The catalytic properties of zinc oxide catalysts from zinc oxide , zinc acetate calcined at 600 and zinc carbonate prepared through deposition , in the synthesis of dimethyl carbonate by alcoholysis of urea were studied 摘要研究了在600煅烧氧化锌、醋酸锌和沉淀法制得碳酸锌而得到的氧化锌催化剂，对尿素醇解制备碳酸二甲酯的催化作用。
Rough calculation of investment : 1 ) methyl carbonate : total investment is rmb100 million yuan ; investment return period is 4 years . 2 ) granular dry ice powder : total investment is rmb31 million yuan ; investment return period is 2 years . 3 ) salicylic acid : total investment is rmb25 million yuan ; investment return period is 3 years . 4 ) sodium carbonate : total investment is rmb50 million yuan ; investment return period is 3 years . 5 ) ethylene urea : total investment is rmb60 million yuan ; investment return period is 4 years 投资概算： 1 、碳酸二甲酯项目总投资1亿元，投资回收期4年； 2 、颗粒干冰粉项目总投资3100万元，投资回收期2年； 3 、水杨酸项目总投资2500万元，投资回收期3年； 4 、轻质氧化鲜项目总投资2000万元，投资回收期2年； 5 、碳酸钠项目总投资5000万元，投资回收期3年； 6 、乙撑脲项目总投资6000万元，投资回收期4年。
