Device for producing poly(meth)acrylate in powder form

1. An apparatus for producing pulverulent poly(meth)acrylate, comprising a

reactor for droplet polymerization having an apparatus for dropletization of a monomer solution for the preparation of the poly(meth)acrylate having holes through which the monomer solution is introduced, an addition point for a gas above the apparatus for dropletization, at least one gas withdrawal point on the circumference of the reactor, a fluidized bed and an apparatus for product discharge from the fluidized bed, wherein the apparatus for product discharge comprises a discharge apparatus, with a backup segment disposed above the discharge apparatus, the backup segment serving as a gas barrier in that by accumulation of product a compaction results.

2. The apparatus according to claim 1 , wherein the backup segment has an upper sensor for detecting a maximum fill level and a lower sensor for detecting a minimum fill level.

3. The apparatus according to claim 2 , wherein a closed-loop fill level control system is included, in which the upper sensor detects a first upper fill level and, when the latter is attained, a feed is reduced, and detects a second upper fill level and, when the latter is attained, the feed is closed, and the lower sensor detects a first lower fill level and, when the latter is attained, the product flow out of the apparatus for product discharge is reduced, and detects a second lower fill level and, when the latter is attained, the apparatus for product discharge is closed, such that no product is withdrawn.

4. The apparatus according to claim 1 , wherein a closure element is disposed above the backup segment.

5. The apparatus according to claim 1 , wherein a solids comminutor is disposed above the backup segment.

6. The apparatus according to claim 5 , wherein the solids comminutor is a lump breaker.

7. The apparatus according to claim 6 , wherein the lump breaker is a finger breaker having a breaking grid and a rotating breaking tool.

8. The apparatus according to claim 1 , wherein the discharge apparatus is a star feeder, a flap, a screw conveyor or a segmented ball valve.

9. The apparatus according to claim 1 , wherein a gas supply is disposed in the backup segment in order to introduce gas into the backup segment.

10. The apparatus according to claim 1 , wherein the apparatus for product discharge is heatable.

11. The apparatus according to claim 10 , wherein the apparatus for product discharge is heated by virtue of a solids comminutor, the backup segment and/or the discharge apparatus having electrical heating, a jacket or externally mounted heating coils, it being possible for a heating medium to flow through the jacket or the heating coils.

12. The apparatus according to claim 1 , wherein the gas withdrawal point is connected to an apparatus for fine dust removal and the apparatus for fine dust removal has a solids discharge comprising a discharge apparatus and, above the discharge apparatus, a closure element.

13. The apparatus according to claim 12 , wherein the discharge apparatus from the solids discharge of the apparatus for fine dust separation is a star feeder, a flap, a conveying screw or a segmented ball valve.

14. The apparatus according to claim 12 , wherein the closure element in the solids discharge of the apparatus for fine dust separation is a flap, a slide vane, a segmented ball valve or another valve.

15. The apparatus according to claim 12 , wherein at least one fill level sensor is positioned above the closure element.

16. The apparatus according to claim 1 , wherein the apparatus for product discharge and/or the solids discharge of an apparatus for fine dust removal open(s) into a suction line which pneumatically conveys the pulverulent poly(meth)acrylate onward.