 in which the first adsorption / desorption element 121 is installed. In parallel with this, the adsorption process is performed in the second treatment tank 130 of the first adsorption / desorption treatment apparatus 100 in which the first adsorption / desorption element 131 is installed.

  Further, in the first stage of the latter half of the cycle (between times t2 and t3 shown in the figure), the desorption process is performed in the processing tank 320 of the second adsorption / desorption processing apparatus 300 in which the second adsorption / desorption element 321 is installed. In the last stage of the latter half of the cycle (between times t3 and t4 shown in the figure), the adsorption treatment is performed in the processing tank 320.

  That is, in the organic solvent-containing gas processing system 1A according to the present embodiment, the second absorption is performed at the beginning of the desorption process period in which the desorption process is performed in any one of the pair of first adsorption / desorption elements 121 and 131. The desorption process is performed in the desorption element 321 and the adsorption process is performed in the second adsorption / desorption element 321 at the end of the desorption process period in which the desorption process is performed in one of the pair of first adsorption / desorption elements 121 and 131. The

  Note that, during the above-described one cycle, the organic solvent is always recovered from the carrier gas in the condensation recovery apparatus 200.

  Next, an operation performed in the organic solvent-containing gas processing system 1A in the present embodiment to specifically realize the above-described processing of the organic solvent-containing gas will be described in detail with reference to FIG. The following description is based on the state where the first treatment tank 120 of the first adsorption / desorption treatment apparatus 100 functions as an adsorption tank and the second treatment tank 130 functions as a desorption tank. The same operation is performed when the adsorption tank and the desorption tank are switched.

  As shown in FIG. 1, the first stage of the desorption process period of the first adsorption / desorption element 131 accommodated in the second treatment tank 130 of the first adsorption / desorption treatment apparatus 100 (that is, t0 to t1 shown in FIG. 2). In the middle), the valve V301 provided in the temperature adjustment mechanism 330A is opened and the valve V302 is closed, so that the carrier in a low temperature state containing the non-condensed organic solvent discharged from the condensation recovery apparatus 200 is obtained. The gas is introduced into the heater 331 and heated to a high temperature state to adjust the temperature, and is supplied to the treatment tank 320 of the second adsorption / desorption treatment apparatus 300 to be brought into contact with the second adsorption / desorption element 321.

  As a result, the adsorbed organic solvent of the second adsorption / desorption element 321 is desorbed from the second adsorption / desorption element 321 by the high-temperature carrier gas, and the organic in the carrier gas discharged from the processing tank 320 is removed. The solvent concentration gradually increases. In connection with this, the density | concentration of the organic solvent contained in the carrier gas made to contact the 1st adsorption / desorption element 131 accommodated in the 2nd processing tank 130 of the 1st adsorption / desorption processing apparatus 100 also rises gradually. However, there is almost no influence on the desorption process itself of the first adsorption / desorption element 131, and the first adsorption / desorption element 131 is regenerated to a considerable extent. This operation is performed until the desorption of the organic solvent from the first adsorption / desorption element 131 is almost completed and an equilibrium state is reached.

  Next, at the end stage of the desorption process period of the first adsorption / desorption element 131 accommodated in the second treatment tank 130 of the first adsorption / desorption treatment apparatus 100 (that is, between t1 and t2 shown in FIG. 2). When the valve V301 provided in the temperature adjustment mechanism 330A is closed and the valve V302 is opened, the carrier gas in a low temperature state containing the non-condensed organic solvent discharged from the condensation recovery apparatus 200 is connected to the piping line. The second adsorbing / desorbing element 321 is brought into contact with the second adsorbing / desorbing element 300 by being supplied to the processing tank 320 of the second adsorbing / desorbing apparatus 300 as it is via L6.

  As a result, the organic solvent contained in the carrier gas is adsorbed by the second adsorption / desorption element 321, and the concentration of the organic solvent in the carrier gas discharged from the processing tank 320 gradually decreases. In connection with this, the density | concentration of the organic solvent contained in the carrier gas made to contact the 1st adsorption / desorption element 131 accommodated in the 2nd processing tank 130 of the 1st adsorption / desorption processing apparatus 100 will also fall gradually. Thus, regeneration of the first adsorption / desorption element 131 is further promoted. This operation is performed until the desorption of the organic solvent by the first adsorption / desorption element 131 is almost completed and an equilibrium state is reached.

  When the organic solvent-containing gas processing system 1A in the present embodiment described above is used, the carrier gas containing the non-condensed organic solvent is circulated as it is and returned to the first adsorption / desorption processing apparatus 100. In comparison, the regeneration of the first adsorption / desorption elements 121 and 131 is promoted, and the organic solvent can be more efficiently adsorbed from the raw gas during the adsorption process performed thereafter. Therefore, the purification capacity for the raw gas and the recovery efficiency of the organic solvent are improved, and a high-performance organic solvent-containing gas treatment system can be obtained as compared with the prior art.

  In addition, the organic solvent-containing gas treatment system 1A in the present embodiment is configured to be able to repeatedly use a carrier gas by constructing a circulation path, so that it is excellent in economic efficiency. it can. Therefore, when an inert gas typified by nitrogen gas or the like is used as the carrier gas, an effect that the running cost can be suppressed can be obtained.

  The adsorption capacity of the second adsorption / desorption element 321 included in the second adsorption / desorption processing apparatus 300 is set higher than the adsorption capacity of the first adsorption / desorption elements 121 and 131 included in the first adsorption / desorption processing apparatus 100. As a result, the purification performance for the raw gas and the recovery efficiency of the organic solvent are stably realized. This is because the concentration of the organic solvent contained in the carrier gas supplied to the second adsorption / desorption element 321 at the end of the desorption process period of the first adsorption / desorption element 131 is the first adsorption / desorption element 121, 131. This is because the concentration is higher than the concentration of the organic solvent contained in the raw gas supplied to. Here, as a method of setting the adsorption capacity of the second adsorption / desorption element 321 higher than the adsorption capacity of the first adsorption / desorption element 121, 131, the specific surface area of the second adsorption / desorption element 321 is set to the first adsorption / desorption element 121, It is assumed that the specific surface area of 131 is larger.

(Embodiment 2)
FIG. 3 is a system configuration diagram of an organic solvent-containing gas processing system according to Embodiment 2 of the present invention. Hereinafter, with reference to this FIG. 3, the structure of the organic-solvent containing gas processing system 1B in this Embodiment is demonstrated.

  As shown in FIG. 3, the organic solvent-containing gas processing system 1B according to the present embodiment is circulated so that the carrier gas is circulated similarly to the organic solvent-containing gas processing system 1A according to the first embodiment described above. And a first adsorption / desorption processing device 100, a condensing / recovery device 200, a second adsorption / desorption processing device 300, and a blower 400 provided on the circulation route. Here, the circulation path is mainly configured by piping lines L3 to L7 shown in the drawing.

  Among these, the configurations of the adsorption / desorption treatment tower 310 and the blower 400 of the first adsorption / desorption treatment device 100, the condensation recovery device 200, and the second adsorption / desorption treatment device 300, the arrangement positions thereof on the circulation path, and the like are described above. This is the same as in the case of Form 1. On the other hand, the configuration of the temperature adjusting mechanism 330B as the second temperature adjusting means provided in the second adsorption / desorption processing device 300 and the arrangement position on the circulation path are different from those in the first embodiment. Yes.

  The temperature adjusting mechanism 330B is for adjusting the temperature of the carrier gas supplied to the second adsorption / desorption processing apparatus 300 alternately in time either to a high temperature state or a low temperature state, more specifically, , A process of adjusting the temperature of the carrier gas in a low temperature state containing the uncondensed organic solvent discharged from the condensation recovery device 200 to a high temperature state, and a high temperature state discharged from the first adsorption / desorption processing device 100 The process of adjusting the temperature of the carrier gas to a low temperature state is performed alternately in time and supplied to the second adsorption / desorption processing tower 310.

  The temperature adjustment mechanism 330B is provided in the heater 331 provided on the pipe line L5, the pipe line L6 as a bypass line provided so as to branch from the pipe line L4 and join the pipe line L5, and the pipe line L6. The cooler 332, the valve V303 provided in the piping line L4, and the valve V304 provided in the piping line L6 are included. The valve V303 is provided in a part of the piping line L4 that runs parallel to the piping line L6 provided by branching from the piping line L4, and the heater 331 is provided by a piping line provided by branching from the piping line L4. It is provided in the piping line L5 of the part running in parallel with L6. Further, both the cooler 332 and the valve V304 are provided in the piping line L6.

  Here, the heater 331 adjusts the temperature of the low-temperature carrier gas containing the non-condensed organic solvent discharged from the condensing and collecting apparatus 200 to a high temperature and supplies the carrier gas to the second adsorption / desorption treatment tower 310. The carrier gas introduced into the processing tank 320 is heated so that the second adsorption / desorption element 321 is maintained at a predetermined desorption temperature.

  On the other hand, when the cooler 332 adjusts the temperature of the carrier gas discharged from the first adsorption / desorption treatment device 100 to a low temperature and supplies it to the second adsorption / desorption treatment tower 310, the second adsorption / desorption is performed. The carrier gas introduced into the processing tank 320 is cooled so that the element 321 is maintained at a predetermined adsorption temperature.

  Here, the details of the processing of the organic solvent-containing gas performed in the organic solvent-containing gas processing system 1B in the present embodiment are the same as those in the first embodiment described above, and therefore the description thereof is omitted here. However, the operation performed in the organic solvent-containing gas processing system 1B in the present embodiment in order to specifically realize the processing of the organic solvent-containing gas is somewhat different from that in the first embodiment described above, This point will be described in detail with reference to FIG. The following description is based on the state where the first treatment tank 120 of the first adsorption / desorption treatment apparatus 100 functions as an adsorption tank and the second treatment tank 130 functions as a desorption tank. The same operation is performed when the adsorption tank and the desorption tank are switched.

  As shown in FIG. 2, the first stage of the desorption process period of the first adsorption / desorption element 131 accommodated in the second treatment tank 130 of the first adsorption / desorption treatment apparatus 100 (that is, t0 to t1 shown in FIG. 2). In the middle), the valve V303 provided in the temperature adjustment mechanism 330B is opened and the valve V304 is closed, so that the carrier in a low temperature state containing the non-condensed organic solvent discharged from the condensing recovery device 200 The gas is introduced into the heater 331 and heated to a high temperature state to adjust the temperature, and is supplied to the treatment tank 320 of the second adsorption / desorption treatment apparatus 300 to be brought into contact with the second adsorption / desorption element 321.

  As a result, the adsorbed organic solvent of the second adsorption / desorption element 321 is desorbed from the second adsorption / desorption element 321 by the high-temperature carrier gas, and the organic in the carrier gas discharged from the processing tank 320 is removed. The solvent concentration gradually increases. In connection with this, the density | concentration of the organic solvent contained in the carrier gas made to contact the 1st adsorption / desorption element 131 accommodated in the 2nd processing tank 130 of the 1st adsorption / desorption processing apparatus 100 also rises gradually. However, there is almost no influence on the desorption process itself of the first adsorption / desorption element 131, and the first adsorption / desorption element 131 is regenerated to a considerable extent. This operation is performed until the desorption of the organic solvent from the first adsorption / desorption element 131 is almost completed and an equilibrium state is reached.

  Next, at the end stage of the desorption process period of the first adsorption / desorption element 131 accommodated in the second treatment tank 130 of the first adsorption / desorption treatment apparatus 100 (that is, between t1 and t2 shown in FIG. 2). When the valve V303 provided in the temperature adjustment mechanism 330B is closed and the valve V304 is opened, the high-temperature carrier gas discharged from the first adsorption / desorption processing device 100 is introduced into the cooler 332. The temperature is adjusted by cooling to a low temperature state, and this is supplied to the treatment tank 320 of the second adsorption / desorption treatment apparatus 300 so as to be brought into contact with the second adsorption / desorption element 321.

  As a result, the organic solvent contained in the carrier gas is adsorbed by the second adsorption / desorption element 321, and the concentration of the organic solvent in the carrier gas discharged from the processing tank 320 gradually decreases. In connection with this, the density | concentration of the organic solvent contained in the carrier gas made to contact the 1st adsorption / desorption element 131 accommodated in the 2nd processing tank 130 of the 1st adsorption / desorption processing apparatus 100 will also fall gradually. Thus, regeneration of the first adsorption / desorption element 131 is further promoted. This operation is performed until the desorption of the organic solvent by the first adsorption / desorption element 131 is almost completed and an equilibrium state is reached.

  At that time, when the carrier gas in a high temperature state discharged from the first adsorption / desorption treatment apparatus 100 is cooled by the cooler 332, the organic solvent contained in the carrier gas may be condensed. However, if the desorption of the organic solvent from the first adsorption / desorption element 131 is almost completed and has reached an equilibrium state at the beginning of the desorption process period of the first adsorption / desorption element 131 described above, the condenser of the condensation recovery apparatus 200 Since the vapor-liquid equilibrium state of the organic solvent in the temperature state after cooling is already maintained by the condensation treatment by 210, the vapor-liquid equilibrium of the organic solvent contained in the carrier gas even after cooling by the cooler 332 The state is maintained and the organic solvent is not condensed.

  However, if the temperature of the carrier gas after cooling by the cooler 332 is set lower than the temperature of the carrier gas after cooling by the condenser 210, the organic solvent may be condensed in the cooler 332. If the cooler 332 is connected to the recovery tank 220, the condensed organic solvent can be recovered in the recovery tank 220.

  Even when the organic solvent-containing gas processing system 1B in the present embodiment described above is used, the same effects as those in the case of the organic solvent-containing gas processing system 1A in the first embodiment described above can be obtained. That is, by using the organic solvent-containing gas treatment system 1B according to the present embodiment, the purification ability for the raw gas and the recovery efficiency of the organic solvent are improved, and the organic solvent-containing performance is higher than that of the prior art. While being able to set it as a gas processing system, it can be excellent also in economical efficiency.

(Example)
In the following, an example in which the organic solvent-containing gas processing system 1B according to Embodiment 2 of the present invention described above is actually made as a trial and the raw gas is processed using the system will be described as an example.

In the examples, a gas at 30 ° C. containing ethyl acetate at a concentration of 2000 ppm is used as the raw gas, nitrogen gas at 130 ° C. is used as the carrier gas, and the specific surface area of the first adsorption / desorption elements 121 and 131 is 1500 mg. / m ² use of activated carbon fibers, the specific surface area as a second adsorption and desorption device 321 using activated carbon fibers of 2000 mg / m ^2.

First, as an initial process, the raw gas was sucked into one of the treatment tanks of the first adsorption / desorption treatment apparatus 100 using a blower (not shown) for 20 minutes at an air volume of 100 m ³ / min to perform an adsorption treatment.

  After the process in the initial stage was completed, the raw gas was processed by continuously repeating a series of processes described below as one cycle.

Specifically, the valves V101 to V106 were switched to switch the one processing tank to a desorption tank, and the remaining processing tank was used as an adsorption tank. In the desorption tank, the first adsorption / desorption element was desorbed by introducing nitrogen gas at an air volume of 34 m ³ / min. In the adsorption tank, the adsorption process was performed under the same conditions as described above. In the condensation recovery apparatus 200, the 130 ° C. nitrogen gas containing ethyl acetate discharged from the desorption tank is cooled to 10 ° C.

  Here, for the first 10 minutes starting from the time when the desorption in the desorption tank is started, 10 ° C. nitrogen gas containing uncondensed ethyl acetate discharged from the condenser 210 is heated to 130 ° C. using the heater 331. The heat was introduced into the treatment tank 320 of the second adsorption / desorption treatment apparatus 300, and the gas discharged from the treatment tank 320 was introduced into the desorption tank of the first adsorption / desorption treatment apparatus 100.

  In addition, for the last 10 minutes after 10 minutes from the start of desorption in the desorption tank, 130 ° C. containing ethyl acetate discharged from the desorption tank by switching the valves V303 and V304. The nitrogen gas is cooled to 10 ° C. using a cooler 332, introduced into the treatment tank 320 of the second adsorption / desorption treatment apparatus 300, and the gas discharged from the treatment tank 320 is desorbed from the first adsorption / desorption treatment apparatus 100. We decided to introduce it into the tank.

  When one cycle described above is continuously repeated, the concentration of ethyl acetate contained in the clean gas discharged from the first adsorption / desorption treatment apparatus 100 is reduced to about 20 ppm. confirmed. That is, in the Example, it was confirmed that ethyl acetate could be removed with a high removal rate of about 99%.

  In addition, at the time when the first 10 minutes starting from the time when the desorption in the desorption tank described above is started, it is included in the nitrogen gas flowing through the part of the piping line L4 introduced into the condensing and collecting apparatus 200. It was confirmed that the concentration of ethyl acetate increased to about 65000 ppm. At that time, it is confirmed that the concentration of ethyl acetate contained in the nitrogen gas flowing through the piping line L5 of the portion discharged from the condensing and collecting apparatus 200 is about 59000 ppm, and the second adsorption / desorption treatment is performed. It was confirmed that the concentration of ethyl acetate contained in the nitrogen gas flowing through the piping line L7 of the part discharged from the apparatus 300 was about 59000 ppm.

  On the other hand, at the time when the last 10 minutes starting from 10 minutes after the start of desorption in the above-described desorption tank is completed, the piping line L7 of the portion discharged from the second adsorption / desorption processing device 300 is removed. It was confirmed that the concentration of ethyl acetate contained in the flowing nitrogen gas was reduced to about 2000 ppm. That is, it was confirmed that the regeneration of the first adsorption / desorption element 131 is promoted in the last 10 minutes starting from 10 minutes after the start of desorption in the desorption tank.

  From the above results, according to the present invention, it is possible to remove ethyl acetate as the organic solvent contained in the raw gas at a high removal rate, and to improve the recovery efficiency of the ethyl acetate. Confirmed experimentally.

  In the above-described organic solvent-containing gas processing systems 1A and 1B according to the first and second embodiments of the present invention, constituent elements such as a fluid transfer means such as a blower and a pump and a fluid storage means such as a storage tank are required as a minimum. However, these components may be arranged at appropriate positions as necessary.

  In addition, the organic solvent-containing gas processing systems 1A and 1B according to Embodiments 1 and 2 of the present invention described above include two processing tanks in which the first adsorption / desorption elements are accommodated as the first adsorption / desorption treatment apparatus. In addition, the above description has been made by exemplifying what is configured such that the gas to be processed can be continuously processed by being alternately switched to the adsorption tank and the desorption tank in terms of time. When it is not necessary to process the adsorption / desorption treatment apparatus, the adsorption / desorption treatment apparatus may comprise a single treatment tank. In addition, when it is necessary to continuously process the gas to be processed, a part of the first adsorption element is used as an adsorption treatment zone in place of the above-described switchable first adsorption / desorption treatment device, and the first Adsorption / desorption processing apparatus equipped with a rotary adsorbent configured such that the remaining portion of the adsorbing element is used as a desorption processing zone, and the adsorption processing zone and the desorption processing zone move gradually with the rotation of the adsorbent. This may be configured as follows.

  As described above, the above-described embodiments and examples disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1A, 1B Organic solvent containing gas processing system, 100 1st adsorption / desorption processing apparatus, 110 1st adsorption / desorption processing tower, 120 1st treatment tank, 121 1st adsorption / desorption element, 130 2nd treatment tank, 131 1st adsorption / desorption Element, 140 Heater, 200 Condensation recovery device, 210 Condenser, 220 Recovery tank, 300 Second adsorption / desorption treatment device, 310 Second adsorption / desorption treatment tower, 320 Treatment tank, 321 Second adsorption / desorption device, 330A, 330B Temperature adjustment mechanism 331 heater, 332 cooler, 400 blower, L0-L9 piping line, V101-V106, V301-V304 valves.

Claims (6)

An organic solvent-containing gas processing system that cleans and discharges the raw gas by separating the organic solvent from the raw gas containing the organic solvent, and recovers the organic solvent separated from the raw gas using a carrier gas,
A circulation path through which the carrier gas circulates;
A first adsorption / desorption treatment apparatus including a first adsorption / desorption element provided on the circulation path and configured to adsorb and desorb an organic solvent;
A condensing and collecting device provided on the circulation path and recovering the organic solvent as a condensate by condensing the organic solvent;
A second adsorption / desorption treatment device including a second adsorption / desorption element provided on the circulation path and adsorbing and desorbing an organic solvent;
The first adsorption / desorption processing device further includes first temperature adjusting means for adjusting the temperature of the carrier gas discharged from the second adsorption / desorption processing device in a high temperature state or a low temperature state to a high temperature state, and the raw gas And the carrier gas, which has been temperature-controlled by the first temperature adjusting means and is in a high temperature state, are alternately brought into contact with the first adsorption / desorption element in terms of time so that the organic solvent is in a high-temperature state from the original gas. Move to the carrier gas at
The condensing and collecting device condenses the organic solvent by adjusting the temperature of the carrier gas discharged from the first adsorption / desorption treatment device to a low temperature state,
The second adsorption / desorption treatment device adjusts the temperature of the carrier gas in a low temperature state including the non-condensed organic solvent discharged from the condensing / recovery device alternately in time to either a high temperature state or a low temperature state. Second carrier temperature control means, and a carrier gas temperature-adjusted by the second temperature control means and in a high temperature state, and a carrier gas temperature controlled by the second temperature control means and in a low temperature state. And the organic solvent is moved from a carrier gas in a low temperature state to a carrier gas in a high temperature state by contacting the second adsorption / desorption element alternately with time.
The second temperature adjusting means is a carrier in a low temperature state containing the uncondensed organic solvent discharged from the condensation recovery device at the beginning of a desorption process period in which the organic solvent is desorbed from the first adsorption / desorption element. The temperature of the gas is adjusted to a high temperature state, and at the end of the desorption treatment period in which the organic solvent is desorbed from the first adsorption / desorption element, the gas is brought into a low temperature state including the uncondensed organic solvent discharged from the condensation recovery device. An organic solvent-containing gas treatment system that adjusts the temperature of a carrier gas to a low temperature. An organic solvent-containing gas processing system that cleans and discharges the raw gas by separating the organic solvent from the raw gas containing the organic solvent, and recovers the organic solvent separated from the raw gas using a carrier gas,
A circulation path through which the carrier gas circulates;
A first adsorption / desorption treatment apparatus including a first adsorption / desorption element provided on the circulation path and configured to adsorb and desorb an organic solvent;
A condensing and collecting device provided on the circulation path and recovering the organic solvent as a condensate by condensing the organic solvent;
A second adsorption / desorption treatment device including a second adsorption / desorption element provided on the circulation path and adsorbing and desorbing an organic solvent;
The first adsorption / desorption processing device further includes first temperature adjusting means for adjusting the temperature of the carrier gas discharged from the second adsorption / desorption processing device in a high temperature state or a low temperature state to a high temperature state, and the raw gas And the carrier gas, which has been temperature-controlled by the first temperature adjusting means and is in a high temperature state, are alternately brought into contact with the first adsorption / desorption element in terms of time so that the organic solvent is in a high-temperature state from the original gas. Move to the carrier gas at
The condensing and collecting device condenses the organic solvent by adjusting the temperature of the carrier gas discharged from the first adsorption / desorption treatment device to a low temperature state,
The second adsorption / desorption treatment device includes a treatment for adjusting the temperature of a low-temperature carrier gas containing an uncondensed organic solvent discharged from the condensation recovery device to a high temperature state, and the first adsorption / desorption treatment device. A second temperature adjusting means for alternately adjusting the temperature of the discharged carrier gas in a high temperature state to a low temperature state without passing through the condensing and collecting device; The second adsorbing / desorbing element alternately changes in time with a carrier gas that has been adjusted in temperature by the adjusting means and is in a high temperature state and a carrier gas that has been adjusted in temperature by the second temperature adjusting means and is in a low temperature state. The organic solvent is moved from the carrier gas in a low temperature state to the carrier gas in a high temperature state by contacting with
The second temperature adjusting means is a carrier in a low temperature state containing the uncondensed organic solvent discharged from the condensation recovery device at the beginning of a desorption process period in which the organic solvent is desorbed from the first adsorption / desorption element. The carrier gas in a high temperature state discharged from the first adsorption / desorption treatment apparatus is removed at the end of the desorption treatment period in which the temperature of the gas is adjusted to a high temperature and the organic solvent is desorbed from the first adsorption / desorption element. An organic solvent-containing gas processing system that adjusts the temperature to a low temperature without going through the condensation recovery apparatus.   The organic solvent-containing gas processing system according to claim 1, wherein the carrier gas is an inert gas.   The organic solvent-containing gas treatment system according to any one of claims 1 to 3, wherein the first adsorption / desorption element is an activated carbon fiber.   The organic solvent-containing gas treatment system according to any one of claims 1 to 4, wherein the second adsorption / desorption element is an activated carbon fiber. The first adsorption / desorption element and the second adsorption / desorption element are both activated carbon fibers,
The organic solvent-containing gas treatment according to any one of claims 1 to 3, wherein a specific surface area of the activated carbon fiber as the second adsorption / desorption element is larger than a specific surface area of the activated carbon fiber as the first adsorption / desorption element. system.

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