Thiourea

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Specification

Synonyms: thiourea, acid diamide thiocarbonic

Chemical formula: CH4N2S

International name: THIOUREA

CAS No: 62-56-6

Appearance: brilliant colorless crystals

Packing: bags of 25 kg

Storage: Store in a dry, well-ventilated area

Thiourea (thiourea, thiocarbonic acid diamide) - the bitter taste of colorless crystals. Limited solubility in water, methanol, ethanol, pyridine, insoluble in diethyl ether, benzene, CCl4. Prolonged heating above 130 ° C is converted into ammonium thiocyanate NH4SCN.
Receiving
Thiourea (thiourea) is obtained:
• ammonium thiocyanate isomerization by heating above 150 ° C:
NH4SCN H2NC (S) NH2
• interaction of calcium cyanamide with H2S or inorganic sulfides;
Ca (CN) 2 + (NH4) 2S + 2H2O -> H2NC (S) NH2 + Ca (OH) 2 + 2NH3
• The interaction of carbon disulfide with ammonia at 160 ° C:
CS2 + 2NH3 -> H2NC (S) NH2 + H2S

Application
Thiourea (Thiourea) applies:
• synthesis of thiols (mercaptans, dyes, synthetic resins,
• in Medicine
• for separating paraffins flotoagenta, as a reagent for the photometric determination of Bi, Os, Re, Ru;
• Thiourea has fungicidal and others.

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