REACTORS FOR PHTHALIC ANHYDRIDE, MALEIC ANHYDRIDE, FORMALDEHYDE MANUFACTURING PROCESSES Rollechim Reactors, as a result of over 50 years experience in phthalic anhydride, maleic anhydride and formaldehyde manufacturing plants, are conceived, designed and manufactured according to the most stringent safety and quality standards, suitable for the highest possible concentration of raw material in the feeding stream. The supply of Rollechim's Reactors can be either made in accordance to Customer's Specification Sheet or according to Rollechim's design and manufacturing standards, so achieving the state of the art in terms of fixed-bed catalyst Reactor' supply.

MAIN ADVANTAGES ON ROLLECHIM'S REACTOR TECHNOLOGY high compactness levels high easiness of assembling high easiness on catalyst filling optimized distribution of inlet feeding gas optimized salt flow circulation and patterns better salt bath temperature control better control amd management of the reaction longer catalyst life-time lower investment costs higher easiness in operation higher process safety

ROLLECHIM'S REACTORS TECHNOLOGY AT A GLANCE

Versatility:
- upper head has a self-opening cover; the opening of Reactor's top cover can be made without any particular device (such as cranes, etc.) so allowing an easy access and very quick operations on discharging/filling the catalyst;
- the inlet feeding gas chamber is designed with special baffles to keep the perfect mixing of the raw material into air stream and ensuring the most homegeneous feeding gas distribution on the entire surface of Reactor's tube-sheet;
- the salt circulation pump and the salt-cooler are installed inside the reactor, allowing a perfect circulation of the entire salt-bath mass, a better temperature control and a reduction of temperature stress in the material;
- suitable number of thermal resistances are placed in Reactor's perimetral area, allowing the salt-bath mass to always remain in molten state also during plant shut-downs, for a long time too, and avoiding in such a way uneconomical dead-times during re-start-up (in fact during the catalyst replacing operations, the salt mass discharging into external salt tank is totally avoided so reducing consistently the operation time on this activity and increasing the profitable nrmal operation of Reaction unit).

Safety:
- salts circulation inside Reactor is properly designed to eliminate the risk of preferential patterns between the tubes and to guarantee an optimum homogeneous distribution of the temperatures, that allows to operate at high loads (i.e. up to 100 g/Nm3 of o-Xylene concentration into air in PA process Reactors) with the maximum plant and process safety;
- safety passive devices (such as rupture disks), in case of run-away reactions, are calculated for the maximum possible raw material load and are placed both on the upper and in the lower heads;
- salt leakage indicators placed in the bottom head continuously check the possible presence of salt so avoiding dangerous situations;

- heads for maleic anhydride production Reactors are properly conceived and manufactured to reduce to the minimum all free volumes, so achieving the highest safety level against explosions.

STANDARD MODELS OF ROLLECHIM REACTORS FOR PHTHALIC ANHYDRIDE PRODUCTION

* Within above Rollechim can supply Reactors of any sizes and dimensions suitable for whatever capacity requested by the Customer
** Operation time 8,500 h/y, 112% w/w average plant yield, 90 g/Nm3 o-Xylene load into air have been taken into account