公开(公告)号：DE102016208652A1

公开(公告)日：2017-11-23

申请号：DE102016208652

申请日：2016-05-19

Applicant: BASF SE

Inventor： STEPHAN OSKAR ,  BARTHEL HOLGER ,  GRÜNEWALD GERALD

IPC: B01J20/30

Abstract: Die Erfindung betrifft eine Vorrichtung zum Kühlen und Rückbefeuchten von Superabsorberpartikeln, umfassend ein Gehäuse (19) mit zwei rotierenden Wellen (3, 5) mit Funktionselementen (7) zum Fördern und Durchmischen der Superabsorberpartikel, wobei die Funktionselemente (7) ineinandergreifen. Die Vorrichtung umfasst mindestens eine Lanze (17; 21) zur Wasserzugabe, die im Betrieb der Vorrichtung in die Superabsorberpartikel ragt.

公开(公告)号：EP3295102A1

公开(公告)日：2018-03-21

申请号：EP16717128

申请日：2016-04-15

Applicant: BASF SE

Inventor： GRÜNEWALD GERALD ,  FUNK RUEDIGER ,  WEISMANTEL MATTHIAS ,  POSSEMIERS KARL

IPC: F26B3/06 ,  C08J3/24 ,  F26B17/04 ,  F26B21/02 ,  F26B21/12

CPC classification number: F26B3/06 ,  B29B9/10 ,  B29B9/12 ,  C08F2/00 ,  C08F2/01 ,  C08F20/06 ,  F26B17/04 ,  F26B21/02 ,  F26B21/12

Abstract: The invention relates to a production method for producing water-absorbing polymer particles, wherein the production method comprises the following steps: polymerizing an aqueous monomer solution or suspension in order to produce an aqueous polymer gel, drying the aqueous polymer gel in a belt dryer having a conveyor belt, the aqueous polymer gel being accommodated on the conveyor belt and the polymer gel being conveyed on the conveyor belt in a conveying direction (C), fracturing and/or grinding the dried polymer gel in order to form water-absorbing polymer particles. According to the invention, in order to perform drying: the belt dryer is formed having a dryer structure (101) largely encompassing the conveyor belt and having an air return guide (350) that connects to the dryer structure (101) in such a way that air is returned, wherein return air (RL) is drawn from the dryer structure (101) and is fed back to the dryer structure (101) via the air return guide (350), and the air return guide (350) has an air-drawing guide (340), which is formed between an input segment (EA) at the dryer structure (101) arranged upstream in the direction of air flow and an output segment (AA) in the air return guide (350) arranged downstream in the direction of air flow,
characterized in that a flow cross-section in at least one air-removing segment (A, A1, A2, A3, A4) of the air-drawing guide (340) has a cross-section enlargement (Q, Q1, Q2, Q3, Q4), wherein the cross-section enlargement enlarges a cross-section of the air-removing segment (A, A1, A2, A3, A4) of the air-drawing guide in such a way that at least in the air-removing segment (A, A1, A2, A3, A4) of the air-drawing guide (340), the return air (RL) is led away at a reduced flow velocity, in particular at a reduced flow velocity that is lower than at a cross-section of the air-drawing line arranged upstream in the direction of air flow and/or than an input velocity at the input segment (EA), and/or at least in an input segment (EA) of the air-drawing guide (340) having an enlarged cross-section, the return air (RL) is led away at a reduced input velocity, in particular at a reduced flow velocity that is lower than at a cross-section of the air-drawing line arranged downstream in the direction of air flow.

公开(公告)号：EP3295101A1

公开(公告)日：2018-03-21

申请号：EP16719309

申请日：2016-04-15

Applicant: BASF SE

Inventor： GRÜNEWALD GERALD ,  FUNK RUEDIGER ,  WEISMANTEL MATTHIAS

IPC: F26B3/04 ,  C08F6/00 ,  F26B5/04 ,  F26B17/04

CPC classification number: F26B3/04 ,  C08F2/10 ,  C08F6/008 ,  C08F20/06 ,  F26B5/041 ,  F26B17/04

Abstract: Production process for producing water-absorbent polymer particles, wherein the production process comprises the following steps: - polymerizing (S1) an aqueous monomer solution or suspension to produce an aqueous polymer gel (S2), - drying (S3) the aqueous polymer gel in a belt dryer with a conveyor belt (400), involving receiving the aqueous polymer gel on the conveyor belt (400) and conveying the polymer gel on the conveyor belt (400) in a conveying direction (C) of the conveyor belt (400), - crushing and/or grinding (S4) the dried polymer gel into water-absorbent polymer particles, wherein, for the drying (S3): - the belt dryer has a dryer structure (101), in the internal space (101i) of which the conveyor belt (400) is run. According to the invention, it is provided that - drying air is circulated in the internal space (101i) of the dryer structure (101) in counterflow (C') to the conveying direction (C) and the internal space of the dryer structure (101) is kept largely, preferably completely, at a negative pressure (p_U) with respect to the ambient pressure (p_A) in the external space of the dryer structure (101), and the internal space (101i) has and/or forms a pressure zone (DZ), in particular is divided into a number of pressure zones (DZ), wherein, along the conveying direction (C): - a first internal pressure is formed as an inlet pressure at a polymer gel inlet (100A) in at least one of the pressure zones (DZ) with a first pressure difference (ApA) in relation to an ambient pressure (p_A), and - a second internal pressure is formed as an outlet pressure at a polymer gel outlet (100B) in the at least one pressure zone (DZ) with a second pressure difference (ApB) in relation to an ambient pressure (p_A), wherein - the second pressure difference (ApB) is less than the first pressure difference (ApA).