CN114522737B - 一种高选择性制备3-乙酰氧基丙醇的方法 - Google Patents
一种高选择性制备3-乙酰氧基丙醇的方法 Download PDFInfo
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- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 239000012263 liquid product Substances 0.000 description 2
- DNIAPMSPPWPWGF-UHFFFAOYSA-N monopropylene glycol Natural products CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 2
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- 229910014460 Ca-Fe Inorganic materials 0.000 description 1
- 229910002554 Fe(NO3)3·9H2O Inorganic materials 0.000 description 1
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Abstract
本发明涉及一种高选择性制备3‑乙酰氧基丙醇的方法,所述方法以3‑乙酰氧基丙醛为原料,在加氢催化剂作用下,高选择性合成3‑乙酰氧基丙醇。所述加氢催化剂,其主要组分为金属活性组分、金属助剂Ca、选择性改进剂以及经过碱处理的载体材料。本发明方法反应工艺简单易行,适用于大规模工业化生产,反应活性和选择性优异,反应稳定性良好;加氢催化剂采用经过碱处理的载体材料,有效提高加氢反应目标产物3‑乙酰氧基丙醇的选择性。
Description
技术领域
本发明涉及一种高选择性制备3-乙酰氧基丙醇的方法,属于多相催化技术领域。
背景技术
醋酸乙烯酯经氢甲酰化和加氢反应制备1,3-丙二醇是一个重要的反应路线,因为这一路线对于商业上重要的产品合成具有广泛的用途。醋酸乙烯酯氢甲酰化得到的产物2-乙酰氧基丙醛和3-乙酰氧基丙醛是生产1,2-丙二醇和1,3-丙二醇的中间体。1,2-丙二醇在医药和食品工业中用作传热流体和防冻剂,在许多化工过程中也被用作溶剂。而1,3-丙二醇在聚氨酯、胶粘剂和树脂工业中是一种很有价值的化学品。乳酸是一种食品原料,可以由醋酸乙烯氢甲酰化得到的2-乙酰氧基丙醛经氧化水解后得到。3-乙酰氧基丙醛经加氢反应可生成3-乙酰氧基丙醇,在反应过程中,反应底物中因醛基和酯基同时存在,在加氢反应过程容易发生酯加氢、醇醛缩合等副反应。因此,如何研发高效的加氢催化剂,使3-乙酰氧基丙醛经过加氢反应高选择性制备3-乙酰氧基丙醇,是3-乙酰氧基丙醛加氢反应领域的研究重点。
发明内容
为了解决上述问题,本发明的目的在于提供一种高选择性制备3-乙酰氧基丙醇的方法,所述反应以3-乙酰氧基丙醛为原料,在加氢催化剂的作用下,高选择性合成3-乙酰氧基丙醇。
为此,本发明方法提供一种高选择性制备3-乙酰氧基丙醇的方法,以3-乙酰氧基丙醛和氢气为原料,在加氢催化剂作用下,高选择性合成3-乙酰氧基丙醇。所述加氢催化剂,其主要组分为金属活性组分、金属助剂Ca、选择性改进剂以及经过碱处理的载体材料。
在一个实施方案中,所述加氢催化剂主要组分为金属活性组分、金属助剂Ca、选择性改进剂以及经过碱处理的载体材料,金属活性组分选自Ni、Cu金属元素中的一种,选择性改进剂选自K、Fe、Sr金属元素中的一种,所述经过碱处理的载体材料选自经过碱处理的氧化铝、活性炭、二氧化硅、硅藻土中的一种。
在一个实施方案中,所述加氢催化剂中金属活性组分Ni/Cu、金属助剂Ca的质量含量分别为40%-70%、2%-10%,选择性改进剂质量含量为0.1%-5%,其余质量为载体。
在一个实施方案中,所述加氢催化剂中选用的碱处理载体材料,是指使用含有碱性物质高温处理载体材料。碱处理具体步骤为:1)50-500℃,碱性溶液中加入一定量载体材料,搅拌处理4-48h;2)搅拌后过滤,滤饼用乙醇和去离子水依次洗涤2-4次,洗涤后滤饼放入烘箱80-200℃烘干4-48h,即得到经过碱处理的载体材料。其中,碱处理载体材料步骤1)中:碱性溶液选自氢氧化钠水溶液、氢氧化钾水溶液、氨水水溶液、三乙胺乙醇溶液、乙醇胺乙醇溶液、三丙胺乙醇溶液中的一种或几种;碱性溶液溶度为0.1-2mol/L;碱性溶液中碱性物质和载体材料摩尔比为1:5-1:500。
在一个实施方案中,首先进行加氢催化剂还原、然后进行加氢反应,所述反应条件为:还原温度为473-773K,还原压力为0.1-20.0MPa,还原氢气体积空速100-20000h-1,加氢反应温度为373-413K,加氢反应压力为0.1-2.5MPa。
在一个实施方案中,所述加氢反应中,3-乙酰氧基丙醛原料采用高压泵输送进入反应系统,液时空速为0.1-10h-1;氢气原料以气体形式直接进料,气体空速为500-20000h-1。
本发明产生的有益效果包括但不限于以下:使用新型Ni/Cu基加氢催化剂,催化剂采用经过碱处理的载体材料,使该催化剂具有优异的低温活性以及目标产物选择性(3-乙酰氧基丙醇),有效提高了加氢生产醇类反应过程的经济效益。利用本发明方法可以高选择性制得高值化学品3-乙酰氧基丙醇,3-乙酰氧基丙醇选择性大于99%。
具体实施方式
为了更好的说明催化剂的制备方法及其在3-乙酰氧基丙醛高选择性制备3-乙酰氧基丙醇反应中的应用,下面举出一些催化剂样品的制备及其在反应工艺中应用的实施例,但本发明不限于所列举的实施例。除非另有具体说明,本申请中的含量和百分比均按“质量”计算。
实施例1
100℃,102.4g Ni(NO3)2·6H2O、18.5g Ca(NO3)2、4.55g Fe(NO3)3·9H2O溶于500ml去离子水,86.5g K2CO3溶于600ml去离子水。搅拌下,将含有Ni-Ca-Fe溶液按1ml/min速度滴入K2CO3溶液中,滴加完成后,将11.5g已进行氨处理的氧化铝粉末加入混合溶液,反应混合物搅拌12h。随后过滤,滤饼用80℃的热水洗涤,洗涤水导电率降低到300μs时停止洗涤。随后过滤,滤饼放入烘箱120℃下干燥24h。上述催化剂制备方法中提及已进行碱处理的氧化铝粉末,碱处理是指200ml三乙胺乙醇溶液(0.3mol/L)加入61.2g氧化铝粉末,65℃搅拌24h,搅拌后过滤,滤饼依次用乙醇和去离子水洗涤3次,滤饼洗涤后放入烘箱120℃干燥48h,得到碱处理的载体材料。
将上述制备的新型镍基多相催化剂加入到滴流床反应器中,通入氢气,催化剂还原温度425℃,还原时间4h,还原压力0.5MPa,还原气体空速1000h-1。催化剂氢气还原后,3-乙酰氧基丙醛经高压计量泵泵入反应器中开始反应,加氢反应温度120℃,反应压力1MPa,3-乙酰氧基丙醛液时空速1.8h-1,氢气/3-乙酰氧基丙醛摩尔比10。液体产物收集于冷阱收集罐内。液体产物使用配有HP-5毛细管柱和FID检测器的HP-7890N气相色谱分析,采用仲丁醇作内标。反应尾气使用配有Porapak-QS柱和TCD检测器的HP-7890N气相色谱进行在线分析。反应结果见表1。
实施例2
加氢多相催化剂制备同实施例1。
除了反应温度130℃替换反应温度120℃,其它反应工艺参数同实施例1。
反应结果见表1。
实施例3
加氢多相催化剂制备同实施例1。
除了反应压力2MPa替换反应压力1MPa,其它反应工艺参数同实施例1。
反应结果见表1。
实施例4
加氢多相催化剂制备同实施例1。
除了3-乙酰氧基丙醛液时空速0.8h-1替换3-乙酰氧基丙醛液时空速1.8h-1,其它反应工艺参数同实施例1。反应结果见表1。
实施例5
加氢多相催化剂制备同实施例1。
除了加氢反应温度130℃,反应压力2MPa,3-乙酰氧基丙醛液时空速0.8h-1,替换加氢反应温度120℃,反应压力1MPa,3-乙酰氧基丙醛液时空速1.8h-1,其它反应工艺参数同实施例1。反应结果见表1。
实施例6
除了催化剂制备过程所用载体用二氧化硅粉末替代氧化铝粉末,载体碱处理过程称取36g二氧化硅粉末取代61.2g氧化铝粉末,其它加氢催化剂制备过程同实施例1。
3-乙酰氧基丙醛加氢反应工艺同实施例5。反应结果见表1。
实施例7
除了称取104.1g Cu(NO3)2·6H2O取代102.4g Ni(NO3)2·6H2O,其它加氢催化剂制备过程同实施例1。
3-乙酰氧基丙醛加氢反应工艺同实施例5。反应结果见表1。
对比例1
除了催化剂制备过程中,称取11.5g不经过碱处理的氧化铝粉末取代11.5g经过碱处理的氧化铝粉末加入混合溶液,其它加氢催化剂制备过程与实施例1相同。
3-乙酰氧基丙醛加氢反应工艺同实施例5。反应结果见表1。
对比例2
除了催化剂制备过程中,称取11.5g不经过碱处理的二氧化硅粉末取代11.5g经过碱处理的二氧化硅粉末加入混合溶液,其它加氢催化剂制备过程与实施例6相同。
3-乙酰氧基丙醛加氢反应工艺同实施例5。反应结果见表1。
表1 3-乙酰氧基丙醛加氢制3-乙酰氧基丙醇反应结果
由表1实施例5反应数据可知,当选用碱处理的氧化铝粉末载体材料制备加氢催化剂,反应温度130℃,反应压力2MPa,3-乙酰氧基丙醛液时空速0.8h-1条件下,转化率99%和3-乙酰氧基丙醇选择性99%;相对应的对比例1反应数据可知,当选用没有经过碱处理的氧化铝粉末载体材料制备加氢催化剂,反应温度130℃,反应压力2MPa,3-乙酰氧基丙醛液时空速0.8h-1条件下,转化率78%和3-乙酰氧基丙醇选择性73%。当载体材料由氧化铝粉末改为二氧化硅粉末,经过碱处理的载体材料制备的加氢催化剂(实施例6),转化率96%和3-乙酰氧基丙醇选择性95%;没有经过碱处理的载体材料制备的加氢催化剂(对比例2),转化率69%和3-乙酰氧基丙醇选择性67%。以上实验结果表明,经过碱处理的载体材料制备的加氢催化剂,可以使原料3-乙酰氧基丙醛通过加氢反应高选择性制备3-乙酰氧基丙醇,因此,本发明提供了一种高选择性制备3-乙酰氧基丙醇的方法。
以上已对本发明进行了详细描述,但本发明并不局限于本文所描述具体实施方式。本领域技术人员理解,在不背离本发明范围的情况下,可以作出其他更改和变形。本发明的范围由所附权利要求限定。
Claims (4)
1.一种高选择性制备3-乙酰氧基丙醇的方法,其特征在于,以3-乙酰氧基丙醛和氢气为原料,在加氢催化剂作用下,合成3-乙酰氧基丙醇;
所述加氢催化剂,其组分为金属活性组分、金属助剂Ca、选择性改进剂以及经过碱处理的载体材料;
金属活性组分选自Ni、Cu金属元素中的一种或两种,选择性改进剂选自K、Fe、Sr金属元素中的一种或多种,所述经过碱处理的载体材料选自氧化铝、活性炭、二氧化硅、硅藻土中的一种或多种;
加氢催化剂中金属活性组分Ni/Cu质量含量为10%-70%、金属助剂Ca的质量含量为2%-10%,选择性改进剂质量含量为0.1%-5%,其余质量为载体;
所述碱处理的载体材料,是指使用含有碱性物质高温处理的载体材料;
碱处理具体步骤为:1)50-500℃,碱性溶液中加入载体材料,搅拌处理4-48 h;2)搅拌后过滤,滤饼用乙醇和去离子水依次洗涤2-4次,洗涤后滤饼放入烘箱80-200℃烘干4-48h,即得到经过碱处理的载体材料;
碱处理载体材料步骤1)中:碱性溶液选自氢氧化钠水溶液、氢氧化钾水溶液、氨水水溶液、三乙胺乙醇溶液、乙醇胺乙醇溶液、三丙胺乙醇溶液中的一种或几种;碱性溶液浓度为0.1-2 mol/L;碱性溶液中碱性物质和载体材料摩尔比为1:5-1:500。
2.根据权利要求1所述的方法,其特征在于,载体材料碱处理具体步骤为:1)80-200℃,碱性溶液中加入载体材料,搅拌处理8-24 h;2)搅拌后过滤,滤饼用乙醇和去离子水依次洗涤2-4次,洗涤后滤饼放入烘箱100-140℃烘干4-48h,即得到经过碱处理的载体材料。
3.根据权利要求1所述的方法,其特征在于,首先进行加氢催化剂还原、然后进行加氢反应,所述反应条件为:还原温度为473-773 K,还原压力为0.1-20.0MPa,还原氢气体积空速100-20000 h-1,加氢反应温度为373-413 K,加氢反应压力为0.1-2.5MPa。
4.根据权利要求1所述的方法,其特征在于,所述加氢反应中,3-乙酰氧基丙醛原料采用高压泵输送进入反应系统,液时空速为0.1-10 h-1;氢气原料以气体形式直接进料,气体空速为500-20000 h-1。
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