Name: Methacrylic acid, MAA
Alias: 2-Methylpropenoic acid; 2-Methylacrylic acid
CAS No.: 79-41-4
Molecular formula: C4H6O2
Molecular weight: 86.09
Appearance: colorless crystal or transparent liquid with pungent odor
Production Method
There are two main industrial production methods for methacrylic acid, namely, acetone cyanohydrin method and isobutylene (tert-butanol) oxidation method.
1. ACH: Acetone cyanohydrin method Acetone and hydrocyanic acid are reacted in the presence of a base catalyst to form acetone cyanohydrin, which is then reacted with concentrated sulfuric acid to form methacrylamide sulfate, which is then hydrolyzed to form methacrylic acid. In production, acetone cyanohydrin and sulfuric acid are required to contain no water, otherwise acetone or methyl α-hydroxyisobutyrate will remain in the product, which will affect the quality of the product. The methacrylic acid was produced by the acetone cyanohydrin method, and each ton of product consumed 898 kg of sodium cyanide (>87%), 1100 kg of acetone (98.5%), and 4080 kg of sulfuric acid (smoke).
2. C4: Isobutylene (tert-butanol) oxidation method Isobutylene is oxidized in two steps, the first step produces methacrolein, the second step produces methacrylic acid, and then rectified to obtain a qualified product.
Main application
1. An important intermediate for organic chemical raw materials and polymers. Its most important derivative, methyl methacrylate-produced plexiglass, can be used in windows for aircraft and civil construction, as well as buttons, solar filters and automotive lamp lenses; the coatings produced have superior suspension and rheology. And durable properties; the resulting binder can be used for bonding metals, leather, plastics and building materials; methacrylate polymer emulsions are used as fabric finishes and antistatic agents. In addition, methacrylic acid can also be used as a raw material for synthetic rubber. 2. Organic chemical raw materials and polymer intermediates for the manufacture of methacrylates (ethyl methacrylate, glycidyl methacrylate, etc.) and plexiglass. Also used in the manufacture of thermosetting coatings, synthetic rubber, fabric treatment agents, leather treatment agents, ion exchange resins, insulating materials, antistatic agents, and the like. It is a cross-linking monomer for the manufacture of acrylate solvent-based and emulsion-type adhesives to improve the bond strength and stability of the adhesive. 3. For organic synthesis and polymer preparation.
Security Information
• Packing level: II
• Hazard category: 8
• Customs code: 2916130010
• Dangerous goods transport code: UN 2531 8/PG 2
• WGK Germany: 1
• Hazard Category Code: R21/22; R35
• Safety instructions: S26-S36/37/39-S45
• RTECS number: OZ2975000
• Dangerous Goods Mark: C: Corrosive
HS code: 2916130010.
Specification:
Packaging & Transportation:
In polyethylene drums (net weight 200kg) or iso-tank.
Shelf Life: 6 months
Storage & Handling:
To avoid the sunlight in the storehouse; to control the temperature at 18℃to 40℃ (64-104 Fahrenheit degrees); to leave 4 inches wide channel around the venue; to supply enough oxygen among monomer (recommend to using greenhouse with water transfer system); to require to ventilate and oxygenate before out of the works and this measure is necessary during the transport; need to open the cap and ventilate before storing in the warehouse so as to have enough oxygen to make inhibitor working, avoiding the polymerization of MAA.
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