碱洗预处理法测定中低温煤焦油溴值

以碱洗作为预处理方法去除中低温煤焦油中酚类对溴值的干扰，建立中低温煤焦油的溴值测定方法。使用模型化合物考察并确定了酚类对溴值测定的影响，并以酚类和烯烃模型化合物分别考察碱洗方法的脱酚效果和加标回收率。该方法脱酚率可达100%，实际样品脱酚率大于97.0%。该方法的加标回收率大于96.8%，相对标准偏差小于2.0%，预处理后油相与水相交叉小。

DETERMINATION OF BROMINE NUMBER OF MID-LOW TEMPERATURE COAL TAR BY ALKALI WASH PRETREATMENT

An alkali pre-washing for determination of bromine number of mid-low temperature coal tar was established, by which the interference of phenols in the coal tar on bromine number could be avoided. The influence of phenols on the determination of bromine number was investigated and determined by model compounds. The phenolic and olefin model compounds were used to investigate the phenol removal rate and the standard recovery, respectively. The removal of phenols reaches 100% by the alkali pre-washing method. For actual samples this rate is greater than 97.0%. The standard addition recovery is greater than 96.8% and the relative standard deviation is less than 2.0%. The oil phase and water phase cross little after pretreatment.