This thesis mainly introduced that ureas and semicarbazides were synthesized by oxidation of corresponding thioureas and thiosemicarbazides using 30% peroxide as oxidant.

本文主要介绍了以30%浓度的双氧水作为氧剂氧、基来制备相的和基类。

Using sodium hydrosulphide or sodium thiosulfate as materials,the production cost of TGA is low.While,a high content of TGA can be obtained with thiourea as reactant.

本文对巯基乙酸的成工艺进行了比较研究,认为氢钠法和代酸钠法生产成本低,适宜于选矿用巯基乙酸的生产,而法可得到较高浓度的巯基乙酸。