EP1996493A2 - Method for the pneumatic conveying of water-absorbent polymer particles - Google Patents
Method for the pneumatic conveying of water-absorbent polymer particlesInfo
- Publication number
- EP1996493A2 EP1996493A2 EP07712458A EP07712458A EP1996493A2 EP 1996493 A2 EP1996493 A2 EP 1996493A2 EP 07712458 A EP07712458 A EP 07712458A EP 07712458 A EP07712458 A EP 07712458A EP 1996493 A2 EP1996493 A2 EP 1996493A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- polymer particles
- water
- pneumatic conveying
- conveying
- less
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/66—Use of indicator or control devices, e.g. for controlling gas pressure, for controlling proportions of material and gas, for indicating or preventing jamming of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/04—Bulk
- B65G2201/042—Granular material
Definitions
- the present invention relates to processes for the pneumatic conveying of water-absorbing polymer particles, wherein the initial gas velocity in the promotion of 1 to 6 m / s and the winninggutbeladung of 1 to 100 kg / kg.
- Water-absorbing polymers are, in particular, polymers of (co) polymerized hydrophilic monomers, graft (co) polymers of one or more hydrophilic monomers on a suitable graft base, crosslinked cellulose or starch ethers, crosslinked carboxymethylcellulose, partially crosslinked polyalkylene oxide or natural products swellable in aqueous liquids, such as guar derivatives.
- Such polymers are used as aqueous solution-absorbing products for the production of diapers, tampons, sanitary towels and other hygiene articles, but also as water-retaining agents in agricultural horticulture.
- Water-absorbing polymers typically have a centrifuge retention capacity of 25 to 60 g / g, preferably of at least 30 g / g, preferably of at least 32 g / g, more preferably of at least 34 g / g, most preferably of at least 35 g /G.
- Centrifuge retention capacity is determined according to the EDANA (European Disposables and Nonwovens Association) recommended test method no. 441.2-02 "Centrifuge retention capacity".
- water-absorbing polymers are described, for example, in "Modern Superabsorbent Polymer Technology", F.L. Buchholz and AT. Graham, Wiley-VCH, 1998, pages 69 to 17.
- water-absorbing polymer particles are transported by means of pneumatic conveying systems. The inevitably occurring mechanical stress leads to undesirable abrasion. Therefore, low transport speeds and thus reduced mechanical loads should be strived for.
- Dense flow conveying (plug conveying, impulse delivery) with high pressure loss.
- JP-A-2004/345804 describes the dense phase conveying of water-absorbing polymer particles, with delivery gas additionally being metered from the outside into individual segments of the delivery line (secondary air).
- the object of the present invention was to provide an improved process for the pneumatic delivery of water-absorbing polymer particles, wherein in particular the complex use of secondary air via an external additional line is avoided.
- the object has been achieved by a process for the pneumatic conveying of water-absorbing polymer particles, characterized in that the gas initial velocity in the conveying of 1 to 6 m / s and the winninggutbeladung of 1 to 100 kg / kg.
- the gas initial rate in the delivery is preferably 1.5 to 6 m / s, particularly preferably 2 to 5 m / s, very particularly preferably 3 to 4 m / s, and when using a fluid thrust line preferably 2 to 6 m / s. s, more preferably from 3 to 5.5 m / s, most preferably from 4 to 5 m / s.
- a fluid thrust line is an internal line with injection points, for example every 500 mm, through which an uncontrolled partial flow of the delivery gas can be led around the product flow plugs between the injection points (bypass). The penetration of conveyed material into the fluid thrust line is prevented by baffles.
- the randomlygutbeladung the pneumatic conveying is preferably from 1 to 100 kg / kg, more preferably from 5 to 75 kg / kg, most preferably from 10 to 50 kg / kg, wherein the baingutbeladung is the quotient of baingutmassenstrom and gas mass flow.
- the diameter of the pipeline, in which the pneumatic conveying is carried out is preferably from 3 to 30 cm, more preferably from 4 to 25 cm, most preferably from 5 to 20 cm. Too low pipe diameters lead to a higher mechanical load due to the pneumatic conveying and thus promote the undesirable abrasion. Too large a pipe diameter allow an equally undesirable settling of the water-absorbing polymer particles in the delivery line.
- the diameter of the conveying line is preferably stepped at least once in size. This applies above all to long conveyor lines. Preferably, there are several gradations of the pipe diameter. In the most preferred embodiment of the present invention, conical delivery lines are used.
- the delivery line can additionally be equipped with vibrators and / or knockers (vibration-induced pneumatic delivery).
- the pressure in the delivery line is preferably from -0.8 to 10 bar relative to the environment.
- the pressure feed can be operated with higher loads than the suction, since the pressure reserves in the overpressure are greater than in a vacuum and there with increasing pressure the
- Delivery gas density which drives the product increases.
- the pressure in the delivery line relative to the environment is therefore particularly preferably from 0.5 to 6 bar, most preferably from 1 to 4 bar.
- a pipeline in a pneumatic Conveying system is the section between the feeding device for the water-absorbing Polymer particles and the receiving container, ie the area in which the water-absorbing polymer particles are transported in the gas stream.
- the water content of the water-absorbing polymer particles is preferably less than 10 wt .-%, more preferably less than 5 wt .-%, most preferably from 1 to 5 wt .-%, wherein the water content according to the EDANA (European Disposables and Nonwovens Association) recommended test method No. 430.2-02 "Moisture content" is determined.
- the mechanical stability of the water-absorbing polymer particles decreases with the water content, i. the unwanted abrasion increases. Too high water contents during the pneumatic conveying can lead to the plastic deformation of the polymer particles (angel hair formation) or to blockages.
- the water-absorbing polymer particles preferably have at least 90% by weight, a particle diameter of less than 1000 ⁇ m, particularly preferably at least 95% by weight, a particle diameter of less than 900 ⁇ m, very particularly preferably at least 98% by weight, a particle diameter of less than 800 ⁇ m, up.
- the mechanical load during the pneumatic conveying is reduced so far that the proportion of polymer particles with a particle diameter of less than 150 microns by the pneumatic conveying preferably by less than 1 wt .-%, more preferably by less than 0.7 Wt .-%, most preferably by less than 0.5 wt .-%, each based on the total amount of polymer particles, is increased and the permeability of the polymer particles by the pneumatic conveying preferably by less than 5x10 "7 cm 3 s / g , more preferably less than 4x10 "7 cm 3 s / g, most preferably less than 3x10" 7 cm 3 sec / g, decreases.
- the water-absorbing polymer particles which can be used in the process according to the invention can be obtained by polymerization of a monomer solution containing
- Suitable monomers a) are, for example, ethylenically unsaturated carboxylic acids, such as acrylic acid, methacrylic acid, maleic acid, fumaric acid and itaconic acid. Particularly preferred monomers are acrylic acid and methacrylic acid. Especially preferred is acrylic acid.
- the proportion of acrylic acid and / or salts thereof in the total amount of monomers a) is preferably at least 50 mol%, particularly preferably at least 90 mol%, very particularly preferably at least 95 mol%.
- Tocopherol is understood as meaning compounds of the following formula
- R 1 is hydrogen or methyl
- R 2 is hydrogen or methyl
- R 3 is hydrogen or methyl
- R 4 is hydrogen or an acid radical having 1 to 20 carbon atoms.
- Preferred radicals for R 4 are acetyl, ascorbyl, succinyl, nicotinyl and other physiologically acceptable carboxylic acids.
- the carboxylic acids can be mono-, di- or tricarboxylic acids.
- R 4 is particularly preferably hydrogen or acetyl. Especially preferred is RRR-alpha-tocopherol.
- the monomer solution preferably contains at most 130 ppm by weight, more preferably at most 70 ppm by weight, preferably at least 10 ppm by weight, more preferably at least 30 ppm by weight, particularly preferably around 50 ppm by weight, hydroquinone hemether, in each case acrylic acid, wherein acrylic acid salts are calculated as acrylic be taken into account with acid.
- acrylic acid having a corresponding content of hydroquinone half-ether can be used.
- the water-absorbing polymers are crosslinked, i. the polymerization is carried out in the presence of compounds having at least two polymerisable groups which can be radically copolymerized into the polymer network.
- Suitable crosslinkers b) are, for example, ethylene glycol dimethacrylate, diethylene glycol diacrylate, allyl methacrylate, trimethylolpropane triacrylate, triallylamine, tetraallyloxyethane, as described in EP-A-0 530 438, di- and triacrylates, as in EP-AO 547 847, EP-A-0 559 476, EP-AO 632 068, WO-A-93/21237, WO-A-03/104299, WO-A-03/104300, WO-A-03/104301 and DE-A-10331450, mixed acrylates which contain, in addition to acrylate groups ethylenically unsaturated groups, as described in DE-A-103 31 456 and DE-A
- Suitable crosslinkers b) are in particular N, N'-methylenebisacrylamide and N 1 N'-methylenebismethacrylamide, esters of unsaturated mono- or polycarboxylic acids of polyols, such as diacrylate or triacrylate, for example butanediol or
- Ethylene glycol diacrylate or methacrylate and also trimethylolpropane triacrylate and allyl compounds such as allyl (meth) acrylate, triallyl cyanurate, maleic acid diallyl esters, polyallyl esters, tetraallyloxyethane, triallylamine, tetraallylethylenediamine, allyl esters of phosphoric acid and vinylphosphonic acid derivatives, as described, for example, in EP-A-0 343 427.
- crosslinkers b) are pentaerythritol di-, pentaerythritol tri- and pentaerythritol tetraallyl ethers, polyethylene glycol diallyl ether, ethylene glycol diallyl ether, glycerol and glycerol triallyl ethers, polyallyl ethers based on sorbitol, and ethoxylated variants thereof.
- Useful in the process according to the invention are di (meth) acrylates of polyethylene glycols, where the polyethylene glycol used has a molecular weight between 300 and 1000.
- crosslinkers b) are di- and triacrylates of 3 to 20 times ethoxylated glycerol, 3 to 20 times ethoxylated trimethylolpropane, 3 to 20 times ethoxylated trimethylolethane, in particular di- and triacrylates of 2 to 6-times ethoxylated glycerol or trimethylolpropane, the 3-fold propoxylated glycerol or trimethylolpropane, and the 3-times mixed ethoxylated or propoxylated glycerol or trimethylolpropane, 15-ethoxylated glycerol or trimethylolpropane, as well as at least 40-times ethoxylated glycerol, trimethylolethane or trimethylolpropane.
- Very particularly preferred crosslinkers b) are polyethoxylated and / or propoxylated with acrylic acid or methacrylic acid to di- or triacrylates Glycerines as described for example in DE-A-103 19 462. Particularly advantageous are di- and / or triacrylates of 3- to 10-fold ethoxylated glycerol. Very particular preference is given to diacrylates or triacrylates of 1 to 5 times ethoxylated and / or propoxylated glycerol. Most preferred are the triacrylates of 3 to 5 times ethoxylated and / or propoxylated glycerin.
- the amount of crosslinker b) is preferably 0.01 to 1 wt .-%, particularly preferably 0.05 to 0.5 wt .-%, most preferably 0.1 to 0.3 wt .-%, each based on the monomer a).
- Examples of ethylenically unsaturated monomers c) copolymerizable with the monomers a) are acrylamide, methacrylamide, crotonamide, dimethylaminoethyl methacrylate, dimethylaminoethyl acrylate, dimethylaminopropyl acrylate, diethylaminopropyl acrylate, dimethylaminobutyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, dimethylaminoneopentyl acrylate and dimethylaminoneopentyl methacrylate.
- water-soluble polymers d) it is possible to use polyvinyl alcohol, polyvinylpyrrolidone, starch, starch derivatives, polyglycols or polyacrylic acids, preferably polyvinyl alcohol and starch.
- Suitable reactors are kneading reactors or belt reactors.
- the polymer gel formed in the polymerization of an aqueous monomer solution is continuously comminuted by, for example, counter-rotating stirrer shafts, as described in WO-A-01/38402.
- the polymerization on the belt is described, for example, in DE-A-38 25 366 and US Pat. No. 6,241,928.
- Polymerization in a belt reactor produces a polymer gel which must be comminuted in a further process step, for example in a meat grinder, extruder or kneader.
- the hydrogel is advantageously still stored at elevated temperature, preferably at least 50 ° C., more preferably at least 70 ° C., very preferably at least 80 ° C., and preferably less than 100 ° C., for example in isolated form containers.
- the acid groups of the resulting hydrogels are usually partially neutralized, preferably from 25 to 95 mol%, preferably from 50 to 80 mol%, particularly preferably from 60 to 75 mol%, it being possible to use the customary neutralizing agents, preferably alkali metal hydroxides , Alkali metal oxides, alkali metal carbonates or alkali metal hydrogencarbonates and mixtures thereof.
- alkali metal salts and ammonium salts can be used.
- Sodium and potassium are particularly preferred as alkali metals, but most preferred are sodium hydroxide, sodium carbonate or sodium bicarbonate and their mixtures.
- the neutralization is preferably carried out at the stage of the monomers. This is usually done by mixing the neutralizing agent as an aqueous solution, as a melt, or preferably as a solid.
- the neutralizing agent for example, sodium hydroxide with a water content well below 50 wt .-% may be present as a waxy mass with a melting point above 23 ° C. In this case, a dosage as general cargo or melt at elevated temperature is possible.
- the hydrogel stage it is also possible to carry out the neutralization after the polymerization at the hydrogel stage. Furthermore, it is possible to neutralize up to 40 mol%, preferably 10 to 30 mol%, particularly preferably 15 to 25 mol%, of the acid groups before the polymerization by adding a part of the neutralizing agent already to the monomer solution and the desired final degree of neutralization only after the polymerization is adjusted at the level of the hydrogel. If the hydrogel is at least partially neutralized after the polymerization, the hydrogel is preferably comminuted mechanically, for example by means of a meat grinder, wherein the neutralizing agent can be sprayed, sprinkled or poured on and then thoroughly mixed in. For this purpose, the gel mass obtained can be further gewolfft for homogenization.
- the hydrogel is then preferably dried with a belt dryer until the residual moisture content is preferably below 15% by weight, in particular below 10% by weight, the water content being determined in accordance with the test method No. 430.2- recommended by EDANA (European Disposables and Nonwovens Association). 02 "Moisture content" is determined.
- a fluidized bed dryer or a heated ploughshare mixer can be used for drying.
- the dryer temperature must be optimized, the air supply and removal must be controlled, and it is in any case to ensure adequate ventilation. The drying is naturally simpler and the product is the whiter, if the solids content of the gel is as high as possible.
- the solids content of the gel before drying is therefore preferably between 30 and 80% by weight.
- Particularly advantageous is the ventilation of the dryer with nitrogen or another non-oxidizing inert gas.
- nitrogen or another non-oxidizing inert gas it is also possible simply to lower only the partial pressure of the oxygen during the drying in order to prevent oxidative yellowing processes.
- sufficient ventilation and removal of the water vapor also leads to an acceptable product.
- Advantageous in terms of color and product quality is usually the shortest possible drying time.
- the dried hydrogel is thereafter ground and classified, wherein for grinding usually one- or multi-stage roller mills, preferably two- or three-stage roller mills, pin mills, hammer mills or vibratory mills can be used.
- Suitable postcrosslinkers e) for this purpose are compounds which contain at least two groups which can form covalent bonds with the carboxylate groups of the polymers.
- Suitable compounds are, for example, alkoxysilyl compounds, polyaziridines, polyamines, polyamidoamines, di- or polyglycidyl compounds, as described in EP-AO 083 022, EP-A-543 303 and EP-A-937 736, polyhydric alcohols, as in DE-C No. 2,314,019, DE-C-35 23 617 and EP-A-450 922, or ⁇ -hydroxyalkylamides as described in DE-A-102 04 938 and US Pat. No.
- 6,239,230 are also suitable.
- compounds having mixed functionality such as glycidol, 3-ethyl-3-oxetanemethanol (trimethylolpropane oxetane), as described in EP-A-1 199 327, aminoethanol, diethanolamine, triethanolamine or compounds which form a further functionality after the first reaction such as ethylene oxide, propylene oxide, isobutylene oxide, aziridine, azetidine or oxetane.
- DE-A-40 20 780 cyclic carbonates, in DE-A-198 07 502 2-oxazolidone and its derivatives, such as N- (2-hydroxyethyl) -2-oxazolidone, in DE-A-198 07 992 Bis- and poly-2-oxazolidinone, in DE-A-198 54 573 2-oxotetrahydro-1,3-oxazine and its derivatives, in DE-A-198 54 574
- N-acyl-2-oxazolidones in DE-A-102 04 937 cyclic ureas, in DE-A-103 34 584 bicyclic amide acetals, in EP-A-1 199 327 oxetanes and cyclic ureas and in WO-A-03 / 031482 Morpholine-2,3-dione and its derivatives are described as suitable postcrosslinkers e).
- Preferred postcrosslinkers e) are oxazolidone and its derivatives, in particular N- (2-hydroxyethyl) -2-oxazolidone.
- the amount of postcrosslinker e) is preferably 0.01 to 1 wt .-%, particularly preferably 0.05 to 0.5 wt .-%, most preferably 0.1 to 0.2 wt .-%, each based on the polymer.
- the postcrosslinking is usually carried out so that a solution of the crosslinker e) is sprayed onto the hydrogel or the dry polymer particles. Subsequent to the spraying, it is thermally dried, whereby the postcrosslinking reaction can take place both before and during the drying.
- the spraying of a solution of the crosslinker is preferably carried out in mixers with agitated mixing tools, such as screw mixers, paddle mixers, disk mixers, plowshare mixers and paddle mixers.
- agitated mixing tools such as screw mixers, paddle mixers, disk mixers, plowshare mixers and paddle mixers.
- Vertical mixers are particularly preferred, plowshare mixers and display mixers are very particularly preferred.
- Suitable mixers are, for example, Lödige® mixers, Bepex® mixers, Nauta® mixers, Processall® mixers and Schugi® mixers.
- the thermal drying is preferably carried out in contact dryers, more preferably paddle dryers, very particularly preferably disk dryers.
- Suitable dryers are, for example, Bepex® T rockner and Nara® T rockner.
- fluidized bed dryers can also be used.
- the drying can take place in the mixer itself, by heating the jacket or blowing hot air. Also suitable is a downstream dryer, such as a hopper dryer, a rotary kiln or a heatable screw. However, it is also possible, for example, to use an azeotropic distillation as the drying process.
- Preferred drying temperatures are in the range 170 to 250 ° C, preferably 180 to 220 ° C, and particularly preferably 190 to 210 ° C.
- the preferred residence time at this temperature in the reaction mixer or dryer is preferably at least 10 minutes, more preferably at least 20 minutes, most preferably at least 30 minutes.
- the water-absorbing polymer particles can additionally be aftertreated with at least one polyvalent cation f).
- Suitable cations f) are, for example, divalent cations, such as the cations of zinc, magnesium, calcium and strontium, trivalent cations, such as the cations of aluminum, iron, chromium, rare earths and manganese, tetravalent cations, such as the cations of titanium and zirconium.
- chloride, bromide, sulfate, hydrogen sulfate, carbonate, bicarbonate, nitrate, phosphate, hydrogen phosphate, dihydrogen phosphate and carboxylate, such as acetate and lactate are possible.
- Aluminum sulfate is preferred.
- the multivalent cation f) is used as an aqueous solution.
- concentration of the polyvalent cation f) in the aqueous solution is for example 0.1 to 12 wt .-%, preferably 0.5 to 8 wt .-%, particularly preferably 1, 5 to 4 wt .-%.
- the amount of polyvalent cation f) is preferably 0.001 to 0.25 wt .-%, more preferably 0.005 to 0.2 wt .-%, most preferably 0.01 to 0.15 wt .-%, each based on the Polymer.
- the polyvalent cations f) are preferably applied during postcrosslinking, wherein postcrosslinker e) and cation f) are preferably metered in via separate solutions.
- the process according to the invention enables the reliable transport of water-absorbing polymer particles in the field of dense phase conveying.
- Measurements should be taken at an ambient temperature of 23 ⁇ 2 ° C and a relative humidity of 50 ⁇ 10%, unless otherwise specified.
- the water-absorbing polymer particles are thoroughly mixed before the measurement.
- LO is the thickness of the gel layer in cm
- d the density of the NaCl solution in g / cm 3
- A is the area of the gel layer in cm 2
- WP is the hydrostatic pressure over the gel layer in dynes / cm 2 .
- Polyethylene glycol 400 diacrylate (diacrylate of a polyethylene glycol having an average molecular weight of 400 g / mol) is used as the polyethylenically unsaturated crosslinker.
- the amount used was 2 kg per ton of monomer solution.
- the throughput of the monomer solution was 18 t / h.
- reaction solution had a temperature of 23.5 ° C. at the inlet.
- the reactor was operated at a shaft speed of 38rpm.
- the residence time of the reaction mixture in the reactor was 15 minutes.
- the aqueous polymer gel was applied to a belt dryer. In total, 18.3 t / h of aqueous polymer gel having a water content of 55% by weight were dried. The gel was applied from a height of 30 cm by means of a swivel tape on the conveyor belt of the dryer. The height of the gel layer was about 10 cm.
- the belt speed of the dryer belt was 0.02 m / s and the residence time on the dryer belt was about 37 minutes.
- the dried hydrogel was ground and sieved. The fraction with the particle size 150 to 800 microns was postcrosslinked.
- the postcrosslinker solution was sprayed onto the polymer particles in a Schugi® mixer.
- the postcrosslinker solution was a 1.2% strength by weight solution of ethylene glycol diglycidyl ether in propylene glycol / water weight ratio 1: 2). Based on the polymer particles 5 wt .-% solution were sprayed. It was then dried for 60 minutes at 150 ° C. and postcrosslinked.
- the delivery line used was a smooth aluminum pipeline with a length of 153 m and an internal diameter of 108.5 mm.
- the delivery line consisted of two horizontal and two vertical sections, the sections being connected by arches. The vertical elevation totaled 10 m.
- the conveying capacity was 5,800 kg / h of water-absorbing polymer particles, the conveying air amount was 320 kg / h and the gas velocity was 3.2 m / s on
- Delivery line was from +1,500 to 0 mbar, based on the ambient pressure.
- Transport load was 18 kg / kg and the Froude number at the beginning of the promotion was 3.1.
- the particle size distribution of the water-absorbing polymer particles (SAP) was determined by photo-optical detection. The results are summarized in Table 1.
- SAP water-absorbing polymer particles
- Example 2 The procedure was as in Example 1. The gas initial velocity was lowered over the conveying gas pressure to 1, 2 m / s.
- Example 2 The procedure was as in Example 1. The gas initial velocity was increased above the conveying gas pressure to 5.8 m / s.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Air Transport Of Granular Materials (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07712458A EP1996493A2 (en) | 2006-03-14 | 2007-03-06 | Method for the pneumatic conveying of water-absorbent polymer particles |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06111093 | 2006-03-14 | ||
PCT/EP2007/052088 WO2007104673A2 (en) | 2006-03-14 | 2007-03-06 | Method for the pneumatic conveying of water-absorbent polymer particles |
EP07712458A EP1996493A2 (en) | 2006-03-14 | 2007-03-06 | Method for the pneumatic conveying of water-absorbent polymer particles |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1996493A2 true EP1996493A2 (en) | 2008-12-03 |
Family
ID=38042481
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07712458A Ceased EP1996493A2 (en) | 2006-03-14 | 2007-03-06 | Method for the pneumatic conveying of water-absorbent polymer particles |
Country Status (5)
Country | Link |
---|---|
US (1) | US8651773B2 (en) |
EP (1) | EP1996493A2 (en) |
JP (1) | JP2009529478A (en) |
CN (1) | CN101400588B (en) |
WO (1) | WO2007104673A2 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1996494A1 (en) * | 2006-03-14 | 2008-12-03 | Basf Se | Method for the pneumatic conveying of water-absorbent polymer particles |
JP5611523B2 (en) | 2007-03-29 | 2014-10-22 | 株式会社日本触媒 | Particulate water-absorbing agent and method for producing the same |
JP5635397B2 (en) | 2008-03-13 | 2014-12-03 | 株式会社日本触媒 | Method for producing particulate water-absorbing agent mainly composed of water-absorbing resin |
EP2263957B1 (en) * | 2008-03-28 | 2013-02-13 | Nippon Shokubai Co., Ltd. | Method of transporting absorbent resin powder |
CN102378778A (en) | 2009-03-31 | 2012-03-14 | 株式会社日本触媒 | Process for producing particulate water-absorbing resin |
JP5871803B2 (en) | 2009-10-09 | 2016-03-01 | ビーエーエスエフ ソシエタス・ヨーロピアBasf Se | Post-humidification method for surface post-crosslinked water-absorbing polymer particles |
WO2011042468A2 (en) | 2009-10-09 | 2011-04-14 | Basf Se | Method for re-wetting surface post-cross-linked, water-absorbent polymer particles |
DE102010000706A1 (en) * | 2010-01-06 | 2010-10-14 | Basf Se | Conveying a stream of liquid containing methacrylic monomer using conveying pump through pipe line, in which an aperture is introduced at a position located in conveying direction of stream of liquid behind and/or above the conveying pump |
WO2011099586A1 (en) | 2010-02-10 | 2011-08-18 | 株式会社日本触媒 | Process for producing water-absorbing resin powder |
WO2011111856A1 (en) | 2010-03-12 | 2011-09-15 | 株式会社日本触媒 | Method for manufacturing a water-absorbing resin |
JP6991161B2 (en) | 2016-05-31 | 2022-01-13 | ビーエーエスエフ ソシエタス・ヨーロピア | Manufacturing method of superabsorbent |
JP6800998B2 (en) | 2016-11-16 | 2020-12-16 | 株式会社日本触媒 | Method for producing water-absorbent resin powder, and drying device and drying method for particulate hydrogel |
DE102017206842A1 (en) * | 2017-04-24 | 2018-10-25 | Coperion Gmbh | Method for pneumatic conveying of plastic granules |
US11161699B2 (en) * | 2019-06-18 | 2021-11-02 | Braskem America, Inc. | Solids conveying with multi-diameter piping circuit |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61106693U (en) | 1984-12-18 | 1986-07-07 | ||
JP2004345804A (en) | 2003-05-22 | 2004-12-09 | Nippon Shokubai Co Ltd | Transport method for water absorptive resin powder |
WO2004108795A1 (en) | 2003-06-06 | 2004-12-16 | Basf Aktiengesellschaft | (meth)acrylic ester for alkylenylene glycol and the use thereof |
Family Cites Families (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3384420A (en) * | 1966-08-02 | 1968-05-21 | Cargill Inc | Transfer system |
US3709562A (en) * | 1971-07-21 | 1973-01-09 | Wedco | Pneumatic conveyance system |
IT1084547B (en) * | 1977-09-30 | 1985-05-25 | Snia Viscosa | PROCEDURE AND EQUIPMENT FOR THE PRODUCTION OF SYNTHETIC POLYMERS WITH ADDITIVES. |
JPS5874424A (en) * | 1981-10-26 | 1983-05-04 | Lion Corp | Air lift |
DE3217406C2 (en) * | 1982-05-08 | 1986-06-05 | Pfister Gmbh, 8900 Augsburg | Device for continuous gravimetric dosing of loose material |
US4883390A (en) * | 1982-08-16 | 1989-11-28 | Petrocarb, Inc. | Method and apparatus for effecting pneumatic conveyance of particulate solids |
US4755178A (en) * | 1984-03-29 | 1988-07-05 | Minnesota Mining And Manufacturing Company | Sorbent sheet material |
IL82511A (en) * | 1986-05-28 | 1992-09-06 | Procter & Gamble | Apparatus for and methods of airlaying fibrous webs having discrete particles therein |
US4908175A (en) * | 1986-05-28 | 1990-03-13 | The Procter & Gamble Company | Apparatus for and methods of forming airlaid fibrous webs having a multiplicity of components |
US4927582A (en) * | 1986-08-22 | 1990-05-22 | Kimberly-Clark Corporation | Method and apparatus for creating a graduated distribution of granule materials in a fiber mat |
JPS6371021A (en) | 1986-09-13 | 1988-03-31 | Nitta Zerachin Kk | Low speed transporting method for granule |
US5230959A (en) * | 1989-03-20 | 1993-07-27 | Weyerhaeuser Company | Coated fiber product with adhered super absorbent particles |
US5102585A (en) * | 1990-01-09 | 1992-04-07 | Kimberly-Clark Corporation | Method for intermittently depositing particulate material in a substrate |
US5028224A (en) * | 1990-01-09 | 1991-07-02 | Kimberly-Clark Corporation | Apparatus for intermittently depositing particulate material in a substrate |
US5156902A (en) * | 1990-01-09 | 1992-10-20 | Kimberly-Clark Corporation | Method and apparatus for intermittently depositing particulate material in a substrate and article made therewith |
WO1991017200A1 (en) * | 1990-04-27 | 1991-11-14 | Nippon Shokubai Co., Ltd. | Method and apparatus for continuous granulation of high water absorbing resin powder |
CA2126240A1 (en) * | 1991-12-17 | 1993-06-24 | Paul Gaddis | Hopper blender system and method for coating fibers |
US5429788A (en) * | 1994-03-28 | 1995-07-04 | Kimberly-Clark Corporation | Apparatus and method for depositing particulate material in a composite substrate |
CN2287615Y (en) * | 1997-01-15 | 1998-08-12 | 山海关蔚海船舶机电有限公司 | Vacuum sand pump |
US6267575B1 (en) * | 1998-12-11 | 2001-07-31 | Kimberly Clark Worldwide, Inc. | Apparatus for the uniform deposition of particulate material in a substrate |
AUPP789898A0 (en) * | 1998-12-23 | 1999-01-21 | Birrus Engineering Pty Ltd | Conveying |
US6406745B1 (en) * | 1999-06-07 | 2002-06-18 | Nanosphere, Inc. | Methods for coating particles and particles produced thereby |
AU2001274511A1 (en) * | 2000-06-19 | 2002-01-02 | Bridgestone Corporation | Adsorbent, process for producing the same, and applications thereof |
US6727345B2 (en) * | 2001-07-03 | 2004-04-27 | Nippon Shokubai Co., Ltd. | Continuous production process for water-absorbent resin powder and powder surface detector used therefor |
DE10225943A1 (en) | 2002-06-11 | 2004-01-08 | Basf Ag | Process for the preparation of esters of polyalcohols |
MXPA04011457A (en) | 2002-06-11 | 2005-02-14 | Basf Ag | (meth)acrylic esters of polyalkoxylated trimethylolpropane. |
AU2003238476A1 (en) | 2002-06-11 | 2003-12-22 | Basf Aktiengesellschaft | (meth)acrylic esters of polyalkoxylated trimethylolpropane |
DE10358372A1 (en) | 2003-04-03 | 2004-10-14 | Basf Ag | Trimethylolpropane esters are useful for the production of cross-linked hydrogels, useful for the production of hygiene articles, packaging materials and non-wovens |
US7405321B2 (en) | 2003-06-06 | 2008-07-29 | Basf Aktiengesellschaft | (Meth)acrylic ester of alkenylene glycols and the use thereof |
CN1197751C (en) * | 2003-09-01 | 2005-04-20 | 上海博隆粉体工程有限公司 | Solid particle pneumatic transfer and blending device |
TW200720347A (en) * | 2005-09-30 | 2007-06-01 | Nippon Catalytic Chem Ind | Water-absorbent agent composition and method for manufacturing the same |
EP1840157B1 (en) * | 2006-03-27 | 2018-07-11 | Nippon Shokubai Co., Ltd. | Production method for water-absorbing resin composition |
US7973091B2 (en) * | 2006-12-20 | 2011-07-05 | E. I. Du Pont De Nemours And Company | Process for producing re-dispersable particles of highly fluorinated polymer |
US8603577B2 (en) * | 2007-03-19 | 2013-12-10 | Basf Se | Method for coating water-absorbing polymer particles |
JP5611523B2 (en) * | 2007-03-29 | 2014-10-22 | 株式会社日本触媒 | Particulate water-absorbing agent and method for producing the same |
SA08290542B1 (en) * | 2007-08-28 | 2012-11-14 | نيبون شوكوباي كو. ، ليمتد | Method for Producing Water Absorbent Resin |
US8633285B2 (en) * | 2007-12-17 | 2014-01-21 | Basf Se | Method for producing water-absorbing polymer particles |
JP5635397B2 (en) * | 2008-03-13 | 2014-12-03 | 株式会社日本触媒 | Method for producing particulate water-absorbing agent mainly composed of water-absorbing resin |
EP2263957B1 (en) * | 2008-03-28 | 2013-02-13 | Nippon Shokubai Co., Ltd. | Method of transporting absorbent resin powder |
JP4748403B2 (en) * | 2008-09-17 | 2011-08-17 | 富士ゼロックス株式会社 | Image forming apparatus |
US8481159B2 (en) * | 2009-09-04 | 2013-07-09 | Basf Se | Water-absorbent porous polymer particles having specific sphericity and high bulk density |
-
2007
- 2007-03-06 WO PCT/EP2007/052088 patent/WO2007104673A2/en active Application Filing
- 2007-03-06 CN CN200780009196.9A patent/CN101400588B/en not_active Expired - Fee Related
- 2007-03-06 JP JP2008558777A patent/JP2009529478A/en active Pending
- 2007-03-06 US US12/281,724 patent/US8651773B2/en not_active Expired - Fee Related
- 2007-03-06 EP EP07712458A patent/EP1996493A2/en not_active Ceased
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61106693U (en) | 1984-12-18 | 1986-07-07 | ||
JP2004345804A (en) | 2003-05-22 | 2004-12-09 | Nippon Shokubai Co Ltd | Transport method for water absorptive resin powder |
WO2004108795A1 (en) | 2003-06-06 | 2004-12-16 | Basf Aktiengesellschaft | (meth)acrylic ester for alkylenylene glycol and the use thereof |
Non-Patent Citations (1)
Title |
---|
See also references of WO2007104673A2 |
Also Published As
Publication number | Publication date |
---|---|
CN101400588B (en) | 2014-04-16 |
JP2009529478A (en) | 2009-08-20 |
CN101400588A (en) | 2009-04-01 |
US20090060660A1 (en) | 2009-03-05 |
WO2007104673A2 (en) | 2007-09-20 |
WO2007104673A3 (en) | 2007-11-22 |
US8651773B2 (en) | 2014-02-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1996493A2 (en) | Method for the pneumatic conveying of water-absorbent polymer particles | |
WO2007104676A1 (en) | Method for the pneumatic conveying of water-absorbent polymer particles | |
WO2007104657A2 (en) | Method for the pneumatic conveying of water-absorbent polymer particles | |
EP2305718B1 (en) | Method for producing water-absorbent polymers | |
EP1926754B1 (en) | Polymerization method | |
EP1926756B1 (en) | Polymerization method | |
EP1919609B1 (en) | Method for producing water-absorbing polymer particles | |
EP1931616B1 (en) | Neutralization method | |
EP1838463B1 (en) | Method for grading a particulate water-absorbing resin | |
EP1926758B1 (en) | Polymerization method | |
EP2137262B1 (en) | Method for coating water-absorbing polymer particles | |
EP1940766B1 (en) | Neutralization process | |
EP1965905B1 (en) | Method for the continuous mixing of polymer particles | |
EP2225284B2 (en) | Method for producing water-absorbing polymer particles | |
WO2009077376A1 (en) | Method for producing water-absorbent polymer particles | |
EP2129706A1 (en) | Method for coating water-absorbent polymer particles | |
DE102005058631A1 (en) | Continuous mixing of water-absorbent polymer with liquid, e.g. to make crosslinkable material for hygiene articles, involves using a rotating stirrer to give the particles an impetus against the product flow direction | |
DE102006006539A1 (en) | Continuously mixing water-absorbing polymer particles with liquids or other particles comprises propelling the material being mixed counter to the product flow direction by the rotation of mixing tools |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20081014 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR |
|
17Q | First examination report despatched |
Effective date: 20100804 |
|
DAX | Request for extension of the european patent (deleted) | ||
TPAC | Observations filed by third parties |
Free format text: ORIGINAL CODE: EPIDOSNTIPA |
|
APBK | Appeal reference recorded |
Free format text: ORIGINAL CODE: EPIDOSNREFNE |
|
APBN | Date of receipt of notice of appeal recorded |
Free format text: ORIGINAL CODE: EPIDOSNNOA2E |
|
APBR | Date of receipt of statement of grounds of appeal recorded |
Free format text: ORIGINAL CODE: EPIDOSNNOA3E |
|
APAF | Appeal reference modified |
Free format text: ORIGINAL CODE: EPIDOSCREFNE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R003 |
|
APBT | Appeal procedure closed |
Free format text: ORIGINAL CODE: EPIDOSNNOA9E |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
18R | Application refused |
Effective date: 20150528 |