Industrial Study On The UV Increase Of Coal-prepared EG With Catalytic Hydrogenation

EG is an important industrial material, which can be used for the synthesis ofpolyester and synthetic fiber. However, due to the equipment and resources, the EGproduced through the new method shows a poor quality with new defects.Theproperties of EG decides the product to a large extent, like the product’s color andintensity.In the paper, the catalytic hydrogenation was used to reduce the unsaturateddefects in coal-prepared EG. After the reduction, the purification using the modifiedactivated carbon to remove the impurities was adopted to increase the UV value tomeet the national criterion.The main contents are:(1) Using different active constituent, carrier and methodto fabricate different hydrogenation catalysts and characterizing them;(2) Evaluatingthe activity of the catalysts, selecting the most active one and optimizing thepreparation conditions;(3) Optimizing the catalysis reaction to improve the UV ofEG and (4) Physically absorbing the unreduced defects using the activated carbon andoptimizing it to meet the national criterion.The results show:(1) NiO-γ-Al2O3prepared using the multi-stepimpregnation method obtained the best catalytic activity at pH of7, Ni(NO3)2·6H2Oand γ-Al2O3molar ratio of1:1, calcination temperature of600℃and calcinationtime of6h;(2) During the catalytic hydrogenation, the UV of EG under220nm,275nm and350nm reached67.5%,90.7%and99.9%, respectively at the reactiontemperature of90℃, reaction time of8h, hydrogen pressure of0.3MPa and thecatalytic dose of1%;(3) After the catalytic hydrogenation, the adsorption workedbest in sealed N2under high temperatures using nitric acid-oxidized activated carbonand the UV of EG under220nm,275nm and350nm reached78.2%,94.7%and99.9%, respectively at the adsorption temperature of60℃, adsorption time of70min and the EG and activated carbon mass ratio of180:1.