WO2008023659A1 - Appareil pour le traitement de gaz contenant des substances organiques et son procédé de traitement - Google Patents

Appareil pour le traitement de gaz contenant des substances organiques et son procédé de traitement Download PDF

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Publication number
WO2008023659A1
WO2008023659A1 PCT/JP2007/066107 JP2007066107W WO2008023659A1 WO 2008023659 A1 WO2008023659 A1 WO 2008023659A1 JP 2007066107 W JP2007066107 W JP 2007066107W WO 2008023659 A1 WO2008023659 A1 WO 2008023659A1
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WO
WIPO (PCT)
Prior art keywords
gas
activated carbon
organic
organic matter
organic substance
Prior art date
Application number
PCT/JP2007/066107
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English (en)
Japanese (ja)
Inventor
Kenji Nakashima
Original Assignee
Kenji Nakashima
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kenji Nakashima filed Critical Kenji Nakashima
Publication of WO2008023659A1 publication Critical patent/WO2008023659A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/38—Removing components of undefined structure
    • B01D53/44—Organic components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81—Solid phase processes
    • B01D53/82—Solid phase processes with stationary reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/30—Physical properties of adsorbents
    • B01D2253/34—Specific shapes
    • B01D2253/342—Monoliths
    • B01D2253/3425—Honeycomb shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/708—Volatile organic compounds V.O.C.'s
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/80—Water

Definitions

  • the present invention relates to an organic substance-containing gas processing facility and a processing method thereof, and more particularly to an organic substance-containing gas processing facility and a processing method thereof, which mainly process a gas containing a low concentration and a large amount of a hydrophilic organic substance.
  • Patent Document 1 A method using fibrous activated carbon instead of granular activated carbon has been considered (for example, Patent Document 1). This method also has a problem that workability is inferior because it cannot withstand long-term use, which is likely to be clogged by dust in the processing gas with high ventilation resistance, and requires frequent maintenance and inspection.
  • Patent Document 2 As a method for reducing the airflow resistance, a method using honeycomb-like activated carbon is also considered (for example, Patent Document 2).
  • the above-described conventional method using the honeycomb-shaped activated carbon reaches the explosion limit depending on the organic matter when the heated hot air to be dried is supplied after passing water vapor to collect the adsorbed organic matter. Therefore, the inventors of the present application have invented an organic substance-containing gas treatment facility and a treatment method for solving the problem (Patent Document 3).
  • Patent Document 1 Japanese Patent Laid-Open No. 11239723
  • Patent Document 2 Japanese Patent Laid-Open No. 10-216477
  • Patent Document 3 Japanese Patent Laid-Open No. 2006-88102
  • the moisture contained in the organic solvent recovered by the above-mentioned conventional processing equipment is also affected by the relative humidity in the atmosphere, and even when the relative humidity is low, the dissolved moisture contained in the organic solvent is 1.5. It is contained in an amount of about% by weight, usually about 2 to 3% by weight.
  • the object of the present invention is to the extent that bleeding does not easily occur even when a gas containing a hydrophilic organic substance is recovered and the organic substance is reused for printing ink. Contained (dissolved) water content can be drastically reduced, so it is possible to effectively absorb and desorb gas containing low concentrations and large amounts of organic matter and efficiently recover organic matter, and to explode. It is an object of the present invention to provide an organic substance-containing gas treatment facility and a treatment method capable of reliably preventing this.
  • the characteristic configuration of the organic substance-containing gas processing facility according to the present invention includes a dehumidifying mechanism for removing moisture contained in the gas to be processed containing organic substances, and an organic substance in the dehumidified gas to be adsorbed and removed.
  • heated gas supply device for supplying heated inert gas to desorb organic substances adsorbed by the activated carbon adsorbing device from activated carbon
  • the object of the present invention is to have a cooling device that cools and dehydrates the organic matter desorbed by the heated inert gas to less than zero degrees, and a recovery device that recovers the dehydrated organic matter.
  • the moisture in the organic matter contained in the inert gas can be removed by the cooling device that cools and dehydrates at a low rate, so the moisture in the collected organic matter can be sufficiently reduced, and the gas containing hydrophilic organic matter is recovered.
  • the cooling device that cools and dehydrates at a low rate, so the moisture in the collected organic matter can be sufficiently reduced, and the gas containing hydrophilic organic matter is recovered.
  • the activated carbon adsorption device uses honeycomb-like activated carbon, the ventilation resistance can be reduced and the adsorption rate is high, so that it is efficient even when processing a large amount of low-concentration gas.
  • An inert gas is allowed to flow to desorb the organic matter adsorbed on the substrate, so that the desorbed organic matter can be prevented from igniting and the explosion can be reliably prevented, and the organic matter can be easily recovered. Therefore, large-scale equipment such as a distillation tower is not required.
  • nitrogen is used for desorption of organic substances, water treatment is not necessary compared to the case of using water vapor as in the prior art.
  • the dehumidifying mechanism has a precooler configured with a heat exchanger that receives supply of refrigerant, and a dehumidifying device that follows the precooler, and the dehumidifying device is rotatable in the cylindrical container.
  • the molecular sieves or zeolite are composed of honeycomb rotors arranged in a honeycomb shape.
  • the gas to be processed cooled to a low temperature by the precooler is further added to the moles. Since the molecular sieves or zeolite are dehumidified by the honeycomb rotor arranged in the form of honeycomb, and a stable low dew point is sent to the downstream side, each device installed on the downstream side makes the moisture in the organic matter Is more reliably removed and reduced.
  • the inert gas is nitrogen, and the nitrogen is heated and sent to the activated carbon adsorption device to desorb organic matter, and the desorbed organic matter is sent to the cooling device. It is preferable to heat up the route to be fed and to introduce nitrogen! /, Nitrogen! /
  • the organic substance-containing gas treatment method according to the present invention is characterized in that the moisture contained in the gas to be treated containing organic substances is removed by a dehumidifying mechanism, and the organic matter in the gas to be treated that has been dehumidified is removed.
  • the organic substance desorbed by the inert gas is to be dehydrated by freezing to below zero degree with a cooling device, and the dehydrated organic substance is recovered.
  • Moisture removal in the gas to be treated by the dehumidifying mechanism is performed by passing the gas to be treated through a precooler configured from a heat exchanger that receives a refrigerant and a dehumidifier following the precooler, It is made up of a honeycomb rotor in which molecular sieves or zeolite are arranged in a honeycomb shape so that it can rotate in a cylindrical container!
  • each device disposed on the downstream side of the dehumidifying mechanism can more reliably remove and reduce water in the organic matter.
  • FIG. 1 is a schematic overall flow diagram of an organic substance-containing gas processing facility according to an embodiment of the present invention.
  • FIG. 1 shows a schematic overall configuration of an organic substance-containing gas processing facility according to this embodiment.
  • FIG. 1 shows a schematic structure of the organic substance-containing gas treatment facility. That is, the gas to be processed (organic substance-containing gas) generated by various chemical fields and the like is fed by the feed fan 1 to the precooler 2a and the subsequent dehumidifier 2b constituting the dehumidifying mechanism 2. The gas to be treated whose moisture has been dehumidified by the dehumidifying mechanism 2 is sent to an activated carbon adsorption device 4 that adsorbs and removes organic substances.
  • the gas to be processed organic substance-containing gas generated by various chemical fields and the like is fed by the feed fan 1 to the precooler 2a and the subsequent dehumidifier 2b constituting the dehumidifying mechanism 2.
  • the gas to be treated whose moisture has been dehumidified by the dehumidifying mechanism 2 is sent to an activated carbon adsorption device 4 that adsorbs and removes organic substances.
  • this organic matter-containing gas treatment facility is equipped with a device 5 for supplying heated inert gas to desorb the organic matter adsorbed by the activated carbon adsorbing device 4 from the activated carbon, and a degassing by the heated inert gas.
  • the apparatus includes a cooling device 6 that cools the separated organic matter to below zero degree and dehydrates it, a recovery device 7 that collects the dehydrated organic matter, and the like.
  • the precooler 2a is constituted by a heat exchanger, and the refrigerant is supplied from the blownler 10. In this heat exchanger, the refrigerant is fed and circulated through the pipe 11 by the pump P1 from the blower 10 that cools the refrigerant (brine) sent from the brine storage tank T.
  • the dehumidifying device 2b following the precooler 2a includes, for example, a rotor (no, two-cam rotor) in which molecular sieves or zeolites arranged in a honeycomb shape are rotatably accommodated in a cylindrical container.
  • the gas to be treated passes through the slow rotation (for example, about 10 revolutions / hour), so that the moisture in the gas to be treated is removed while the gas is removed in a sealed and separated path.
  • the slow rotation for example, about 10 revolutions / hour
  • warm air about 110 to 150 ° C.
  • a regeneration fan not shown
  • the power S can be adjusted to bring the gas to be treated to a stable low dew point (eg, 30 ° C or less).
  • a prefilter made of various types of commercially available dust removing filters or the like may be disposed in advance.
  • the gas to be treated that has passed through the dehumidifying mechanism 2 is sent to a plurality of activated carbon adsorption devices 4 through a control valve 3.
  • a control valve 3 In FIG. 1, two activated carbon adsorption devices 4 are arranged in parallel, and in this way, one can be used for adsorption and the other can be used for desorption / regeneration.
  • the number of activated carbon adsorption devices 2 may be one or more, and the number, specifications, etc., may be selected appropriately depending on the amount of gas to be treated and the characteristics.
  • the activated carbon adsorbing device 4 is filled and fitted with honeycomb-like activated carbon and does not use granular activated carbon or fibrous activated carbon as in the prior art. Therefore, the activated carbon adsorbing device 4 has a small ventilation resistance. It is characterized by low pressure loss and high adsorption capacity. Since the pressure loss of the honeycomb-like activated carbon is small, the power source of the feeding fan 1 can be small and consumes less energy.
  • the activated carbon adsorbing device 4 may have various configurations. For example, the activated carbon adsorbing device 4 is configured by stacking about 90 to 450 mm of honeycomb-shaped activated carbon on a unit having a perforated plate and a fluid jacket.
  • honeycomb specific surface area of activated carbon about 200 ⁇ 3000m 2 / it is preferable to g using of about instrument about 300 ⁇ 2500m 2 / g approximately and more preferably tool 400 to use a It is even more preferable to use a material of about ⁇ 2000 m 2 / g.
  • the through-holes of the honeycomb-like activated carbon are not limited to hexagonal shapes, and may be various shapes such as square, rectangle, polygon, circle, and substantially circle.
  • There are many through holes (cells) It is preferable that the amount of contact with the number of treatments is large and the adsorptive capacity is high. However, when the number of pores is too large, the pressure loss increases and the manufacturing becomes difficult and the cost increases. Accordingly, the number of the through holes is about 15 to 2326/10 cm 2 force S, preferably about 30 to about 1550/10 cm 2 , more preferably about 39 to about 1162/10 cm 2 .
  • the method for producing the honeycomb-shaped activated carbon is not particularly limited.
  • the activated carbon raw material is added with a binder, formed into a honeycomb shape, activated by carbonization, and then washed with an acid if necessary.
  • the activated carbon itself is formed into a honeycomb and then dried and fired.
  • the treated exhaust gas from which the organic matter has been adsorbed and removed by the activated carbon adsorbing device 4 is then released into the atmosphere via the control valve 5, and the organic matter remaining in the treated exhaust gas is not less than the emission standard value. In this case, it is discharged after further detoxification treatment.
  • a device for separating and collecting the organic matter adsorbed on the honeycomb-like activated carbon is provided on the downstream side of the activated carbon adsorption device 4.
  • the relationship between the linear flow velocity (LVa) of the gas to be treated that flows through the honeycomb-shaped activated carbon and the linear velocity (LVb) of the gas when the organic matter is desorbed from the honeycomb-like activated carbon that has adsorbed the organic matter is important.
  • organic substances adsorbed on the honeycomb-like activated carbon can be efficiently desorbed.
  • a treatment gas containing an organic substance is passed through honeycomb activated carbon at a linear velocity of 30 to 300 cm / second, and desorption nitrogen is passed at 1/10 to 1 / 10,000 of this linear velocity.
  • the organic substance detachment from the honeycomb activated carbon adsorbing the organic substance is conventionally performed by supplying pressurized steam of about 1.9 atmospheres heated to about 130 ° C, and dried with hot air after the detachment.
  • the organic substance is benzene, toluene or xylene (so-called BTX) with a particularly low boiling point
  • BTX benzene, toluene or xylene
  • the explosion limit may be reached with the hot air sent for drying. For this reason, there was a problem that it was necessary to install explosion-proof equipment and other equipment that would be difficult to work with, such as careful attention.
  • nitrogen which is an inert gas
  • inert gas is heated to about 90 to 110 ° C, preferably about 100 ° C, and is sent. Yes.
  • other inert gas may be used instead of nitrogen.
  • nitrogen is fed from a nitrogen container (such as a gas cylinder or a liquid nitrogen container) 12 through a control valve to a heat transfer oil tank 7 by a nitrogen gas circulation fan 6, and heat is exchanged to form a honeycomb. Heated to a temperature slightly higher than the boiling point of the organic matter adsorbed on the activated carbon, flows through the pipe 20 and is sent to the activated carbon adsorption device 4 via the control valve 8.
  • the amount of heat in the heat transfer oil tank 7 can be obtained by heating directly or indirectly by attaching a heater 24 or the like.
  • the heat medium in the heat medium oil tank 7 is circulated by the pump P2 and maintained at a predetermined temperature.
  • the heat quantity in the heat transfer oil tank 7 may be supplied by using heat generated from other heat sources in the factory. It is not necessary to use the nitrogen gas circulation fan 6 to feed nitrogen, but other feeding means may be used.
  • the nitrogen container 12, the nitrogen gas circulation pump 6, the heat transfer oil tank 7, and the like constitute a heated gas feeding device.
  • the organic matter adsorbed on the honeycomb activated carbon of the activated carbon adsorbing device 4 is desorbed by heated nitrogen, and is fed together with nitrogen through the desorption nitrogen control valve 9 to the first cooler 13 to be cooled somewhat. .
  • the refrigerant is supplied and circulated from the first chiller unit 16 to the first cooler 13 by the heat exchanger cooling water circulation pump P3.
  • Figure 17 is a cooling water tank equipped with a supply pump P4 for storing cooling water to be sent to the first chiller unit 16.
  • the organic substance desorbed from the honeycomb-shaped activated carbon with heated nitrogen is introduced into the first cooler 13 through a pipe 21 that does not heat a part of nitrogen from the nitrogen container 12. Is preferred. In this way, the heat consumption in the first cooler 13 can be reduced, and the heat utilization rate of the entire equipment is increased, resulting in energy saving.
  • Figure 22 shows a cooling valve that controls the amount of cooling nitrogen introduced.
  • nitrogen containing organic matter is fed into a plurality of narrow tubes arranged inside the second cooler 14 to be cooled, and the organic matter is liquefied.
  • the second cooler 14 cools the nitrogen containing the organic matter to below zero degree, preferably below 10 ° C., so that the water in the nitrogen is frozen on the surface of the capillary tube and separated and removed.
  • two second coolers 14 may be arranged in parallel to increase the efficiency of moisture removal, or may be further increased.
  • FIG. 23 is a control valve that controls the nitrogen supply.
  • the liquid organic matter is further sent to a collection tank 15 such as a decanter and collected as a high-purity organic matter.
  • a collection tank 15 such as a decanter and collected as a high-purity organic matter.
  • the first and second coolers 13 and 14 constitute a cooling device
  • the decanter 15 constitutes a recovery device.
  • other recovery means that do not necessarily need to be the decanter 15 may be used.
  • the refrigerant is fed from the second chiller unit 18 via the heat exchanger 19, and is circulated by the brine circulation pump P5.
  • an exhaust gas containing ethyl acetate is treated as an organic substance-containing gas that is a gas to be treated.
  • the relative humidity in the atmosphere is approximately 60%, and the exhaust gas flow rate (approximately 300 Nm 3 / h) containing ethyl acetate (approximately 2000 ppm by weight) is reduced to 5 ° C or less with a precooler as shown in Fig. 1.
  • the dew point was lowered to 30 ° C. or less with a honeycomb rotor as a dehumidifying device, and the dew point was fed to the activated carbon adsorbing device 4 incorporating the honeycomb-like activated carbon for adsorption.
  • the activated carbon adsorbing device 4 includes about 20,000 honeycomb activated carbons and has a size of 3,000 ⁇ 4,500 ⁇ height of 1,000 mm. First cooling of the activated carbon adsorbed with ethyl acetate by passing nitrogen heated to about 100 ° C to desorb the ethyl acetate and cooling the nitrogen containing organic matter to about 15 ° C or less. And then a second cooler 14 cooled to about -10 ° C. The liquid ethyl acetate finally recovered from the decanter was about 137 kg / h (recovery rate about 97%), and the dissolved water contained in this ethyl acetate was 0.35% by weight.
  • the present invention can be discharged from various chemical industries, food industries, paper industries, pharmaceutical industries, etc.
  • the present invention can be widely applied when processing gas containing equipment.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)
  • Drying Of Gases (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

L'invention concerne un appareil pour le traitement d'un gaz contenant des substances organiques. Un gaz contenant une substance organique hydrophile est collecté grâce à l'appareil et la teneur de la substance organique dans l'eau (dissoute) peut être grandement réduite de telle manière que quand elle est réutilisée dans une encre d'impression, il y ait moins de risque de coulure de l'encre. Malgré cela, une grande quantité du gaz contenant des substances organiques faiblement concentrées est effectivement adsorbé puis désorbé afin de recueillir la substance organique. L'appareil permet d'éviter à coup sûr le risque d'explosion. L'invention concerne également un procédé de traitement du gaz. L'appareil pour le traitement du gaz contenant des substances organiques comprend : un mécanisme de déshumidification (2) dans lequel l'eau contenue dans le gaz contenant des substances organiques à traiter est éliminée ; un dispositif d'adsorption au charbon actif (4) rempli de charbon actif à structure en nid d'abeille pour éliminer la substance organique dans le gaz déshumidifié par adsorption ; des dispositifs d'alimentation en gaz chauffé (6, 7 et 12) qui permettent d'envoyer un gaz inerte chauffé pour séparer du charbon actif la substance organique adsorbée par le dispositif d'adsorption au charbon actif (4) ; des dispositifs de refroidissement (13 et 14) dans lesquels la substance organique séparée par le gaz inerte chaud est refroidie à 0 degré ou moins en vue de la déshydrater ; et un dispositif de collecte (15) dans lequel est recueillie la substance organique déshydratée.
PCT/JP2007/066107 2006-08-21 2007-08-20 Appareil pour le traitement de gaz contenant des substances organiques et son procédé de traitement WO2008023659A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-224384 2006-08-21
JP2006224384A JP2008043920A (ja) 2006-08-21 2006-08-21 有機物含有ガス処理設備とその処理方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109045932A (zh) * 2018-09-20 2018-12-21 岭商（浙江）生物科技有限公司 一种鱼粉的尾气处理系统及其处理工艺

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102350204B (zh) * 2011-10-17 2013-07-10 沈阳环境科学研究院 挥发性有机废气的模块式吸收净化装置
CN103521027A (zh) * 2013-09-25 2014-01-22 江苏中远环保科技有限公司 一种除氧型油气回收方法及其装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6182825A (ja) * 1984-09-29 1986-04-26 Daikin Ind Ltd 溶剤回収装置
JPH0290921A (ja) * 1988-09-26 1990-03-30 Kobe Steel Ltd フロン含有ガス濃縮装置
JPH0342013A (ja) * 1989-07-06 1991-02-22 Kobe Steel Ltd 溶剤回収装置
JPH0515725A (ja) * 1991-07-09 1993-01-26 Kobe Steel Ltd 溶剤濃縮回収装置
JPH09141053A (ja) * 1995-05-10 1997-06-03 Mitsubishi Heavy Ind Ltd 揮発性有機物の回収方法
JP2006088102A (ja) * 2004-09-27 2006-04-06 Kenji Nakajima 有機物含有ガス処理設備と処理方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6182825A (ja) * 1984-09-29 1986-04-26 Daikin Ind Ltd 溶剤回収装置
JPH0290921A (ja) * 1988-09-26 1990-03-30 Kobe Steel Ltd フロン含有ガス濃縮装置
JPH0342013A (ja) * 1989-07-06 1991-02-22 Kobe Steel Ltd 溶剤回収装置
JPH0515725A (ja) * 1991-07-09 1993-01-26 Kobe Steel Ltd 溶剤濃縮回収装置
JPH09141053A (ja) * 1995-05-10 1997-06-03 Mitsubishi Heavy Ind Ltd 揮発性有機物の回収方法
JP2006088102A (ja) * 2004-09-27 2006-04-06 Kenji Nakajima 有機物含有ガス処理設備と処理方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109045932A (zh) * 2018-09-20 2018-12-21 岭商（浙江）生物科技有限公司 一种鱼粉的尾气处理系统及其处理工艺

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