JP5762672B2 - 幅広い分子量を有するポリエチレンの製造 - Google Patents
幅広い分子量を有するポリエチレンの製造 Download PDFInfo
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- JP5762672B2 JP5762672B2 JP2009135448A JP2009135448A JP5762672B2 JP 5762672 B2 JP5762672 B2 JP 5762672B2 JP 2009135448 A JP2009135448 A JP 2009135448A JP 2009135448 A JP2009135448 A JP 2009135448A JP 5762672 B2 JP5762672 B2 JP 5762672B2
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- catalyst
- molecular weight
- deale
- polymer
- silica
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
- B01J31/34—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of chromium, molybdenum or tungsten
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/12—Silica and alumina
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Description
本発明のより完全な理解のために、添付図面と共に以下の説明を参照されたい。
特に断らない限り、以下の実施例で用いた触媒はすべて下記の手順で作製した。
酸化クロム触媒の活性化:クロムが担体に既に含浸された状態で供給業者から触媒を受領した。触媒の物理的性質は表2に記載してある。活性化は乾燥空気中で所定温度で4時間かけて触媒にガスを通すことにより行う。これは通常はチューブ炉内で実施する。触媒はその後使用するまで窒素雰囲気下に貯蔵する。
酸化クロム触媒の還元:典型的な調製法では、先に活性化した触媒3gを不活性雰囲気で攪拌子の付いた50mLのエアレスウェアのフラスコに入れる。35mLの乾燥脱気ヘキサンを加え、該混合物を50℃に加熱する。次いで還元剤をシリンジを通して加える(試薬全体としてヘキサン中20〜25重量%である。)。記述される当量は常に試薬対クロムの比率である。30分後、乾燥を開始する。これは高真空又は窒素パージの下で行うことができる。触媒は使用するまで窒素雰囲気下に貯蔵する。
使用前にすべてのシリカを脱水する。シリカの脱水は乾燥空気又は窒素中で所定温度で4時間かけて触媒にガスを通すことにより行う。典型的な調製法では、先に脱水したシリカ3gを不活性雰囲気で攪拌子の付いた50mLのエアレスウェア(airless ware)のフラスコに入れる。35mLの乾燥脱気ヘキサンを加え、該混合物を50℃に加熱する。有機クロム源(トリフェニルシリルクロメート(TPSC))を、希釈剤の添加前、添加時又は添加後に加えることができる。該混合物は典型的には2時間攪拌する(断りのある場合、攪拌は10時間続けることができる。)。次いで還元剤をシリンジを通して加える(試薬全体としてヘキサン中20〜25重量%である。)。記述される当量は常に試薬対クロムの比率である。30分後、乾燥を開始する。これは高真空又は窒素パージの下で行うことができる。触媒は使用するまで窒素雰囲気下に貯蔵する。還元剤が添加されないときは、乾燥はクロム源及びシリカを上述のように混合した後に開始する。
使用されるときは、添加される還元剤対クロムの比を実施例中に見出すことができる。“反応器中”とは該試薬が触媒とは別個に添加されることを意味する。“触媒中”とは該試薬が触媒の調製工程で添加されることを意味する。クロムについて記載した重量%の値は近似値であり、実際の値は±50%の範囲に及び得る。このことは酸化クロム及びシリルクロメート触媒の両方に当てはまる。
1リットルの攪拌反応器を重合反応に使用した。反応器は、各実験前に窒素パージ下にて高温で完全に乾燥した。500mLの乾燥脱気ヘキサンを60℃で反応器へ供給した。使用するときは、ヘキセンはこの時点で添加する。特に断りのない限り、各実験において10mLの1−ヘキセンを使用する。次に、600℃で脱水し、0.6mmol/gのTEALで処理した少量(0.1〜0.25g)のDavison955(商品名)シリカを反応器へ添加して如何なる不純物も不動態化させる。試薬が触媒とは別個に反応器に添加される場合は、何れの実験においてもTEALで処理したシリカは加えなかった。15分間の攪拌の後に触媒を入れ、続いて追加の添加剤を入れた。助触媒は他の箇所で述べるように希釈溶液として反応器に直接添加する。反応器を密封し、水素はこの時点で入れる。水素は表に示す場合にのみ使用する。反応器はエチレンを加えて200psiとした。エチレンは反応器圧力が200psiを維持するように流す。エチレンの供給量は電子流量計で測定する。共重合はすべて85℃で行い、単独重合は90℃で行った。重合は最大160gのPEが製造されるまで行ったか又はそれより早く停止した。除圧及び温度低下の後に反応器を開けた。ポリマーの重量は希釈剤を蒸発させた後に測定した。次いでポリマーに多くの試験を行って特性を決定した。
密度:ASTM D−1505
メルトインデックス:(I2)ASTM D−2338 条件E(190℃で測定、10分当たりのグラム数で報告)
フローインデックス:(I21)ASTM D−1238 条件F(上記メルトインデックスで用いた重量の10倍で測定)
MFR:メルトフローレシオはフローインデックス/メルトインデックスである。
SEC:ポリマーラボラトリーズ(Polymer Laboratories)社;型式:HT−GPC−220,カラム:Shodex,実験温度:140℃,検定標準:NISTトレーサブル,溶媒:1,2,4−トリクロロベンゼン
BBF:13C−NMRで計測したブチル分枝頻度(この数値は炭素原子1000個当たりのブチル分枝の数である。)
表1の実施例を参照すると、記載された重合条件下にて、炭素原子1000個当たり3.8個のブチル分枝がNMR分析により観察されたことが分かる。これはポリマーへコモノマーが組み込まれた程度を示す。実施例2は触媒がTEALで処理されると、同一条件で組み込まれるヘキセンの量が僅かに減少し、一方でポリマーのフローインデックスが低下することを示している。実施例3は、触媒がTEALで処理されるとコモノマーが存在しなくても相当数の分枝が認められることを示している。この事例では、ブチル(2.4)及びエチル(1.0)分枝の両方が検出された。触媒がDEALEで処理されるとより少ないポリマー側鎖の枝分かれが検出されたが、このことはコモノマーの組み込みの低下が生じたことを示している(実施例4)。触媒還元剤がTEALとDEALEの組み合わせのときは、コモノマーの組み込み率はどちらか一方の還元剤を用いたときに認められるものの間であることが分かった(実施例5)。触媒還元剤を組合せて使用して触媒を作製して単独重合に該触媒を用いるときは、側鎖の枝分かれは検出されなかったことが実施例6から分かる。このことはDEALEがコモノマーの不在下で側鎖の枝分かれの生成を抑制したことを示す。ヘキセンの存在及び不在の両方において、DEALEの添加は生成するエチレンポリマーにおける側鎖の枝分かれを有意に減少させ、ときには排除した。
Ti−CrOx触媒は、活性化前にチタンテトライソプロポキシドが酸化クロムと一緒にシリカに含浸されることを除いて、CrOxと同一である(表1の実施例7〜9)。還元剤不在のときと比べてTEALの存在下では、CrOx触媒について見られたのと同一の分子量の傾向がTi−CrOx触媒について観察された。
また、クロムベース触媒の生産性は、DEALEのような活性剤を反応器に直接添加することにより、又は触媒の調製工程の一部として添加することにより増加させることができることも分かった。上での議論に整合することに、ポリマー分子量及び分子量分布の制御は本発明の別の一特徴である。
以下の助触媒:TEAL、TIBA(トリイソブチルアルミニウム)及びTNHAL(トリ−n−ヘキシルアルミニウム)を用いて、(5当量のDEALE/Crで処理した)SC触媒の性能に助触媒が与える効果を検討した。実施例では特定の助触媒に限定されているが、その他のアルキルアルミニウム化合物も適用でき本発明の一部であることを理解すべきである。表8及び図13〜21は、助触媒を変化させたときのポリマーのフローインデックス、活性、密度、誘導時間、及び種々の分子量関連のデータを示している。表8及び図13〜21のデータにおいて検討したベースとなる触媒系はCr1当量当たりDEALE5当量としたSC触媒である(ここではSC−500と表示する。)。表8におけるフローインデックスの傾向は助触媒の添加により分子量が増加したことを示している。また、表8は触媒活性が助触媒の添加によって増加したことも示している。TEB(トリエチルホウ素)もSC触媒用の助触媒として使えることに留意すべきである。助触媒は常に、“反応器中”(定義通り)に添加された。
更に、本発明者はアルミニウムベースではない種々の化合物も本発明に有用であることを発見した。例えば、TEB(トリエチルホウ素)は触媒の性能へ与える効果が好適であった。表11は、CrOx(Grace955シリカ担持酸化クロム)及びTi−CrOxの触媒系の性能に対するTEB助触媒の効果を示している。
以下、本発明の気相流動層による実施例を示す。公称直径14インチをもつUNIPOLTM(登録商標)プロセス設計による気相流動層重合反応器を用いて高密度エチレン−ヘキセンのコポリマーを連続に製造した。ここでの事例においては、循環ガス排風機は、ガス再循環ループ内で循環ガス熱交換器の上流に位置させたが、これら二つを逆転させてガスが熱交換器に入るところでの温度を下げることもできた。循環パイプは直径が約2インチであり、流動層内の空塔ガス速度を所望の速度に制御する循環ライン中のボールバルブによって流量を操作した。モノマー及び気体状成分は排風機前段、排風機のインペラのところ又は排風機後段の冷却器上流で加えた。乾燥触媒を、窒素キャリアガス流を用いて、離散的に少しずつ一定量を1/8インチのチューブを通して分散板から約0.1〜2m上方、もっとも好ましくは約0.2〜1.2mの範囲の高さのところで反応器の直径の約15〜50%の位置に流動層へ直接的に連続的に加えた。ポリマー生成物は、流動層を所望の平均的な高さや重量にほぼ維持するために、約0.2〜5kgの一定量ずつを排出分離タンクを通して反応器から定期的に引き抜いた。ポリマーの分子量及び分子量分布を操作するために、いくつかの実験において窒素中の酸素の希釈流(200ppmv)を入手して使用した。これは、遊離アルミニウムアルキルが反応系に存在しないときは熱交換器前段の循環ガスに加えたが、遊離TEAL及びDEALEが存在するときは酸素の一部が循環ライン又は流動層に入る前の熱交換器内でこれらアルミニウムアルキルと反応する可能性を回避するために添加地点は流動層へと変更した。これは予防策であって循環ラインや熱交換器前段へ添加することを排除するものではない。
Claims (3)
- 気相重合反応器内において重合条件下で触媒をエチレンに接触させる工程と、
アルミニウム当量対クロム当量の最終的な比率が1:1〜3:1となるような量の有機アルミニウム化合物を添加することにより、触媒活性、生成されるエチレンポリマーにおけるポリマー側鎖の枝分かれ、ポリマーM z /M w 、ポリマーM w /M n 、ポリマー密度及びポリマー分子量の一つ又はそれより多くを制御する工程と、
を含むエチレンポリマーの製造方法であって、
前記触媒は、
酸化クロムと、
(c)孔隙量が0.9〜1.4cm3/gで表面積が390〜590m2/gのシリカよりなる群から選択されるシリカを含むシリカ含有担体と、
で実質的に構成される担持されたクロム触媒であって、
前記有機アルミニウム化合物は、ジエチルアルミニウムエトキシド、ジエチルアルミニウムメトキシド、ジメチルアルミニウムエトキシド、ジ−イソプロピルアルミニウムエトキシド、ジエチルアルミニウムプロポキシド、ジ−イソブチルアルミニウムエトキシド、及びメチルエチルアルミニウムエトキシドから選択されるアルキルアルミニウムアルコキシド化合物であり、
アルキルアルミニウムアルコキシドから選択されるアルミニウム当量対クロム当量の比は1:1〜3:1であり、
前記アルキルアルミニウムアルコキシド化合物は、重合反応器中へ現場で添加し、
前記担持されたクロム触媒は、400〜860℃で活性化される、該方法。 - 前記アルキルアルミニウムアルコキシド化合物はジエチルアルミニウムエトキシドである請求項1に記載の方法。
- 前記担持されたクロム触媒が、600〜860℃で活性化される請求項1又は2に記載の方法。
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US43679002P | 2002-12-27 | 2002-12-27 | |
US60/436,790 | 2002-12-27 | ||
US10/716,291 | 2003-11-18 | ||
US10/716,291 US6989344B2 (en) | 2002-12-27 | 2003-11-18 | Supported chromium oxide catalyst for the production of broad molecular weight polyethylene |
Related Parent Applications (1)
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