1317-36-8 Usage
Description
Lead monoxide, also known as litharge or massicot, is a chemical compound with the formula PbO. It occurs in two polymorphs: the reddish or orange-red alpha form (litharge) and the yellow beta form (massicot). The alpha form is stable at ordinary temperatures and converts to the beta form when heated at 489°C. Lead monoxide is an odorless gray or yellow-green or red-brown solid that sinks in water and is insoluble in water and ethanol but soluble in dilute nitric acid and alkalies.
Uses
Used in Electronics and Glass Industry:
Lead monoxide is used as a component in electron tubes, picture tubes, optical glass, anti-X-ray lead glass, and radiation-resistant rubber products. It is also used in the manufacture of high refractive index optical glass and ceramic enamel.
Used in Metal Smelting and Chemical Production:
Lead monoxide is utilized in smelting metal lead and preparing lead glass, lead compounds, catalysts, and paint driers. It is also used as an intermediate/precursor in the production of various products such as waterproof cements, lubricants, lubricating oils, inorganic pigments, lead soaps, and petroleum refining.
Used in Pharmaceutical and Analytical Applications:
Lead monoxide serves as an analytical reagent and silicate flux. It is also used for the precipitation of amino acids and in the assay of gold and silver ores.
Used in Paint and Plastic Industry:
In the paint industry, lead monoxide is used with oil to make lead soap for paint driers. It is also used in the manufacture of PVC plastic stabilizers and as a raw material for other lead salts.
Used in Rubber and Petroleum Industry:
Lead monoxide is used as a vulcanizing agent in the rubber industry and as an efficient catalyst for condensation reactions in organic synthesis in the petroleum industry.
Used in Ceramic and Pottery Industry:
Lead monoxide is employed in the manufacture of glazes for fine tableware and as a glass flux for painting on porcelain and glass. It is also used in the production of artificial tortoise shell and horn.
Used in Cosmetics and Personal Care:
Lead monoxide is used in ointments, plasters, and the preparation of lead subacetate solution. It is also used for coloring sulfur-containing substances such as hair, nails, wool, and horn.
Used in Manufacturing of Batteries:
Lead monoxide is used as a starting material in the synthesis of Dibasic Lead Phthalate Hydrate (D417070), a compound used in vinyl wire insulation as a flame retardant. It is also the principal component in pastes for the grids used in lead-acid batteries.
Used in Adhesives and Metallurgy:
Lead monoxide can be blended with glycerol to produce hard materials as adhesives in the glass and rubber industry. It is also used as a fluxing agent for decomposing silicate and metallurgy and as a paint drier.
Toxicity
(1) see lead monoxide(2) The early poisoning symptom is that lead lines appear on the edge of the gums, which may not appear when obviously poisoning, and the skin is soil gray. Neurasthenic syndrome will also emerge in the early period of poisoning. The cerebellar poisoning can result in lead poisoning depression, lead poisoning mania, as well as lead toxicity and paralysis sensitivity multiple neuritis. The lead poisoning can also cause hypochromic anemia and metabolic and endocrine disorders. Moreover, the lead poisoning can inhibit the activity of certain enzymes in digestive system and cause indigestion, abdominal severe pain and liver damage. And it can also cause high blood pressure and cholesterol increasing.If there is severe abdominal pain, some measures can be taken, such as subcutaneous injection of atropine and other drugs, abdominal warm, enema, hot water bath and so on.The maximum allowable concentration in air is 0.01 mg/m3.Wearing mask in operation can block 95% to 97% of lead dust. When steam concentration is high, the filter-type gas mask or hose-type gas masks can be used to mandatorily supply fresh air. In the workplace, eating and smoking are prohibited during working hours. It is essential to take a shower after work and gargle and brush your teeth before meals and after work. After bathing, the lead on the hands or other contaminated parts should also be washed with 1% acetic acid solution. People who have symptoms of lead poisoning should be temporarily out of work, and serious people should be exchanged to the operating post long-termly exposed to lead.
production
(1) Lead oxidation method: heat lead for melting to make lead tablets, and then grind at 170~210℃ and roast for oxidation at high temperature above 600℃. The oxide products are grind to obtain the finished lead oxide. 2Pb + O2-->2PbO(2) The lead oxidation method sees "lead monoxide".Lead monoxide can also be prepared by heating lead nitrate or lead carbonate as:2Pb(NO3)2-->2PbO+ 4NO2+O2PbCO3-->PbO +CO2
Production Methods
Lead monoxide is obtained commercially by two processes, Barton process and the Ball Mill process. The Ball-Mill process involves reaction of molten lead with oxygen or air, and in the Barton process atomized molten lead is stirred in a mechanical furnace above 550°C. The molten metal splashed by the stirring paddle comes in contact with air fed into the cover of the furnace through a pipe, thus forming a mist of finely divided lead monoxide. The mist also contains a small amount of unreacted lead. The mist is passed through an upright shaft where a major portion of unreacted lead falls back into the furnace. It is then rapidly cooled and collected in condensing chambers. The crude product may contain 1 to 3% lead. It is finely ground and sold. The remaining lead in the crude product may be converted into the lead monoxide by stirring the molten mass in presence of air for several hours. The hot product is then cooled rapidly to a temperature below 300°C to prevent any formation of lead tetroxide, Pb3O4. In an alternate process, a variation of the above method, molten lead is atomized in a shaft furnace. An air stream carries the very finely divided metal into the hot zone of the shaft furnace where the metal evaporates and oxidizes producing very finely divided lead monoxide. The product is passed through the cold zone of the furnace and cooled rapidly. The product obtained is a yellow powdery material, the beta form of lead oxide, massicot, consisting of orthorhombic crystals. The red lead oxide (the tetragonal alpha modification) is obtained by slow cooling of the lead monoxide melt. The solidified mass may contain the red alpha form of the oxide resulting from slow cooling of the melt, under an outer layer of yellow beta form that may result from the rapid cooling of the outer portion. Lead monoxide also is produced by a modified Ball Mill process in which high purity lead balls placed in the mill are partially oxidized to produce black or grey oxide. Both the red and yellow form of the oxide may be prepared by alkaline dehydration of lead hydroxide, Pb(OH)2.
Reactivity Profile
Lead monoxide has weak oxidizing or reducing powers. Redox reactions can however still occur. The majority of compounds in this class are slightly soluble or insoluble in water. If soluble in water, then the solutions are usually neither strongly acidic nor strongly basic. These compounds are not water-reactive. Aluminum carbide is oxidized with incandescence on warming with lead oxide, [Mellor, 1946, Vol. 5, 872]. Mixtures of lead oxide with aluminum powder(as with other metals: sodium, zirconium) give a violent explosions, [Mellor, 1946, Vol. 5, 217, 1941].
Health Hazard
General symptoms of lead poisoning (delayed). Inhalation or ingestion causes abdominal pain (lead colic), metallic taste in mouth, loss of weight, pain in muscles, and muscular weakness. Dust may irritate eyes.
Flammability and Explosibility
Notclassified
Purification Methods
Higher oxides are removed by heating under vacuum at 550o with subsequent cooling under vacuum. It is red at room temperature but becomes yellow at high temperatures (~480o) reversibly. [Ray & Ogg J Am Chem Soc 78 5994 1956, Kwestroo et al. J Inorg Nucl Chem 29 39 1967.]
Check Digit Verification of cas no
The CAS Registry Mumber 1317-36-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,3,1 and 7 respectively; the second part has 2 digits, 3 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 1317-36:
(6*1)+(5*3)+(4*1)+(3*7)+(2*3)+(1*6)=58
58 % 10 = 8
So 1317-36-8 is a valid CAS Registry Number.
InChI:InChI=1/O.Pb/q-2;+2
1317-36-8Relevant articles and documents
Dorko, E. A.,Glessner, J. W.,Ritchey, C. M.,Snyder, S. R.
, p. 18 - 23 (1984)
High resolution Fourier transform spectroscopy of the PbO molecule from investigation of the O2(1Δg)-Pb reaction
Martin, F.,Bacis, R.,Verges, J.,Bachar, J.,Rosenwaks, S.
, p. 889 - 898 (1988)
From the reaction of Pb with metastable oxygen O2(1Δg) in a Broida type oven we have analysed at high resolution some vibrational levels of the XO+, a1, AO+ and B1 states of the 208PbO molecule.The rotational parameters determined allowed us to recalculate the position of the various isotope lines to within 0.01 cm-1.We have found a negative value of οexe (-0.123(25)cm-1) in AO+, contrary to previous observations.The Ο type doubling in a1 varies from +1.8E-4 cm-1 (v'=2) to +2.3E-4 cm-1 (v'=9) and in B1 from -1.17E-4 (v'=0) to -0.97E-4 cm-1 (v'=2).
Infrared spectra of M(OH)1,2,4 (M = Pb, Sn) in solid argon
Wang, Xuefeng,Andrews, Lester
, p. 9013 - 9020 (2008/10/09)
Infrared absorptions for the matrix-isolated lead and tin hydroxides M(OH), M(OH)2 and M(OH)4 (M = Pb, Sn) were observed in laser-ablated metal atom reactions with H2O2 during condensation in excess argon. The major M(OH)2 product was also observed with H2 and O2 mixtures, which allowed the substitution of 18O2. The band assignments were confirmed by appropriate D2O2, D2, 16O 18O, and 18O2 isotopic shifts. MP2 and B3LYP calculations were performed to obtain molecular structures and to reproduce the infrared spectra. The minimum energy structure found for M(OH)2 has Cs symmetry and a weak intramolecular hydrogen bond. In experiments with Sn, HD, and O2, the internal D bond is favored over the H bond for Sn(OH)(OD). The Pb(OH)4 and Sn(OH)4 molecules are calculated to have S4 symmetry and substantial covalent character.
