CN107413375A - 苯烷基化制备甲苯的催化剂制备方法 - Google Patents
苯烷基化制备甲苯的催化剂制备方法 Download PDFInfo
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Abstract
苯烷基化制备甲苯的催化剂制备方法,催化剂以TNU‑9、MSM‑22、BETA、HZSM‑5分子筛为前躯体,其步骤为:(1)使用浓度为0.1~1%mol/L的酸和含量为0.5%~5%硝酸盐,在反应温度为20~120℃条件下反应60~300分钟,进行改性;(2)静置,抽滤,在温度为250~900℃进行焙烧,时间为1~10小时。
Description
技术领域
本发明涉及苯烷基化制备甲苯催化剂的制备技术。
背景技术
染料、医药、农药、火炸药、助剂、香料等精细化学品的生产都离不开甲苯衍生的中间体,甲苯大量用作溶剂和高辛烷值汽油添加剂,也是有机化工的重要原料,也用于合成材料工业。由于我国资源为少油富煤的行情,所以大力发展煤化工过程中C1甲醇的产量增加,但是现阶段不能够有效而合理经济的利用C1,若能使苯系与甲醇进行烷基化反应,合成甲苯和二甲苯,从根本上解决了甲苯、二甲苯紧缺的问题。当前苯与甲醇烷基化反应文献报道最多的是ZSM系列酸性分子筛,但其存在反应温度高,催化剂容易结焦、烧结,副反应复杂,甲醇利用率低等缺点。而对于BETA分子筛催化苯和甲醇烷基化反应的研究鲜有报道。再者,国内苯与甲醇制备甲苯的专利很少,很多都是制备二甲苯的相关专利。CN 104226357A报道了调整分子筛孔道大大提高了二甲苯的选择性。ACN 102600887A报道了用氢型MSM-22分子筛负载制备步骤复杂,催化剂修饰改性剂特别昂贵。CN 104492476A报道用碱性金属改性ZSM分子筛制备甲苯的专利,不过甲苯的选择性较低。
目前工业上合成甲苯、二甲苯存在的问题:催化剂的L/B酸比例以及抗积碳、抗烧结性能是制备甲苯、二甲苯的关键。催化剂酸位减弱使反应速度和选择性降低,影响反应目标产物的选择性以及收率。催化剂孔径分布,孔道路径长短将会导致甲苯进一步反应;副产物使催化剂表面堵塞而导致催化剂失活,严重影响甲苯、二甲苯的产品收率和质量。
因此,面对现有工业催化剂反应温度要求较高、容易结焦、反应停留时间较长等不利因素,对症下药,本发明催化剂有以下优点:催化剂制备步骤容易,抗烧结,能够延长反应时间,反应条件温和;催化体系环境友好,几乎没有副产品,提高产品质量,具有广泛的工业应用前景。
发明内容
本发明的目的是提供一种苯烷基化制备甲苯的催化剂制备方法。
本发明是苯烷基化制备甲苯的催化剂制备方法,催化剂以TNU-9、MSM-22、BETA、HZSM-5分子筛为前躯体,其步骤为:
(1)使用浓度为0.1~1%mol/L的酸和含量为0.5%~5%硝酸盐,在反应温度为20~120℃条件下反应60~300分钟,进行改性;
(2)静置,抽滤,在温度为250~900℃进行焙烧,时间为1~10 小时。
本发明的有益之处是:本发明涉及苯-甲醇选择烷基化过程是将苯和甲醇选择性烷基化生成甲苯、二甲苯的工艺过程。采用的工艺条件一般如下:苯/甲醇摩尔比1:1~8:1,反应压力为常压~2Mpa,反应温度为300℃~500℃, WHSV=1~8h-1。获得反应考评数据选择最佳修饰的酸和助剂,可以显著提高催化剂活性和甲苯的选择性,并延长了催化剂的使用时间,提高催化剂地稳定性和抗烧结,得到技术上可行而有效地实施效果。本发明解决了苯-甲醇烷基化反应中催化剂容易结焦、烧结、催化剂反应寿命短的问题。以便有效地利用过剩资源苯、甲醇反应得到价值更高地化工产品,减轻环境负担。
附图说明
图1实施例10得到的改性BETA分子筛催化剂XRD谱图,图2实施例10得到的改性BETA分子筛催化剂BET谱图。
具体实施方式
本发明是苯烷基化制备甲苯的催化剂制备方法,催化剂以TNU-9、MSM-22、BETA、HZSM-5分子筛为前躯体,其步骤为:
(1)使用浓度为0.1~1%mol/L的酸和含量为0.5%~5%硝酸盐,在反应温度为20~120℃条件下反应60~300分钟,进行改性;
(2)静置,抽滤,在温度为250~900℃进行焙烧,时间为1~10 小时。
以上所述分子筛是TNU-9,或者MSM-22,或者BETA 型,或者HZSM-5型分子筛中的一种。
以上所述所用有机酸为氢氟酸,或者醋酸,或者柠檬酸,或者乙二酸。
以上所述的所用助剂硝酸盐为硝酸铈,或者硝酸钕,或者硝酸铱。
以上所述含铵盐溶液为 NH4Cl,或者(NH4)2NO3,或者(NH4)2CO3溶液。
以上所述可溶性铵盐为 NH4Cl,或者(NH4)2NO3,或者(NH4)2CO3中的一种或几种。
以上所述硝酸铈、硝酸钕、硝酸铱含量均为0.5%~5%。
以上所述一种修饰烷基化的催化剂的制备,助剂硝酸盐为硝酸铈、硝酸钕、硝酸铱。
实施例1:
取焙烧TNU-9分子筛前躯体10g,缓慢滴加一定浓度的氢氟酸、醋酸、柠檬酸、乙二酸改性后静置30min,然后经过滤,并在120℃干燥,取出研磨,在温度为500℃下焙烧得到准烷基化催化剂。取一定量的准烷基化催化剂加入含有铈盐溶液打浆,再加入含氯化铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂A-1、A-2、A-3、A-4。
实施例2:
取焙烧TNU-9分子筛前躯体10g,缓慢滴加一定浓度的氢氟酸、醋酸、柠檬酸、乙二酸改性后静置30min,然后经过滤,并在120℃干燥,取出研磨,在温度为500℃下焙烧得到准烷基化催化剂。取一定量的准烷基化催化剂加入含有钕盐溶液打浆,再加入含硝酸铵溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂A-5、A-6、 A-7、A-8。
实施例3:
取焙烧TNU-9分子筛前躯体10g,缓慢滴加一定浓度的氢氟酸、醋酸、柠檬酸、乙二酸改性后静置30min,然后经过滤,并在120℃干燥,取出研磨,在温度为500℃下焙烧得到准烷基化催化剂。取一定量的准烷基化催化剂加入含有铱盐溶液打浆,再加入含碳酸铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂A-9、 A-10、A-11、A-12。
实施例4:
取焙烧MSM-22分子筛前躯体10g,缓慢滴加一定浓度的氢氟酸、醋酸、柠檬酸、乙二酸改性后静置30min,然后经过滤,并在120℃干燥,取出研磨,在温度为500℃下焙烧得到准烷基化催化剂。取一定量的准烷基化催化剂加入含有铈盐溶液打浆,再加入含氯化铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂B-1、B-2、B-3、B-4。
实施例5:
取焙烧MSM-22分子筛前躯体10g,缓慢滴加一定浓度的氢氟酸、醋酸、柠檬酸、乙二酸改性后静置30min,然后经过滤,并在120℃干燥,取出研磨,在温度为500℃下焙烧得到准烷基化催化剂。取一定量的准烷基化催化剂加入含有钕盐溶液打浆,再加入含硝酸铵溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂B-5、B-6、B-7、B-8。
实施例6:
取焙烧MSM-22分子筛前躯体10g,缓慢滴加一定浓度的氢氟酸、醋酸、柠檬酸、乙二酸改性后静置30min,然后经过滤,并在120℃干燥,取出研磨,在温度为500℃下焙烧得到准烷基化催化剂。取一定量的准烷基化催化剂加入含有铱盐溶液打浆,再加入含碳酸铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂B-9、B-10、B-11、B-12。
实施例7:
取焙烧ZSM-5分子筛前躯体10g,缓慢滴加一定浓度的氢氟酸、醋酸、柠檬酸改性后静置30min,然后经过滤,并在120℃干燥,取出研磨,在温度为500℃下焙烧得到准烷基化催化剂。取一定量的准烷基化催化剂加入含有铈盐溶液打浆,再加入含碳酸铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂C-1、C-2、C-3。
实施例8:
取焙烧ZSM-5分子筛前躯体10g,缓慢滴加一定浓度的氢氟酸、醋酸、柠檬酸改性后静置30min,然后经过滤,并在120℃干燥,取出研磨,在温度为500℃下焙烧得到准烷基化催化剂。取一定量的准烷基化催化剂加入含有钕盐溶液打浆,再加入含碳酸铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂C-4、C-5、C-6。
实施例9:
取焙烧ZSM-5分子筛前躯体10g,缓慢滴加一定浓度的氢氟酸、醋酸、柠檬酸改性后静置30min,然后经过滤,并在120℃干燥,取出研磨,在温度为500℃下焙烧得到准烷基化催化剂。取一定量的准烷基化催化剂加入含有铱盐溶液打浆,再加入含碳酸铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂C-7、C-8、C-9。
实施例10:
取焙烧BETA分子筛前躯体10g,缓慢滴加一定浓度的氢氟酸、醋酸、柠檬酸改性后静置30min,然后经过滤,并在120℃干燥,取出研磨,在温度为500℃下焙烧得到准烷基化催化剂。取一定量的准烷基化催化剂加入含有铈盐溶液打浆,再加入含碳酸铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂D-1、D-2、D-3。
实施例11:
取焙烧BETA分子筛前躯体10g,缓慢滴加一定浓度的氢氟酸、醋酸、柠檬酸改性后静置30min,然后经过滤,并在120℃干燥,取出研磨,在温度为500℃下焙烧得到准烷基化催化剂。取一定量的准烷基化催化剂加入含有铱盐溶液打浆,再加入含碳酸铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂D-4、D-5、D-6。
实施例12:
取焙烧BETA分子筛前躯体10g,缓慢滴加一定浓度的氢氟酸、醋酸、柠檬酸改性后静置30min,然后经过滤,并在120℃干燥,取出研磨,在温度为500℃下焙烧得到准烷基化催化剂。取一定量的准烷基化催化剂加入含有铱盐溶液打浆,再加入含碳酸铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂D-7、D-8、D-9。
对比例13:
取焙烧ZSM-5分子筛前躯体10g,取一定量的准烷基化催化剂加入含有铈盐溶液打浆,再加入含碳酸铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂C-1-1、C-2-1、C-3-1。
对比例14:
取焙烧ZSM-5分子筛前躯体10g,取一定量的准烷基化催化剂加入含有钕盐溶液打浆,再加入含碳酸铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂C-4-1、C-5-1、C-6-1。
对比例15:
取焙烧ZSM-5分子筛前躯体10g,取一定量的准烷基化催化剂加入含有铱盐溶液打浆,再加入含碳酸铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂C-7-1、C-8-1、C-9-1。
对比例16:
取焙烧BETA分子筛前躯体10g,取一定量的准烷基化催化剂加入含有铈盐溶液打浆,再加入含碳酸铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂D-1-1、D-2-1、D-3-1。
对比例17:
取焙烧BETA分子筛前躯体10g,取一定量的准烷基化催化剂加入含有铱盐溶液打浆,再加入含碳酸铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂D-4-1、D-5-1、D-6-1。
对比例18:
取焙烧BETA分子筛前躯体10g,取一定量的准烷基化催化剂加入含有铱盐溶液打浆,再加入含碳酸铵盐溶液打浆,静置30min,静止,干燥,研磨,焙烧得到用于烷基化制备甲苯催化剂D-7-1、D-8-1、D-9-1。
将催化剂A-1~D-9-1在固定床反应器上评价催化剂活性以及甲苯、二甲苯选择性。苯/甲醇摩尔比1:1~8:1,反应压力为常压~2Mpa,反应温度为300℃~500℃, WHSV=1~8h-1条件下进行苯-甲醇烷基化实验考评:实验数据见表1、表2。
表1 A-1~ B-12催化剂的活性评价实验数据
表2 C-1~ D-9-1催化剂的活性评价实验数据
从表1、表2中A-1~D-9-1催化剂的评价实验结果数据可见采用修饰改性分子筛催化剂,可以显著提高催化剂的活性,特别是甲苯的选择性,特别在表2中列出对比例的实验数据,可见该方法能够延长催化剂的反应时间和增强催化剂的抗烧结性能。本发明取得了理想的技术实施效果,具有较好的工业应用价值。
以上所述是本发明的实施方式的举例,特此说明在不脱离本发明技术原理的前提条件下,还可以做出若干改进和变型。
Claims (7)
1.苯烷基化制备甲苯的催化剂制备方法,其特征在于催化剂以TNU-9、MSM-22、BETA、HZSM-5分子筛为前躯体,其步骤为:
(1)使用浓度为0.1~1%mol/L的酸和含量为0.5%~5%硝酸盐,在反应温度为20~120℃条件下反应60~300分钟,进行改性;
(2)静置,抽滤,在温度为250~900℃进行焙烧,时间为1~10 小时。
2.根据权利要求1 所述的苯烷基化制备甲苯的催化剂制备方法,其特征在于分子筛是TNU-9,或者MSM-22,或者BETA 型,或者HZSM-5型分子筛中的一种。
3.根据权利要求1 所述的苯烷基化制备甲苯的催化剂制备方法,其特征在于所用有机酸为氢氟酸,或者醋酸,或者柠檬酸,或者乙二酸。
4.根据权利要求1 所述的苯烷基化制备甲苯的催化剂制备方法,其特征在于所用助剂硝酸盐为硝酸铈,或者硝酸钕,或者硝酸铱。
5.根据权利要求1 所述的苯烷基化制备甲苯的催化剂制备方法,其特征在于含铵盐溶液为 NH4Cl,或者(NH4)2NO3,或者(NH4)2CO3溶液。
6.根据权利要求4所述的苯烷基化制备甲苯的催化剂制备方法,其特征在于可溶性铵盐为 NH4Cl,或者(NH4)2NO3,或者(NH4)2CO3中的一种或几种。
7.根据权利要求1 所述的苯烷基化制备甲苯的催化剂制备方法,其特征在于硝酸铈、硝酸钕、硝酸铱含量均为0.5%~5%。
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