二甲醚气相色谱相对重量校正因子的测定

Determination of Dimethyl Ether Correction Factors in Gas Chromatography with TCD and FID

用冰冷却水吸收二甲醚配制样品，将ＴＣＤ和ＦＩＤ串联使用，测定出二甲醚在ＴＣＤ和ＦＩＤ上相对于甲醇的重量校正因子分别为０．８６和０．５５，并通过用甲醇催化脱水生成的二甲醚和水的化学计量关系，在线间接测定二甲醚在ＴＣＤ上相对于甲醇的重量校正因子，从而使上述测定结果得到佐证。

Dimethyl ether(DME) correction factors in gas chromatography with thermal conductivity detector(TCD) and flame ionization detector(FID) by using H 2 as carrier gas were determined in this work. The home made DME gas was quantitatively absorbed in ice cold water. With ethanol as standard, the aqueous mixture was injected into a gas chromatograph, equipped with serially connected TCD and FID. The weight correction factors of DME based on methanol were 0 86 and 0 55 for TCD and FID respectively. The result for TCD was also confirmed by calculation based on the stoichiometrical transformation of methanol into DME in reaction gas chromatography.