Background and overview of preparation and application of di-n-butyl carbonate
Di-n-butyl carbonate (D-bromophenylboronic acid BC) is a colorless liquid with a large molecular weight (M=174.24), high flash point, and strong oxidation resistance. It can be used as a non-aqueous electrolyte. Fully improve the electrochemical stability of lithium batteries and battery safety. As an organic symmetrical dialkyl ester containing carbonyl and butyl groups, DBC can also be used as a carbonylation agent or alkylation reagent in organic synthesis. DBC is also considered as a phosgene substitute for polycarbonate synthesis. DBC can also react with organic amines to prepare N-substituted organic carbamates. Further thermal cracking of organic carbamates can achieve a non-phosgene route to prepare organic isocyanates. In this process, DBC serves as a carbonyl source and alkylation reagent. It has the characteristics of green safety. In addition, DBC can also be used as a base material for lubricants, metal degreasing, leather treatment and other industries, and as a solvent for expanded polystyrene.
Preparation and application of di-n-butyl carbonate
The implementation process of a method for preparing di-n-butyl carbonate by alcoholysis of urea is as follows: adding a metal oxide catalyst, urea and n-butanol to a high-pressure reaction kettle, then purging the air in the reaction kettle with nitrogen, and adjusting the purge gas The flow rate of nitrogen or carbon dioxide is 20-200L/kg urea·hour. In the first stage, the temperature is raised to 130-150°C and the reaction is 2-6h. Then the temperature is raised to 180-220°C and the reaction is 10-20h. At the end of the reaction, after the reaction liquid is cooled, the catalyst is separated and recovered through sedimentation or rubidium carbonate filtration. The resulting catalyst can be reused after being simply washed and dried with ethanol or acetone. After the reaction, the product was analyzed qualitatively and quantitatively by gas chromatography (GC) and GC-MS. Due to their large boiling point differences, n-butanol, DBC and NBBC can be easily separated through vacuum distillation at different temperatures, that is, n-butanol can be separated and recovered under reduced pressure at 50 to 70°C, and n-butanol can be recovered at 90 to 110°C. DBC (containing 99.0%.
Preparation and application of di-n-butyl carbonate
CN201310366702.7 reports a stretch-resistant and wear-resistant floor material. The floor material is composed of the following components according to weight ratio: 21 to 24 parts of glycidyl butyrate, 15 to 16 parts of silicon carbide powder, 2 Manganese oxide powder is 11 to 12 parts, resorcinol formaldehyde resin is 2 to 3 parts, di-n-butyl carbonate is 4 to 6 parts, sodium petroleum sulfonate is 6 to 8 parts, and cyclooctatetraene is 1 to 2 parts . The prepared floor material has good tensile resistance and wear resistance.
CN201610406813. 15-20 parts of 0.5mm quartz sand, 11-20 parts of manganese dioxide powder, 15-20 parts of 25 mesh white diamond crystal, 8-10 parts of 0.5mm sand grains, 7-9 parts of activated oyster shell powder, 15-25 parts of white cement , 2-4 parts of 10-20mm alkali-resistant glass fiber, 0.1-0.3 parts of polycarboxylate water-reducing agent; the connecting layer includes the following components by weight: 7-9 parts of activated oyster shell powder, glycidyl butyrate 10-20 parts of ester, 15-25 parts of manganese dioxide powder, 1-5 parts of resorcinol-formaldehyde resin, 2-4 parts of di-n-butyl carbonate, and 6-8 parts of sodium petroleum sulfonate; the invention makes homemade crystal Brightener, after spraying, the floor will have a bright luster, anti-slip, waterproof, stain resistance and good durability.
References
[1] CN201010551633.3 A synthesis method of di-n-butyl carbonate
[2] CN201310366702.7 A stretch-resistant and wear-resistant floor material
[3] CN201610406813.X A kind of floor for construction
