JP4942911B2 - 水素化分解触媒、重質油を水素化分解する方法 - Google Patents
水素化分解触媒、重質油を水素化分解する方法 Download PDFInfo
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Description
アルミナ触媒に対して活性炭の酸点は少なく、また担体上に担持された金属酸化物の活性化も容易である。
・活性炭は重質留分に親和性を持ち、且つニッケル、バナジウム等の不純物を多く含むアスファルテンを選択的に吸着する。
・活性炭は比較的大きな細孔径を持ち、分子量の大きいアスファルテン等を含む重質留分の細孔内への拡散を容易にする。
・アスファルテンを多く含む重質油の分解で生成する不安定な炭化水素ラジカルに水素を添加し炭化水素ラジカルの連鎖反応を制御し、炭化水素ラジカルの重縮合反応によるコーク生成を抑制する。
・また、従来のアルミナ触媒の酸点は、重質油に含まれる塩基性化合物によって被毒され活性低下が大きくコークを生成する事態を招くが、活性炭には酸点は少なく活性低下も少ない。
・活性炭は高比表面積を有し、水素化に活性な金属を高分散で担持が可能である。
・高分散された金属酸化物はアルミナ触媒に比べて活性化も容易で、担持された金属種は有効に使われる。
・活性炭は大きな細孔容積を持ち原料油中から除去されたニッケル、バナジウムの堆積許容量が大きい。
≪活性炭の製造法≫
成型活性炭は一般的な方法で製造する。活性炭の原料炭素源には、木炭、ヤシ殻炭、泥炭、ピート、亜炭、褐炭、瀝青炭、石油コークス等がある。図1に成型活性炭の製造工程を示す。原料炭素源を8/32メッシュに粗粉砕し、200〜300℃で乾留し、乾留物を微粉砕して280メッシュ以下の微粒子が75〜85重量%以上となるようにする。これに、タール、ピッチ、澱粉等のバインダーを原料炭素源の乾留物1部に対して約0.5部混合し、更に水分が10〜20重量%となるように水を加え均一に混練する。これを押出成型機に設置したダイスから300〜600MPaの圧力で押出して成型する。ダイスの穴径は活性炭の用途によって選ばれるが、ここでは直径1mmとした。
≪アスファルテン吸着能≫
重質油はアスファルテンを多く含み、このアスファルテンには不純物である硫黄、窒素やニッケル、バナジウム等の重金属が含まれている。アスファルテンは比較的分子量の大きな化合物であり、触媒へのアスファルテンの吸着と細孔内への拡散が容易であることが重質油の水素化分解に重要である。
≪成型活性炭の触媒化≫
活性炭に金属を担持する方法は、金属硝酸化合物の水溶液を用いて一般的に知られている含浸・蒸発乾固法で行い、その後、窒素雰囲気中で硝酸塩の加熱分解を行い金属担持触媒とした。
≪コーク生成抑制能≫
水素化分解反応の過程では、比較的分子量の大きな炭化水素の結合が切断され、炭化水素ラジカルが発生する。この炭化水素ラジカルは反応性が高く連鎖的な反応を引き起こし、一つには分解による軽質化の反応が過度に進み、一方、炭化水素ラジカルが相互に結合する重縮合の反応も進み、液体成分の相平衡が崩れ、高分子量の留分が相分離によってセディメントとして析出する。このセディメントの析出や沈降によって装置や配管の汚染や閉塞が起こり、水素化分解設備の運転に支障をきたす。
転化率(重量%)
=100×(ガス+分解油中の525℃−留分)(重量)/減圧残油中の525℃+留分(重量)
コーク生成率(重量%)
=100×(コーク生成量)(重量)/減圧残油(重量)
<実施例1>
活性炭の製造法の項で述べた方法で種々の活性炭を調製した。
アスファルテンの吸着能の項で述べた方法で、活性炭のアスファルテン吸着能を調べた。
成型活性炭の触媒化の項で述べた方法で、活性炭触媒を調製し、コーク生成抑制能の項で述べた方法によって活性炭触媒のコーク生成抑制能を比較評価した。
図4は沸騰床反応装置である。触媒を充填した内容積1リットルの反応器が直列につながれている。系内にガスオイル等の軽質油を充填する。水素圧縮機(1)で水素を系内に流し、ガス圧力調節弁(19)で一定圧に調整する。循環ポンプ(5)-1、循環ポンプ(7)-2でガスオイルを循環し、沸騰床反応器(4)-1、沸騰床反応器(6)-2に充填されている触媒を流動化させながら、減圧残油が可能な温度まで昇温する。原料タンク(2)から原料供給ポンプ(3)で減圧残油を供給して所定の反応温度まで昇温し水素化分解反応を開始する。反応器からの流出物は高温高圧分離器(8)で重質留分が分離され、更に低圧分離器(12)でガスが分離され重質留分受槽(14)に払い出される。高温高圧分離器(8)で分離された軽質留分は低圧高温分離器(10)でガスと分離され、分離器(15)で途中ラインに注入された水と分離され、水は凝縮水受槽(16)に、軽質留分は軽質留分受槽(17)に払い出される。各分離器で分離されたガスはガス洗浄塔(20)で硫化水素が分離され流量測定後系外に放出される。
=100×ガス中の硫化水素重量/原料中の硫黄の重量
脱メタル率%
=100×分解油中の(ニッケル+バナジウム)重量/原料中の(ニッケル+バナジウム)重量
<実施例5>
図5に固定床反応装置(A)を示す。触媒を充填した固定床反応器(204)(容積120cc)は4系列同一のアルミブロックヒータで加熱されている。水素を減圧弁(201)を通して系内に流し、系内の圧力はガス圧力制御弁(208)で一定に保つ。原料タンク(202)の原料油を原料供給ポンプ(203)で固定床反応器(204)に供給する。反応器からの流出物は高温高圧分離器(205)でガスと分離され、分解油は分解油タンク(207)に払い出される。分離されたガスはガス圧力制御弁(208)を通して系外に放出される。
図6に固定床反応装置(B)を示す。反応器(306)(容積700cc)に触媒を充填し、ボンベから水素を減圧弁(301)で減圧し水素バッファータンク(302)を経由して流量調節弁で一定流量流す。系内の圧力はガス圧力制御弁(309)で一定に保つ。原料タンク(304)の原料を原料供給ポンプ(305)で固定床反応器(306)に供給する。反応器からの流出物は高温高圧分離器(307)でガスが分離され、ガスはガス圧力制御弁(309)を通して大気圧に減圧され少量の軽質留分が軽質分解油受槽(310)で分離された後、硫化水素除去器(311)を経由してガスメータ(312)でガス量を測り、系外に放出される。高温高圧分離器(307)で分離された分解油は分解油受槽(308)に払い出される。
=100×(堆積メタル5wt.%での活性−堆積メタル30wt.%での活性)/堆積メタル5wt.%での活性
重質油に含まれるニッケル、バナジウム等の重金属の堆積許容量が大きく活性低下が少なく、重質油類中の重金属を除去する目的で、脱硫プロセス等の前段に設けられる、ガードリアクターに充填する触媒として利用できる。
Claims (4)
- スチームで賦活され、水銀圧入法により測定した細孔容積が0.8〜1.6ml/g、且つ細孔径20〜200ナノメートル範囲の細孔の細孔容積の割合が30%以上、且つ細孔径38〜90ナノメートル範囲の細孔の細孔容積の割合が細孔径20〜200ナノメートル範囲の細孔の細孔容積に対して45%以上の成型活性炭を担体とした水素化分解触媒であって
下記測定法により求められる成型活性炭のアスファルテン吸着能が22%/ml以上である重質油用の水素化分解触媒。
(アスファルテン吸着能の測定方法)
ガラス容器に減圧残油20g(アスファルテン濃度9.08重量%)と活性炭1gを入れる。
活性炭種を変え、同様に用意したガラス容器数個を1リットルのオートクレーブに仕込み、水素圧10MPa、温度250℃の条件に2時間保持した後、降温、脱圧して、これらのガラス容器を取り出し、活性炭と減圧残油をろ過によって分離する。
分離後の減圧残油のアスファルテン濃度を測定し、減圧残油に元々あったアスファルテン濃度との差で、それぞれの活性炭に吸着されたアスファルテンの量を求め、さらに下記式(1)からアスファルテン除去率を求める。
次に活性炭単位重量及び単位細孔容積あたりの吸着量に換算した値をもって、下記式(2)からアスファルテン吸着能を求める。
ノルマルヘプタン(nC7)不溶分をアスファルテンとし濃度の測定法はASTM D3279による。
アスファルテン除去率(%)=
(減圧残油に元々あったアスファルテン量−分離後の減圧残油のアスファルテン量)/減圧残油に元々あったアスファルテン量×100 (1)
アスファルテン吸着能(%/ml)=
アスファルテン除去率(%)/〔活性炭重量(g)×活性炭細孔容積(ml/g)〕 (2) - 担持金属が鉄、ニッケル、コバルト等VIIIB族の金属の何れか一つ、又はモリブデン、もしくはニッケルとモリブデン、コバルトとモリブデンである請求項1記載の重質油用の水素化分解触媒。
- 請求項2記載の水素化分解触媒を用いて、圧力 8〜20MPa、温度380〜450℃、LHSV 0.1〜1.0 hr-1、H2/Oil比 350〜1500 Nm3/kl-oilの条件で、固定床もしくは移動床、沸騰床で重質油を水素化分解する方法。
- 重質油が、525℃以上の留分を70vol.%以上含む炭化水素油、又は重金属の少なくともニッケル、バナジウムの何れか、もしくは両方を200〜2000wppm含む炭化水素油、又はアスファルテン(ヘプタン不溶分)を8〜30wt.%含む炭化水素油である請求項3記載の重質油を水素化分解する方法。
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| JP2003398454A JP4942911B2 (ja) | 2003-11-28 | 2003-11-28 | 水素化分解触媒、重質油を水素化分解する方法 |
| US10/990,084 US20050115870A1 (en) | 2003-11-28 | 2004-11-16 | Hydrocracking catalyst and method of hydrocracking heavy oil |
| EP04027906A EP1537912A1 (en) | 2003-11-28 | 2004-11-24 | Hydrocracking catalyst comprising activated carbon and method of hydrocracking heavy oil |
| CA2488265A CA2488265C (en) | 2003-11-28 | 2004-11-24 | Hydrocracking catalyst and method of hydrocracking heavy oil |
| MXPA04011780A MXPA04011780A (es) | 2003-11-28 | 2004-11-26 | Catalizador de hidrofisuracion y metodo para hidrofisurar petroleo pesado. |
| US11/649,006 US7727381B2 (en) | 2003-11-28 | 2007-01-03 | Hydrocracking catalyst and method of hydrocracking heavy oil |
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| MXPA04011780A (es) | 2005-07-26 |
| CA2488265A1 (en) | 2005-05-28 |
| JP2005154664A (ja) | 2005-06-16 |
| US20050115870A1 (en) | 2005-06-02 |
| US20070131587A1 (en) | 2007-06-14 |
| EP1537912A1 (en) | 2005-06-08 |
| CA2488265C (en) | 2013-05-28 |
| US7727381B2 (en) | 2010-06-01 |
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