TW590798B - Catalytic reactor and process - Google Patents
Catalytic reactor and process Download PDFInfo
- Publication number
- TW590798B TW590798B TW091135176A TW91135176A TW590798B TW 590798 B TW590798 B TW 590798B TW 091135176 A TW091135176 A TW 091135176A TW 91135176 A TW91135176 A TW 91135176A TW 590798 B TW590798 B TW 590798B
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- steam
- methane
- hydrogen
- channel
- reactor
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- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/24—Stationary reactors without moving elements inside
- B01J19/248—Reactors comprising multiple separated flow channels
- B01J19/249—Plate-type reactors
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J12/00—Chemical processes in general for reacting gaseous media with gaseous media; Apparatus specially adapted therefor
- B01J12/007—Chemical processes in general for reacting gaseous media with gaseous media; Apparatus specially adapted therefor in the presence of catalytically active bodies, e.g. porous plates
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- B01J19/2495—Net-type reactors
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- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
- C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
- C01B3/38—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using catalysts
- C01B3/384—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using catalysts the catalyst being continuously externally heated
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- Y02P20/50—Improvements relating to the production of bulk chemicals
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
- Inorganic Chemistry (AREA)
- Hydrogen, Water And Hydrids (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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590798 捌、發明說明 [發明所屬之技術領域] 本發明關於一種催化方法,及關於一種含有適用於 進行該方法的催化反應器之設備。 [先前技術] W〇01/51194(Accentusplc)中敘述一種方法,其中在 第一催化反應器中甲烷與蒸汽反應而產生一氧化碳和 氫;然後在第二催化反應器中將所得到的氣體混合物用 於進行費雪-闕布希合成。總結果爲將甲烷轉化成較高 分子量的烴類,其在周圍條件下一般爲液體。此方法的 兩階段,即蒸汽/甲烷重組和費雪-闕布希合成,係需要 不同的觸媒,而且陳述各階段用的催化反應器。當反應 器分別爲吸熱和放熱時,催化反應器能傳遞熱量給反應 氣體或來自反應氣體;甲烷的燃燒提供蒸汽/甲烷重組所 需的熱量此方法的潛在問題爲蒸汽/甲烷重組反應器中 可能發生其它反應,產生二氧化碳或產生焦炭。有建議 重組器可倂有鈀/鍺觸媒,反應在8 00 °C進行。所建議的 方法依賴於蒸汽/甲烷比,其接近1 : 1,因爲铑觸媒明顯 地抗焦化。已經發現一種進行此方法的改良方式。 [發明內容] 本發明提供一種用於進行蒸汽/甲烷重組以產生一氧 化碳和氫之方法,其中使氣體混合物流經金屬片之間的 窄流體通道,該金屬片隔開流體通道與熱源,該流體通 道含有流體可透過性觸媒結構,通道內的滯留時間係少 590798 於0.5秒,而且沿著通道的平均溫度及通道出口溫度皆 在75(TC至9 00。(:的範圍內,其中蒸汽係至少部分藉由 冷凝來自可燃燒性氣體(較佳含有甲烷)的燃燒之水蒸氣 而供應。 本發明亦提供一種用於進行蒸汽/甲烷重組的設備, 其特別適用於採油設備、浮動平台或船。在該環境下, 空間係有限的,且設備的重量必須最小化。 較且地’滞留時間係少於〇 · 1秒,但是較佳爲至少 0 · 0 2秒。推測如此短的時間係能讓製程在不平衡條件下 操作,俾僅使有具比較快動力學的反應能發生。亦較宜 地,蒸汽對甲烷的比例爲在1.2至2.0的範圍內,更佳 1.3至1.6,最佳約1.4或1.5。在這些條件下,進行反 應的甲烷之比例可超過9 0 %。再者,形成一氧化碳而非 二氧化碳的選擇率可超過85%,且甚至90%。 催化反應器較佳爲包括數個排列用於界定第一和第 二流體通道的金屬片,通道係交替排列著以確保在它們 之間流體有良好的熱接觸。視所需要的反應而定,在各 通道中應提供適合的觸媒。爲了確保所需要的良好熱接 觸’第一和第一流體通道在與片成垂直的方向較佳爲皆 少於5毫米深。第一和第二流體通道更佳爲皆少於3毫 米深。波形箔或具有凹坑的箔、金屬網或波形或皺摺的 金屬氈片可在流體通道內用當作觸媒結構的基材,以增 加熱的傳遞。因爲蒸汽/甲烷重組方法需要良好的熱接觸 以達成高的CO選擇率,故較佳的結構爲包括一種具有 薄塗層(其含觸媒材料)的金屬箱。 590798 如W〇ο 1 / 5 1 1 9 4中所述,該反應器可用於進行甲烷/ 蒸汽重組,交替的通道含有甲院/空氣混合物,故放熱氧 化反應提供吸熱重組反應所需要的熱量。氧化反應可以 使用數種不同的觸媒,例如陶瓷載體上的鈀、鉑或銅; 例如經鑭、铈或鋇所安定的氧化鋁載體上之銅或鉑,或 氧化锆上之鈀,或金屬六鋁酸鹽如鎂、鈣、緦、鋇或鉀 的六鋁酸鹽上之鈀,或較佳爲γ-氧化鋁上的鈀或鉑,具 有約1 0重量%的金屬負載(相對於氧化鋁)。此觸媒燃燒 較佳係在通道中表面上厚度20至200μπι的塗層中,較 佳爲在箔上。重組反應亦可以使用數種不同的觸媒,例 如鎳、鉑、鈀、釕或鍺,其可用在陶瓷塗層上;重組反 應的較佳觸媒係具有鍺當作促進劑的鉑,其在氧化鋁或 經安定的氧化鋁上。而且,與氧化鋁比較下,觸媒金屬 較佳爲約10重量%,且係被提供當作1 0-200μιη塗層, 較佳10至50μιη。氧化反應可實質上在大氣壓力下進 行,然而反應也可在高壓進行,例如在高達2MPa (20大 氣壓)的壓力,但在大氣壓力下操作係較宜的,或可以 在稍微高的壓力,例如在大氣壓力以上的0至200kPa 的範圍內。 將了解的是,反應器的材料在使用時係遭受嚴重的 腐蝕環境,例如溫度可能與9 0 〇 °C同樣高,但是更典型 爲約8 0 0 °C或8 5 0 °C。反應器可爲金屬製,如帶有鋁的 鈀粒鐵鋼,尤其已知稱爲費克拉洛尹(Fecralloy)(商標) 的類型,其爲鐵與高達20%鉻、〇.5-丨2%鋁及0.丨_3%釔。 例如其可包括鐵與1 5 %鉻、4 %鋁及〇 . 3 %釔。當在空氣中 590798 加熱此金屬時,其形成氧化鋁的黏附氧化物塗層以保護 合金防止更進一步的氧化;此氧化物層亦保護合金在例 如甲烷氧化反應器或蒸汽/甲烷重組反應器的條件下避 免被腐鈾。當將此金屬用作觸媒基材且經一種內混有觸 媒材料的陶瓷層所被覆時,茲相信金屬上的氧化鋁層係 與氧化物塗層結合,以確保催化材料黏附於金屬基材。 爲了某些目的,可改將觸媒金屬直接沈積在金屬的 黏附氧化物塗層上(沒有任何陶瓷層)。 上述蒸汽/甲烷重組方法所製造的氣體較佳爲接著經 歷費雪-闕布希合成。此可使用具有不同觸媒的第二反 應器來進行。在費雪-闕布希合成後,當過量的氫殘留 時,較佳爲由所欲的產品中分離出氫,及將其送回蒸汽 /甲烷重組反應器的燃燒流體通道。已經發現在這些通道 內,甲烷與氫和空氣的混合物之燃燒係能產生更均勻的 溫度,而且當反應器爲冷時亦能較容易地引發燃燒反 應。 [實施方式] 現將參考圖式藉由實施例來更進一步且更詳細地說 明本發明。 本發明關於一種用於將甲烷轉化成較長鏈的烴類之 化學方法。第一階段涉及蒸汽/甲烷重組,即以下反應: H20 + CH4 C〇 + 3H2 此反應係吸熱的,且可在第一氣流通道中被鍺或鉑/ 铑混合物所催化。此反應所需要的熱量由甲烷的燃燒所 提供,即: -10- 590798 CH4 + 2〇2 — C〇2 + 2H2〇 其係一種放熱反應,且可在相鄰的第二氣流通道中被鉑 /鈀觸媒所催化。這些反應皆可發生在大氣壓力,但是重 組反應也可能發生在高壓。燃燒反應所產生的熱將被導 引經過用於分隔相鄰通道的金屬片。 蒸汽/甲烷重組所產生的氣體混合物於是可用於進行 費雪-闕布希合成,以產生較長鏈的烴,即 n C 〇 + 2 η Η 2 — (C Η 2) η + η Η 2 〇 其係一種放熱反應,發生在高溫,典型上介於200和350 °C之間,例如23 0 °C,及在高壓,典型上介於2MPa和 4MPa之間,例如2.5 MPa,於觸媒如鐵、鈷或熔融磁鐵 礦,具有促進劑如鉀。反應所形成的有機化合物之特性 係取決於溫度、壓力、觸媒以及一氧化碳對氫的比例。 較佳的觸媒係比表面積1 40 - 2 3 0m2/g且具有約35重量% 鈷的γ-氧化鋁(當作塗層),且具有釕、鉑、釓或鍊促進 劑,並具有鹼性促進劑如Th02。此合成反應所放出的熱 係用來提供蒸汽/甲烷重組反應所需要的熱之至少一部 分,例如可用傳熱流體傳遞來自發生費雪-闕布希合成 的反應器之熱,亦確保費雪-闕布希反應器的溫度依然 穩定,該熱用於預熱供應至重組反應器的至少一個氣 流。 若可在海上進行,例如在浮動的製造平台或採油設 備上進行,則該些反應係特別有利的,因爲它們能開採 濱海氣體資源。濱海氣體或相關的氣體儲藏量代表未經 開採的燃料源,但是由於其位置常常是遙遠的,故不能 590798 容易地開採,且氣流可能不夠大,而沒有理由來建造管 線或設備以製造液化天然氣。目前,該氣體通常被火化 或再注入。在陸地上用於藉由蒸汽/甲烷重組及接著費雪 -闕布希合成來製造液態烴的設備係已知的,但是用於 此目的之傳統設備係非常大的,而不能方便地安裝在浮 動結構的平台上,而且的確某些所採用的程序會受到波 浪引起的移動所影響。然而,藉由使用小型催化反應 器,如PCT/GB2002/004 1 44中所述者,來進行該反應, 其之體積典型上係爲相同任務之傳統反應器的十分之 一,則可以在採用裝備或浮動結構上進行該程序。 由以上所給的方程式將了解的是,必須提供蒸汽來 進行蒸汽/甲烷重組反應,而且爲了真正確保觸媒不會被 焦炭所被覆’必須提供比甲烷更多莫耳數的蒸汽。理想 上’在費雪-闕布希合成後,所有供用於進行蒸汽/甲烷 重組的水應被回收,但是實際上因此各階段的效率不足 而需要額外的水。爲了在海上的採油設備或浮動結構上 作業’原則上可由經海水所供應的蒸餾設備來提供該 水,但是海水的煮沸會產生鹽,而易於造成腐蝕問題; 若蒸汽可由化學程序設備本身所提供則係較宜的。 現參閱第1圖,以流程圖來顯示設備及全部化學程 序。進料氣4主要由甲烷和小百分率(例如10%)的乙烷 和丙烷所構成。其亦可能含有會損害觸媒的硫化合物。 其首先通經一流體漩渦式滌氣器5,其中它徑向向內與 脫硫液之液滴成逆向流動。此例如可包括一種經蟹合的 鐵鹽之水丨谷液’其與亞硫化合物反應而被還原成亞鐵形 590798 式。液體被泵6循環經過流體漩渦式滌氣器7,其中它 與空氣接觸而再產生鐵鹽及形成硫的沈澱物,然後通經 過濾器8和泵9而回到滌氣器5。進料氣4因此係被脫 硫的。漩渦式滌氣器5和7不會受波浪引起的移動來所 影響。 另外,經硫所污染的天然氣可在200 _ 5 00 °C的溫度於 氫-脫硫觸媒上與氫反應,而將硫醇轉化成H2S。氣體然 後通經吸附劑床(如Zn〇,俾H2S反應而產生H20及 ZnS)。某些吸附劑可在現場再生,產生S〇2。 經脫離的進料氣1 0係通經熱交換器1 1,,俾其之溫 度約4 0 0 °C,然後經由流體漩渦式混合器1 2供應第一催 化反應器1 4 ;在混合器1 2中,進料氣係與亦約4 0 0 °C的 蒸汽束流作混合,該束流經由切線入口進入混合器1 2, 及沿著螺旋路徑至軸出口,俾它們變成徹底混合。二束 流可在大氣壓力,或例如在大氣壓力以上的l〇〇kPa。流 動方式較佳爲使得蒸汽:甲烷莫耳比(在蒸汽/甲烷重組 階段)介於1 · 4和1 · 6之間,較佳1 . 5。反應器1 4的第一 部分係在400 °C具有鎳甲烷化作用觸媒的預重組器15, 其中高級烷類與蒸汽反應以形成甲烷(及一氧化碳);需 要額外的蒸汽以確保在此預重組階段後(若進料氣4實 質上不含有高級烷類時則此預重組器1 5係不需要的)達 成所欲的蒸汽/甲烷比例。預重組器用的一種替代性觸媒 係鉑/鍺。反應器1 4的第二部分係具有鉑/铑觸媒的重組 器16,其中甲烷與蒸汽反應以形成一氧化碳和氫。如下 述,此反應可在8 5 0 °C進行。 590798 可由在反應器14之相鄰氣流通道內的鈀或鉑上的甲 _ 烷之燃燒來提供吸熱反應所需要的熱。觸媒可倂有金屬 · 六鋁酸鹽(如六鋁酸鎂),且較佳爲^氧化鋁’及5 - 2 0重 · 量% (例如10重量%)的鉑/铑觸媒。在階段中’可沿著通 道1 7的長度來供應甲氧氧氣混合物給該通道1 7以確保 燃燒係發生在遍及於其長度。來自燃燒通道1 7的廢氣 · 係通過一經海水冷卻的熱交換器19以導致至少部水蒸 - 氣發生凝結,而其餘的氣體則當作廢氣釋放至大氣中’ 同時將液態水送經導管24(見以下)。 修 由重組器1 6所出來的一氧化碳和氫之熱混合物然後 通經熱交換器1 8以被驟冷’俾提供熱蒸汽給漩渦式混 合器12,然後經過熱交換器11,其中它失去熱量而送 給進料氣。然後藉由通過一被水冷卻的熱交換器20而 將混合物更進一步冷卻至約1 〇 〇 °C。任何凝結的水蒸氣 係與氣流分離而進入導管25內。氣體然後被壓縮機22 „ 壓縮至1.0-2.5MPa(10-25atm)的壓力範圍內。 高壓的一氧化碳和氫之束流然後被送至催化反應器 $ 26,於其中氣體發生反應,進行費雪-闕布希合成,而形 成烷屬烴或類似化合物。此反應係放熱的,較佳爲發生 於約2 3 0 °C ,且所產生的熱可用預熱要供應至熱交換器 18的蒸汽,該熱交換器使用一種循環於反應器26與蒸 — 汽發生器28的熱交換通道之間的熱交換流體,如氦氣。 在此合成期間,氣體的體積減少。然後將所產生的氣體 通入冷凝器3 0,於其內與最初在2 5 °C的水作熱交換。 高級烷類(例如C5以上)凝結成液體,如同水,此混合物 -14- 590798 通往重力分離器3 1 ;所分離出的高級烷類於是可當作所 要的產物被移出。 | . 來自分離器3 1的水係經由熱交換器2 8和1 8回到混 . σ器1 2 °來自導管2 4和2 5的水亦與此水流合倂。分離 器31中的水亦含有醇類(其可在費雪-闕布希反應器26 中被形成)’俾水可首先經蒸汽所汽提以便在回到混合 · 益1 2之目丨j去除可溶性有機化合物。若含有水的醇類回 _ 到混合器1 2,則該醇類將被重組而產生c〇、c 0 2及Η 2。 任何低級烷類或甲烷以及殘存的氫係通經冷凝器3 〇 φ 及送往冷凍式冷凝器3 2,於其中被冷卻至約5 °C。殘存 的氣體主要係由氫、二氧化碳、甲烷和乙烷所構成,其 通經減壓渦輪33及經由導管34被送入儲槽35內,然 後經由閥3 6進入第一催化反應器1 4的燃燒通道。被冷 凝的蒸氣主要係由丙烷、丁烷和水所構成,其通往重力 分離器37,來自其的水與來自分離器31的循環水結合, _ 而院類被循環至進料管10,俾送入預重組器15內。如 虛線所示’渦輪3 3所發出的電力可用於幫助壓縮機2 2 | 的驅動。 當使用此形式時,程序的總結果爲將甲烷轉化成較 高分子量的烴類,其在周圍溫度典型上係液體。該程序 可用在油或氣體,良好地將甲烷氣轉化成液態烴,其係 ^ 較易於運輸。 根據以上所給的蒸汽/甲烷重組反應,吾人預期蒸汽 對甲烷的適當莫耳比應爲1 : 1。然而,在該比値時有焦 化的重大危險,且有大比例的甲烷將不會進行反應之危 -15· 590798 險。增加蒸汽的比例會增加甲烷反應的比例,及減少焦 化的危險,但是若蒸汽的比例太高則會同樣地增加二氧 化碳的形成。過量的蒸汽係能量的浪費,而且會稀釋反 應物氣體。已發現,在1 . 3至1 · 6間的蒸汽/甲烷比操作 時,較佳爲在1.4或1.5的蒸汽/甲烷比’結合短的滯留 時間,較佳爲l〇〇ms,則能對一氧化碳的形成有高選擇 率,而且有非常高比例的甲烷進行反應。經過重組器1 6 的流速較佳爲使得滯留時間在2 0至1 〇 〇 m s的範圍內, 更佳約5 0 m s。沿著重組器1 6中各通道的平均溫度係在 7 5 0 °C以上,較佳介於8 0 0 °C和9 0 0 °C之間。 該短的滯留時間使得反應器1 6能在非平衡的條件下 操作。一氧化碳與蒸汽之間的競爭反應(會形成不想要 產物二氧化碳和氫)之動力學係慢於形成一氧化碳和氫 的蒸汽/甲烷重組反應;且在重組反應中’逆向程序之動 力學係慢於順向程序。短的滯留時間使得較慢的反應沒 有足夠的時間抵達平衡。在這些條件下’甲烷進行反應 的比率可能超過90%,而且對一氧化碳的選擇率可超過 90%。 已經作過實驗測量,爲使一經預熱的蒸汽/甲烷混合 物(比例爲1 . 5 )通過類似於下述參照第2圖的多通道反 應器,滯留時間爲50ms。由靠近通道入口處和靠近通道 出口處以及其它中間位置處所測得的溫度能計算出平 询。所獲得的結果如表中所示: 人口溫度/°c 出口溫度广C 平均溫度/°c CO選擇率/% ch4轉化率/% 726 ____^ 853 810 92.5 93.8 731 866 815 93.0 94.2 590798 以高於8 0 0 °C的出口溫度,更佳高於8 5 0 °C的出口溫 度,來操作以增加C〇製造的選擇率。於氫的存在下將 反應器的溫度加熱至約8 5 (TC以進行預處理亦可改善反 應器的性能,因爲其改善後續的觸媒活性。 如上述,進料至費雪-闕布托合成反應器的理想之氫/ 一氧化碳化學計量比例係約2莫耳的氫對1莫耳的一氧 化碳。如上討論的,藉由蒸汽/重組反應係不能容易獲得 此比例,在蒸汽/甲烷比爲1 . 0時,所得到的氣體混合物 具有3:1之氫對一氧化碳比,而在必須採用高蒸汽/甲烷 比以避免焦化時,氫對一氧化碳比係約3,且可能高達4 比1。因此,在費雪-闕布托合成反應已經發生後,將有 過量的氫殘存著。己經發現,將此氣體送入反應器 14 的燃燒通道會產生更均勻的溫度分佈,而使得在反應器 冷時能更容易地引發燃燒反應(因此催化燃燒可在與15 或 20°C同樣低的溫度發生)。製程的總熱效率係被改善 了,直接送入燃燒通道的甲烷量係減少了,而且一氧化 碳排放至環境的量亦減少了。 現參閱第2圖,反應器40 (適合於蒸汽/甲烷重組如反 應器1 4的例子)包括一堆費克拉洛尹鋼板4 1,各板大體 上爲矩形,450mm長、150mm寬及3mm厚,這些尺寸係 僅爲例子而已。在各板41之上表面上有被陸面43所分 隔的深度2mm之矩形溝槽42(圖中顯示八條該溝槽),但 是有三種不同安排的溝槽4 2。在圖中所示的板4 1中, 溝槽4 2以與板4 1之縱軸成4 5 °的角度斜向地延,由左 590798 上係右下。在第二類型的板41中,溝槽42a(如虛線所 示)循著鏡向樣式,成45。地延伸,由左下至右上。在第 三類型的板41中,溝槽42b (如鏈線所示)係與縱軸成平 行地延伸。 板 4 1係組裝成一種堆疊體,其各屬於第三類型板 4 1 (具有縱向溝槽4 2 b )介於具有斜溝槽4 2的板及一與斜 溝槽4 2 a成鏡像的板,而在組裝許多板41後,以一空 白的矩形板來完成堆疊體。板4 1係被壓縮在一起或經 擴散接合,俾它們互相密封。一經含觸媒材料的厚1 5 μιη 陶瓷塗層所被覆的且具有適當形狀和高mm波紋的波形 費克拉洛尹合金范44(僅顯不一個)係可滑入各溝槽 4 2、4 2 a和4 2 b內。在各案例中,波紋的延伸係與流向 成平行。 頭部室4 6係沿著側邊焊接於堆疊體,各頭部4 6藉由 兩個亦焊接至堆疊體的鰭片47而界定三個室。鰭片47 係爲沿著各端之堆疊體的長度的途徑之三分之一,且在 具有斜溝槽4 2或4 2 a的各板4 1中係與陸面4 3 —致(或 一部分的板沒有溝槽)。然後在各端將矩帽狀的頭部焊 接於堆疊體,與縱向溝槽4 1 b連通。在一修飾例(未於圖 示),可用三個相鄰的頭部室,各爲橡矩帽的頭部4 8, 來代替各三室頭部4 6。 在使用反應器4 0於蒸汽/甲烷重組時,蒸汽/甲烷混 合物係供應給頭部4 8的一端(如所示,在右側),而所得 到的氫和一氧化碳之混合物係由頭部48的另一端流 出。甲烷/空氣混合物係供應給兩個頭部4 6另一端(如所 590798 示,在左側端)的室,且來自燃燒程序的廢氣係流經兩 個頭部右側端的室,供應給左上方頭部室(如所示)的混 合物之流動路徑係經過斜溝槽4 2進入底部中間的頭部 室,然後流經過在堆疊體中其它板中的斜溝槽42a進入 右上方頭部室內。因此氣流係至少部分逆流的,俾最靠 近通道之入口的燃燒通道中的最熱區域係最接近蒸汽/ 甲烷重組反應的出口。 頭部46和48各包括簡單的矩形帽,其周緣密封於堆 疊體外側,俾蓋住堆疊體一面的部分。它們可焊接到堆 疊體的外側。另外,若氣流皆不在高壓,則可適當地將 頭部室46、48夾在堆疊體外側上。在任一情況中,將 了解的是,在使用一段時間後,若通道兩者或之一中的 觸媒已經被耗盡,則可移除或分離頭部4 6和4 8,及移 除並替換對應的帶有觸媒之箔 44。然後,再裝上頭部 46 、 48 ° 將了解的是,氣流通道中的波形箔44上的陶瓷之類 型和厚度可能不同於堆疊體中的連續板41,而且觸媒材 料亦可能不同。例如,陶瓷可能包括在氣流通道之一中 的氧化鋁及在其它氣流通道中的氧化锆。板4 1所形成 的反應器40亦可適用於進行費雪-闕布希合成。因爲形 成堆疊體的板4 1係接合在一起,故氣流通道係氣密的 (除了與頭部4 6或4 8連通外),且板4 1和溝槽4 2的尺 寸係爲使得交替的氣流通道內之壓力可能相當不同。再 者,波形箔44的間距或樣式可沿著反應器通道42而變 化,以便調整催化活性,因此在反應器40的不同點提 590798 供對溫度或反應速率的控制。波形箔44亦 孔者,以便促進通道42內流體的混合。再= 部分可沒有觸媒。 將了解的是,用於形成堆疊體的板可爲 (典型在在400-1200mm長、150-600mm寬的 斜溝槽42和42a可具有不同的方向(典型J: 90°之間),例如板可爲8 0 0 mmx400mm,且溝 軸成約56° (若沿著各側有三個頭部室)或約 個頭部室)。在一案例中,頭部確保該組通 爲循著沿反應器的蛇狀路徑。 在反應器40的一修飾例中,箔44係再度 尹材料製,但是觸媒材料係直接沈積在費克 化物層上。 特別地,當反應器4 0將用於費雪-闕布希 應器的氣流通道42可減少寬度,及可能的 其長度之深度,俾改變流體流動條件,及熱 數。在合成反應期間,氣體體積減少,且藉 通道42逐漸變細,則在反應進行時可維持 再者,波形箔44的間距或樣式可沿著反應ί 化,俾調整催化活性,而因此在反應器40 供對溫度或反應速率的控制。 當反應器如反應器40係用於氣體之間的 氣態產物時,則通道的方向係不重要的。然 爲液體,則較佳安排反應器40以使得反應 係向下傾斜,以確保所形成的任何液體將由 可爲具有穿 菩,箔44的 不同的尺寸 範圍內),且 :介於3 0 °和 槽可約與縱 63°(若有四 道內的液體 爲費克拉洛 拉洛尹的氧 合成時,反 話以及沿著 傳或質傳係 由適當地使 氣體速度。 I道42而變 的不同點提 反應以產生 而,若產物 的流動途徑 通道42排 -20- 590798 出。使氣流沿著箔44中的波形,則被任何氣體易於被 帶走,俾使觸媒表面上的液體積聚係減到最小程度。 將了解的是,可由相鄰通道中的催化燃燒來提供蒸 汽/甲烷重組反應的熱(如上述),但是作爲替代例,燃燒 可發生在外部燃燒器(如層流燃燒器)中,約900或1000 °C之非常熱的廢氣係通經第1圖的反應器1 4之第二氣 流通道,與甲烷的流動方向成反向;此使得重組器16 內的反應氣體能抵達與9 00 °C同樣高的最終溫度。在此 情況中,未必要在具有陶瓷塗層或觸媒的燃燒通道中提 供箔,但是藉由傳遞熱量給分隔板4 1,該箔應能增進帶 有熱廢氣的第二氣流通道與預重組器和重組器通道中 的反應物之間的熱傳遞。在催化反應器1 4的燃燒通道 中,若使用催化燃燒來產生熱(如所示)時,則燃燒觸媒 本身可被薄的多孔惰性陶瓷層所塗覆,俾限制氣體混合 物與觸媒的接觸,及因此限制反應速率,尤其在通道的 開始處。 特別地,當無法取得氫時,可使電流直接通過形成 反應器用的板,而提供電熱。此可在最初使用以提高溫 度,例如在供應氣體之前將重組反應器1 4的溫度提高 到例如40CTC,以確保催化燃燒的發生。在操作期間亦 可使用該電熱來調整反應器溫度。在反應器14出口附 近亦可使用該電熱,以確保進行重組反應的氣體能達到 例如9 0 0 °C的溫度。 如上述,反應器的尺寸和形狀可不同於第2圖中所 示者。一個該板可代替地,例如爲1.0mx0.5m。用於形 590798 成反應器的堆疊體可爲 〇.8m厚。數個該反應器可合倂 成一個反應模組,例如十個該反應器可形成一種模組, 其設有互連的管路,俾氣流係平行地經過模組內所有的 反應器。該模組可小到足以在I S 0結構鋼架中被運輸, 且可具有足夠的容量來製造相當每日1〇〇〇桶的合成油 的合成氣。 實際的設備可能需要數個該模組,全部皆以平行的 氣流來操作,但是其可能不需要複製設備的其它特徵 (例如熱交換器18、11、20等,及分離器31和35)。因 此,可以說,反應器14由六或十個模組所構成,且費 雪-闕布希反應器2 6有相同數目的模組。其係有利的, 因爲當必須分離及拿開模組以便保養時,其容許僅稍微 地減少容量而能繼續操作。 [圖式簡單說明] 第1圖係本發明的化學方法之流程圖;及 第2圖係一適用於進行第1圖中所示方法之步驟的 反應器之平面圖。 符號說明: 4 進料氣 5 漩渦式滌氣器 6 栗 7 漩渦式滌氣器 8 過濾器 9 泵 10 進料氣 -22- 熱交換器 混合器 反應器 預重組器 重組器 通道 熱交換器 熱交換器 壓縮機 導管 導管 反應器 蒸汽發生器、熱交換器 冷凝器 分離器 冷凍式冷凝器 減壓渦輪 導管 儲槽 閥 重力分離器 反應器 板 溝槽 陸面 -23- 590798 44 箔 46 頭部 47 鰭片 48 頭部 -24
Claims (1)
- 590798 拾、申請專利範圍 @ t 第9 1 1 3 5 1 7 6號「催化反應器及方法㈡」專利案 (9 3年3月修正) 1 . 一種用於進行蒸汽/甲烷重組以產生一氧化碳和氫之 方法,其中該方法係在一於金屬片之間界定窄流體通 道的催化反應器中進行,該金屬片隔開流體通道與 熱源,且該流體通道內設有流體可透過性結構,該流 體可透過性結構倂有一用於蒸汽/甲烷重組反應的觸媒, 該方法包括下列步驟: (a )混合一含有甲烷和蒸汽的原料氣體以形成一種氣體 混合物,其中蒸汽對甲烷的比例係在1 . 3至1 . 6的範圍 內; (b )使氣體混合物流經該窄流體通道,流速爲使得在通 道內的滯流時間爲少於0 . 5秒;及 (c )調整熱源以使得沿著通道的平均溫度及通道的出口 溫度皆在7 5 0 °C至9 00°C的範圍內; 且該方法亦包括: (d )致使可燃燒性氣體的燃燒; (e )冷凝由於燃燒所產生的水蒸氣;及 (f )由此經冷凝的水蒸氣形成蒸汽,此蒸汽提供至少一 部分用於形成蒸汽和甲烷之混合物所需的蒸汽。 2 .如申請專利範圍第1項之方法,其中可燃燒性氣體(由 其得到至少一部分的蒸汽)包括甲烷。 590798 3 .如申請專利範圍第1項之方法,其中重組反應係在大 氣壓力進行。 4 .如申請專利範圍第1項之方法,其之進行係使用一種 催化反應器,此催化反應器界定交替排列著的相鄰通 道,以用於蒸汽/甲烷重組反應及用於放熱反應。 5 .如申請專利範圍第1項之方法,其中可燃燒性氣體包 括甲院和氣。 6 .如申請專利範圍第 5項之方法,其中至少部分的氫 係由蒸汽/甲烷重組程序所產生者。 7 .如申請專利範圍第 6項之方法,其中進行燃燒的氫 係爲在使來自蒸汽/甲烷重組程序的一氧化碳和氫接 受後續的費雪-闕布希合成之後所留存的氫。 8 .如申請專利範圍第1項之方法,其中藉由冷凝來自蒸 汽/甲烷重組程序的水蒸氣以部分地供應蒸汽。 9 .如申請專利範圍第1項之方法,其藉由使來自蒸汽/ 甲烷重組程序的一氧化碳和氫接受後續的費雪-闕布 希合成而產生的水,來部分地供應蒸汽。 1 〇 .如申請專利範圍第9項之方法,其中由費雪-闕布希 合成供應至蒸汽/甲烷重組的蒸汽不僅包含蒸汽而且 包含該合成中所產生的水溶性有機化合物之蒸氣。
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-
2002
- 2002-12-02 BR BR0206966-0A patent/BR0206966A/pt not_active Application Discontinuation
- 2002-12-02 AU AU2002349143A patent/AU2002349143A1/en not_active Abandoned
- 2002-12-02 GB GB0412152A patent/GB2399516B/en not_active Expired - Fee Related
- 2002-12-02 WO PCT/GB2002/005424 patent/WO2003048034A1/en not_active Application Discontinuation
- 2002-12-02 US US10/497,785 patent/US20050171217A1/en not_active Abandoned
- 2002-12-02 BR BRPI0216052-8A patent/BR0216052B1/pt active IP Right Grant
- 2002-12-03 MY MYPI20024531A patent/MY129719A/en unknown
- 2002-12-04 TW TW091135176A patent/TW590798B/zh not_active IP Right Cessation
-
2003
- 2003-08-04 NO NO20033454A patent/NO20033454L/no not_active Application Discontinuation
-
2008
- 2008-04-14 US US12/081,303 patent/US8021633B2/en not_active Expired - Fee Related
-
2011
- 2011-09-19 US US13/235,784 patent/US8753589B2/en not_active Expired - Lifetime
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2014
- 2014-04-30 US US14/265,617 patent/US20140234168A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
NO20033454L (no) | 2003-10-06 |
BR0216052B1 (pt) | 2012-12-11 |
GB0412152D0 (en) | 2004-06-30 |
GB2399516A (en) | 2004-09-22 |
AU2002349143A1 (en) | 2003-06-17 |
US20080194712A1 (en) | 2008-08-14 |
MY129719A (en) | 2007-04-30 |
BR0206966A (pt) | 2004-03-09 |
US20120058028A1 (en) | 2012-03-08 |
WO2003048034A1 (en) | 2003-06-12 |
US8753589B2 (en) | 2014-06-17 |
GB2399516B (en) | 2005-03-16 |
US20140234168A1 (en) | 2014-08-21 |
US20050171217A1 (en) | 2005-08-04 |
US8021633B2 (en) | 2011-09-20 |
NO20033454D0 (no) | 2003-08-04 |
TW200300703A (en) | 2003-06-16 |
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