CN112710757B - N-苯基双(三氟甲磺酰亚胺)的检测方法 - Google Patents
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Abstract
本发明涉及一种N‑苯基双(三氟甲磺酰亚胺)的检测方法,所述方法为使用配紫外检测器和色谱柱的高效液相色谱仪进行检测,包括:用流动相配制标准品的梯度浓度溶液,并用流动相稀释,过滤备用;用流动相将待测样品溶解并定容,过滤,得到样品溶液备用;拟合样品峰面积和标准品实际浓度的标准曲线,计算待测样品中N‑苯基双(三氟甲磺酰亚胺)的含量;其中,流动相为等度洗脱流动相,组成为A/B=65/35,A相为正己烷,B相为二氯甲烷。本发明采用流动相(正己烷/二氯甲烷)按65/35体积比混合,主峰和邻峰分离度高达2.6,杂质与主含量完全分开,样品在2min快速溶清,可保证检测的灵敏度、稳定性和提高检测效率。
Description
技术领域
本发明涉及检测技术领域,具体是N-苯基双(三氟甲磺酰亚胺)的检测方法。
背景技术
N-苯基双(三氟甲磺酰亚胺)是一种高效的三氟甲磺酰化试剂,常用于酚、一级胺、烯醇的选择性三氟甲磺酰化。N-苯基双(三氟甲磺酰亚胺)在精细化学品,医药中间体,合成原料应用广泛。N-苯基双三氟甲磺酰亚胺目前在一些重要的有机化学反应中替代传统的Bronsted酸和Lewis酸用作高催化剂;合成对环境友好的离子液体,在反应体系中可作为循环利用的绿色溶剂;作为合成锂离子电池的高效稳定电解液添加剂N-苯基双三氟甲磺酰亚胺锂的重要原料。
关于N-苯基双(三氟甲磺酰亚胺)的检测方法,刘智慧,郭绪涛,杨献奎在《DMAP催化的N-苯基.双(三氟甲磺酰亚胺)亚胺的合成方法研究》中使用液相色谱法测试,该方法中流动相使用的是正己烷与乙酸乙酯,但N-苯基双(三氟甲磺酰亚胺)在流动相中溶解不完全,溶解时间长,存在一定局限性。在专利CN104477861B中,N-苯基双(三氟甲磺酰亚胺)的含量采用拉曼光谱检测,此方法对样品含量有较高要求,且常出现线性的非线性问题。因此,有必要针对N-苯基双(三氟甲磺酰亚胺)的定量检测,建立一套快速、简单、准确的方法。
发明内容
(一)要解决的技术问题
鉴于现有技术的上述缺点、不足,本发明提供一种N-苯基双(三氟甲磺酰亚胺)的检测方法,以高效简便的分析技术手段实现N-苯基双(三氟甲磺酰亚胺)的检测,克服现有液相色谱和拉曼检测方法的不足。
(二)技术方案
为了达到上述目的,本发明采用的主要技术方案包括:
一种N-苯基双(三氟甲磺酰亚胺)的检测方法,所述方法包括:
用流动相配制标准品的梯度浓度溶液,并用流动相稀释,过滤备用;
用流动相将待测样品溶解并定容,过滤,得到样品溶液备用;
准备配紫外检测器和色谱柱的高效液相色谱仪,设置进样量、进样流速、柱温、检测器波长;设置序列,待仪器稳定后进样检测;
拟合样品峰面积和标准品实际浓度的标准曲线,计算待测样品中N-苯基双(三氟甲磺酰亚胺)的含量;
其中,所述流动相为等度洗脱流动相,组成为A/B=65/35,其中A相为正己烷,B相为二氯甲烷。
根据本发明较佳实施例,其中,设置进样量为5μL,进样流速为0.8mL/min,柱温为30℃,检测器波长为254nm。
根据本发明较佳实施例,其中,所述色谱柱为SiO2色谱柱;优选为Welch ultimateSiO2正相色谱柱,但不局限于Welch ultimate SiO2。
根据本发明较佳实施例,其中,所述标准品的梯度浓度溶液包括50,500,1000,2500,5000mg/L的标准品溶液。
根据本发明较佳实施例,其中,用流动相将待测样品溶解并定容到100mL。
根据本发明较佳实施例,其中,所述过滤均采用有机膜过滤。
(三)有益效果
本发明的检测方法相比拉曼光谱有更好的线性,能更精确测量N-苯基双(三氟甲磺酰亚胺),且受杂质干扰较小。运用本发明的方法测定N-苯基双(三氟甲磺酰亚胺)含量,杂质表述全面,分离度高,时间短,测试效率高,稳定性好,对仪器的要求低。
附图说明
图1为待测目标物N-苯基双(三氟甲磺酰亚胺)的色谱图。
具体实施方式
为了更好的解释本发明,以便于理解,下面结合附图,通过具体实施方式,对本发明作详细描述。
实施例1
本实施例检测N-苯基双(三氟甲烷磺酰亚胺)含量的步骤如下述:
(1)配备紫外检测器的高效液相色谱仪,色谱柱为Welch ultimate SiO2 4.6*250mm.5μm。
(2)设置实验条件:进样量为5μL;流动相:等度洗脱,A/B=65/35,其中A相为正己烷,B相为二氯甲烷,检测器波长:254nm;流速:0.8mL/min;柱温:30℃;分析时间:10min。
(3)准备流动相A/B=65/35,其中A相为正己烷,B相为二氯甲烷,取适量N-苯基双(三氟甲烷磺酰亚胺)标准品,配成50,500,1000,2500,5000mg/L的标准溶液后,取适量样品用流动相定容到100mL的容量瓶中为样品溶液,有机滤膜过滤备用,设置序列,待仪器稳定后开始进样。出峰位置为3.87min(如图1所示,珠峰和邻峰具有很高的分离度),标准曲线为y=515.64x+47046,R2=0.9999。
对比例1
本对比例检测N-苯基双(三氟甲烷磺酰亚胺)含量的步骤如下述:
(1)配备紫外检测器的高效液相色谱仪,色谱柱为Welch ultimate SiO2 4.6*250mm.5μm;
(2)设置实验条件:进样量为5μL;流动相:等度洗脱,A/B=65/35,其中A相为正己烷,B相为乙酸乙酯,检测器波长:254nm;流速:0.8mL/min;柱温:30℃;分析时间:10min;
(3)准备流动相A/B=65/35,其中A相为正己烷,B相为乙酸乙酯,取适量N-苯基双(三氟甲烷磺酰亚胺)标准品,配成50,500,1000,2500,5000mg/L的标准溶液后,取适量样品用流动相定容到100mL的容量瓶中为样品溶液,有机滤膜过滤备用,设置序列,待仪器稳定后开始进样。出峰位置为3.67min(如图一所示),标准曲线为y=425.5x+76530.8,R2=0.9983。
对比例2
本对比例检测N-苯基双(三氟甲烷磺酰亚胺)含量的步骤如下述:
(1)配备紫外检测器的高效液相色谱仪,色谱柱为Welch ultimate SiO2 4.6*250mm.5μm;
(2)设置实验条件:进样量为5μL;流动相:等度洗脱,A/B=80/20,其中A相为正己烷,B相为二氯甲烷,检测器波长:254nm;流速:0.8mL/min;柱温:30℃;分析时间:10min;
(3)准备流动相A/B=80/20,其中A相为正己烷,B相为二氯甲烷,取适量N-苯基双(三氟甲烷磺酰亚胺)标准品,配成50,500,1000,2500,5000mg/L的标准溶液后,取适量样用流动相定容到100mL的容量瓶中为样品溶液,有机滤膜过滤备用,设置序列,待仪器稳定后开始进样。出峰位置为4.21min,标准曲线为y=632.3x+59235,R2=0.9957。
将上述三组例的测试效果比较如下表:
由上述表格内容可知,测试条件为:流动相(正己烷/二氯甲烷)按照65/35体积比混合时,分离度高,杂质与主含量完全分开,可保证检测的灵敏度和稳定性。而改变正己烷/二氯甲烷的体积比或者改变流动相的组成,都存在溶解时间过长或溶液浑浊,分离度较低的问题。实施例1中,采用正己烷/二氯甲烷=65/35的流动相,分离度达到2.6,远远高于对比例1-2。由此可见,本发明只是通过简单的方案改进,调整流动相的组成并确定比例,即取得了预料不到的技术效果。
本发明的快速检测方法,可对N-苯基双(三氟甲磺酰亚胺)监控和分析,考察合成N-苯基双(三氟甲磺酰亚胺)工艺中原料配比,反应时间,同时为N-苯基一双(三氟甲磺酰亚胺)的质量标准提供分析依据。
最后应说明的是:以上各实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述各实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。
Claims (5)
1.一种N-苯基双(三氟甲磺酰亚胺)的检测方法,其特征在于,所述方法包括:
用流动相配制标准品的梯度浓度溶液,并用流动相稀释,过滤备用;
用流动相将待测样品溶解并定容,过滤,得到样品溶液备用;
准备配紫外检测器和SiO2色谱柱的高效液相色谱仪,设置进样量、进样流速、柱温、检测器波长;设置序列,待仪器稳定后进样检测;
拟合样品峰面积和标准品实际浓度的标准曲线,计算待测样品中N-苯基双(三氟甲磺酰亚胺)的含量;
其中,所述流动相为等度洗脱流动相,组成为A/B=65/35,A相为正己烷,B相为二氯甲烷。
2.根据权利要求1所述的检测方法,其特征在于,设置进样量为5μL,进样流速为0.8mL/min,柱温为30℃,检测器波长为254nm。
3.根据权利要求1所述的检测方法,其特征在于,所述标准品的梯度浓度溶液包括50,500,1000,2500,5000mg/L的标准品溶液。
4.根据权利要求1所述的检测方法,其特征在于,用流动相将待测样品溶解并定容到100mL。
5.根据权利要求1所述的检测方法,其特征在于,所述过滤均采用有机膜过滤。
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