CN111072724A - 一种双核占吨桥连胺基-吡啶钯催化剂及其制备方法与应用 - Google Patents
一种双核占吨桥连胺基-吡啶钯催化剂及其制备方法与应用 Download PDFInfo
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- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910052763 palladium Inorganic materials 0.000 title claims abstract description 31
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 42
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- C07F15/00—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table
- C07F15/0006—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table compounds of the platinum group
- C07F15/006—Palladium compounds
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- B01J31/1805—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing nitrogen
- B01J31/181—Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine
- B01J31/1815—Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine with more than one complexing nitrogen atom, e.g. bipyridyl, 2-aminopyridine
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Abstract
本发明公开了一种双核占吨桥连胺基‑吡啶钯催化剂及其制备方法与应用,包括如下步骤:将双胺化合物A与醛化合物B在有机酸催化下,在有机溶剂中加热回流反应,形成配体C;将得到的配体C与三甲基铝在有机酸催化下,在有机溶剂中加热回流反应,形成配体D;室温下将得到的配体D与(COD)PdMeCl化合物在有机溶剂中反应得到式(Ⅰ)所示结构的双核占吨桥连胺基‑吡啶钯催化剂。本发明催化剂应用于烯烃聚合反应当中,能够完美替代MAO催化剂,不但降低了工艺成本,而且因为无需添加MAO,所以反应条件温和,不需要在苛刻的无水无氧条件下进行,极大地降低了工艺难度,具备极好的市场应用前景。
Description
技术领域
本发明属于润滑油技术领域,具体涉及一种双核占吨桥连胺基-吡啶钯催化剂及其制备方法与应用,该催化剂用于催化α-烯烃聚合来制备PAO润滑油基础油。
背景技术
近年来,随着汽车工业、机械工业的发展、国际石油危机以及带来的冲击,在国外,矿物基础油年平均增长率仅为2%,而合成基础油的年平均增长速度可达10%,并且合成基础油在使用环境苛刻时更能体现其优异性能。作为润滑油重要组成部分,润滑油基础油在市场上有巨大的需求量。聚α-烯烃(PAO)是一类应用广泛的合成润滑油基础油,应用于齿轮油、液压油、内燃机油、空气压缩机油、冷冻机油和润脂油等基础油方面。
目前国内PAO生产商(韩雪梅,高宇新,曹婷婷,等.聚α-烯烃润滑油的工艺技术进展[J].炼油与化工,2011,22(3):1-3.)主要是以蜡裂解-烯烃为原料,其组分比较复杂,含有较多的内烯烃、双烯烃、烷烃、环烷烃和芳烃杂质。
使用茂金属(MAO)催化α-烯烃聚合(邵怀启,李会,林吉超,等.聚α-烯烃合成润滑油催化剂的技术进展[J].精细石油化工进展,2014,15(4):51-55.)制备润滑基础油,使用MAO催化剂得到的润滑油综合性能优异,但是其也存在两个弊端:1、助催化剂MAO成本较高;2、MAO极易与空气中的水反应,因此,该低聚反应条件极为苛刻,工艺难度非常大。
发明内容
发明目的:为了克服现有技术中存在的不足,提供一种双核占吨桥连胺基-吡啶钯催化剂,该催化剂能够替代MAO催化剂催化α-烯烃聚合来制备PAO润滑油基础油。
技术方案:为实现上述目的,本发明提供一种双核占吨桥连胺基-吡啶钯催化剂,所述催化剂的结构式为:
其中,R是甲基或者异丙基。
一种双核占吨桥连胺基-吡啶钯催化剂的制备方法,包括如下步骤:
S1:将摩尔比为1:6~7双胺化合物A与醛化合物B在有机酸催化下,在有机溶剂中加热回流反应12h-24h,形成配体C;
S2:将得到的摩尔比为1:6的配体C与三甲基铝在有机酸催化下,在有机溶剂中加热回流反应5h-10h,形成配体D;
S3:室温下将摩尔比为1:2得到的配体D与(COD)PdMeCl化合物在有机溶剂中反应得到式(Ⅰ)所示结构的双核占吨桥连胺基-吡啶钯催化剂。
进一步的,所述步骤S1和步骤S2中的有机酸为甲酸、乙酸、对甲基苯磺酸和樟脑磺酸中的一种。
进一步的,所述步骤S1、S2和S3中的有机溶剂为甲苯、二甲苯、氯苯、四氢呋喃、二氯甲烷中的一种或几种混合。
进一步的,所述步骤S3中的(COD)PdMeCl化合物的COD=1,5-环辛二烯。
进一步的,所述步骤S1中双胺化合物A与醛化合物B形成配体C的反应式如下:
其中,R是甲基或者异丙基。
进一步的,所述步骤S2中配体C与三甲基铝形成配体D的反应式如下:
其中,R是甲基或者异丙基。
进一步的,所述式(I)的催化剂用于催化C6-C12的α-烯烃进行低聚反应及其混合物合成润滑油基础油。
进一步的,所述催化剂催化α-烯烃进行低聚反应的方法为:向聚合瓶中加入催化剂和溶剂并搅拌均匀,加热,加入α-烯烃,在快速搅拌下反应,反应结束后,蒸发溶剂,浓缩得到油状聚合物。
所述催化剂与α-烯烃之比为:1:1000~1:10000;所述反应温度为:-20~70℃;所述反应时间为:0.1h-2h;所述反应压力为:1-5atm。
进一步的,所述油状聚合物经加氢精制后,减压蒸馏轻组分,得到PAO润滑油。
有益效果:本发明与现有技术相比,具备如下优点:
1、本发明以占吨为骨架,连接一个苯胺与吡啶基团组成胺体系,最后再配位钯金属,使其具有较高的催化活性,将该催化剂应用于烯烃聚合反应当中,该催化体系得到的聚合物具有低分子量、窄的相对分子量分布,较低的倾点以及较高的粘度,使得经过聚合物得到的PAO润滑油基础油具有倾点低、粘温性能好、粘度指数高、低温性能优良、氧化安定性良好等优势,这些理化性能指标的提高,大幅提升了PAO润滑油的性能。
2、本发明催化剂应用于烯烃聚合反应当中,能够完美替代MAO催化剂,不但降低了工艺成本,而且因为无需添加MAO,所以反应条件温和,不需要在苛刻的无水无氧条件下进行,极大地降低了工艺难度。
具体实施方式
下面结合具体实施例,进一步阐明本发明。
实施例1:
本实施例是来制备双核占吨桥连胺基-吡啶钯催化剂,这里记为催化剂Pd-A,催化剂Pd-A为9,9-二甲基-9-占吨-4,4′-双[2-(2,6-二异丙基)苯胺-2-乙基]吡啶钯配合物的合成,其具体的制备过程如下:
S1:取适量的9,9-二甲基-9-占吨-4,4′-双(2,6-二异丙基)苯胺(1.0g,1.79mmol),2-吡啶甲醛(1.30g,12.1mmol)以及0.05当量的对甲苯磺酸,溶于甲苯(30mL)后,回流24h,期间通过点板来监控反应程度。反应结束后,旋干溶剂至约10ml,加入20ml甲醇进行重结晶,混合物在–20℃为黄色固体,过滤,真空干燥得到9,9-二甲基-9-占吨-4,4′-双[2-(2,6-二异丙基)苯亚胺]吡啶,产率为90%(1.21g)。
S2:取9,9-二甲基-9-占吨-4,4′-双[2-(2,6-二异丙基)苯亚胺]吡啶(1.47g,2mmol),三甲基铝(12mmol)以及0.1个当量的对甲基苯磺酸,溶于甲苯(25mL)。在N2气氛保护下回流5h后,反应停止后,加入1N冰NaOH溶液。用饱和NaCl溶液洗涤有机层两次,Na2SO4干燥,旋干溶剂,之后加入大量正己烷,过滤,所得白色固体使用正己烷反复洗涤3次,真空干燥后即得9,9-二甲基-9-占吨-4,4′-双[2-(2,6-二异丙基)苯胺-2-乙基]吡啶,产率为89%(1.36g)。
步骤S1到步骤S2的具体反应式为:
S3:取(COD)PdMeCl(0.15g,0.54mmol)和9,9-二甲基-9-占吨-4,4′-双[2-(2,6-二异丙基)苯胺-2-乙基]吡啶(0.20g,0.27mmol)加入Schlenk烧瓶中,其中COD=1,5-环辛二烯,向烧瓶中加入CH2Cl2(20mL),将混合物在室温下搅拌12小时,过滤产生的悬浮液,旋干溶剂,所得粉末用乙醚(2×10mL)洗涤,然后在室温下真空干燥得到白色固体粉末,即为催化剂Pd-A(0.26g,产率74%)。
催化剂Pd-A的结构式如下:
实施例2:
本实施例是来制备双核占吨桥连胺基-吡啶钯催化剂,这里记为催化剂Pd-B,催化剂Pd-B为9,9-二甲基-9-占吨-4,4′-双[2-(2,6-二甲基)苯胺-2-乙基]吡啶钯配合物的合成,其具体的制备过程如下:
S1:取适量的9,9-二甲基-9-占吨-4,4′-双(2,6-二甲基)苯胺(1.0g,2.23mmol),2-吡啶甲醛(1.30g,12.1mmol)以及0.05当量的对甲苯磺酸,溶于甲苯(30mL)后,回流12h,期间通过点板来监控反应程度。反应结束后,旋干溶剂至约10ml,加入20ml甲醇进行重结晶,混合物在–20℃为黄色固体,过滤,真空干燥得到9,9-二甲基-9-占吨-4,4′-双[2-(2,6-二甲基)苯亚胺]吡啶,产率为90%(1.21g)。
S2:取9,9-二甲基-9-占吨-4,4′-双[2-(2,6-二甲基)苯亚胺]吡啶(1.20g,2mmol),三甲基铝(12mmol)以及0.1个当量的对甲基苯磺酸,溶于甲苯(25mL)。在N2气氛保护下回流5h后,反应停止后,加入1N冰NaOH溶液。用饱和NaCl溶液洗涤有机层两次,Na2SO4干燥,旋干溶剂,之后加入大量正己烷,过滤,所得白色固体使用正己烷反复洗涤3次,真空干燥后即得9,9-二甲基-9-占吨-4,4′-双[2-(2,6-二甲基)苯胺-2-乙基]吡啶,产率为84%(1.01g)。
步骤S1到步骤S2的具体反应式为:
S3:取(COD)PdMeCl(0.14g,0.50mmol)和9,9-二甲基-9-占吨-4,4′-双[2-(2,6-二甲基)苯胺-2-乙基]吡啶(0.17g,0.27mmol)加入Schlenk烧瓶中,其中COD=1,5-环辛二烯,向烧瓶中加入CH2Cl2(21mL),将混合物在室温下搅拌10小时,过滤产生的悬浮液,旋干溶剂,所得粉末用乙醚(2×10mL)洗涤,然后在室温下真空干燥得到白色固体粉末,即为催化剂Pd-B(0.29g,产率82%)。
催化剂Pd-B的结构式如下:
实施例3:
本实施例中利用实施例1获得的催化剂Pd-A用于1-己烯的低聚反应,其具体过程为:向250mL聚合瓶中加入5μmol催化剂Pd-A,20mL甲苯和磁力搅拌子,将其置于低温0℃反应环境中,通过注射器迅速加入干燥的反应原料1-己烯(10ml),压力5atm,聚合25min,结束反应,加入甲醇终止反应,旋蒸脱溶剂,得到油状聚合物A。
实施例4:
本实施例中利用实施例1获得的催化剂Pd-A用于1-辛烯的低聚反应,其具体过程为:向250mL聚合瓶中加入5μmol催化剂Pd-A,20mL甲苯和磁力搅拌子,将其置于低温20℃反应环境中,通过注射器迅速加入干燥的反应原料1-辛烯(10ml),压力3atm,聚合60min,结束反应,加入甲醇终止反应,旋蒸脱溶剂,得到油状聚合物B。
实施例5:
本实施例中利用实施例2获得的催化剂Pd-B用于1-癸烯的低聚反应,其具体过程为:向250mL聚合瓶中加入5μmol催化剂Pd-B,20mL甲苯和磁力搅拌子,将其置于温度为50℃反应环境中,通过注射器迅速加入干燥的反应原料1-癸烯(10ml),压力1atm,聚合20min,结束反应,加入甲醇终止反应,旋蒸脱溶剂,得到油状聚合物C。
实施例6:
本实施例中利用实施例2获得的催化剂Pd-B用于α-12烯的低聚反应,其具体过程为:向250mL聚合瓶中加入5μmol催化剂Pd-B,20mL甲苯和磁力搅拌子,将其置于温度为70℃反应环境中,通过注射器迅速加入干燥的反应原料α-12烯(10ml),压力1atm,聚合120min,结束反应,加入甲醇终止反应,旋蒸脱溶剂,得到油状聚合物D。
实施例7:
本实施例中使用固定床反应器分别对实施例5到8得到的油状聚合物A~D进行加氢精制,反应压力为1.5MPa,反应温度为180℃,所用的加氢催化剂为常规加氢精制催化剂,得到的产物通过减压蒸馏去除轻组分,即得PAO基础油A~D。
本实施例中还通过传统的MAO催化1-辛烯得到的低聚合物E,利用低聚合物E得到PAO基础油E。
本实施例中对PAO基础油A~E的理化性能进行测定,下表1是PAO基础油A~E的理化性能指标。
表1润滑油基础油理化性能
运动粘度根据国家标准GB/T265-88采用专用毛细管粘度计测定。粘度指数则根据测得的粘度按国家标准GB/T1995-1998查表根据公式VI=[(L-U)/(L-H)]×100计算得到,式中:L-与试样100℃运动粘度相同,粘度指数为0的油品在40℃时的运动粘度,mm2/s;H-与试样100℃时的运动粘度相同,粘度指数为100的油品在40℃时的运动粘度,mm2/s;U-试样40℃时的运动粘度,mm2/s。倾点按照国家标准GB/T3535-2006进行测定。闪点按照GB/T3635-2008《石油产品闪点和燃点的测定克利夫兰开口杯法》进行测定。氧化诱导期(RBOT)按照国家石油化工行业标准SH/T0193-2008采用旋转氧弹法进行测定。
根据表1可知,PAO基础油A~D与PAO基础油E相比,PAO基础油A~D倾点更低、粘度指数更高、闪点更高,因此,PAO基础油A~D在完全不使用MAO催化剂的情况下,反而较PAO基础油E,各方面的性能有所提升。
Claims (10)
2.根据权利要求1所述的一种双核占吨桥连胺基-吡啶钯催化剂的制备方法,其特征在于:包括如下步骤:
S1:将双胺化合物A与醛化合物B在有机酸催化下,在有机溶剂中加热回流反应,形成配体C;
S2:将得到的配体C与三甲基铝在有机酸催化下,在有机溶剂中加热回流反应,形成配体D;
S3:室温下将得到的配体D与(COD)PdMeCl化合物在有机溶剂中反应得到式(Ⅰ)所示结构的双核占吨桥连胺基-吡啶钯催化剂。
3.根据权利要求2所述的一种双核占吨桥连胺基-吡啶钯催化剂的制备方法,其特征在于:所述步骤S1和步骤S2中的有机酸为甲酸、乙酸、对甲基苯磺酸和樟脑磺酸中的一种。
4.根据权利要求2所述的一种双核占吨桥连胺基-吡啶钯催化剂的制备方法,其特征在于:所述步骤S1、S2和S3中的有机溶剂为甲苯、二甲苯、氯苯、四氢呋喃、二氯甲烷中的一种或几种混合。
5.根据权利要求2所述的一种双核占吨桥连胺基-吡啶钯催化剂的制备方法,其特征在于:所述步骤S3中的(COD)PdMeCl化合物的COD=1,5-环辛二烯。
8.根据权利要求1所述的一种双核占吨桥连胺基-吡啶钯催化剂的应用,其特征在于:所述式(I)的催化剂用于催化α-烯烃进行低聚反应及其混合物合成润滑油基础油。
9.根据权利要求8所述的一种双核占吨桥连胺基-吡啶钯催化剂的应用,其特征在于:所述催化剂催化α-烯烃进行低聚反应的方法为:向聚合瓶中加入催化剂和溶剂并搅拌均匀,加热,加入α-烯烃,在快速搅拌下反应,反应结束后,蒸发溶剂,浓缩得到油状聚合物。
10.根据权利要求9所述的一种双核占吨桥连胺基-吡啶钯催化剂的应用,其特征在于:所述油状聚合物经加氢精制后,减压蒸馏轻组分,得到PAO润滑油。
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