Patent · US Active

Apparatus for the production of water absorbing polymers

US9238215B2 · kind B2 · utility

2Cited by

11References

6Claims

0Family size

Assignee

BASF SE

Inventors

Matthias Weismantel · Bad Orb, DE
Stefan Bruhns · Mannheim, DE
Dominicus van Esbroeck · Nanjing, CN

Key dates

Filing date	Oct 25, 2013
Grant date	Jan 19, 2016
Priority date	—
Expiry date	Jun 29, 2034

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF26B21/06
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

An apparatus for producing a water-absorbing polymer by polymerizing a monomer solution and drying the resulting hydrogel by means of a heated gas stream through effecting the drying in two or more temperature zones. A gas stream is flowed against the hydrogel upwardly in the upstream sector of the belt dryer and downwardly in the downstream sector of the belt dryer, the direction of flow being reversed at a water content of 15% to 45% by weight for the hydrogel. The hydrogel layer is flowed against in a belt dryer upwardly to some extent at least, the gas velocity being 5% to 30% of the gas velocity required to lift the hydrogel off the belt, to produce hygiene articles.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.