TW201602336A - 天然油及脂之催化脫氧方法 - Google Patents
天然油及脂之催化脫氧方法 Download PDFInfo
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- TW201602336A TW201602336A TW104118235A TW104118235A TW201602336A TW 201602336 A TW201602336 A TW 201602336A TW 104118235 A TW104118235 A TW 104118235A TW 104118235 A TW104118235 A TW 104118235A TW 201602336 A TW201602336 A TW 201602336A
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- oxide
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- C10G3/45—Catalytic treatment characterised by the catalyst used containing iron group metals or compounds thereof
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- B01J35/615—100-500 m2/g
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- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G3/00—Production of liquid hydrocarbon mixtures from oxygen-containing organic materials, e.g. fatty oils, fatty acids
- C10G3/42—Catalytic treatment
- C10G3/44—Catalytic treatment characterised by the catalyst used
- C10G3/45—Catalytic treatment characterised by the catalyst used containing iron group metals or compounds thereof
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G3/00—Production of liquid hydrocarbon mixtures from oxygen-containing organic materials, e.g. fatty oils, fatty acids
- C10G3/42—Catalytic treatment
- C10G3/44—Catalytic treatment characterised by the catalyst used
- C10G3/48—Catalytic treatment characterised by the catalyst used further characterised by the catalyst support
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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Abstract
一種用於使包含天然油或脂或其衍生物之可再生油脫氧的方法,該等天然油或脂或其衍生物包含三酸甘油酯或游離脂肪酸,該方法包括下列步驟:提供催化劑,以及在足以使可再生油脫氧的條件下,使可再生油與催化劑接觸;該催化劑包含主要包含氧化鋁之撐體、該撐體上具有以Mo及選自由Ni及Co所組成之群組中之至少一者為基礎的金屬化合物、以及選自由Cu及Cr所組成之群組中之至少一者。
Description
此發明係關於氫處理催化劑(hydrotreating catalyst)配方以及其於固定床連續法(fixed bed continuous process)中之用途,以提供顯著優異的氧移除效能。
可再生柴油(renewable diesel)可在兩步驟製程(two-step process)中自天然油(natural oils)及脂(greases)(植物油及動物脂肪)製成:步驟(1)經由氫處理脫氧以形成正烷烴(n-paraffins),其中氧係以H2O及/或CO/CO2形式移除,以及步驟(2)使步驟1中形成的正烷烴異構化(isomerization)/裂解(cracking)以依需求產生支鏈柴油(branched diesel)及噴射機燃料(jet fuel)產物。
現今,上述之脫氧步驟(1)係使用單一或多層催化床方法(catalytic bed approach)並使用標準的氫處理型催化劑商業化地進行,該氫處理型催化劑與使用於石油脫硫(petroleum desulfurization)及脫氮(denitrogenation)應用中之催化劑類似。該等催化劑典型地係以在擠出撐體(extruded support)上之Ni、Mo及選擇
性地P為基礎,該擠出撐體主要含有Al2O3。該等催化劑於製程期間經製備為氧化物,且隨後經原位(in situ)或異地(ex situ)之活化程序轉換為活性硫化狀態。
可用來提供脫氧及氫化(hydrogenation)功能之其他活性部位的實例為硫化卑金屬(sulfided base metals)如硫化NiMo或硫化CoMo或硫化NiW。卑金屬為在空氣中加熱時會氧化的金屬。除了鎳(nickel)、鉬(molybdenum)、及鎢(tungsten)以外,可作為本文中之催化劑組分之其他卑金屬包括鐵(iron)、鉛(lead)、鋅(zinc)、銅(copper)、錫(tin)、鍺(germanium)、鉻(chromium)、鈦(titanium)、鈷(cobalt)、錸(rhenium)、銦(indium)、鎵(gallium)、鈾(uranium)、鏑(dysprosium)、鉈(thallium)、及其混合物。雖然引用文獻使用NiMo催化劑,但此引用文獻並未具體教示或例示以Cu或Cr作為促進劑(promoter)。
美國專利申請案第20110258916號(US Patent Application No.20110258916)教示一種氫處理方法,其係在氫及氫化催化劑存在下進行,該氫化催化劑含有撐體(support)以及一或多種選自第VIII族金屬及第VIB族(第6族-鉻族)金屬之金屬。該文中之段落教示可使用之催化劑皆為所屬技術領域中所習知的氫化及氫處理催化劑,且含有經適當支撐的一或多種選自第VIII族(Fe,Co,Ni,Ru,Rh,Pd,Os,Ir,Pt)金屬及第VIB族(Cr,Mo,W)金屬之金屬。雖然此引用文獻教示NiMo為習知的,但其並未直接教示或例示Cu及Cr。該文中之實例使用硫化NiMo/Al2O3。
美國專利申請案第20070175795號(US Patent Application No.20070175795)請求保護一種用於脫氧之催化劑,其係以具有氧化鋅及包括鉻及銅之呈還原態的促進劑氧化物之吸收劑配方為基礎。然而,該文中之配方不同於本發明。雖然US‘795之製程敘述一種其中促進劑金屬係選自由鎳、鈷、鐵、錳(manganese)、鎢、銀(silver)、金(gold)、銅、鉑(platinum)、鋅、錫、釕(ruthenium)、鉬、銻(antimony)、釩(vanadium)、銥(iridium)、鉻、及鈀(palladium)所組成的群組之製程,但該引用文獻僅建議而非具體教示促進劑金屬為銅或鉻。
美國專利第8,043,600號(U.S.Patent No.8,043,600)在其說明書中提及使用第VIB族(第6族)及第VIII族作為催化劑用於氫處理天然油。同樣地,上述引用文獻並無對促進劑金屬為銅或鉻之任何具體教示。
本發明係關於催化劑配方以及其於固定床連續法之用途,以提供相較於上述製程的步驟1中之習用氫處理催化劑更為優異的氧移除效能。
該等催化劑含有Mo以及選自Ni及Co之至少一者作為彼等之主要(典型)活性組分,並且係經Cr、Cu及其混合物之氧化物促進。該等金屬氧化物促進劑通常不存在於習用之商用氫處理催化劑中。在和其他先前技術的金屬促進劑相同之操作條件下,該等配方提供非預期的優異氧移除活性。
圖1顯示本發明催化劑與不具有促進劑的比較性催化劑之間的氧移除隨溫度之變化。
圖2顯示將Cr添加至商用NiMo催化劑對於餘氧含量的影響。
圖3顯示本發明催化劑與比較性催化劑之間的氧移除隨溫度之變化。
圖4顯示在100%氧轉換下,本發明與比較性催化劑的烴產物選擇性。
本發明係參照本發明之實施例加以說明。本發明之說明全文係參照圖1至圖4之圖表。
可再生柴油燃料(renewable diesel fuel)可在兩步驟製程中自天然油及脂製成:步驟(1)經由催化氫處理脫氧以形成正烷烴,其中以H2O及/或CO/CO2形式移除氧,以及步驟(2)使步驟1中形成的正烷烴異構化/裂解以產生支鏈柴油以及噴射機燃料產物。
在本文中所使用之天然油及脂為選自或衍生自動物脂肪、植物、或藻類(algae)物質者,且經常被稱為可再生油(renewable oil)。天然油並非以石油或其他化石燃料來源為基礎。可使用於本發明中的可再生油包括任何包含含氧化合物如甘油酯(glycerides)、脂肪酸烷基酯(fatty acid alkyl esters)及游離脂肪酸(FFA)之可再生油。如於美國專利第4,992,605號(US Patent No.
4,992,605)中所述,當在適當反應條件下與催化劑接觸時,該等含氧組分可轉換成烴。該等原料的實例包括但不限於:芥菜油(canola oil)、玉米油(corn oil)、大豆油(soy oils)、油菜子油(rapeseed oil)、黃豆油(soybean oil)、菜籽油(colza oil)、松油(tall oil)、葵花子油(sunflower oil)、***籽油(hempseed oil)、橄欖油(olive oil)、亞麻子油(linseed oil)、椰子油(coconut oil)、菎麻油(castor oil)、花生油(peanut oil)、棕櫚油(palm oil)、芥子油(mustard oil)、棉籽油(cottonseed oil)、牛脂(tallow)、黃牛油(yellow grease)及棕油脂(brown grease)、豬油(lard)、鯨油(train oil)、乳脂(fats in milk)、魚油(fish oil)、藻油(algal oil)、污水污泥(sewage sludge)、萼距花油(cuphea oil)、亞麻薺油(camelina oil)、痲瘋果油(jatropha oil)、麻風樹油(curcas oil)、巴巴蘇油(babassu oil)、棕櫚仁油(palm kernel oil)、兩節薺子油(crambe oil)及類似物。用以描述該等原料之另一用語為生物可再生(biorenewable)。
.如可理解的,可再生油不一定必須是天然存在的,但可為衍生物,例如上述之脂肪酸烷基酯。當三酸甘油酯原料在轉酯(transesterification)催化劑存在及產生脂肪酸烷基酯之條件下與醇接觸時,可產生該等脂肪酸烷基酯。添加至反應器之醇可為一般用於將含三酸甘油酯之原料轉換成酯的單一醇或兩種或更多種醇之混合物。適當的醇包括具有一至六個碳之醇,且典型地為單醇(monoalcohol)。甲醇(methanol)通常為適用之醇,但
醇可包括高級單醇,如乙醇、1-丙醇、異丙醇、1-丁醇、異丁醇、1-戊醇、或1-己醇。
於轉酯反應中,醇對三酸甘油酯之莫耳比一般是在3:1至30:1之範圍內,且典型地在5:1至25:1之莫耳比中。醇對三酸甘油酯之莫耳比低於3:1時,較可能導致低於三酸甘油酯至脂肪酸烷基酯之化學計量轉換的情況。大於30:1之較高的醇對三酸甘油酯之莫耳比亦為不利,因為存在增加的甲醇量導致在下游處理步驟中要花費高出許多的成本進行甲醇之分離/回收。因此,上述範圍所選定的醇對三酸甘油酯之莫耳比代表經濟上合理的比率,當使用其他本文中所述之條件、或使用在本文中所述類型之反應中習用的其他條件時,該莫耳比在上述範圍之外則無法預期到轉換發生。
轉酯反應使用之催化劑可為均質或非均質之催化劑。適當的均質催化劑包括甲氧化鹼金屬(alkali methoxide)、氫氧化鹼金屬(alkali hydroxides)、及其混合物,包括但不限於甲氧化鈉、甲氧化鉀、氫氧化鈉、及氫氧化鉀。適當的非均質催化劑包括該些於美國專利WO 2006/050925;US 2009/0069586;US 5,908,946;WO 2007/025360;或US 7,420,073中所敘述者,其內容以參照方式併入本文中。
所產生的酯衍生物取決於醇中的碳數。甲醇經常被用於轉酯反應以及使用甲醇產生脂肪酸甲基酯(亦稱為FAME)之反應中。當於轉酯反應中使用乙醇、丙醇、丁醇、戊醇、及己醇時,分別產生乙基酯、丙基酯、丁基酯、戊基酯、及己基酯。
轉酯反應係在一般條件下於催化劑存在下進行。該反應可在批式反應器、連續(例如攪拌)槽式反應器、以及固定床反應器中進行。反應器之條件應為足以利用轉酯而將三酸甘油酯轉換成酯之條件。上述條件(亦稱為轉酯條件)包括在40℃至250℃之範圍內的溫度,更典型地是在60至200℃之範圍內。典型的壓力會在1至100大氣壓(atm)的範圍內,更典型地是1至50atm,而最終壓力取決於反應中使用之具體醇以及反應溫度。
典型植物油或動物脂肪之甘油酯、FFA及脂肪酸烷基酯的結構含有約8至約24個碳原子之脂肪族烴鏈,其中大多數油含有高濃度之16及18個碳原子之脂肪酸。天然油原料中之氧含量可在0.5至20wt%之範圍內,且更典型地是在5至15wt%。上述原料可含有微量雜質,如P、Na、Ca、Mg、及K,該等雜質源自磷脂(phospholipid),其為油中天然存在之一類化合物。這些雜質對於脫氧製程之效能有不利影響,因此在此步驟之前必須被移除至ppm等級的含量。為達此目的所採用之典型預處理製程包括但不限於:使用固體吸附劑諸如矽凝膠(silica gel)(如美國專利第5,231,201號中所述者)、離子交換樹脂(如美國專利申請案第20060264684號中所述者)及黏土(clay)之低溫批式製程(low temperature batch processes)、以及使用氫處理領域中廣為周知之使用操作於較高溫度下的氫處理型催化劑之保護反應器(guard reactor)。上述原料亦可含有少量衍生自動物蛋白質或葉綠素之氮化合物。氮含量典型地是在0.5ppm至
5000ppm之範圍內。如美國專利申請案第20110245551號中所討論的,亦可採用包含使用操作於氫處理條件下的保護反應器之額外選擇性預處理步驟,以使原料中的不飽和脂肪酸組分飽和來預防副反應(諸如脫氧步驟中之聚合作用)。
可再生原料及衍生自化石燃料之烴之混合物或共原料(co-feeds)亦可被用來作為原料。
使天然油及脂脫氧以形成正烷烴係使用單層或多層催化床方法來進行。於脫氧製程期間,三酸甘油酯中之脂肪酸鏈係轉換成正烷烴,而三酸甘油酯之甘油酯部分係轉換成丙烷(propane)。典型地,來自天然油之脫氧的烴產物分布顯示偶數及奇數碳數之正烷烴的混合物,其中偶數碳係經由以水的形式移除氧所產生,而奇數碳係經由以CO或CO2的形式移除氧所產生。對於偶數烷烴之較高選擇性顯示在柴油產物中有較高碳滯留,且與較高的氫消耗量有關。對於奇數烷烴之較高選擇性則與較低的氫消耗量有關,且在柴油產物中有較低碳滯留。
典型地,脫氧製程使用硫化氫處理型催化劑。如美國專利第7,491,858號所述,亦可使用其他以如Pd之貴金屬為基礎的催化劑,以提供對於以CO及CO2的形式移除氧之較高選擇性,並且使H2之消耗量最小化。本發明係與使用硫化催化劑之脫氧製程有關。
一般而言,催化床為團塊(pellets)或擠出物(extrudates)的固定床,其在施加氫氣壓(hydrogen
pressure)及昇高的溫度下以涓流(trickle)(下向流(downflow))模式或淹沒床(flooded bed)(上向流(upflow))模式操作。典型地,天然油及脂亦可加入少量的有機硫化合物(諸如以SULFRZOL(Lubrizol Corporation)市售之二硫二丁烷(dibutyl disulfide))以確保催化劑上的活性部位在反應期間維持在硫化狀態。除了H2O、CO CO2、及丙烷以外,氣體產物部分亦含有在脫硫反應期間所形成的H2S。在以動物脂肪或其他含氮原料進行反應的情況下,氣體產物亦可含有經由脫氮反應形成之NH3。
於商用製程中,脫氧步驟之後為產物分離步驟,以在氫異構化(hydroisomerization)或氫裂解(hydrocracking)步驟之前,從液體柴油產物移除氣體產物。脫氧步驟典型地是在超過化學計量所需量的過剩氫存在下進行,最高可能達二至三倍的過剩量。上述製程亦可包含產物及氣體的回收,以改善反應器中的熱平衡(heat balance)。
用於本發明之脫氧製程中的適當催化劑為該些催化性金屬係提供於撐體上者,撐體主要包含氧化鋁,典型地是BET表面積至少150m2/g且孔隙體積(pore volume)至少0.5cc/g之擠出γ型氧化鋁(extruded gamma alumina)。然而,撐體可包含任何具有足夠強度及多孔性(porosity)以發揮撐體功能的適當材料。催化劑可為粒狀形式(顆粒(granules)、珠粒(beads)、球體(spheres)、錠(tablets)、以及擠出物(extrudates)),舉例而言,該些適用於為了連續操作而設計的固定床反應器者。粒狀形式
可具有在0.1至10mm範圍內的尺寸,更典型地是在0.5至5mm的範圍內。該形式可為任何形狀,舉例而言,圓柱狀(cylindrical)、三葉狀(trilobe)或四葉狀(quadrulobe)。粒化製程可為混合(mixing)與擠製(extrusion)之組合。用於擠製機(extruder)進料(feed)的配方可選擇性地包含除了氧化鋁以外的其他氧化物,例如SiO2、TiO2及ZrO2、MgO、或黏土。氧化物可修飾最終撐體之孔隙特性(pore characteristics)及/或機械強度(mechanical strength)(以粉碎強度(crush strength)測量)。亦可使用諸如甲基纖維素(methyl cellulose)(舉例而言,市售之METHOCEL(Dow Chemical Company))的擠製輔助(extrusion aids),以改善經由擠製機進料的處理。為了使氧化鋁或其他氧化物膠化(peptization)而形成黏結劑(binder),亦可添加選擇性的酸如硝酸(nitric acid),藉此對粒化材料(granulated material)增強機械強度。可以任何形式將無機氧化物或氧化物添加至混合設備,如漿料(slurry)、可膠化固體(peptizable solid)、或液體。氧化鋁(aluminum oxide)、氫氧化鋁(aluminum hydroxide)、二氧化矽(silicon dioxide)、二氧化鈦(titanium dioxide)、以及氧化鋯(zirconium oxide)典型地係以固體添加或處理。硝酸鋁(aluminum nitrate)、氫氧化鋁(aluminum hydroxide)、四乙基正矽酸鹽(tetra ethyl ortho silicate,TEOS)、異丙醇鈦(titanium isopropoxide)以及硝酸氧鋯(zirconyl nitrate)為添加至混合設備中之典型液體形式材料。亦可使用膠體形式,如矽酸膠
(colloidal silica)。可將無機氧化物作為單獨成分或作為混合氧化物添加至設備中,其中該混合氧化物係使用包含但不限於共沉澱(co-precipitation)之技術製備。
此外,調整水之含量以最佳化催化劑的擠製性(extrudability)。形成擠製機進料之配方先在混合機中進行混合(例如Sigma或Eirich混合機),然後經由市售的單螺旋(single screw)或雙螺旋(twin screw)擠製機擠出。然後使所擠出的材料乾燥並進行煆燒(calcined),以形成催化劑成品。粒化顆粒的實施例典型地是在形成製程期間於500℉至2000℉的溫度下進行煆燒,更佳地是700℉至1800℉,且最佳地是900℉至1600℉。亦可用上述之類似成分將催化劑粒化成球形(spherical)形式,但係在Eirich或Naute混合機中完成,隨後進行類似的乾燥/煆燒(calcination)製程。
提供於撐體上的催化劑金屬化合物是以Mo、選自Ni及Co之至少一者為基礎,並且包括選自Cu及Cr之至少一者的至少一種促進劑金屬。就是這種與MoNi、MoCo、或MoNiCo組合的特定促進劑金屬提供本催化劑優異的脫氧活性。
選自由Cu及Cr所組成的群組之促進劑金屬係以足以顯著增強天然油及脂之脫氧的量包含於催化劑中。催化劑中促進劑的量以氧化物計算較佳地係在0.5至10wt%範圍內,更佳地在1wt%至6wt%範圍內,最佳地在1.5至5.0wt%的範圍內。
可使用所屬技術領域所習知的標準浸漬(impregnation)技術,例如含有活性金屬前驅物之溶液的初濕浸漬法(incipient wetness inpregnation),使促進劑金屬連同Ni、Mo、Co卑金屬被納入擠出物撐體上。該等前驅物包括但不限於硝酸鹽(nitrates)、碳酸鹽(carbonates)、草酸鹽(oxalates)等。典型地是於上述浸漬步驟後進行乾燥及煆燒步驟,以將促進劑金屬前驅物轉換為氧化物形式。乾燥典型地在200℉至400℉的溫度範圍內進行。最終煆燒典型地在500℉至2000℉的溫度範圍內進行,更佳地700℉至1800℉,且最佳地900℉至1600℉。
選擇性地,可在催化劑製備製程的混合步驟期間添加該等促進劑金屬的一部分或全部,且可以任何形式添加,包括但不限於金屬溶液。
催化劑於製程期間被製備為氧化物,隨後以原位或異地活化程序轉換為活性硫化狀態。於活化步驟期間,部分或大部分的該等金屬氧化物配方可被轉換成硫化狀態。活化步驟典型地是藉由使催化劑暴露於一或多種含硫化合物及氫而進行,且反應器溫度從約70℉控制升高至約650℉。
在較佳地約400℉至約800℉、更佳地在450及700℉之間、且最佳地在500及650℉之間的催化劑溫度下,藉由使天然油或脂暴露於催化劑完成脫氧,可達到優異的脫氧結果。操作壓力較佳地是約100至2500psig,更佳地是約250至2000psig,且最佳地是約400
至1500psig。用於催化製程的原料處理率(processing rate)可以例如每時液體空間速度(Liquid Hourly Space Velocity,LHSV)表示,LHSV係定義為反應物的體積流率(volumetric flow rate)除以反應器中活性催化劑的體積。吾等製程中之LHSV可在0.1至10h-1的範圍、更佳地是0.2至5.0h-1、且最佳地是0.5至2.0h-1。於下文中,將參照實例更詳細敘述本發明。然而,本發明之範疇並不限於在下述實例中所提出的具體細節。
實例中用於篩選之材料:經2.0至4.7wt% Cr2O3、1.9wt% CuO、3.4% Fe2O3、及3.8% ZnO促進之NiMoP/Al2O3-SiO2催化劑。
如以下所述製備NiMo的混合金屬溶液。將預稱量的水、磷酸(phosphoric acid)(75wt%)、三氧化鉬(molybdenum trioxide)、以及鹼式碳酸鎳(basic nickel carbonate)(40wt% Ni)添加至鍋(kettle)中並攪拌加熱至200℉。將該混合物於200℉下蒸煮3小時或直到溶液澄清。視需求進行水的添加,以補償因蒸發造成的任何損失。隨後將該混合物冷卻至室溫。對於65ml的此前驅物溶液,添加18.6g的九水硝酸鉻(chromium nitrate nonahydrate)以及35ml的水。此溶液混合物係經浸漬到99g的氧化鋁-二氧化矽擠出物撐體(1/16”不對稱四葉(asymmetric quadrulobes))上至初濕。然後將該浸漬催化劑於248℉隔夜乾燥,隨後於高溫爐(muffle furnace)中在
1112℉煆燒1小時。將所得的催化劑表示為催化劑A,其含有23.2% MoO3、5.0% NiO、3.4% P2O5、2.2wt% SiO2、及2.0wt% Cr2O3,且具有209m2/g的BET表面積。
如以下所述製備NiMo的混合金屬溶液。將預稱量的水、磷酸(75wt%)、三氧化鉬、以及鹼式碳酸鎳(40wt% Ni)添加至鍋中並攪拌加熱至200℉。將上述混合物於200℉蒸煮3小時或直到溶液澄清。視需求進行水的添加,以補償因蒸發造成的任何損失。隨後將該混合物冷卻至室溫。對於65ml的此前驅物溶液,添加37.2g的九水硝酸鉻以及25ml的水。此溶液混合物係經浸漬到99g的氧化鋁-二氧化矽擠出物撐體(1/16”不對稱四葉)上至初濕。然後將該浸漬催化劑於248℉隔夜乾燥,隨後於高溫爐中在1112℉煆燒1小時。將所得的催化劑表示為催化劑B,其含有20.4% MoO3、5.2% NiO、3.4% P2O5、2.6wt% SiO2、及4.1wt% Cr2O3,且具有207m2/g的BET表面積。
如以下所述製備NiMo的混合金屬溶液。將預稱量的水、磷酸(75wt%)、三氧化鉬、以及鹼式碳酸鎳(40wt% Ni)添加至鍋中並攪拌加熱至200℉。將上述混合物於200℉蒸煮3小時或直到溶液澄清。視需求進行
水的添加,以補償因蒸發造成的任何損失。隨後將該混合物冷卻至室溫。對於65ml的此前驅物溶液,添加37.2g的三水硝酸銅(copper nitrate trihydrate)以及25ml的水。此溶液混合物係經浸漬到99g的氧化鋁-二氧化矽擠出物撐體(1/16”不對稱四葉)上至初濕。然後將該浸漬催化劑於248℉隔夜乾燥,隨後於高溫爐中在1112℉煆燒1小時。將所得的催化劑表示為催化劑C,其含有23.8% MoO3、4.8% NiO、3.7% P2O5、2.4wt% SiO2、及1.9wt% CuO,且具有182m2/g的BET表面積。
在此例中使用的參考催化劑(reference catalyst)為商用NiMoP氫處理催化劑,其為從Advanced Refining Technologies收到,且為經由將NiMoP前驅物溶液浸漬到相同的撐體上所製得。參考催化劑含有27.3% MoO3、5.4% NiO、4.3% P2O5、及2.1wt% SiO2,且具有170m2/g的BET表面積,將其表示為催化劑D。
如以下所述製備催化劑E。將30g的九水硝酸鉻溶解於60ml水中製備鉻溶液。此溶液係經浸漬到97g的催化劑D上。將該浸漬催化劑於248℉隔夜乾燥,隨後於高溫爐中在1112℉煆燒1小時。所得的催化劑含有25% MoO3、5.4% NiO、4.1% P2O5、2.2wt% SiO2、及4.7wt% Cr2O3,其具有177m2/g的BET表面積。
如以下所述製備NiMo的混合金屬溶液。將預稱量的水、磷酸(75wt%)、三氧化鉬、以及鹼式碳酸鎳(40wt% Ni)添加至鍋中並攪拌加熱至200℉。將該混合物於200℉蒸煮3小時或直到溶液澄清。視需求進行水的添加,以補償因蒸發造成的任何損失。隨後將該混合物冷卻至室溫。對於65ml的此前驅物溶液,添加藉由將24g的九水硝酸鐵(iron nitrate nonahydrate)分開溶解於20ml的水中所製備之溶液。此溶液混合物係經浸漬到99g的氧化鋁-二氧化矽擠出物撐體(1/16”不對稱四葉)上至初濕。然後將該浸漬催化劑於248℉隔夜乾燥,隨後於高溫爐中在1112℉煆燒1小時。將所得的催化劑表示為催化劑F,其含有27.9% MoO3、4.5% NiO、4.1% P2O5、2.0wt% SiO2、及3.4wt% Fe2O3,且具有201m2/g的BET表面積。
如以下所述製備NiMo的混合金屬溶液。將預稱量的水、磷酸(75wt%)、三氧化鉬、以及鹼式碳酸鎳(40wt% Ni)添加至鍋中並攪拌加熱至200℉。將上述混合物於200℉蒸煮3小時或直到溶液澄清。視需求進行水的添加,以補償因蒸發造成的任何損失。隨後將該混合物冷卻至室溫。對於58ml的此前驅物溶液,添加藉由將22g的六水硝酸鋅(zinc nitrate hexahydrate)分開溶
解於42ml的水中所製備之溶液。此溶液混合物係經浸漬至99g的氧化鋁-二氧化矽擠出物撐體(1/16”不對稱四葉)上至初濕。然後將該浸漬催化劑於248℉隔夜乾燥,隨後於高溫爐中在1112℉煆燒2小時。將所得的催化劑表示為催化劑G,其含有28.7% MoO3、5.7% NiO、4.3% P2O5、2.4wt% SiO2、及3.8wt% ZnO,且具有100m2/g的BET表面積。催化劑G顯著較低的表面積亦暗示了ZnO添加至該催化劑配方的燒結效果(sintering effect)。
評估催化劑A至G用於固定床反應器中的天然油脫氧。
在上向流模式的固定床反應器中,評估催化劑A至G移除三酸甘油酯之氧的效能。為了較好的熱分配,以α氧化鋁珠粒(alpha alumina beads)(具有非常小的表面積)稀釋活性催化劑床。使用煤油(kerosene)及H2且令溫度自室溫多步驟升高至630℉,以將催化劑轉換成活性硫化物。隨後將該流(flow)切換成添加100ppmw S(使用SULFRZOL-二硫二丁烷)與H2之精製黃豆油。所使用的條件為H2:油比率5600 SCFB(標準ft3/桶)、壓力750psia、及500至575℉的溫度範圍。催化劑A至D、F、及G係於每時重量空間速度(Weight Hourly Space Velocity)1.0h-1下評估,而催化劑D及E係於每時液體空間速度1.0h-1下評估(大致對應於每時重量空間速度1.3h-1)。使用氣相層析法來分析由反應而來的液體及氣體產物。
如圖1中可見,與標準催化劑D比較,催化劑A至C隨溫度變化達到非預期地較高程度之氧移除。具體來說,在500℉的溫度下,催化劑D顯示3.1wt%餘氧的基線。另一方面,催化劑B達到更低許多的2.1wt%總氧量,與基線相比減少33%之餘氧。催化劑A顯示0.97wt%的餘氧含量,與催化劑D基線相比減少69%。進而,催化劑C顯示0.45wt%的餘氧含量,與基線相比減少86%。
圖2顯示將Cr添加至商用NiMo催化劑(催化劑D)時顯著改良氧量。
如上所述,各種促進劑金屬先前已作為促進劑金屬使用,但是特定包括Cu或Cr促進本發明催化劑之非預期的優異脫氧結果。
圖3顯示包括Cu及Cr的本發明催化劑與包括不同促進劑金屬的比較性催化劑之間隨溫度變化之氧移除。可觀察到的是,與基線NiMo催化劑相比,Cu及Cr帶來優異的氧減少效能,而添加Fe及Zn對於效能則有不利影響。
重要的是,本催化劑於脫氧活性之改良是在對於氣體或液體產物之選擇性無顯著改變的情況下達成。
圖4顯示在100%氧轉換下本發明催化劑與比較性催化劑的烴產物選擇性。可觀察到的是,催化劑A、B、C、及E的較高脫氧活性亦伴隨對於偶數產物之較高選擇性。
本發明之脫氧方法使用含有Mo及Ni及/或Co作為主要活性組分、且經一般氫處理催化劑中通常不存在的Cr、Cu、及其混合物之氧化物促進之催化劑,在與其他先前技術的金屬促進劑相同之操作條件下提供了非預期的優異氧移除活性。
前述實例及實施例僅用於說明目的而呈現,並非意圖限縮本發明之範疇。進而,雖然已藉由一些實施例揭示或敘述了本發明,但對所屬技術領域中具通常知識者而言顯而易見的是,在不脫離如隨附請求項所定義的範疇內,對所敘述的實施例的一些修改以及本發明之其他實施例是可能的。
Claims (14)
- 一種將包含天然油或脂或其衍生物之可再生油脫氧的方法,該天然油或脂或其衍生物包含三酸甘油酯或游離脂肪酸,該方法包含下列步驟:提供催化劑,其包含:主要包含氧化鋁之撐體;提供於該撐體上之金屬化合物,該金屬化合物係以Mo以及選自由Ni及Co所組成之群組中之至少一者為基礎;以及選自由Cu及Cr所組成之群組中之至少一促進劑;以及在足以促進該可再生油之脫氧的條件下,使該可再生油與該催化劑接觸。
- 如請求項1之方法,其中該促進劑金屬為Cu。
- 如請求項1之方法,其中該促進劑金屬為Cr。
- 如請求項1之方法,其中該促進劑金屬以氧化物計算係以約1.4wt%至約3.0wt%之間的量存在於該催化劑配方中。
- 如請求項1之方法,其中該促進劑金屬係於該催化劑製程的擠製階段之前引入。
- 如請求項1之方法,其中該撐體包含至少一種來自包含二氧化矽、氧化鈦及氧化鋯之群組中之額外氧化物。
- 如請求項1之方法,其中該撐體包含二氧化矽。
- 如請求項1之方法,其中該催化劑包含磷。
- 如請求項1之方法,其中在原料中之該可再生油包含三酸甘油酯。
- 如請求項1之方法,其中在原料中之該可再生油包含游離脂肪酸。
- 如請求項1之方法,其中原料已經受一或多個預處理步驟處理,以降低包含由Na、Ca、Fe、Mg、K、及P所組成之群組中之任意者之汙染物的含量。
- 如請求項1之方法,其中使該可再生油與該催化劑接觸的步驟是在約500℉至650℉之間的溫度下進行。
- 如請求項1之方法,其中使該可再生油與該催化劑接觸的步驟是在約450psig至1500psig之間的壓力下進行。
- 如請求項1之方法,其中使該可再生油與該催化劑接觸的步驟是在0.5至2.0h-1的LHSV下進行。
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-
2015
- 2015-06-05 TW TW104118235A patent/TW201602336A/zh unknown
- 2015-06-08 SG SG11201609969VA patent/SG11201609969VA/en unknown
- 2015-06-08 CN CN201580039309.4A patent/CN106536454B/zh active Active
- 2015-06-08 DK DK15807520.0T patent/DK3152186T3/da active
- 2015-06-08 CA CA2951379A patent/CA2951379C/en active Active
- 2015-06-08 US US15/316,743 patent/US10184085B2/en active Active
- 2015-06-08 EP EP15807520.0A patent/EP3152186B1/en active Active
- 2015-06-08 WO PCT/US2015/034621 patent/WO2015191416A1/en active Application Filing
Also Published As
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WO2015191416A1 (en) | 2015-12-17 |
CA2951379A1 (en) | 2015-12-17 |
CA2951379C (en) | 2022-06-21 |
CN106536454A (zh) | 2017-03-22 |
EP3152186A4 (en) | 2017-12-20 |
EP3152186B1 (en) | 2020-11-25 |
SG11201609969VA (en) | 2016-12-29 |
DK3152186T3 (da) | 2021-01-25 |
CN106536454B (zh) | 2020-09-01 |
US20170210996A1 (en) | 2017-07-27 |
US10184085B2 (en) | 2019-01-22 |
EP3152186A1 (en) | 2017-04-12 |
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