Abstract: On the basis of previous work in hydrofining crude benzole with pure hydrogen, further study was made of the utilization of low concentration hydrogen as a raw treating gas. Successful precaution was employed to overcome coking trouble by means of pretreatment of the crude benzole and raw gas, effect of which was discussed. The influence of process variables on Br. No. and S reduction in the product oil was then investigated; the differences in reactivity of crude benzole from several sources were also observed. A set of compromised operating conditions for hydrofining crude benzole from a certain plant to obtain a product of Br. No.<0.5 and S<0.01% was suggested. The result was verified in a larger equipment with 200ml. catalyst volume. The activity of the catalyst could be maintained through the 200-hr, run. Material balance was obtained with a liquid yield of 98.7%. The product oil of Br. No.0.3 and S 0.002% after fraction nation gave benzene of synthetic grade with a 99.1% recovery. Additional experiments showed that the type 402 catalyst retained its good activity after regeneration and prolonged heat treatment at elevated temperature. Development work with pure hydrogen was carried out in a pilot plant of 9-liter catalyst volume. Under a pressure of 20 kg/cm2, 380℃, L. H. S. V. 2.0, a product of Br. No. 0.4, S 0.01% was obtained, with a liquid yield of 98.2%. Benzene, fractionated out, was of synthetic grade. The activity of the catalyst, prepared with industrial grade carrier and on an enlarged scale, remained unchanged during this 150 hr. run, and its good regeneration ability and thermal stability were also confirmed. Further demonstration plant work was recommanded to collect design data and to gain additional operating experience.

摘要： 本文报导以低氢浓度气体加氢精制粗笨的实验室研究结果以及以纯氢气体加氢精制粗笨的中型工厂扩大试验的结果。在以低浓度氢气加氢精制粗笨的实验室研究中,找出了克服结焦的试验流程,考察了过程变数对粗笨脱硫及烯烃饱和反应的影响;比较了不同来源的粗笨的反应性能。通过上述试验找到了获得含硫0.01％及溴价0.5以下的产品的条件。参照所选样的条件,在装有200毫升催化剂的较大反应装置中顺利运转了200小时,油收率98.7%,苯符合合成级规格。 其后在装有9升催化剂的中型工厂中进行了扩大试验。试验表明,以纯氢为原料,在压力20公斤/厘米~2、温度380℃、空速2.0下,生成油溴价及含硫量分别在0.4及0.01％以下,基本上重复了试验室的结果,收率平均为98.2%,产品符合合成级规格。