改性凹凸棒石黏土对乙二醇装置副产二乙二醇脱色研究

Decolourization of diethyleneglycol from by-product of glycol unit by modified attapulgite clay

采用改性凹凸棒石黏土脱色剂对茂名石化乙二醇装置副产二乙二醇进行脱色研究,考察了制备凹凸棒石黏土脱色剂的酸类型和用量、活性组分和加入量、焙烧温度,以及采用固定床吸附脱色时的空速和温度对脱色效果的影响。结果表明:利用质量分数为4%盐酸酸化,加入3%的硝酸铁活性组分,在550℃下焙烧得到的脱色剂,在吸附空速为0.8 h^(-1),脱色温度为50℃条件下对副产二乙二醇进行脱色,脱色率达到96.7%。通过吸附饱和试验发现,1体积的脱色剂可以处理400体积的副产二乙二醇,表明了该改性凹凸棒石黏土对副产二乙二醇具有良好的吸附脱色效果。

A decolorant,modified attapulgite clay,is prepared for refining diethyleneglycol from by-product of glycol unit. The factors affecting diethyleneglycol decoloration rate are investigated,including the type and amount of acid,active component,calcination temperature for decolorant preparation and space velocity and temperature of the fixed. The results show the decoloration rate can reach 96. 7% when the decolorant is prepared under the following conditions： 4% of hydrochloric acid,3% of Fe（ NO_3）_3 active component and 550℃ of calcination temperature and the decoloration is carried out with 20 m L of decolorant in fixed bed,0. 8 h^（-1） of velocity and 50℃ of decoloration temperature. Moreover,diethyleneglycol through adsorption saturation test shows that 1 volume of decolorizing agent can handle 400 volume of by-product,which suggests good adsorptive decolorization performance of the modified attapulgite clay for refining diethyleneglycol.