JP6123178B2 - Methane adsorbent and methane adsorption removal method using the same - Google Patents
Methane adsorbent and methane adsorption removal method using the same Download PDFInfo
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Description
本発明は、空気、水素、希ガスなどに含まれる微量の炭化水素ガスを除去するゼオライト吸着剤およびそれを用いた炭化水素吸着除去方法に関するものである。 The present invention relates to a zeolite adsorbent that removes a trace amount of hydrocarbon gas contained in air, hydrogen, a rare gas, and the like, and a hydrocarbon adsorption removal method using the same.
混合ガスの分離方法としては、空気深冷分離方法、吸着分離方法などが挙げられるが、深冷分離方法はガス純度を高くできる半面、冷却が必要であることから装置が大型化しやすく、オンサイトでの設置が困難となる。吸着分離方法は深冷分離方法に比べて装置がコンパクトであり、オンサイトでの設置も可能となる利点があるが、分離効率の改善のため分離剤の性能向上が望まれていた。 Examples of the mixed gas separation method include an air cryogenic separation method and an adsorptive separation method, but the cryogenic separation method can increase the gas purity. It becomes difficult to install in The adsorptive separation method has an advantage that the apparatus is more compact than the cryogenic separation method and can be installed on site, but an improvement in the performance of the separating agent has been desired in order to improve the separation efficiency.
例えば、メタンの貯蔵、アルゴン中の微量メタンの吸着分離技術において、吸着剤として５Ａ型ゼオライト、Ｈ交換フェリエライト型ゼオライト、有機金属錯体、カーボンモレキュラーシーブ、メソポーラスシリカなどを使用する方法が開示されているものの、さらなる分離性能の改善が望まれていた（例えば、特許文献１〜５参照）。また、自動車排ガス中の微量炭化水素の吸着除去方法に関して、ゼオライトとしてはアンモニア交換ヒューランダイト型が提案されているものの、浄化性能の向上や低コスト化が望まれていた（例えば、特許文献６参照）。 For example, methods for using 5A zeolite, H-exchange ferrierite-type zeolite, organometallic complexes, carbon molecular sieves, mesoporous silica, etc. as adsorbents in methane storage and adsorption / separation techniques for trace amounts of methane in argon are disclosed. However, further improvement in separation performance has been desired (for example, see Patent Documents 1 to 5). In addition, regarding a method for adsorbing and removing trace hydrocarbons in automobile exhaust gas, although an ammonia exchange hulandite type has been proposed as zeolite, improvement in purification performance and cost reduction have been desired (see, for example, Patent Document 6). ).
ゼオライトとしてバリウム交換クリノプチロライトは公知であるものの、バリウム交換の最適値に関しては不明である。また、一酸化炭素や二酸化炭素は一般的なゼオライトに吸着し易いことも知られているが、ガス極性強度により炭化水素に関しては一般的なゼオライトでは吸着し難いことが問題となっている（例えば、特許文献７〜８、非特許文献１参照）。 Although barium exchanged clinoptilolite is known as a zeolite, the optimum value for barium exchange is unknown. Carbon monoxide and carbon dioxide are also known to be easily adsorbed on general zeolites, but due to gas polarity strength, hydrocarbons are difficult to adsorb on general zeolites (for example, And Patent Documents 7 to 8 and Non-Patent Document 1).
本発明は、炭化水素吸着剤およびそれを用いた炭化水素吸着除去方法を提供するものである。 The present invention provides a hydrocarbon adsorbent and a hydrocarbon adsorption removal method using the same.
本発明者らは、炭化水素吸着剤に関して検討した結果、クリノプチロライト型ゼオライトまたはフェリエライト型ゼオライトにおいて、イオン交換可能なカチオンとしてバリウムを含有する吸着剤が、ガス極性の小さい炭化水素に対しても優れた炭化水素吸着特性を発揮することを見出し、本発明を完成するに至った。 As a result of studies on hydrocarbon adsorbents, the present inventors have found that in clinoptilolite-type zeolite or ferrierite-type zeolite, an adsorbent containing barium as an ion-exchangeable cation is used for hydrocarbons having a small gas polarity. However, the present inventors have found that it exhibits excellent hydrocarbon adsorption characteristics and has completed the present invention.
以下、本発明について詳細に説明する。 Hereinafter, the present invention will be described in detail.
本発明の炭化水素吸着剤は、クリノプチロライト型ゼオライトまたはフェリエライト型ゼオライトにおいて、イオン交換可能なカチオンとしてバリウムを含有する吸着剤である。全カチオン量に対するバリウム含有量（以下、バリウムイオン交換率という）は５ｍｏｌ％以上、好ましくは２０ｍｏｌ％以上であり、バリウムイオン交換率の増加に伴い炭化水素の吸着量は顕著に増加する。また、バリウムイオン交換率が１００ｍｏｌ％であっても炭化水素の吸着能を示すが、９５ｍｏｌ％を超えると炭化水素の吸着量は一定となるため、経済的には９５ｍｏｌ％のバリウムイオン交換率で十分である。また、ゼオライトに含まれるバリウム以外の金属イオンとしては特に限定されないが、アルカリ金属および／またはアルカリ土金属が好ましく、具体的にはカルシウム、マグネシウム、リチウム、ナトリウム、カリウムが例示される。 The hydrocarbon adsorbent of the present invention is an adsorbent containing barium as an ion-exchangeable cation in clinoptilolite-type zeolite or ferrierite-type zeolite. The barium content relative to the total cation amount (hereinafter referred to as barium ion exchange rate) is 5 mol% or more, preferably 20 mol% or more, and the amount of adsorbed hydrocarbons increases remarkably as the barium ion exchange rate increases. In addition, even if the barium ion exchange rate is 100 mol%, the adsorption capacity of hydrocarbons is shown. However, if the barium ion exchange rate exceeds 95 mol%, the amount of adsorbed hydrocarbons becomes constant. It is enough. The metal ions other than barium contained in the zeolite are not particularly limited, but alkali metals and / or alkaline earth metals are preferable, and specific examples include calcium, magnesium, lithium, sodium, and potassium.
バリウムによるイオン交換は、バリウム塩水溶液と接触させることにより行うことができる。バリウム塩としては、塩化物、酢酸塩などが使用できる。バリウムによるイオン交換は１００℃以下の温度で行うことができ、回分式、流通式のいずれでも行うことができる。バリウムによるイオン交換は、クリノプチロライト型ゼオライトまたはフェリエライト型ゼオライトの粉末あるいは成形体のいずれの形状でも行うことが可能である。 Ion exchange with barium can be performed by contacting with an aqueous barium salt solution. As the barium salt, chloride, acetate and the like can be used. Ion exchange with barium can be performed at a temperature of 100 ° C. or lower, and can be performed either batchwise or flow-through. The ion exchange with barium can be performed in any form of powder or shaped body of clinoptilolite-type zeolite or ferrierite-type zeolite.
バリウム交換されたクリノプチロライト型ゼオライトまたはフェリエライト型ゼオライトは、余剰のバリウム水溶液を水で洗浄、乾燥した後に加熱して脱水することにより、吸着剤として使用可能となる。脱水する時の温度はゼオライト結晶が崩壊しない温度であれば特に限定されないが、６００℃以下が好ましい。脱水方法は乾燥空気を流通させる流通法あるいはバッチ式の電気炉を使用する方法が挙げられる。 The barium-exchanged clinoptilolite-type zeolite or ferrierite-type zeolite can be used as an adsorbent by heating and dehydrating an excess barium aqueous solution after washing with water and drying. The temperature at the time of dehydration is not particularly limited as long as the zeolite crystal does not collapse, but 600 ° C. or less is preferable. Examples of the dehydration method include a circulation method for circulating dry air or a method using a batch-type electric furnace.
本発明である炭化水素吸着剤は、粉末あるいは成形体のいずれの形状でも使用可能である。成形体とする時は、ゼオライトにバインダーおよび／または成形助剤を添加して球状、円柱状などの形状に成形する。バインダーとしてはカオリン、アタパルジャイト、セピオライト、モンモリロナイトなどの粘土鉱物、アルミナ、シリカなどが使用可能であり、添加量としてはゼオライトの絶乾重量１００重量部に対して１０重量部〜３０重量部の範囲が好ましい。成形助剤としてはカルボキシメチルセルロース（ＣＭＣ）、ポリビニルアルコールなどの有機物が使用可能である。成形体は０．５ｍｍ〜４ｍｍの大きさであれば使用可能である。 The hydrocarbon adsorbent according to the present invention can be used in any form of powder or compact. When forming a molded body, a binder and / or a molding aid is added to zeolite to form a spherical shape or a cylindrical shape. As the binder, clay minerals such as kaolin, attapulgite, sepiolite, montmorillonite, alumina, silica and the like can be used, and the addition amount ranges from 10 parts by weight to 30 parts by weight with respect to 100 parts by weight of the absolute dry weight of the zeolite. preferable. As the molding aid, organic substances such as carboxymethyl cellulose (CMC) and polyvinyl alcohol can be used. The molded body can be used if it has a size of 0.5 mm to 4 mm.
本発明の炭化水素吸着剤は、炭化水素を含有する混合ガスから炭化水素を吸着除去する方法に使用可能である。炭化水素としては、メタン、エタン、プロパン、ブタンが例示され、炭化水素以外のガスとしては、空気、窒素、水素、ヘリウム、アルゴンなどを少なくとも一種類以上含む成分が例示される。吸着除去方法としては、除去効率の観点から、炭化水素吸着剤をカラムに充填して混合ガスを流通させる方法が好ましい。吸着除去に用いる温度は０℃〜５０℃の範囲が好ましい。 The hydrocarbon adsorbent of the present invention can be used in a method for adsorbing and removing hydrocarbons from a mixed gas containing hydrocarbons. Examples of the hydrocarbon include methane, ethane, propane, and butane, and examples of the gas other than the hydrocarbon include components including at least one kind of air, nitrogen, hydrogen, helium, argon, and the like. As the adsorption removal method, from the viewpoint of removal efficiency, a method of filling a column with a hydrocarbon adsorbent and circulating a mixed gas is preferable. The temperature used for adsorption removal is preferably in the range of 0 ° C to 50 ° C.
本発明の炭化水素吸着剤は、空気、水素、希ガスなどに含まれる微量の炭化水素ガスの吸着分離能力に優れていることから、ＰＳＡ法、ＴＳＡ法、ＰＴＳＡ法などの様々な分離プロセスに適用することができる。 The hydrocarbon adsorbent of the present invention is excellent in the adsorption separation ability of a small amount of hydrocarbon gas contained in air, hydrogen, rare gas, etc., so that it can be used in various separation processes such as PSA method, TSA method, PTSA method. Can be applied.
以下、実施例により本発明をさらに具体的に説明するが、本発明はこれらに限定されるものではない。 EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited thereto.
（組成分析）
試料をフッ酸溶液および硝酸にて溶解し、ＩＣＰ−ＡＥＳ（使用装置 ＰＥＲＫＩＮ ＥＬＭＥＲ社製 ＯＰＴＩＭＡ３０００ＤＶ）で測定した。アルカリ金属および／またはアルカリ土金属であるＢａ、Ｃａ、Ｍｇ、Ｎａ、Ｋ（以下、カチオンという）の全量に対する各カチオン濃度をｍｏｌ％で算出した。
(Composition analysis)
The sample was dissolved in a hydrofluoric acid solution and nitric acid, and measured with ICP-AES (OPTIMA 3000 DV manufactured by PERKIN ELMER). Each cation concentration with respect to the total amount of Ba, Ca, Mg, Na, and K (hereinafter referred to as cations) that are alkali metals and / or alkaline earth metals was calculated in mol%.
（クリノプチロライトの結晶含有率）
クリノプチロライトの結晶含有率の測定は、Ｘ線回折により行った。測定は、Ｘ線回折装置（マックサイエンス社製 ＭＸＰ３）を使用して２θ＝３°〜４０°の回折ピークを測定した。得られたＸ線回折図から、クリノプチロライトのピークと不純物相のピークの比より求めた。なお、クリノプチロライトの同定は、ＣＯＬＬＥＣＴＩＯＮ ＯＦ ＳＩＭＵＬＡＴＥＤ ＸＲＤ ＰＯＷＤＥＲ ＰＡＴＴＥＲＮＳ ＦＯＲ ＺＥＯＬＩＴＥＳ 、Ｆｉｆｔｈ Ｒｅｖｉｓｅｄ Ｅｄｉｔｉｏｎ ２００７、 ＥＬＳＥＶＩＡ の２０６頁〜２０７頁に記載されているＨＥＵ型ゼオライトのＸ線回折データを使用して行った。
(Crystal content of clinoptilolite)
The crystal content of clinoptilolite was measured by X-ray diffraction. For the measurement, a diffraction peak at 2θ = 3 ° to 40 ° was measured using an X-ray diffractometer (MXP3 manufactured by Mac Science). From the obtained X-ray diffraction pattern, it was determined from the ratio of the clinoptilolite peak to the impurity phase peak. The clinoptilolite was identified by X-ray diffraction of HEU-type zeolite using COLLECTION OF SIMULATED XRD POWDER PATTERNS FOR ZEOLITES, Fifth Revised Edition 2007, ELSEVIA pp. 206-207. .
（メタン吸着量）
静的吸着特性としてメタン吸着量を求めた。ＢＥＬＳＯＲＰ−２８ＳＡ（日本ベル株式会社製）を用いて、吸着温度２５℃におけるメタン吸着量（２ｍｍＨｇ）を求めた。試料（吸着剤）は、本発明粉体を圧力７００ｋｇ−ｆ／ｃｍ２で成形し、０．３５５ｍｍ〜０．５ｍｍ分級処理した打錠成形体を評価用に約０．５ｇ用い、メタン吸着量を求めた。
(Methane adsorption amount)
The amount of methane adsorbed was determined as static adsorption characteristics. Using BELSORP-28SA (manufactured by Nippon Bell Co., Ltd.), the methane adsorption amount (2 mmHg) at an adsorption temperature of 25 ° C. was determined. As a sample (adsorbent), about 0.5 g of a tableted molded product obtained by molding the powder of the present invention at a pressure of 700 kg-f / cm 2 and classified by 0.355 mm to 0.5 mm was used for evaluation. Asked.
実施例１
純水、水酸化ナトリウム水溶液、水酸化カリウム水溶液、ケイ酸ソーダと硫酸アルミニウムから調製した無定形アルミノシリケートゲルを下記の組成となるように混合し、原料混合物を得た。
Example 1
Amorphous aluminosilicate gel prepared from pure water, aqueous sodium hydroxide, aqueous potassium hydroxide, sodium silicate and aluminum sulfate was mixed so as to have the following composition to obtain a raw material mixture.
ＳｉＯ２／Ａｌ２Ｏ３＝１１．７
ＯＨ／ＳｉＯ２＝０．３４
Ｋ／（Ｋ＋Ｎａ）＝０．７０
Ｈ２Ｏ／ＳｉＯ２＝１５
得られた原料混合物に、種晶として天然クリノプチロライト（原料混合物に対して２重量％）を加え、攪拌しながら１５０℃で７２時間加熱した。冷却後、濾過、洗浄、乾燥してクリノプチロライト粉体を得た。
SiO 2 / Al 2 O 3 = 11.7
OH / SiO 2 = 0.34
K / (K + Na) = 0.70
H 2 O / SiO 2 = 15
To the obtained raw material mixture, natural clinoptilolite (2% by weight based on the raw material mixture) was added as seed crystals and heated at 150 ° C. for 72 hours with stirring. After cooling, it was filtered, washed and dried to obtain clinoptilolite powder.
得られたクリノプチロライト粉体は、以下の組成であった。 The obtained clinoptilolite powder had the following composition.
ＳｉＯ２／Ａｌ２Ｏ３＝９．８
（Ｎａ，Ｋ）２Ｏ／Ａｌ２Ｏ３＝０．９９
Ｋ／（Ｋ＋Ｎａ）＝０．９０
また、Ｘ線回折の結果、クリノプチロライト以外に帰属できるピークはなく、クリノプチロライトの結晶含有率は１００％であった。
SiO 2 / Al 2 O 3 = 9.8
(Na, K) 2 O / Al 2 O 3 = 0.99
K / (K + Na) = 0.90
As a result of X-ray diffraction, there was no peak other than clinoptilolite, and the crystal content of clinoptilolite was 100%.
０．０１ｍｏｌ／ＬのＢａＣｌ２、ＮａＣｌ無添加の１０００ｍＬイオン交換水溶液を調製し、得られたクリノプチロライト粉体３７ｇに加え、６０℃で２時間攪拌する操作を２回行ってイオン交換を行い、１Ｌの湯洗後、浄ろ過ケーキを１１０℃で１２時間以上乾燥してバリウム交換クリノプチロライトを得た。 Prepare a 1000 mL ion exchange aqueous solution without addition of 0.01 mol / L BaCl 2 and NaCl, add it to 37 g of the resulting clinoptilolite powder, and stir at 60 ° C. for 2 hours twice for ion exchange. After washing with 1 L of hot water, the purified filter cake was dried at 110 ° C. for 12 hours or more to obtain barium-exchanged clinoptilolite.
得られたクリノプチロライト中のＢａ、Ｃａ、Ｍｇ、Ｎａ、Ｋ量の割合および２５℃でのメタン吸着量を表１に示す。 Table 1 shows the proportions of Ba, Ca, Mg, Na, and K in the obtained clinoptilolite and the amount of methane adsorbed at 25 ° C.
実施例２
０．０１ｍｏｌ／ＬのＢａＣｌ２、０．１４ｍｏｌ／ＬのＮａＣｌの１０００ｍＬイオン交換水溶液を調製し、実施例１で得られたクリノプチロライト粉体３７ｇに加え、６０℃で２時間攪拌する操作を２回行ってイオン交換を行い、１Ｌの湯洗後、浄ろ過ケーキを１１０℃で１２時間以上乾燥してバリウム交換クリノプチロライトを得た。
Example 2
An operation of preparing a 1000 mL ion exchange aqueous solution of 0.01 mol / L BaCl 2 and 0.14 mol / L NaCl, adding to 37 g of the clinoptilolite powder obtained in Example 1, and stirring at 60 ° C. for 2 hours Was performed twice, and ion exchange was performed. After washing with 1 L of hot water, the purified filter cake was dried at 110 ° C. for 12 hours or more to obtain barium-exchanged clinoptilolite.
得られたクリノプチロライト中のＢａ、Ｃａ、Ｍｇ、Ｎａ、Ｋ量の割合および２５℃でのメタン吸着量を表１に示す。 Table 1 shows the proportions of Ba, Ca, Mg, Na, and K in the obtained clinoptilolite and the amount of methane adsorbed at 25 ° C.
実施例３
０．１ｍｏｌ／ＬのＢａＣｌ２、０．１４ｍｏｌ／ＬのＮａＣｌを含む１０００ｍＬイオン交換水溶液を調製し、実施例１で得られたクリノプチロライト粉体３７ｇに加え、６０℃で２時間攪拌する操作を２回行ってイオン交換を行い、１Ｌの湯洗後、浄ろ過ケーキを１１０℃で１２時間以上乾燥してバリウム交換クリノプチロライトを得た。
Example 3
A 1000 mL ion exchange aqueous solution containing 0.1 mol / L BaCl 2 and 0.14 mol / L NaCl is prepared, added to 37 g of the clinoptilolite powder obtained in Example 1, and stirred at 60 ° C. for 2 hours. The operation was performed twice to perform ion exchange, and after washing with 1 L of hot water, the purified filter cake was dried at 110 ° C. for 12 hours or more to obtain barium-exchanged clinoptilolite.
得られたクリノプチロライト中のＢａ、Ｃａ、Ｍｇ、Ｎａ、Ｋ量の割合および２５℃でのメタン吸着量を表１に示す。 Table 1 shows the proportions of Ba, Ca, Mg, Na, and K in the obtained clinoptilolite and the amount of methane adsorbed at 25 ° C.
実施例４
１．４６ｍｏｌ／ＬのＢａＣｌ２、ＮａＣｌ無添加の１０００ｍＬイオン交換水溶液を調製し、実施例１で得られたクリノプチロライト粉体３７ｇに加え、６０℃で２時間攪拌する操作を２回行ってイオン交換を行い、１Ｌの湯洗後、浄ろ過ケーキを１１０℃で１２時間以上乾燥してバリウム交換クリノプチロライトを得た。
Example 4
A 1.46 mol / L BaCl 2 and NaCl-free 1000 mL ion exchange aqueous solution was prepared, added to 37 g of the clinoptilolite powder obtained in Example 1, and stirred at 60 ° C. for 2 hours twice. Ion exchange was performed, and after washing with 1 L of hot water, the purified filter cake was dried at 110 ° C. for 12 hours or more to obtain barium exchange clinoptilolite.
得られたクリノプチロライト中のＢａ、Ｃａ、Ｍｇ、Ｎａ、Ｋ量の割合および２５℃でのメタン吸着量を表１に示す。 Table 1 shows the proportions of Ba, Ca, Mg, Na, and K in the obtained clinoptilolite and the amount of methane adsorbed at 25 ° C.
実施例５
０．０１ｍｏｌ／ＬのＢａＣｌ２を含む１０００ｍＬイオン交換水溶液を調製し、フェリエライト（ＨＳＺ−７２０ＫＯＡ、ＳｉＯ２／Ａｌ２Ｏ３＝１８．０、東ソー品）粉体３７ｇに加え、８０℃で２時間攪拌する操作を１回行ってイオン交換を行い、１１０℃で１２時間以上乾燥してバリウム交換フェリエライトを得た。
Example 5
A 1000 mL ion exchange aqueous solution containing 0.01 mol / L BaCl 2 was prepared, added to 37 g of ferrierite (HSZ-720KOA, SiO 2 / Al 2 O 3 = 18.0, Tosoh product) powder, and 2 at 80 ° C. The operation of stirring for a time was performed once to perform ion exchange, and dried at 110 ° C. for 12 hours or more to obtain barium exchange ferrierite.
得られたフェリエライト中のＢａ、Ｃａ、Ｍｇ、Ｎａ、Ｋ量の割合および２５℃でのメタン吸着量を表１に示す。 Table 1 shows the proportions of Ba, Ca, Mg, Na, and K in the obtained ferrierite and the amount of methane adsorbed at 25 ° C.
実施例６
０．１ｍｏｌ／ＬのＢａＣｌ２を含む１０００ｍＬイオン交換水溶液を調製し、フェリエライト（ＨＳＺ−７２０ＫＯＡ、ＳｉＯ２／Ａｌ２Ｏ３＝１８．０、東ソー品）粉体３７ｇに加え、８０℃で２時間攪拌する操作を１回行ってイオン交換を行い、１１０℃で１２時間以上乾燥してバリウム交換フェリエライトを得た。
Example 6
A 1000 mL ion exchange aqueous solution containing 0.1 mol / L BaCl 2 was prepared and added to 37 g of ferrierite (HSZ-720KOA, SiO 2 / Al 2 O 3 = 18.0, Tosoh product) powder, and 2 at 80 ° C. The operation of stirring for a time was performed once to perform ion exchange, and dried at 110 ° C. for 12 hours or more to obtain barium exchange ferrierite.
得られたフェリエライト中のＢａ、Ｃａ、Ｍｇ、Ｎａ、Ｋ量の割合および２５℃でのメタン吸着量を表１に示す。 Table 1 shows the proportions of Ba, Ca, Mg, Na, and K in the obtained ferrierite and the amount of methane adsorbed at 25 ° C.
実施例７
１ｍｏｌ／ＬのＢａＣｌ２を含む１０００ｍＬイオン交換水溶液を調製し、フェリエライト（ＨＳＺ−７２０ＫＯＡ、ＳｉＯ２／Ａｌ２Ｏ３＝１８．０、東ソー品）粉体３７ｇに加え、８０℃で２時間攪拌する操作を２回行ってイオン交換を行い、１１０℃で１２時間以上乾燥してバリウム交換フェリエライトを得た。
Example 7
A 1000 mL ion exchange aqueous solution containing 1 mol / L BaCl 2 was prepared, added to 37 g of ferrierite (HSZ-720KOA, SiO 2 / Al 2 O 3 = 18.0, Tosoh product) powder, and stirred at 80 ° C. for 2 hours. The ion exchange was carried out twice, and the barium exchange ferrierite was obtained by drying at 110 ° C. for 12 hours or more.
得られたフェリエライト中のＢａ、Ｃａ、Ｍｇ、Ｎａ、Ｋ量の割合および２５℃でのメタン吸着量を表１に示す。 Table 1 shows the proportions of Ba, Ca, Mg, Na, and K in the obtained ferrierite and the amount of methane adsorbed at 25 ° C.
比較例１
０．００１ｍｏｌ／ＬのＢａＣｌ２、０．１ｍｏｌ／ＬのＮａＣｌを含む１０００ｍＬイオン交換水溶液を調製し、実施例１で得られたクリノプチロライト粉体３７ｇに加え、６０℃で２時間攪拌する操作を１回行ってイオン交換を行い、１Ｌの湯洗後、浄ろ過ケーキを１１０℃で１２時間以上乾燥してバリウム交換クリノプチロライトを得た。
Comparative Example 1
A 1000 mL ion exchange aqueous solution containing 0.001 mol / L BaCl 2 and 0.1 mol / L NaCl is prepared, added to 37 g of the clinoptilolite powder obtained in Example 1, and stirred at 60 ° C. for 2 hours. The operation was performed once to perform ion exchange, and after washing with 1 L of hot water, the purified filter cake was dried at 110 ° C. for 12 hours or more to obtain barium-exchanged clinoptilolite.
得られたクリノプチロライト中のＢａ、Ｃａ、Ｍｇ、Ｎａ、Ｋ量の割合および２５℃でのメタン吸着量を表１に示す。 Table 1 shows the proportions of Ba, Ca, Mg, Na, and K in the obtained clinoptilolite and the amount of methane adsorbed at 25 ° C.
比較例２
０．０１ｍｏｌ／ＬのＢａＣｌ２、０．３５ｍｏｌ／ＬのＮａＣｌを含む１０００ｍＬイオン交換水溶液を調製し、フェリエライト（ＨＳＺ−７２０ＫＯＡ、ＳｉＯ２／Ａｌ２Ｏ３＝１８．０、東ソー品）粉体３７ｇに加え、８０℃で２時間攪拌する操作を１回行ってイオン交換を行い、１１０℃で１２時間以上乾燥してバリウム交換フェリエライトを得た。
Comparative Example 2
A 1000 mL ion exchange aqueous solution containing 0.01 mol / L BaCl 2 and 0.35 mol / L NaCl was prepared, and ferrierite (HSZ-720KOA, SiO 2 / Al 2 O 3 = 18.0, Tosoh product) powder In addition to 37 g, an operation of stirring at 80 ° C. for 2 hours was performed once to perform ion exchange, and dried at 110 ° C. for 12 hours or more to obtain barium exchange ferrierite.
得られたフェリエライト中のＢａ、Ｃａ、Ｍｇ、Ｎａ、Ｋ量の割合および２５℃でのメタン吸着量を表１に示す。 Table 1 shows the proportions of Ba, Ca, Mg, Na, and K in the obtained ferrierite and the amount of methane adsorbed at 25 ° C.
比較例３
フェリエライト（ＨＳＺ−７２０ＫＯＡ、ＳｉＯ２／Ａｌ２Ｏ３＝１８．０、東ソー品）粉体３７ｇをＨ型に処理したＨ型フェリエライトを得た。
Comparative Example 3
Ferrite light (HSZ-720KOA, SiO 2 / Al 2 O 3 = 18.0, Tosoh product) powder 37 g of H-type ferrierite treated with H-type was obtained.
得られたフェリエライト中のＢａ、Ｃａ、Ｍｇ、Ｎａ、Ｋ量の割合および２５℃でのメタン吸着量を表１に示す。 Table 1 shows the proportions of Ba, Ca, Mg, Na, and K in the obtained ferrierite and the amount of methane adsorbed at 25 ° C.
比較例４
０．１ｍｏｌ／ＬのＢａＣｌ２を含む１０００ｍＬイオン交換水溶液を調製し、Ｘ型ゼオライト（ＳｉＯ２／Ａｌ２Ｏ３＝２．３、東ソー品）粉体２０ｇに加え、８０℃で２時間攪拌する操作を１回行ってイオン交換を行い、１１０℃で１２時間以上乾燥してバリウム交換Ｘ型ゼオライトを得た。
Comparative Example 4
A 1000 mL ion exchange aqueous solution containing 0.1 mol / L BaCl 2 is prepared, added to 20 g of X-type zeolite (SiO 2 / Al 2 O 3 = 2.3, Tosoh product) powder, and stirred at 80 ° C. for 2 hours. The operation was performed once to perform ion exchange, and the barium exchange X-type zeolite was obtained by drying at 110 ° C. for 12 hours or more.
得られたＸ型ゼオライト中のＢａ、Ｃａ、Ｍｇ、Ｎａ、Ｋ量の割合および２５℃でのメタン吸着量を表１に示す。 Table 1 shows the proportions of Ba, Ca, Mg, Na, and K in the obtained X-type zeolite and the amount of methane adsorbed at 25 ° C.
実施例１〜７により、バリウムイオン交換率が５ｍｏｌ％以上９５ｍｏｌ％以下であるクリノプチロライト型またはフェリエライト型の構造を有するゼオライトは、メタン吸着能に優れていることが確認できた。 From Examples 1 to 7, it was confirmed that the zeolite having a clinoptilolite type or ferrierite type structure having a barium ion exchange rate of 5 mol% or more and 95 mol% or less was excellent in methane adsorption ability.
本発明の炭化水素吸着剤は、メタン等を微量に含有するガスからメタン等を吸着分離するＰＳＡ法、ＴＳＡ法、ＰＴＳＡ法などの吸着分離プロセスに適用することができる。 The hydrocarbon adsorbent of the present invention can be applied to adsorption separation processes such as a PSA method, a TSA method, and a PTSA method that adsorb and separate methane from a gas containing a small amount of methane.
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