Thiourea is an important organosulfur compound with the chemical formula CH4N2S. The following is a detailed introduction to thiourea: Basic Information - Synonyms: Thiocarbamide, Sulourea, THU, etc. - Molecular Structure: It has the structure H2N−C(=S)−NH2, which is similar to that of urea (H2N−C(=O)−NH2), except that the oxygen atom in urea is replaced by a sulfur atom. Physical Properties - Appearance: It is a white crystalline solid with a shiny appearance. - Odor: It is odorless when pure, but commercial products may have a slight odor. - Melting Point: The melting point is around 171 °C. - Boiling Point: It decomposes rather than boils at normal pressure. It has a boiling point of 186.8 °C at 760 mmHg. - Density: The density is 1.405 g/cm³. - Solubility: It is soluble in water, with a solubility of 13.6 g/100 mL at 20 °C. It is sparingly soluble in ethanol and almost insoluble in ether and chloroform. Chemical Properties - Stability: It is stable under normal conditions, but it is incompatible with strong acids, strong bases, strong oxidizing agents, metallic salts, proteins, and hydrocarbons. - Combustibility: It is combustible and can burn when exposed to open flame or high heat. - Decomposition Reaction: When heated, it decomposes to release toxic gases such as nitrogen and sulfur oxides. It turns into ammonium thiocyanate at 150 °C. It sublimes at 150 - 160 °C in a vacuum and decomposes at 180 °C. - Redox Property: It has reducibility and can reduce free iodine to iodide ions. - Reactivity: It is highly reactive and can be used to prepare various compounds. It can react with a variety of oxidizing agents to form urea, sulfuric acid, and other organic compounds. It can also form easily soluble addition compounds with inorganic compounds. Production Methods - From Calcium Hydrosulfide and Calcium Cyanamide
Items
|
Test Result
|
Content of Thiourea |
99.07%
|
Water Insoluble Substance |
0.016%
|
Thiocyanate |
<0.02% |
Heating Loss |
0.21%
|
Ash |
0.031%
|






: Absorb hydrogen sulfide with lime milk under negative pressure and cooling to generate calcium hydrosul