CN103483172B - 一种二苯甲酰甲烷的制备方法 - Google Patents
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/45—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by condensation
- C07C45/455—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by condensation with carboxylic acids or their derivatives
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
Abstract
一种二苯甲酰甲烷的制备方法,以苯乙酮和苯甲酸甲酯为原料,在氮气保护下,以氢化钠为催化剂,于0~50℃下,在甲苯溶剂中发生缩合反应,反应液经酸洗、碱洗、水洗、溶剂回收、重结晶、过滤、干燥后,即得到产品。本发明的反应条件温和,降低了工业能耗,保证了催化剂活性,提高了产品收率和纯度。
Description
技术领域
本发明涉及一种热塑性塑料稳定剂的合成工艺,具体涉及一种氢化钠催化制备二苯甲酰甲烷的新方法。
背景技术
二苯甲酰甲烷分子结构式:
,
二苯甲酰甲烷( 1,3-二苯基-1,3-丙二酮、Dibenzoylmethane、DBM )是一种重要的β-二酮结构的热塑性塑料用的光稳定剂、热稳定剂,广泛用于聚氯乙烯(PVC)塑料和丙烯腈-丁二烯-苯乙烯(ABS)树脂中,主要用作聚氯乙烯制品的助热稳定剂。
作为新型PVC辅助热稳定剂,二苯甲酰甲烷具有高效、无毒、多功能等优点。与固体或液体钙/锌,钡/锌等热稳定剂并用,能大大改善PVC初期着色,透明度,长期稳定性,以及加工过程中的析出和“锌烧”等,广泛用于医疗,食品包装等无毒透明PVC制品(例如PVC瓶,片材,透明薄膜等)。在欧洲国家,以及美国、加拿大、澳大利亚、日本等发达国家都允许在食品包装领域内使用该产品。
此外,二苯甲酰甲烷也具有一定吸收紫外线的功能,紫外吸收功能优于常用的二苯甲酮类及苯并三唑类吸收剂,稳定性强,且无毒无刺激;二苯甲酰甲烷还用于合成高效除草剂1,2-二甲基-3,5-二苯基吡唑的硫酸甲基盐,用于贵重、稀有金属的萃取,可作为铀的富集剂;还可用于合成高效稀土有机配合物荧光材料等。
现有技术中二苯甲酰甲烷的合成工艺,反应温度普遍较高,导致催化剂活性降低,副产物增多,所以开发一种条件温和、产物收率高的二苯甲酰甲烷制备新工艺具有重要的意义。
发明内容
本发明的目的在于克服现有技术的不足,在低温条件下反应生成二苯甲酰甲烷,提供一种产品收率好,反应周期短,溶剂能够回收的二苯甲酰甲烷的制备方法。
为实现上述目的,本发明采用的技术方案是,一种二苯甲酰甲烷的制备方法,以苯乙酮和苯甲酸甲酯为原料,在氮气保护下,以氢化钠为催化剂,于0~50℃下,在甲苯溶剂中发生缩合反应,反应液经酸洗、碱洗、水洗、溶剂回收、重结晶、过滤、干燥后,即得到产品。
所述酸洗过程是将15~50%(质量分数)的盐酸搅拌下加入反应液中,静置分层,分去水相;所述碱洗过程是将酸洗过程中分去水相后得到有机相用5~30%(质量分数)的碳酸氢钠溶液洗涤,然后静置分层,分去水相;所述水洗过程是将碱洗过程中分去水相得到的有机相用水洗涤,然后静置分层,分去水相;将水洗过程得到的有机相经减压蒸馏回收溶剂,得到二苯甲酰甲烷粗品;将得到的二苯甲酰甲烷粗品采用结晶溶剂重新加热溶解,使溶液为过饱和状态,于-10~25℃下结晶1~10小时;然后将结晶产物过滤、干燥。
所述的结晶溶剂可以是甲醇、乙醇、异丙醇、丙酮中的一种或几种。
优选的,苯甲酸甲酯与苯乙酮物质的量之比1~2: 1,氢化钠与苯乙酮的物质的量之比1~1.8: 1,甲苯与苯乙酮的质量比5~10: 1,所述缩合反应的反应温度为0~50℃,反应时间为1~3h。
本发明所述的二苯甲酰甲烷的制备方法的主要化学合成反应式为:
本发明产生的有益效果是,(1)采用氢化钠为催化剂,因为氢化钠具有超强碱性,不仅可以催化生成二苯甲酰甲烷,也可与反应生成的甲醇进一步反应生成甲醇钠,而甲醇钠作为碱性催化剂也可催化生成二苯甲酰甲烷。此方法避免了高温蒸出甲醇的步骤,生成的氢气易收集,缩短了反应时间,简化了操作步骤,促进反应向正方向进行,提高了反应收率。(2)降低了反应温度,将反应温度保持在0~50℃,反应条件温和,降低了工业能耗,保证了催化剂活性,提高了产品收率和纯度。所得产品为类白色结晶性粉末,缩合收率为85%~89%,结晶收率为95%,纯度为99.8%。
附图说明
图1是本发明实施例2制备的产品的红外光谱图;
图2是本发明实施例2制备的产品的1H-NMR图;
图3是本发明实施例2制备的产品的13C-NMR图。
具体实施方式
实施例1
在250mL三口烧瓶中加入甲苯62mL,采用机械搅拌,所用仪器均需要提前干燥。体系在氮气保护下,依次加入氢化钠2.0g,11.3g苯甲酸甲酯,保持体系温度为0℃,开始滴加10g苯乙酮,0.5h滴加完毕,然后将反应温度提升至50℃搅拌0.5h,体系产生的氢气通过鼓泡器排除。待无氢气产生时,停止通氮气。向反应液中加入15%(质量分数)盐酸60mL酸化,加大搅拌力度,至粘稠状物质完全变为液体,待粘稠状物质消失后,分去水相,将有机相倒入分液漏斗中,再用5%(质量分数)NaHCO360mL碱洗,分去水相,有机相再水洗后,经减压蒸馏后脱去溶剂和多余的苯甲酸甲酯,即得淡黄色粗品,粗品用30mL甲醇加热溶解,然后在25℃下结晶1小时,过滤、干燥,即得类白色产品15.8g。产品总收率为85%,纯度为99.5%,熔点为78℃。
实施例2
在250mL三口烧瓶中加入甲苯70mL,采用机械搅拌,所用仪器均需要提前干燥。体系在氮气保护下,依次加入氢化钠3.6g、苯甲酸甲酯22.6g,保持体系温度为30℃,开始滴加10g苯乙酮,1h滴加完毕,然后搅拌1h,体系产生的氢气通过鼓泡器排除。待无氢气产生时,停止通氮气。向反应液中加入50%(质量分数)盐酸30mL酸化,加大搅拌力度,至粘稠状物质完全变为液体,待粘稠状物质消失后,分去水相,有机相再用30%(质量分数)NaHCO340mL碱洗,再水洗,经减压蒸馏后脱去溶剂和多余的苯甲酸甲酯,即得淡黄色粗品,粗品用50mL乙醇加热溶解,在-10℃下结晶10小时,过滤、干燥即得类白色产品16.3g。产品总收率为88%,纯度为99.7%,熔点为77℃。如图1-3所示,本实施例所得产品的测定结果如下:IR ( KBr ) νmax(cm-1) : 3445,1597,1540,1310,1228,1191,999,706,681,609; 1H-NMR (CDCl3 400 MHz) : δ =8.01 (t, J=8.0Hz, 4H, Ar-H), 7.54 (t, J=4.0Hz, 2H, Ar-H), 7.49 (t, J=8.0Hz, 4H, Ar-H), 6.87 (s, 1H, CH-H); 13C-NMR (CDCl3 100 MHz) : 185.80, 135.53, 132.55, 128.75, 127.23, 93.20。
实施例3
在1L三口烧瓶中加入甲苯620mL,采用机械搅拌,所用仪器均需要提前干燥。体系在氮气保护下,依次加入氢化钠13.9g、85.1g苯甲酸甲酯,保持体系温度为0℃,开始滴加50g苯乙酮,2h滴加完毕,然后将反应温度提升至40℃搅拌1h,体系产生的氢气通过鼓泡器排除。待无氢气产生时,停止通氮气。向反应液中加入30%(质量分数)盐酸150mL酸化,加大搅拌力度,至粘稠状物质完全变为液体,待粘稠状物质消失后,分去水相,有机相用10%(质量分数)NaHCO3150mL碱洗,再水洗,经减压蒸馏后脱去溶剂和多余的苯甲酸甲酯,即得淡黄色粗品,粗品用170mL丙酮加热溶解,然后在20℃结晶5小时,过滤、干燥,即得类白色产品78.4g。产品总收率为84%,纯度为99.7%,熔点为77℃。
实施例4
在3L三口烧瓶中加入甲苯1500mL,采用机械搅拌,所用仪器均需要提前干燥。体系在氮气保护下,依次加入氢化钠50g、220g苯甲酸甲酯,保持体系温度为50℃,开始滴加150g苯乙酮,1.5h滴加完毕,然后搅拌1.5h,体系产生的氢气通过鼓泡器排除。待无氢气产生时,停止通氮气。向反应液中加40%(质量分数)盐酸500mL酸化,加大搅拌力度,至粘稠状物质完全变为液体,待粘稠状物质消失后,分去水相,有机相再用15%(质量分数)NaHCO3500mL碱洗,再水洗,经减压蒸馏后脱去溶剂和多余的苯甲酸甲酯,即得淡黄色粗品,粗品用800mL异丙醇加热溶解,然后在10℃下结晶5小时,过滤、干燥即得类白色产品250.1g。产品总收率为89%,纯度为99.7%,熔点为78℃。
Claims (1)
1.一种二苯甲酰甲烷的制备方法,以苯乙酮和苯甲酸甲酯为原料,其特征在于,在氮气保护下,以氢化钠为催化剂,于0~50℃下,在甲苯溶剂中发生缩合反应,反应液经酸洗、碱洗、水洗、溶剂回收、重结晶、过滤、干燥后,即得到产品;其中,所述酸洗过程是将15~50wt%的盐酸搅拌下加入反应液中,静置分层,分去水相;所述碱洗过程是将酸洗过程中分去水相后得到有机相用5~30wt%的碳酸氢钠水溶液洗涤,然后静置分层,分去水相;所述水洗过程是将碱洗过程中分去水相得到的有机相用水洗涤,然后静置分层,分去水相;将水洗过程得到的有机相经减压蒸馏回收溶剂,得到二苯甲酰甲烷粗品;将得到的二苯甲酰甲烷粗品采用结晶溶剂重新加热溶解,于-10~25℃下结晶1~10小时;然后将结晶产物过滤、干燥;其中,所述的结晶溶剂为甲醇、异丙醇、丙酮中的一种或几种;其中,苯甲酸甲酯与苯乙酮物质的量之比1~2: 1,氢化钠与苯乙酮的物质的量之比1~1.8: 1,甲苯与苯乙酮的质量比5~10: 1,所述缩合反应的反应温度为0~50℃,反应时间为1~3h。
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