CN114832772B - 一种介孔分子筛吸附剂及其制备方法 - Google Patents
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Abstract
本发明涉及一种介孔分子筛吸附剂及其制备方法,包括如下步骤:1)对带有模板剂的介孔分子筛进行表面预处理;2)在氮气氛围下对模板剂进行碳化,并以AlCl3蒸汽对其进行金属活化;3)空气氛围下对活化后的介孔分子筛进行煅烧,实现吸附力提升。该吸附剂包含质量分数为90‑99.5%的介孔氧化硅分子筛和0.5‑10%的改性氧化铝,对于芳烃具有较强的吸附能力,能够有效地吸附分离石脑油到柴油馏分段的芳烃组分,实现芳烃组分纯度大于99%,非芳烃组分纯度大于99%。
Description
背景技术
石脑油,又称化工轻油、粗汽油,是以原油或其他原料加工生产的轻质油,主要用作化工原料。因用途不同有各种不同的馏程,我国规定馏程为初馏点220℃左右,也可以根据使用需要加以调整:如70至145℃馏分为轻石脑油,多用于生产乙烯的裂解原料;70至180℃馏分的馏分为重石脑油,主要用于生产芳烃或高辛烷值汽油。石脑油是多种碳氢化合物的混合物,其中包括的烃类碳数为4~11个,主要为正构烷烃、异构烷烃、环烷烃和芳烃。不同来源的石脑油中芳烃的含量也不同,一般在1~15wt%。当作为蒸汽裂解制乙烯的原料时,芳烃组分在高温裂解时基本不变,对产率没有贡献却容易缩合生焦,不适宜做裂解原料,因此,需将石脑油中的芳烃分离。此外其它物料的精制过程中也有从烃类混合物中分离出芳烃的需要:如柴油脱芳、溶剂油精制以及催化重整后芳烃的分离。
降低石脑油至柴油馏分段中芳烃含量的有效方法之一是吸附脱除芳烃。
专利CN1261532C公开了一种脱除煤油馏分中芳烃的方法,所采用的吸附剂为二氧化硅、NaX或NaY。所用煤油馏分中含有12.3wt%的芳烃组分,在25-100℃下与所用吸附剂接触进行芳烃组分的脱除,可实现非芳组分纯度为97.2%。
专利CN1292050C公开了一种从全馏分石脑油中分离正异构烷烃的方法。首先将石脑油与极性固体吸附剂接触,吸附脱除芳烃组分,而后将吸余油通过5A分子筛吸附剂,正构烷烃被吸附在5A分子筛吸附剂上。所述极性固体吸附剂为硅胶、NaX或NaY分子筛,芳烃组分的解吸剂为碳数在8~9的脂肪醇类化合物。
上述专利文献中,虽然一定程度上实现了石脑油中芳烃分离,但仍存在芳烃吸附分离的扩散速度不高,芳烃吸附力不足的问题。
发明内容
本发明所要解决的技术问题是克服现有技术存在的介孔氧化硅材料在金属改性过程中骨架结构易被破坏,降低芳烃吸附分离的扩散速度的问题,以及介孔氧化硅分子筛缺少表面缺陷位,提高改性过程中活性金属利用率低,芳烃吸附力不足的问题;提供一种介孔分子筛吸附剂及其制备方法。
为解决上述技术问题,本发明具体通过如下技术方案予以实现:
一种介孔分子筛吸附剂,其特征在于,所述吸附剂应用于石脑油至柴油馏分段原料中芳烃的吸附分离,所述吸附剂包含质量分数为90-99.5%的介孔氧化硅分子筛和0.5-10%的改性氧化铝;
所述介孔分子筛吸附剂的制备方法包括以下步骤:
(1)表面预处理:将未脱除模板剂的介孔氧化硅分子筛与稀氨水溶液混合,水热处理、过滤、洗涤、烘干,得到表面缺陷前驱体。
(2)金属活化:在氮气气氛中,先将表面缺陷前驱体中模板剂碳化,然后与AlCl3蒸汽混合处理,得到铝改性介孔氧化硅分子筛。
(3)吸附力提升:将铝改性介孔氧化硅分子筛在空气气氛中进行程序升温焙烧,脱除碳化的模板剂,释放芳烃吸附中心,得到所述介孔分子筛吸附剂。
本发明还进一步提供了上述分离石脑油至柴油馏分段原料中芳烃组分的介孔分子筛吸附剂的制备方法,包括以下步骤:
(1)表面预处理:将未脱除模板剂的介孔氧化硅分子筛与稀氨水溶液混合,水热处理、过滤、洗涤、烘干,得到表面缺陷前驱体。
(2)金属活化:在氮气气氛中,先将表面缺陷前驱体中模板剂碳化,然后与AlCl3蒸汽混合处理,得到铝改性介孔氧化硅分子筛。
(3)吸附力提升:将铝改性介孔氧化硅分子筛在空气气氛中进行程序升温焙烧,脱除碳化的模板剂,释放芳烃吸附中心,得到所述介孔分子筛吸附剂。
在本发明吸附剂的制备方法中,步骤(1)所述稀氨水溶液中氨水质量浓度为1-5%,固液质量比为1:(10-50),水热处理温度为80-150℃,水热处理时间为6-24h。
在本发明吸附剂的制备方法中,步骤(2)所述氮气气氛温度为500-700℃,碳化时间为1-6h,铝改性处理时间为2-12h。
在本发明吸附剂的制备方法中,步骤(3)所述程序升温速度为1-10℃/min,温度为500-600℃,焙烧时间为4-12h。
本发明还进一步它提供了上述吸附剂在吸附分离柴油中多环芳烃的应用,优选应用条件:40-150℃,吸附压力0.1-1.0MPa;吸附过程中使用的解吸剂为环己烷、甲基环己烷、苯、甲苯、二甲苯、三甲苯、乙醇、甲醇中的一种或几种。
本发明杂介孔分子筛吸附剂对石脑油至柴油馏分段原料中芳烃组分具有较强的吸附能力,实现芳烃组分纯度大于99%,非芳烃组分纯度大于99%。
本发明的有益效果:通过氨水处理介孔氧化硅,产生表面缺陷,提高活性金属铝的利用率,产生有效芳烃吸附中性,并利用模板剂保护介孔氧化硅骨架结构不被破坏,通过模板剂的碳化和分解,实现芳烃吸附活性中心的保护和释放;本发明吸附剂在吸附分离石脑油至柴油馏分中芳烃的应用,获得高纯度芳烃和非芳烃产品。
具体实施方式
本发明所述吸附剂中,介孔氧化硅分子筛为MCM-41、MCM-48、KIT-1、KIT-5、KIT-6、SBA-1、SBA-2、SBA-6、SBA-11、SBA-12、SBA-15、SBA-16、IBN-9、FDU-1、FDU-2、FDU-5、FDU-12、AMS-8、AMS-10、TUD-1、HMS和MSU中至少一种。
本发明提供的吸附剂制备方法中,步骤(1)所用介孔氧化硅分子筛是按照其相应原本合成的溶胶法制备的,通常包括硅源、水、碱性化合物、有机结构导向剂等混合形成溶胶的步骤,本发明没有特殊要求。
本发明所提供的石脑油至柴油馏分段原料中芳烃组分方法,模拟原料油与吸附剂在40~150℃下接触分离,芳烃组分留在吸附剂中,采用环己烷、甲基环己烷、苯、甲苯、二甲苯、三甲苯、乙醇、甲醇中的一种或几种作为解析剂,冲洗出芳烃组分,如此反复即可从模拟原料油中吸附分离出芳烃。
下面通过实例说明该发明过程,但并非仅限于这些例子。
实施例中所用为模拟原料油,含有正己烷、十二烷、三甲基苯、萘、甲基萘、四氢萘多种化合物。芳烃组分的含量采用气相色谱法GC和色谱质谱联用仪GC-MS测定。
发明吸附石脑油至柴油馏分段中芳烃组分的评价方法如下:
将100g吸附剂装入固定床吸附柱,进行预处理,活化条件为:温度200~500℃,升温速率为5~10℃/min,在300℃保持1~3小时,在500℃保持1~4小时。活化结束后降低床层温度至40~150℃,进行石脑油至柴油馏分段中芳烃组分吸附分离实验,吸附分离条件为:温度40~150℃,压力为0.1~1MPa,模拟原料油流速为0.5~5mL/min,连续定期取样分析,用气相色谱仪和色谱-质谱联用仪分析液体产物组成。首先收集的组分芳烃含量较低,记为非芳烃组分,分析并计算得到产物芳烃含量和脱出率,当吸附柱出口发生芳烃穿透时,停止柴油进料,通入解吸剂,将柱内芳烃抽出,记为芳烃组分,分析组分中芳烃含量。
非芳烃组分收率=非芳烃组分质量/模拟产油总质量ⅹ100%
非芳烃组分中芳烃含量=非芳烃组分中芳烃质量/非芳烃组分质量ⅹ100%
芳烃组分纯度=芳烃组分中芳烃质量/芳烃组分质量x100%
实施例1
(1)表面预处理:将100g含有模板剂的MCM-41介孔氧化硅分子筛置于300g氨水质量浓度为3wt%的溶液中,在100℃下水热处理12h。处理后的介孔氧化硅分子筛经过滤、大量去离子水洗涤后,在90℃下干燥12h,得到具有表面缺陷的MCM-41介孔氧化硅分子筛。
(2)金属活化:将上述制备的具有表面缺陷的MCM-41介孔氧化硅分子筛在氮气氛围中进行模板剂碳化,碳化温度为550℃,碳化时长为3h。而后通入AlCl3蒸汽进行处理,蒸汽流速为1mL/min,处理温度为550℃,处理时长为4h,处理后得到铝改性介孔氧化硅分子筛。
(3)吸附力提升:将上述铝改性介孔氧化硅分子筛在空气气氛中进行程序升温焙烧,脱除碳化的模板剂,释放芳烃吸附中心。升温速率为3℃/min,温度为550℃,焙烧时间为8h。焙烧后得到所述介孔分子筛吸附剂。
(4)吸附剂性能评价:采用固定床吸附器,吸附剂装填100g,首先用甲基环己烷润湿吸附柱,以很顶泵速2mL/min通入模拟原料油,模拟柴油组成见表1,保持吸附柱温度在80℃左右,吸附柱压力在0.1~1.0MPa,检测吸附柱出口芳烃含量,收非芳烃组分。当出口检测到明显芳烃组分时,停止通入模拟柴油,进料换为解析剂,恒定泵速5mL/min,收集芳烃组分,分析收集样品中的芳烃含量。本实例所用解析剂为甲苯。吸附评价见表2。
实施例2
(1)表面预处理条件与实施例1相同。
(2)金属活化过程中,AlCl3蒸汽处理时长变为8h,其他条件与实施例1相同。
(3)吸附力提升条件与实施例1相同。
(4)吸附剂性能评价与实施例1相同,使用解析剂为甲基环己烷,吸附剂评价见表2.
实施例3
(1)表面预处理过程中,氨水的质量浓度为5wt%,水热处理温度为120℃,水热处理时长为15h,其他条件与实施例1相同。
(2)金属活化过程中,AlCl3蒸汽处理时长变为12h,其他条件与实施例1相同。
(3)吸附力提升条件与实施例1相同。
(4)吸附剂性能评价与实施例1相同,使用解析剂为邻二甲苯,吸附剂评价见表2。
实施例4
(1)表面预处理过程中,介孔氧化硅分子筛换为SBA-15,其它条件与实施例1相同。
(2)金属活化条件与实施例1相同。
(3)吸附力提升条件与实施例1相同。
(4)吸附剂性能评价与实施例1相同,吸附剂评价见表2。
实施例5
(1)表面预处理条件与实施例4相同。
(2)金属活化条件与实施例2相同。
(3)吸附力提升条件与实施例1相同。
(4)吸附剂性能评价与实施例2相同,吸附剂评价见表2。
实施例6
(1)表面预处理条件与实施例4相同。
(2)金属活化条件与实施例3相同。
(3)吸附力提升条件与实施例1相同。
(4)吸附剂性能评价与实施例3相同,吸附剂评价见表2。
模拟原料油组分见表1,其中非芳烃组分包括C7-C11的链烷烃和环烷烃。
表1
链烷烃,w% | 环烷烃,w% | 非芳组分,w% | 芳烃组分,w% |
56.67 | 31.43 | 88.1 | 11.9 |
从表2中可以看出,所述吸附剂均能降低模拟原料油中的芳烃组分。
表2
Claims (9)
1.一种介孔分子筛吸附剂,其特征在于,所述吸附剂应用于石脑油至柴油馏分段原料中芳烃的吸附分离,所述吸附剂包含质量分数为90-99.5%的介孔氧化硅分子筛和0.5-10%的改性氧化铝;
所述介孔分子筛吸附剂的制备方法包括以下步骤:
(1)表面预处理:将未脱除模板剂的介孔氧化硅分子筛与稀氨水溶液混合,水热处理、过滤、洗涤、烘干,得到表面缺陷前驱体;
(2)金属活化:在氮气气氛中,先将表面缺陷前驱体中模板剂碳化,然后与AlCl3蒸汽混合处理,得到铝改性介孔氧化硅分子筛;
(3)吸附力提升:将铝改性介孔氧化硅分子筛在空气气氛中进行程序升温焙烧,脱除碳化的模板剂,释放芳烃吸附中心,得到所述介孔分子筛吸附剂。
2.一种介孔分子筛芳烃吸附剂的制备方法,其特征包含以下步骤:
(1)表面预处理:将未脱除模板剂的介孔氧化硅分子筛与稀氨水溶液混合,水热处理、过滤、洗涤、烘干,得到表面缺陷前驱体;
(2)金属活化:在氮气气氛中,先将表面缺陷前驱体中模板剂碳化,然后与AlCl3蒸汽混合处理,得到铝改性介孔氧化硅分子筛;
(3)吸附力提升:将铝改性介孔氧化硅分子筛在空气气氛中进行程序升温焙烧,脱除碳化的模板剂,释放芳烃吸附中心,得到所述介孔分子筛芳烃吸附剂。
3.根据权利要求1所述的介孔分子筛吸附剂,所述介孔氧化硅分子筛为MCM-41、MCM-48、KIT-1、KIT-5、KIT-6、SBA-1、SBA-2、SBA-6、SBA-11、SBA-12、SBA-15、SBA-16、IBN-9、FDU-1、FDU-2、FDU-5、FDU-12、AMS-8、AMS-10、TUD-1、HMS和MSU中至少一种。
4.根据权利要求2所述的方法,其特征在于,步骤(1)所述稀氨水溶液中氨水质量浓度为1-5%,固液质量比为1:(10-50),水热处理温度为80-150℃,水热处理时间为6-24h。
5.根据权利要求2所述的方法,其特征在于,步骤(2)所述氮气气氛温度为500-700℃,碳化时间为1-6h,铝改性处理时间为2-12h。
6.根据权利要求2所述的方法,其特征在于,步骤(3)所述程序升温速度为1-10℃/min,温度为500-600℃,焙烧时间为4-12h。
7.一种权利要求1所述吸附剂在石脑油至柴油馏分段原料中芳烃吸附分离的应用。
8.根据权利要求7所述的应用,其特征在于,所述应用方法实现芳烃组分纯度大于99%,非芳烃组分纯度大于99%。
9.根据权利要求8所述的应用,其特征在于,吸附温度为40-150℃,吸附压力为0.1-1.0MPa,吸附过程中使用的解吸剂为环己烷、甲基环己烷、苯、甲苯、二甲苯、三甲苯、乙醇、甲醇中的一种或几种。
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