Glycerol → Acrylic Acid

In the process for producing acrylic acid from glycerin via acrolein, it is preferred that: glycerin is introduced into a first reactor to conduct the dehydration reaction in the dehydration step; the acrolein-containing gas discharged from the first reactor is introduced into a condenser to be cooled at a pressure Pc lower than atmospheric pressure in the partial-condensation step; the purified gas discharged from the condenser is introduced into a second reactor to conduct the oxidation reaction of acrolein in the acrolein oxidation step; and the purified gas obtained by the partial-condensation step is introduced into the second reactor while acrolein contained in the purified gas remains in a gaseous state, wherein an inlet pressure of the second reactor is adjusted at a pressure Ps higher than the pressure Pc. When acrylic acid is produced from glycerin via acrolein in this manner, it becomes possible to efficiently produce acrylic acid while suppressing loss of acrolein due to polymerization of acrolein. For raising the pressure of the acrolein-containing gas, a pressure riser may be employed. Specifically, it is preferred that the pressure of the acrolein-containing gas is adjusted at the pressure Ps by introducing the purified gas discharged from the condenser into a pressure riser, followed by introducing an adjustment gas into the pressure riser or compressing in the pressure riser.

1. additionis introduced into a first reactor
2. customthe dehydration reaction in the dehydration step
3. additionis introduced into a condenser
4. temperatureto be cooled at a pressure
5. customlower than atmospheric pressure in the partial-condensation step
6. additionis introduced into a second reactor
7. customand the purified gas obtained by the partial-condensation step

ORD record

ord-ba9d2b3a28ea4426942faecf8d08b8b2

Source dataset

uspto-grants-2016_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09422377B2