N.N-二甲基乙酰胺

性状描述: 无色或近似无色澄明液体。能与水、乙醇、乙醚、苯和氯仿等有机溶剂混溶。相对密度(d204)0.9429。沸点 163～165℃。折光率(n20D)1.4373。闪点66℃。低毒，半数致死量(大鼠，经口)5000mg/kg。有刺激性。

质量标准: 项目Item                                    分析纯          
                                             (AR)            
纯度Purity                                ≥99.0% (GC)
比重Specific gravity (20/20°C)           0.9385-0.9420  
沸程Boiling range,℃                      165-167(95%)  
游离酸(以CH₃COOH计)Free acid,%              ≤0.001        
折光率Refractive index n20/D              1.437-1.439    
灼烧残渣Ignition residue,%                   ≤0.005          
水份Water,%                                  ≤0.05            
混合度Miscibility                            合格



项目                                       优级纯  
                                            (GR)
外观Appearance                            清澈、无悬浮物
纯度Purity                                ≥99.9% (GC)
色度Color scale，Hazen单位                ≤10（铂-钴色号）
水water                                   ≤250 ppm
铁Iron(Fe)                                ≤0.050ppm  
酸度Acidity（乙酸计）                     ≤100.0ppm  
碱度alkalinity（二甲胺计）                ≤5.0ppm
电导率conductivity（25℃）                ≤0.50 us/cm
            


项目                                       化学纯  
                                            (CP)
纯度Purity                                 ≥98.0% (GC)
沸程Boiling range,℃                       164.0~167.0
比重Specific gravity (20/20°C)            0.938～0.942  
折光率Refractive index n20/D               1.437～1.439      
酸度Acidity(以H+计)/（mmol/100g）          ≤0.002  
水分water                                  ≤0.10%  



项目                                              色谱纯
                                                  (HPLC)
纯度Purity                                      ≥99.8% (GC)
紫外吸光度UV Absorbance:
最大吸收波长Wavelength (nm) Max. Absorbance
268                                                1.000
275                                                0.300
300                                                0.080
350                                                0.005
400                                                0.005
溶剂洗脱杂质GC Impurities Eluting Before Solvent  
<0.5 mg/L >水分Water                                          <0.03%
（色谱纯用于HPLC, GC和光谱级，氮气封装。）


品级Grade                               光谱级  
                                    (for spectroscopy)
外观Appearance                          白色至米黄色粉末
红外光谱鉴别Infrared spectrometry       Conforms
纯度Purity                              ≥99.8% (GC)
λ H2O reference  
UV Absorbance 400nm                     ≤0.01
UV Absorbance 360nm                     ≤0.01
UV Absorbance 320nm                     ≤0.03
UV Absorbance 310nm                     ≤0.05
UV Absorbance 290nm                     ≤0.15
UV Absorbance 280nm                     ≤0.30
UV Absorbance 270nm                     ≤1.0
水分Water (by Karl Fischer)             ≤0.05 %
蒸发残渣Residue on Evaporation          ≤0.001 %


品级Grade                               多肽合成级  
                                  (grade for peptide synthesis)
外观Appearance                          透明液体
红外光谱鉴别Infrared spectrometry       Conforms
纯度Purity                              ≥99.8% (GC)
水分water                               ≤0.02%  
胺测试实验suitability in amine test     pass test

储存条件: 密封阴凉保存

用途: 用于药物合成的反应溶剂，合成纤维纺丝与合成树脂的溶剂，感光化学品发色剂的溶剂，涂料等的溶剂。催化剂。