Device for producing poly(meth)acrylate in powder form

Patent metadata

Field	Value
Publication number	US-10683371-B2
Application number	US-201615773591-A
Country	US
Kind code	B2
Filing date	Nov 15, 2016
Priority date	Nov 17, 2015
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

The invention relates to 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. The apparatus for product discharge comprises a discharge apparatus, with a backup segment (39) disposed above the discharge apparatus.

First claim

The invention claimed is:

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.

Assignees

• Basf Se

Inventors

• Krueger Marco
• Possemiers Karl
• Gruenewald Gerald
• Freiberg Juergen
• Muehl Markus

Classifications

• B01J2/04 Primary

  in a gaseous medium {(if combined with suspending the material in a gas, e.g. fluidised beds B01J2/16)} · CPC title

• C08F2/34

  Polymerisation in gaseous state · CPC title

• B01J19/24

  Stationary reactors without moving elements inside (B01J19/08, B01J19/26 take precedence; with stationary particles B01J8/02) · CPC title

• B01J2219/00414

  using suction · CPC title

• C08F20/18

  with acrylic or methacrylic acids · CPC title