Abstract:

The method of catalytic hydrogenation was used to improve production of ethylene glycol (EG) over Raney nickel catalyst.Under the reaction condition of temperature 353 K , EG liquid hourly space velocity 30 h^-1, H₂ pressure 0.25 MPa, H₂ mass space velocity 0.02 g·ml-1·h^-1 and hydrogenation time 90 d, ultraviolet light transmittance of EG with water content at 220 nm, 275 nm and 350 nm were improved averagely from 49.6%, 88.2%, 97.7% to 73.8%, 93.2%, 99.7% respectively, and further to 84.2%, 95.1%, 99.9% after rectification.The removal efficiency of impurities was up to 75.5%, 60% and 95.8%.The amount of aldehyde was reduced from 11.5 μg·g^-1 to 3.7 μg·g^-1.

Key words:

紫外透过率, 乙二醇, 骨架镍催化剂, 催化加氢

摘要： 对对催化加氢法提高乙二醇质量进行了研究，考察了反应温度、压力和乙二醇空速对乙二醇紫外透过率和杂质去除率的影响。结果表明，在反应温度353 K、乙二醇液时空速 30 h^-1、压力0.25 MPa、氢气质量空速0.02 g·ml^-1·h^-1条件下，催化剂连续运行90 d，乙二醇含水料在220、275、350 nm的UV值由原来的49.6％、88.2％、97.7％平均提高到73.8％、93.2％、99.7％，精馏后乙二醇成品的紫外透过率平均提高到84.2％、95.1％、99.9％，杂质去除率提高到75.5％、60％、95.8％，成品的醛含量由原来的11.5 μg·g^-1下降到3.7 μg·g^-1。

关键词:

紫外透过率, 乙二醇, 骨架镍催化剂, 催化加氢