Granted Patent B2

US 12,649,134 · App. 17/920,785 · Granted Jun 9, 2026

Inventors: Sebastian Marius Raupp (Ludwigshafen, DE); Sylvia Bertha (Ludwigshafen, DE); Andreas Daiss (Ludwigshafen, DE); Marco Krueger (Ludwigshafen, DE)

Assignee: BASF SE

B01J2/04C08F6/10

Abstract

Claims (26)

1 . An apparatus for producing a pulverulent product, comprising:

a device for dropletization of a liquid phase;

an addition point for a gas above the device for dropletization;

at least one gas withdrawal point on a circumference of the apparatus;

a solid withdrawal point; and

a tower shell between the device for dropletization and the gas withdrawal point;

wherein:

the apparatus comprises, above the solid withdrawal point, a decreasing diameter region;

at least a part of the decreasing diameter region decreases in hydraulic diameter toward the solid withdrawal point;

the decreasing diameter region has a maximum hydraulic diameter greater than a mean hydraulic diameter of the tower shell;

the tower shell projects into the decreasing diameter region such that an annular duct is formed between a part of the tower shell projecting into the decreasing diameter region and an upper part of the decreasing diameter region;

the at least one gas withdrawal point is disposed in the annular duct; and

the part of the tower shell projecting into the decreasing diameter region and forming an inner wall of the annular duct is made at least partly of a gas permeable material.

2 . The apparatus according to claim 1 , wherein the gas permeable material is a metal braid, a woven fabric, a netting, a grid material or a mesh material.

3 . The apparatus according to claim 1 , wherein the gas permeable material has a mesh size in the range from 0.5 μm to 5 mm.

4 . The apparatus according to claim 1 , wherein the part of the tower shell projecting into the decreasing diameter region and forming the inner wall of the annular duct is made of the gas permeable material in regions where the gas withdrawal points are positioned.

5 . The apparatus according to claim 1 , wherein the part of the tower shell projecting into the decreasing diameter region and forming the inner wall of the annular duct has a lower part which is made of the gas permeable material and an upper part which is made of a same material as a part the tower shell not projecting into the decreasing diameter region.

6 . The apparatus according to claim 5 , wherein the ratio of a height of the upper part to a height of the lower part is in a range from 0 to 3.

7 . The apparatus according to claim 1 , wherein the part of the tower shell projecting into the decreasing diameter region and forming the inner wall of the annular duct is completely made of the gas permeable material.

8 . The apparatus according to claim 1 , wherein an entrance into the annular duct is closed at least partially by the gas permeable material by connecting the gas permeable material to the end of the tower shell which projects into the region having at least partly a decreasing hydraulic diameter and to the region having at least partly a decreasing diameter.

9 . The apparatus according to claim 1 , wherein the gas permeable material is made of a plurality of segments which are joined together.

10 . The apparatus according to claim 1 , wherein the gas permeable material is made of at least one of stainless steel, chromium steel, bronze, brass, copper, natural fibers, carbon fibers, glass fibers, mineral fibers or a polymer.

11 . The apparatus according to claim 1 , wherein the decreasing diameter region has a constant hydraulic diameter at the upper part which forms an outer wall of the annular duct.

12 . The apparatus according to claim 1 , wherein a gas duct connects the gas withdrawal point and the addition point for gas.

13 . The apparatus according to claim 12 , wherein the gas duct comprises a gas conveying device.

14 . The apparatus according to claim 1 , wherein the pulverulent product is a poly(meth)acrylate.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (14)