Dithiocyanate methane, also known as methyl dithiocyanate, seed soaking spirit, and methylene dithiocyanate, is abbreviated as MBT. Light yellow or nearly colorless needle-like crystals. Molecular weight: 130.2, relative density (20â??) : 1.1�±0.1, m.p. : 102-104â??, Flash point: 53â??. It is almost insoluble in water, with a solubility of 2.3�?10-6 in water at room temperature. So when in use, some special dispersants and penetrants are usually added. It is soluble in dioxane, dimethylformamide, etc., and slightly soluble in other organic solvents. MBT is very stable in the pH range of 6 to 6.5, but it will hydrolyze rapidly when the pH reaches 8. Under pressure, an excess of sodium thiocyanate (or sodium thiocyanate) and dichloromethane are added to the reactor, and the stirring is started. At the same time, the temperature is raised to 80-100. After the reaction is completed, dichloromethane is recovered, and the solid and liquid phases are separated to obtain crude dithiocyanate methane.
