CAS 5343-92-0

An natural compound, colorless obvious liquid with a relative density of 0.971, soluble in natural solvents such as alcohols, ethers and ethyl acetate. 1,2-Pentanediol is the key uncooked cloth for the synthesis of the fungicide propiconazole.
Chinese Name: 1,2-Pentanediol
Chinese synonyms: pentylene glycol, α-n-pentylene glycol, α-n-pentanediol
English names and synonyms:
PENTANE-1,2-DIOL； PTD； pentyleneglycol； 1,2-pentanediol； 1,2-DIHYDROXYPENTANE； 1,2-PENTANEDIOL； 1,2 Pentandiol
CAS：5343-92-0
EINECS：226-285-3
MDL：MFCD00010736
Using 1-pentene, hydrogen peroxide and formic acid as uncooked materials, the molar ratio is 1:1.5:4. The response equilibrium combination is fashioned by way of the following procedure: slowly add 1-pentene and hydrogen peroxide (70%) to formic acid at 40~55 °C at the equal time, after addition, stir the combination at fifty five °C for 1 hour, pass into the circulation reactor, the reactor has a circulation pump and an overflow siphon, warmth to fifty five °C and circulate, then add 1-pentene and formic acid, brought by way of one addition tube, hydrogen peroxide is delivered from some other addition tube, at this time an exothermic response occurs, and the temperature is allowed to upward shove to 62~63 °C, These elements are introduced in accordance to a positive percentage and speed, the equilibrium operation is managed through the circulating steady temperature device, about 8h, the response stops, a massive quantity of 1,2-pentanediol formate is obtained, formic acid and water are eliminated by way of vacuum distillation, the residue bought is delivered to 25% NaOH answer for hydrolysis, solvent extraction desolubilization distillation is received to attain 1,2-pentanediol, the yield can attain 91%, m p.96~98 °C/1.3kPa.