This blog is
to explain the various steps required to process the dilute aqueous solution AA
to produce glacial acrylic acid. This treatment can be done on 10% to 80% of
acrylic acid with an entrainer, and the entrainer should be chemically inert
towards the acrylic acid.
- Ability to
capture atleast 3% of water from the aqueous acrylic acid solution
- A distillation
temperature difference of at least 5 degree C
- The Steps
involved in obtaining raw acrylic acid (~ 50% by weight) are:
- Treatment of
carbon monoxide with acetylene in the presence of catalyst.
acrylonitrile with aqueous of sulphuric acid
- Treating ethylene
cyanohydrin with aqueous solution of sulphuric acid
propylene with oxygen in the presence of a catalyst
a 99% acrylic acid needs a delicate and more difficult process.
producing raw acrylic acid, now it is the time to make it glacial, the normal
fractional crystallisation can provide us the solution because of eutectic at
63% acrylic acid by weight is precipitated.
process overcomes the foregoing disadvantages.
is used, it has the ability to capture water prederably by 7% by weight.
Examples of entrainers are benzene, toluene, esters of acrylic and methacrylic
acids, acrylonitrile, monochlorobenzene, carbon tetrachloride,
orthodichlorobenze and so on.
The image below explains the process in
Claude Tcherkawsky, Saint-Avold, Moselle, France,Aassignor to Societe
d'Electro-Chimie, d'Electro Metallurgie et des Acieries Electriques
d'Uglne,Paris, France, a corporation of FranceFiled Mar. 18, 1964, Ser. No.
352,829 Claims priority, application France, Mar. 21, 1963,