Method for hydrolysing acetone cyanohydrin
The present invention relates to a process for hydrolysis of acetone cyanohydrin (ACH) by means of sulphuric acid within the ACH sulpho process for preparation of methacrylic acid (MAA) or methyl methacrylate (MMA).
1. A process for hydrolysis of acetocyanohydrin, the process comprising:
preparing methyl methacrylate in a loop reactor by using sulphuric acid as a precursor,
wherein
at least one heat exchanger present in the loop reactor is equipped with turbulators,
at least one reaction component is fed into the loop reactor via a metering ring, which is installed externally and immediately upstream of a pump with a pump housing in the loop reactor,
the at least one heat exchanger equipped with turbulators is positioned downstream of a metered addition of sulphuric acid and of acetocyanohydrin in flow direction, and
the turbulators are turbulators with 100-1200 turns/m.
2. The process according to claim 1 , wherein the metering ring is integrated into the pump housing.
3. The process according to claim 1 , wherein corkscrew or piperbrush structures are installed as turbulators into the at least one heat exchanger.
4. The process according to claim 1 , wherein helically wound metal tapes are used on turbulators in the loop reactor.
5. The process according to claim 1 , wherein
the at least one heat exchanger is a shell-and-tube heat exchanger, and
at least 50-70% of tubes of the shell-and-tube heat exchanger are equipped with turbulators.
6. The process according to claim 1 , wherein the turbulators are turbulators with 500-750 turns/m.
7. The process according to claim 1 , wherein the turbulators are turbulators with 300-900 turns/m.