CN103787819B - 一种高纯度四环庚烷的连续制备方法 - Google Patents
一种高纯度四环庚烷的连续制备方法 Download PDFInfo
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- DGZUEIPKRRSMGK-UHFFFAOYSA-N quadricyclane Chemical compound C1C2C3C2C2C3C12 DGZUEIPKRRSMGK-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000010924 continuous production Methods 0.000 title claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 60
- 239000003054 catalyst Substances 0.000 claims abstract description 58
- 239000000463 material Substances 0.000 claims abstract description 55
- 239000002131 composite material Substances 0.000 claims abstract description 46
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 39
- 239000007787 solid Substances 0.000 claims abstract description 39
- 239000011941 photocatalyst Substances 0.000 claims abstract description 38
- 238000004939 coking Methods 0.000 claims abstract description 33
- 238000004508 fractional distillation Methods 0.000 claims abstract description 21
- 239000000376 reactant Substances 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 50
- SJYNFBVQFBRSIB-UHFFFAOYSA-N norbornadiene Chemical compound C1=CC2C=CC1C2 SJYNFBVQFBRSIB-UHFFFAOYSA-N 0.000 claims description 32
- 239000000377 silicon dioxide Substances 0.000 claims description 23
- 229910001220 stainless steel Inorganic materials 0.000 claims description 14
- 239000010935 stainless steel Substances 0.000 claims description 14
- 150000002576 ketones Chemical class 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 13
- 239000000047 product Substances 0.000 claims description 12
- 238000004821 distillation Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 7
- KWOLFJPFCHCOCG-UHFFFAOYSA-N Acetophenone Chemical compound CC(=O)C1=CC=CC=C1 KWOLFJPFCHCOCG-UHFFFAOYSA-N 0.000 claims description 6
- 239000007795 chemical reaction product Substances 0.000 claims description 6
- 125000004177 diethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 229910002367 SrTiO Inorganic materials 0.000 claims description 3
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical group C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 claims description 3
- 239000012965 benzophenone Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000003960 organic solvent Substances 0.000 claims description 3
- 230000006798 recombination Effects 0.000 claims description 3
- 238000005215 recombination Methods 0.000 claims description 3
- 238000001291 vacuum drying Methods 0.000 claims description 3
- 230000002459 sustained effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 8
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- 230000000052 comparative effect Effects 0.000 description 6
- 238000006317 isomerization reaction Methods 0.000 description 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 5
- 229910052753 mercury Inorganic materials 0.000 description 5
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
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- 150000001412 amines Chemical class 0.000 description 1
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- 238000004587 chromatography analysis Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000007699 photoisomerization reaction Methods 0.000 description 1
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Abstract
本发明公开了高纯度四环庚烷的连续制备方法,其可以采用反应-精馏集成法或先反应后精馏的方法。两种方法都使用了将有机光敏剂负载在固体光催化剂上之后所得到的新型复合催化剂,该催化剂活性高且稳定性好。在反应-精馏集成法中,将该复合催化剂与精馏填料共混使用或者覆盖在精馏填料上,以实现反应与精馏的集成。在先反应后精馏方法中,催化剂和精馏填料分开放置。两种方法都实现了相对短的反应物停留时间,且都得到了高纯度的四环庚烷,并都减少了结焦物的产生量。
Description
技术领域
本发明属于四环庚烷合成工艺领域。
背景技术
四环庚烷是重要的高能航天燃料,密度达到0.98g·cm-3、冰点低于-40℃,可应用于火箭、导弹、卫星和飞船等航天航空推进系统,与煤油燃料相比,具有高能量的优势,与肼类燃料相比,具有高安全性的优势。
四环庚烷采用光化学方法合成,以降冰片二烯为原料、紫外光照射、有机光敏剂或固体光催化剂作为反应的催化剂,通过降冰片二烯的分子内加成反应生成四环庚烷。
现有的光催化降冰片二烯异构反应一般使用高压或中压汞灯,光照产生大量的热量,需要采用对紫外光透明的石英冷却夹套来冷却。在光异构反应过程中,会发生一些副反应,主要为反应物在光诱导下聚合,形成结焦物并附着石英夹套的外表面,阻碍光的透过,使反应变慢甚至停止。此外,石英反应器的难以清洗,易碎,成本高。
美国专利US2004/0054244A1为抑制反应过程中的结焦副反应,向反应物中添加胺类抑制剂,并且设计了一个流动式的循环石英反应器,采用1300W中压汞灯,含有0.4%乙基米氏酮的反应液以1.2ml/min的流速流过,循环反应25小时后,转化率接近100%。但该专利方法中,光敏剂直接保留在四环庚烷中,不进行提纯。
德国专利DE3625006A1设计了一个旋转刷子,采用光敏剂进行反应,反应过程中定期使用刷子清除石英器壁上的结焦物。
虽然上述专利在一定程度上抑制了结焦,但仍然存在以下问题:(1)、使用的反应器均为成本较高、易碎的石英,(2)而且光敏剂残留在产物中,影响四环庚烷的纯度,(3)从反应原理来看,要完全抑制反应结焦是不可能的,因此,装置长时间反应后总会有结焦物在反应器壁生成,(4)均采用间歇反应,不利于批量制备。
为了克服上述困难,本发明旨在提供一条新的四环庚烷制备工艺,通过反应和分离提纯集成,实现了一种高纯度四环庚烷的连续制备方法。
发明内容
第一方面,本发明涉及一种高纯度四环庚烷的连续制备方法,其为反应-精馏集成方法,包括以下步骤:
a.将反应物降冰片二烯通入反应-精馏集成反应器中,该反应器外部为不锈钢筒,内部设有石英管,该石英管内设有紫外光源,石英管与不锈钢筒之间填充有精馏填料和复合催化剂,其中,该精馏填料与颗粒形式的该复合催化剂以无序形式混合在一起,或者所述精馏填料的表面覆盖有所述复合催化剂层,通入的降冰片二烯以液膜或气液混合物形式流过该复合催化剂的表面及其内部孔道,发生反应,生成包括四环庚烷和结焦物在内的反应产物;与此同时,
b.在该反应-精馏集成反应器提供的精馏作用下,降冰片二烯逐步向该反应-精馏集成反应器的顶部运动并持续反应,未反应的降冰片二烯离开该顶部,经冷凝后作为循环反应物再次进入到该反应-精馏集成反应器;产物四环庚烷和结焦物则在精馏作用下向该反应-精馏集成反应器的底部运动,并在该底部排出到蒸馏釜中进行蒸馏,蒸馏釜顶部得到纯度高于99.5%的四环庚烷,蒸馏釜底得到结焦物。
第二方面,本发明涉及一种高纯度四环庚烷的连续制备方法,其为先反应-后精馏的方法,包括以下步骤:
a.将反应物降冰片二烯通入反应器中,该反应器外部为不锈钢筒,内部设有石英管,该石英管内设有紫外光源,石英管与不锈钢筒之间填充有复合催化剂颗粒,通入的降冰片二烯以液膜形式流过该复合催化剂的表面及其内部孔道并发生反应,生成包括四环庚烷和结焦物在内的反应产物;然后,
b.所有物料进料到精馏塔,在精馏作用下,未反应的降冰片二烯作为塔顶产物离开精馏塔塔顶并作为循环反应物再次进入到前述反应器中,四环庚烷和结焦物作为塔底产物离开精馏塔;然后,
c.将前述塔底产物进料到蒸馏釜中进行蒸馏,蒸馏釜顶部得到纯度高于99.5%的四环庚烷,蒸馏釜底部得到结焦物。
在本发明的第一方面和第二方面中,所述复合催化剂包括:固体光催化剂;其选自TiO2、Ti-MCM-41、Ti-SBA-15、ZnO、WO3、Ta2O5或SrTiO3;负载在所述固体光催化剂表面或孔道上的有机光敏剂,该有机光敏剂选自二苯甲酮、苯乙酮、米氏酮、四乙基米氏酮、二乙基米氏酮;其中,有机光敏剂占所述固体光催化剂的0.5%~20%,重量百分比。
在本发明的第一方面和第二方面中,紫外光源用于提供紫外光,引发光异构化反应。石英管本身呈化学惰性且具有一定强度,用于保护紫外光源,并且石英管本身透明,可供紫外光透过。
在本发明的第一方面或第二方面中,所述反应-精馏集成反应器或所述反应器可根据需要做成可拆卸的结构,便于清洗并更换催化剂和精馏填料,或清洗并更换催化剂,以及检查和维修石英管和紫外光源。
其中第一方面所述的反应-精馏集成反应器的结构参数如下:石英管与不锈钢筒之间填充的精馏填料和复合催化剂径向厚度为1~10厘米,高度不低于100cm。当然,具体的参数可以随着待处理的物料量进行调整。
其中第一方面所述的反应-精馏集成反应器内的工艺条件如下:顶部温度90~95℃,底部温度100~105℃,压力为常压,回流比0.5~2。
其中第一方面所述的蒸馏釜内的工艺条件如下:温度60~65℃,压力90~110毫巴。本文所述的压力数值皆为表压。
其中第二方面所述的反应器内的工艺条件如下:复合催化剂径向厚度为1~10厘米,温度无特殊要求,压力为常压。
其中第二方面所述的精馏塔内的工艺条件如下:塔高度不低于100cm,顶部温度90~95℃,底部温度100~105℃,压力为常压,回流比0.5~2。
其中第二方面所述的蒸馏釜内的工艺条件如下:温度60~65℃,压力90~110毫巴。
本发明中使用的催化剂为复合型催化剂,即有机光敏剂与固体光催化剂相结合,发明人惊讶地发现,将有机光敏剂负载到所述固体光催化剂之上之后,二者之间产生了某种协同效应,能大幅度提高光催化异构化反应的效率,在反应以间歇搅拌方式进行时,可将反应时间从现有技术20小时减少至10小时以内。而且,本发明还采用了固定床的反应器结构,反应物以液膜或气液混合物形式流过复合催化剂的表面及其内部孔道,与催化剂的接触面积更大,光利用率更高,加上反应器能够利用比搅拌反应更高的温度来加速反应,由于不用考虑光源的冷却问题,可以使用功率更大的光源,使得在相同的产物收率下,能够比常规的搅拌反应大大减少反应时间。因此,本发明中,反应物的单程停留时间可以减少到40~130分钟。单程停留时间的减少,将大大减少结焦副反应,这有利于减少结焦物的产生,维持反应器的清洁以便长期稳定运行。
本发明的第一方面的一个重要的特点是采用了反应-精馏集成反应器,通过将石英管与不锈钢筒之间填充精馏填料和复合催化剂颗粒,该精馏填料和复合催化剂颗粒以无序形式混合在一起,或者所述精馏填料的表面覆盖有所述复合催化剂层,由此使得反应器亦可作为精馏塔使用,在反应过程中,沸点较低的降冰片二烯向反应器的顶部运动,并在此过程中不断反应,沸点较高的四环庚烷和结焦物则向反应器的底部运动,既实现了降冰片二烯异构化为四环庚烷的反应,又实现了降冰片二烯与反应产物四环庚烷和结焦物的在线及时分离,结焦物随时产生随时就被分离出去,这进一步确保了工艺过程的连续性和稳定性。其中,精馏填料可以选自常规的精馏填料,例如丝网波纹填料、拉西环、θ形填料、异型填料,等等。这些精馏填料一般具有比表面积大的特点,且往往为框架形空心结构,与上述复合催化剂颗粒能够以很高的空间利用率混合在一起,或者,也可以经过常规的催化剂成型技术或固定技术,将上述复合催化剂直接覆盖在所述精馏填料的表面上,然后将该精馏填料与复合催化剂装填到反应-精馏集成反应器中使用。
本发明的第二方面的特点是常规的先反应后精馏,其中复合催化剂颗粒置于反应器中,而精馏填料置于精馏塔中,二者并不共存于同一容器中。其中复合催化剂和精馏填料的具体说明与第一方面所述的复合催化剂相同。
附图说明
图1是本发明的催化剂作用下的四环庚烷收率随时间变化的图。
图2是本发明的催化剂重复使用下的四环庚烷收率随时间变化的图。
图3是对比催化剂重复使用下的四环庚烷收率随时间变化的图。
图4是本发明的第一方面的方法的工艺流程简图。
图5是本发明的第二方面的方法的工艺流程简图。
图中各附图标记含义如下:
1、降冰片二烯;2、反应-精馏集成反应器;3、蒸馏釜;4、高纯四环庚烷;5、不锈钢外壳;6、复合催化剂-填料层;7、石英管;8、紫外光源;9.降冰片二烯储罐;10.反应器;11.精馏塔;12.结焦物。
实施例
通过以下实施例来进一步说明本发明。实施例仅仅是示例性的,而非限制性的。
1.复合催化剂的制备
具体的有机光敏剂和固体光催化剂的选择和搭配如下表1中所示。具体制备过程如下:将有机光敏剂溶解于有机溶剂(例如乙醇)中配置成质量浓度20%的溶液,在100℃下干燥固体光催化剂;将含有有机光敏剂的溶液和干燥后的固体光催化剂按照有机光敏剂与固体光催化剂质量比为0.5%~20%的比例混合,搅拌24h,使有机光敏剂充分吸附在固体光催化剂上;然后,将多余溶液过滤、并在100℃下真空干燥5h(对真空度没有特殊要求),则得到本发明所述的复合催化剂。其中,由本发明的方法制备的催化剂被归入实施例中。
2.催化剂的催化活性实验
将上述各催化剂颗粒按照与降冰片二烯的重量比为2%~10%的比例加入到150ml降冰片二烯中,在氮气保护和磁力搅拌的条件下,在10~70℃下,采用400W高压汞灯照射8小时,来发生反应,定期采用色谱分析法来分析溶液组成,并计算目标产物四环庚烷的收率。不同时间下的收率如图1所示,各催化剂所对应的四环庚烷收率如表1所示。
此外,还在相同实验条件下测试了单独的有机光敏剂和单独的固体光催化剂以及有机光敏剂与固体光催化剂的简单的物理混合物的活性,这些并非由本发明的方法制备的催化剂被归入对比例中。
表1
3.催化剂活性实验结果分析
从图1可见,采用本发明的复合催化剂,四环庚烷的收率随时间呈线性增长的趋势,并能够在8小时以内就达到95%之高。
从表1中的实施例1与对比例1至对比例3之间的对比可见,在相同条件下,本发明的复合催化剂所实现的四环庚烷收率要远远高于单独的有机光敏剂、单独的固体光催化剂以及有机光敏剂与固体光催化剂的简单的物理混合物。这表明,经过本发明的方法制备的复合催化剂,在将有机光敏剂负载到固体光催化剂表面或孔道内部上的过程中,二者绝非简单的一种物质均匀地物理分散在另一种物质表面上那样的简单过程,而是二者之间发生了某种相互作用,产生了巨大的1+1>2的协同效果。对此现象,可能原因是有机光敏剂与固体光催化剂之间存在光生电荷的迁移,促进了电荷的分离并提高光生电荷用于异构反应的效率,但不排除存在其他原因,有待于今后做更多的探索。
表1中示出的本发明的实施例2至实施例11的实验结果也表明,本发明的复合催化剂,在与降冰片二烯的质量比为2%-8%的较低比例范围内,在10-70℃之间,都能实现大于90%的四环庚烷收率。这说明本发明的复合催化剂活性非常高,故可以减少催化剂的用量。
从催化活性实验条件来看,直接以反应物降冰片二烯作为介质,反应中没有使用任何溶剂,即便在这样的条件下,本发明的复合催化剂活性仍然很高,而对比例中的各催化剂则活性很差。这说明本发明的复合催化剂能够摆脱反应中对稀释溶剂的依赖,有利于提高单位体积催化剂所能处理的反应物的量。且本发明的复合催化剂为固体形式,便于分离回收并反复使用。
从图2可见,本发明的复合催化剂在重复使用五六次后,四环庚烷的收率仍较高,这说明本发明的复合催化剂活性非常稳定。这可能是因为本发明中将有机光敏剂负载在固体光催化剂上的过程中,二者通过化学作用牢固结合,致使有机光敏剂不容易流失到反应介质中所导致,当然,不排除还有发明人尚未知晓的其他原因导致了本发明的催化剂的稳定性。本发明的催化剂活性稳定性非常有利于其在工业上使用。
从图3可见,单独的有机光敏剂由于溶解在反应溶液中,无法重复利用,单独的固体光催化剂虽然能够重复利用,但活性呈不断下降的趋势,有机光敏剂与固体光催化剂的简单的物理混合物在第一次反应后的四环庚烷的收率迅速下降到固体光催化剂的水平,说明其中的有机光敏剂已经流失,这说明对比例的催化剂的活性损失较大,不适合工业上反复使用。
4.本发明的高纯度四环庚烷连续制备方法—反应‐精馏集成法
工艺流程如图4所示,将反应物降冰片二烯通入反应-精馏集成反应器中,该反应器外部为内径6cm的不锈钢筒,高度为110cm,内部设有直径3cm的石英管,该石英管内设有6kW线状高压汞灯(灯长度为103cm)作为紫外光源,石英管与不锈钢筒之间填充有表面覆盖有复合催化剂的丝网波纹填料,其中复合催化剂为负载在TiO2上的二乙基米氏酮,二乙基米氏酮的负载量为TiO2重量的0.5%,复合催化剂占填料的体积比为15%。将反应物降冰片二烯以25ml/min的流速注入反应器中,通入的降冰片二烯以极薄的液膜或气液混合物形式流过该复合催化剂的表面及其内部孔道,在催化剂的催化作用和紫外光的引发下发生异构化反应,生成包括四环庚烷和结焦物在内的反应产物;反应-精馏集成反应器内的工艺条件是,顶部温度为90-95℃,底部温度为100-105℃,压力为常压,回流比0.8。在该反应-精馏集成反应器提供的精馏作用下,未反应的降冰片二烯逐步向该反应-精馏集成反应器的顶部运动并离开该顶部,经外部冷凝器冷凝后作为循环反应物再次进入到该反应-精馏集成反应器;产物四环庚烷和结焦物则在精馏作用下向该反应-精馏集成反应器的底部运动,并在该底部排出到蒸馏釜中进行减压蒸馏,该蒸馏釜内温度为60~65℃,压力为90~110毫巴,在该蒸馏釜顶部以20ml/min的蒸出速率得到高纯四环庚烷(气相色谱分析,纯度为99.6%),蒸馏釜底得到结焦物,将结焦物排放出去。整个系统运转48小时后,四环庚烷蒸出速度和纯度保持恒定,说明反应‐精馏集成反应器内未累积明显结焦物,整个系统运行500小时后,四环庚烷蒸出速度降为18.7ml/min,产出的四环庚烷的纯度略微降低到99.5%,但这仍然能满足纯度要求。运行500小时后熄灭紫外光源结束反应,取出石英管查看,发现其仍然是高度透明的,表面上几乎看不到有结焦物存在的迹象。这说明本发明的方法确实能够连续且稳定地生产高纯度的四环庚烷,且反应时间比传统的间歇法要大大缩短。
5.本发明的高纯度四环庚烷连续制备方法—先反应后精馏法
反应器高度为80cm,石英灯管直径为3cm,不锈钢反应器内径为6cm,该石英管内设有4kW线状高压汞灯(灯长度为75cm)作为紫外光源。填充的催化剂为负载了10%二乙基米氏酮的Ti‐SBA‐15(成型为粒径2‐4mm的颗粒),用恒流泵以如下表2所示的反应物流速将原料降冰片二烯注入反应器中,反应器中工艺条件为:温度无特殊要求,压力为常压,停留时间如下表2所示,反应器流出物进料到精馏塔中,精馏塔中的工艺条件为,塔高110cm,塔径6cm,塔顶温度90~95℃,塔底温度100~105℃,压力为常压,回流比1,未反应的降冰片二烯从精馏塔塔顶蒸出,然后进入原料罐中循环回到反应器中,四环庚烷和结焦物则作为精馏塔塔底物料排放至蒸馏釜中在60~65℃和90~110毫巴下进行蒸馏,四环庚烷蒸出速度也见下表2。运转48h后,四环庚烷蒸出速度和纯度保持恒定,说明未反应器内生成明显结焦物。
用气相色谱对制备的四环庚烷进行分析,含量如下表2所示。
表2
。
Claims (2)
1.一种高纯度四环庚烷的连续制备方法,包括以下步骤:
a.将反应物降冰片二烯通入反应-精馏集成反应器中,该反应器外部为不锈钢筒,内部设有石英管,该石英管内设有紫外光源,石英管与不锈钢筒之间填充有精馏填料和复合催化剂,其中,该精馏填料与颗粒形式的该复合催化剂以无序形式混合在一起,或者所述精馏填料的表面覆盖有所述复合催化剂层,通入的降冰片二烯以液膜或气液混合物形式流过该复合催化剂的表面及其内部孔道,发生反应,生成包括四环庚烷和结焦物在内的反应产物;与此同时,
b.在该反应-精馏集成反应器提供的精馏作用下,降冰片二烯逐步向该反应-精馏集成反应器的顶部运动并持续反应,未反应的降冰片二烯离开该顶部,经冷凝后作为循环反应物再次进入到该反应-精馏集成反应器;产物四环庚烷和结焦物则在精馏作用下向该反应-精馏集成反应器的底部运动,并在该底部排出到蒸馏釜中进行蒸馏,蒸馏釜顶部得到纯度高于99.5%的四环庚烷,蒸馏釜底部得到结焦物;
其中所述复合催化剂包括:
固体光催化剂;其选自TiO2、Ti-MCM-41、Ti-SBA-15、ZnO、WO3、Ta2O5或SrTiO3;
负载在所述固体光催化剂表面或孔道上的有机光敏剂,该有机光敏剂选自二苯甲酮、苯乙酮、米氏酮、四乙基米氏酮、二乙基米氏酮;
其中,有机光敏剂占所述固体光催化剂的0.5%~20%,重量百分比;
所述复合催化剂的制备方法包括以下步骤:
A.将有机光敏剂溶解于有机溶剂中配置成质量浓度20%的溶液,在100℃下干燥固体光催化剂;将含有有机光敏剂的溶液和干燥后的固体光催化剂按照有机光敏剂与固体光催化剂质量比为0.5%~20%的比例混合,搅拌24h,使有机光敏剂充分吸附在固体光催化剂上;
B.将多余溶液过滤、并将该吸附有有机光敏剂的固体光催化剂在100℃下真空干燥5h;
其中所述反应-精馏集成反应器内的工艺条件如下:顶部温度90~95℃,底部温度100~105℃,压力为常压,回流比0.5~2;
其中所述蒸馏釜内的工艺条件如下:温度60~65℃,压力90~110毫巴,表压。
2.一种高纯度四环庚烷的连续制备方法,包括以下步骤:
a.将反应物降冰片二烯通入反应器中,该反应器外部为不锈钢筒,内部设有石英管,该石英管内设有紫外光源,石英管与不锈钢筒之间填充有复合催化剂颗粒,通入的降冰片二烯以液膜形式流过该复合催化剂的表面及其内部孔道并发生反应,生成包括四环庚烷和结焦物在内的反应产物;然后,
b.所有物料进料到精馏塔,在精馏作用下,未反应的降冰片二烯作为塔顶产物离开精馏塔塔顶并作为循环反应物再次进入到前述反应器中,四环庚烷和结焦物作为塔底产物离开精馏塔;然后,
c.将前述塔底产物进料到蒸馏釜中进行蒸馏,蒸馏釜顶部得到纯度高于99.5%的四环庚烷,蒸馏釜底部得到结焦物;
其中所述复合催化剂包括:
固体光催化剂;其选自TiO2、Ti-MCM-41、Ti-SBA-15、ZnO、WO3、Ta2O5或SrTiO3;
负载在所述固体光催化剂表面或孔道上的有机光敏剂,该有机光敏剂选自二苯甲酮、苯乙酮、米氏酮、四乙基米氏酮、二乙基米氏酮;
其中,有机光敏剂占所述固体光催化剂的0.5%~20%,重量百分比;
所述复合催化剂的制备方法包括以下步骤:
A.将有机光敏剂溶解于有机溶剂中配置成质量浓度20%的溶液,在100℃下干燥固体光催化剂;将含有有机光敏剂的溶液和干燥后的固体光催化剂按照有机光敏剂与固体光催化剂质量比为0.5%~20%的比例混合,搅拌24h,使有机光敏剂充分吸附在固体光催化剂上;
B.将多余溶液过滤、并将该吸附有有机光敏剂的固体光催化剂在100℃下真空干燥5h;其中所述反应器内的工艺条件如下:温度无特殊要求,压力为常压;
其中所述精馏塔内的工艺条件如下:塔高度不低于100cm,顶部温度90~95℃,底部温度100~105℃,压力为常压,回流比0.5~2;
其中所述蒸馏釜内的工艺条件如下:温度60~65℃,压力90~110毫巴,表压。
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