GB2040954A - Process for producing polyacrylic acid salt granules easily soluble in water - Google Patents
Process for producing polyacrylic acid salt granules easily soluble in water Download PDFInfo
- Publication number
- GB2040954A GB2040954A GB8001192A GB8001192A GB2040954A GB 2040954 A GB2040954 A GB 2040954A GB 8001192 A GB8001192 A GB 8001192A GB 8001192 A GB8001192 A GB 8001192A GB 2040954 A GB2040954 A GB 2040954A
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- GB
- United Kingdom
- Prior art keywords
- polyacrylic acid
- acid salt
- salt
- sprayed
- powder
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 51
- 150000003839 salts Chemical class 0.000 title claims abstract description 45
- 229920002125 Sokalan® Polymers 0.000 title claims abstract description 41
- 239000004584 polyacrylic acid Substances 0.000 title claims abstract description 41
- 239000008187 granular material Substances 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 9
- 239000007864 aqueous solution Substances 0.000 claims abstract description 14
- 238000005469 granulation Methods 0.000 claims abstract description 14
- 230000003179 granulation Effects 0.000 claims abstract description 14
- 239000004552 water soluble powder Substances 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims description 31
- 239000000843 powder Substances 0.000 claims description 17
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 12
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical group [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 12
- -1 alkali metal salt Chemical class 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 10
- 229910052783 alkali metal Inorganic materials 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052788 barium Inorganic materials 0.000 claims description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 159000000000 sodium salts Chemical group 0.000 claims description 2
- 150000003863 ammonium salts Chemical class 0.000 claims 3
- 150000001342 alkaline earth metals Chemical class 0.000 claims 1
- 238000006116 polymerization reaction Methods 0.000 claims 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 claims 1
- XQVWYOYUZDUNRW-UHFFFAOYSA-N N-Phenyl-1-naphthylamine Chemical compound C=1C=CC2=CC=CC=C2C=1NC1=CC=CC=C1 XQVWYOYUZDUNRW-UHFFFAOYSA-N 0.000 description 12
- 239000000523 sample Substances 0.000 description 10
- 238000004090 dissolution Methods 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000013068 control sample Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 150000003868 ammonium compounds Chemical class 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229920000609 methyl cellulose Polymers 0.000 description 2
- 239000001923 methylcellulose Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 208000008469 Peptic Ulcer Diseases 0.000 description 1
- 208000025865 Ulcer Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000002778 food additive Substances 0.000 description 1
- 235000013373 food additive Nutrition 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 239000012456 homogeneous solution Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 208000000689 peptic esophagitis Diseases 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 159000000001 potassium salts Chemical class 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000003516 soil conditioner Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 231100000397 ulcer Toxicity 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Medicinal Preparation (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- General Preparation And Processing Of Foods (AREA)
Abstract
Readily water soluble polyacrylic acid salt granules are prepared by a process in which a water-soluble powder of a polyacrylic acid salt is granulated by a fluidized bed granulation method while an aqueous solution of the polyacrylic acid salt of a viscosity of 50-700 c.p.s. is sprayed thereon.
Description
SPECIFICATION
Process for producing polyacrylic acid salt granules easily soluble in water
Water-soluble polyacrylic acid salts are now used widely as, for example, food additives such as thickening agent and emulsion stabilizer, aggregation or precipitation accelerator for industrial waste water, soil conditioner and cement additives. Recently, the water-soluble polyacrylic acid salts have been used as medicine in the treatment of peptic ulcers, particularly peptic esophagitis ulcer.
The water-soluble polyacrylic acid salts are obtained generally in the form of a gel polymer by the aqueous solution polymerization. Usually, the gel polymer is used in the form of powder obtained by drying the same and crushing it into particle size of about 1 00--200 mesh. In many cases, the powder is used in the form of an aqueous solution. However, in dissolving the powder in water to form the aqueous solution, undissolved lumps are frequently obtained. Further, finely divided particles contained in the powder are apt to be scattered during use and these particles tend to adhere to the surroundings in the workshop. The particles have an extremely high hygroscopicity and thus form a sticky extraneous matter to cause unfavourably environmental pollution in the workshop.
In order to overcome those defects, it has been proposed to crush the dried gel polymer into particles of 20-65 mesh (Tyler) for convenience in the use. However, according to this process, undissolved lumps are formed due to the large particle size and a considerably long period of time is required for the complete dissolution of the particles to form a homogeneous solution, since the particles are hard, though the dissolution time is still shorter than that required in case of using powder.
As processes for overcoming said defect, there have been known processes wherein sodium polyacrylate powder is kneaded with water or a hydrous, hydrophilic organic solvent and the mixture is then dried and then crushed or, alternatively, the mixture is granulated and then dried (Japanese Patent
Laid-Open No. 83681/1974) and wherein a powder of alkali metal salt of polyacrylic acid is contacted with water in a hydrophilic organic solvent and the resulting mass is dried and then crushed into aggregated granules (Japanese Patent Laid-Open No. 133:251/1975). However, according to those processes, particle size distribution of the product extends over a wide range from powder to granules and yield of particles of a high solubility (16-80 mesh) (Tyler) is as low as about 65%, since the mass once produced is crushed.Another defect of these processes is that the production operations are complicated. Said process disclosed in the specification of Japanese Patent Laid-Open No.
83681/1974 wherein the granules are obtained by granulating the kneaded mixture and then drying the same is not suitable for an industrial scale, since the granulation of the mixture is difficult.
According to the present invention, there is provided a process for producing water-soluble polyacrylic acid salt granules which process comprises granulating a water soluble powder of poiyacrylic acid salt using a fluidized bed granulatiqn method, while an aqueous solution of the polyacrylic acid salt of a viscosity of 50-700 c.p.s. is sprayed thereon.
The water-soluble powder of polyacrylic acid salts are not particularly limited. They include, for example, alkali metal salts such as sodium and potassium salts and salts with bases such as ammonium compounds of an average molecular weight of 500,000-10,000,000, preferably 2,000,000-10,000,000. Those salts may be partially replaced with other alkali metal salts or ammonium compounds, or with alkaline earth metal salts such as calcium, magnesium and barium or trivalent metals such as aluminum and iron.
As for particle size distribution, the salts have a particle size of 20-325 mesh (Tyler), preferably 48-200 mesh and an average particle diameter of 100--200 um, preferably 140-1 70 ym.
The polyacrylic acid salt to be sprayed is preferably the same compound as the polyacrylic acid salt to be granulated, the former being used in an amount of 0.3-1 g, preferably 0.35-0.8 g per kilogram of the latter. In case sodium polyacrylate is used, the amount thereof is preferably 0.35-0.5 g per kilogram of the latter. Viscosity of the aqueous solution of polyacrylic acid salt is 50-700 c.p.s., preferably 1 50-350 c.p.s.
The fluidized bed granulation device is not particularly limited and the device of any type such as fluidized bed type, modified fluidized bed type or jet bed type can be used.
In carrying out the granulation process according to the present invention, a powder of polyacrylic acid salt is fluidized in the fluidized bed granulating device, an aqueous solution of polyacrylic acid salt is sprayed thereon to form granules and then the granules are dried.
Granulation temperature is 4O800 C, preferably 45--700C.
The aqueous polyacrylic acid salt solution is sprayed for 5-90 seconds, preferably 10-80 seconds at intervals of longer than 3 seconds, preferably longer than 5 seconds.
Thus obtained granules are sieved to obtain the product of 1 6-80 mesh in a yield of about 95% or the product of 1 6-48 mesh in a yield of about 80%.
When a binder other than the polyacrylic acid salt was used, yield of the product of 1 6-80 mesh did not reach 95% even though the granulation conditions were varied.
The following experiments show that easily soluble granules of 16-80 mesh can be obtained in a high yield by the granulation process of the present invention.
Experiments:
Determination of particle size distribution (yield) of the granules: (1) Preparation of samples:
1 5.5 kilograms of sodium polyacrylate (hereinafter referred to as PANA) having an average molecular weight of 8,000,000, a particle size distribution of 48-1 50 mesh and an average particle diameter of 158 > m were granulated using 7.5 liters of an aqueous binder solution shown in Table 1 in the same manner as in Example 1 given below to obtain a sample.
TABLE 1
Conc. Viscosity Sample Binder (W/V %) (c.p.s.) Remarks A PANA of average 0.075 298 Sample of molecular weight the present of 8,000,000 invention B Polyvinyl 20.0 215 Control pyrrol idone -C Methylcellulose 6.0 304 D None (only water) - - I.
Aggregated granules prepared by the process described in Example 4 of Japanese Patent Laid
Open No. 133,251 were used as control sample E. Concrete method of the preparation was as follows: 1 Kilogram of PANA was added gradually to 11 liters of 30% aqueous ethanol under stirring. After stirring for about one hour, the mixture was filtered, dried and ground to obtain sample E.
(2) Method of experiment:
Each sample was sieved through sieves of 16, 48 and 80 mesh (Tyler). The sample remaining on the sieve after the sieving was weighed and yield of the product was calculated according to the following formula:
(Amount of granules remaining on the sieve)
(Amount of PANA charged) + (Amount of binder used) (3) Results of experiment:
The results are shown in Table 2.
TABLE 2
Particle size distribution Sample > 16 mesh | i6-48 mesh | 48-80 mesh | < 80 mesh A 1.7% 80.1% 14.6% 3.6% B 7.6 63.2 9.0 20.2 C 3.2 60.5 8.3 28.0 D 4.7 59.1 7.9 28.3 E 6.3 54.7 10.2 28.8 it is apparent from the results that yield of sample A of the present invention having a highly soluble particle size of 1 6-80 mesh is 94.7% and that of particularly highly soluble particle size of 1 6-48 mesh of 80.1%, while yields of control sample E prepared according to the method of Japanese
Patent Laid-Open No. 133,251/1975 were only 64.9% and 54.7%, respectively. Thus, yield of the product of particularly highly soluble particle size of 6-48 mesh was higher in the present invention by more than 40%.
Yields of control samples B and C prepared by using polyvinyl pyrrolidone and methylcellulose, respectively, as binder were only 63.2% and 60.5%, respectively for 16-48 mesh size, which yields were little different from yield of control sample D prepared by spraying only water (59.1%). On the other hand, yield of sample A prepared by using PANA as binder according to the present invention was as high as 80.1% which was higher than said yields of the control samples by more than 30%. This fact indicates superiority of PANA as blinder.
Further, the sample of the present invention contains a fraction of a particle size of smaller than 80 mesh having a poor solubility in an amount of only 3.6%, while control samples B-E contains said fraction in an amount of 20.228.8%. Thus, it is understood that the process of the present invention is more excellent from the granulation of easily water-soluble polyacrylic acid salts.
Following is a description by way of example only of methods of carrying the invention into effect.
EXAMPLE 1
15.5 Kilograms of PANA having a particle size distribution of 48-150 mesh, an average particle diameter of 1 58 time and an average molecular weight of 8,000,000 were charged in a fluidized bed granulation-drying device sWSG-1 SR (a product of Okawara Seisaku-sho). 7.4 Liters of 0.075 W/V% aqueous solution (298 c.p.s.) of PANA of the same molecular weight as above were sprayed on PANA fluidized at 500C at a feed rate of 120 ml./min. under a spray pressure of 5 Kg/cm2 to form granules. In the granulation, the spraying was effected for 20 seconds and then the whole was shaken for 5 seconds. These procedures were repeated in the initial stage (5 minutes). Thereafter, one minute spraying following by 5 second shaking was repeated.After completion of the granulation, the granules were dried at 1 400C for 6 hours and then classified by seiving with a gyrosifter to collect granules of 16-48 mesh. Yield was 80.1%. Dissolution time was 75 minutes which was equal to the solution time of aggregated granules produced by the process of Japanese Patent Laid-Open No. 133,251/1975.
Dissolution time of the starting powder of the granules was 320 minutes.
EXAMPLE 2
16.3 Kilograms of PANA powder having a particle size distribution of 48-200 mesh, an average particle diameter of 146 fllm and an average molecular weight of 5,900,000 were charged in the same device as in Example 1.8.1 Liters of 0.11 W/V% aqueous solution (311 c.p.s.) of PANA of the same molecular weight as above were sprayed on PANA fluidized at 55 OC at a feed rate of 100 ml./min.
under a spray pressure of 4.5 kg/cm2 to form granules. Methods of spraying, drying and sieving were the same as in Example 1. Thus, granules of 1 6-48 mesh were obtained. Yield was 82.7%. Dissolution time was 70 minutes.
EXAMPLE 3
1 5.1 Kilograms of a water-soluble powder of polyacrylic acid salts (in which 50% of the carboxyl groups is sodium salt and 50% thereof is aluminum salt) having a particle size distribution of 48-200 mesh, an average particle diameter of 145 ym and an average molecular weight of 7,800,000 were granulated by spraying 7.7 liters of 0.1 5 W/V% aqueous solution of the same polyacrylic acid salts (267 c.p.s.) thereon at a feed rate of 90 ml./min. in the same manner as in Example 1 to obtain granules of 1 6-48 mesh. Yield was 80.9%. Dissolution time was 65 minutes.
Granules of a higher solubility could be obtained by subjecting the easily water-soluble polyacrylic acid salt granules produced by the process of the present invention to the treatment with a waterinsoluble, water-permeable coating agent, i.e. semi-permeable coating agents, according to a coating method disciosed in the specification of U.S. Patent No. 4,150,110.
EXAMPLE 4
15 Kilograms of the granules produced in Example 1 were subjected to spray coating treatment with a coating solution comprising 5 parts of ethylcellulose, 1 part of glycerol/fatty acid ester (O.D.O. ap, a product of Nisshin Seiyu Kabushiki Kaisha), 47 parts of methanol and 47 parts of methylene chloride till weight of the solid matter increased by 900 g. Thus, granules of a higher solubility were obtained.
Dissolution time was 1 minute and 20 seconds.
Claims (23)
1. A process for producing water-soluble polyacrylic acid salt granules which process comprises granulating a water soluble powder of polyacrylic acid salt using a fluidized bed granulation method, while an aqueous solution of the polyacrylic acid salt of a viscosity of 50-700 c.p.s. is sprayed thereon.
2. A process as claimed in Claim 1 wherein the viscosity of the solution is 1 50-350 c.p.s.
3. A process as claimed in Claim 1 or Claim 2 wherein the aqueous solution of polyacrylic acid salt is sprayed for 5-90 seconds at intervals of longer than 3 seconds.
4. A process as claimed in Claim 1 or Claim 2 wherein the aqueous solution of polyacrylic acid salt is sprayed for 1 0--80 seconds at intervals of longer than 5 seconds.
5. A process as claimed in any preceding claim wherein amount of the polyacrylic acid salt to be sprayed is 0.3-1 g per kilogram of the polyacrylic acid salt to be granulated.
6. A process as claimed in any one of Claims 1 to 4 wherein amount of the polyacrylic acid salt to be sprayed is 0.35-0.8 g per kilogram of the polyacrylic acid salt to be granulated.
7. A process as claimed in any preceding claim wherein the powder of polyacrylic acid salt has a particle size distribution of 20-325 mesh.
8. A process as claimed in any one of Claims 1 to 6 wherein the powder of polyacrylic acid salt has a particle size distribution of 48-200 mesh.
9. A process as claimed in any preceding claim wherein the powder of polyacrylic acid salt has an average particle diameter of 100--200 um.
10. A process as claimed in any one of Claims 1 to 8 wherein the powder of polyacrylic acid salt has an average particle diameter of 140-170 um.
11. A process as claimed in any preceding claim wherein the granulation temperature is 40--800C.
12. A process as claimed in any one of Claims 1 to 10 wherein the granulation temperature is 45-7O0C.
1 3. A process as claimed in any preceding claim wherein the polyacrylic acid salt to be sprayed is the same compound as the polyacrylic acid salt to be granulated.
14. A process as claimed in any one of Claims 1 to 12 wherein the polyacrylicacid salt is an alkali metal salt and a part of which may be replaced with an alkaline earth metal salt, ammonium salt or a trivalent metal salt.
1 5. A process as claimed in any one of Claims 1 to 1 2 wherein the polyacrylic acid salt is ammonium salt and a part of the ammonium salt may be replaced with an alkaline earth metal salt or a trivalent metal salt.
16. A process as claimed in Claim 14 wherein the alkali metal salt is sodium salt or potassium salt.
17. A process as claimed in Claim 14 or 15 wherein the alkaline earth metal is calcium, magnesium or barium.
18. A process as claimed in Claim 14 or 1 5 wherein the trivalent metal is iron or aluminum.
19. A process as claimed in any one of Claims 1 to 14 wherein the polyacrylic acid salt is sodium polyacrylate.
20. A process as claimed in Claim 1 9 wherein amount of sodium polyacrylate to be sprayed is 0.3 5--0.5 g per kilogram of sodium polyacrylate to be granulated.
21. A process for producing easily water-soluble sodium polyacrylate granules characterised in that sodium polyacrylate powder of a polymerization degree of 500,000-10,000,000 is granulated according to fluidized bed granulation method at 40-800C while an aqueous solution of sodium polyacrylate of a viscosity of 1 50-350 c.p.s. is sprayed thereon at intervals of longer than 3 seconds, then the granules are sieved to collect a fraction of 1 6-80 mesh and the granules are coated with a water=insoiuble but a water-permeable coating agent.
22. A process for producing easily water-soluble sodium polyacrylate granules according to Claim 21 wherein amount of sodium polyacrylate to be sprayed is 0.35-0.5 g per kilogram of sodium polyacrylate powder to be granulated.
23. A process as claimed in Claim 1 and substantially as described in any one of the specific examples hereinbefore set forth.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54003677A JPS5951568B2 (en) | 1979-01-17 | 1979-01-17 | Method for producing easily water-soluble polyacrylic acid metal salt granules |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2040954A true GB2040954A (en) | 1980-09-03 |
| GB2040954B GB2040954B (en) | 1983-05-11 |
Family
ID=11564040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8001192A Expired GB2040954B (en) | 1979-01-17 | 1980-01-14 | Process for producing polyacrylic acid salt granules easily soluble in water |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5951568B2 (en) |
| CA (1) | CA1154199A (en) |
| DE (1) | DE3001208A1 (en) |
| DK (1) | DK19680A (en) |
| FR (1) | FR2446846B1 (en) |
| GB (1) | GB2040954B (en) |
| IT (1) | IT1127334B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0318989A1 (en) * | 1987-12-04 | 1989-06-07 | Chemische Fabrik Stockhausen GmbH | Polymers with a high rate of absorption for aqueous liquids |
| WO1989005326A1 (en) * | 1987-12-04 | 1989-06-15 | Chemische Fabrik Stockhausen Gmbh | Process for agglomerating water-dilutable polymers by sinter granulation |
| EP0463388A1 (en) * | 1990-05-31 | 1992-01-02 | Hoechst Celanese Corporation | Process for the conversion of fine superabsorbent polymers particles into larger particles |
| EP0697379A3 (en) * | 1994-08-17 | 1996-07-03 | Glatt Ingtech Gmbh | Process for the preparation of agglomerated additives for building materials |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3726789A1 (en) * | 1987-08-12 | 1989-02-23 | Fritz Dr Med Kraemer | Novel device for the treatment of legs with varicose veins or oedematisation |
| DE19752128A1 (en) * | 1997-11-25 | 1999-07-29 | Stockhausen Chem Fab Gmbh | Process for the preparation of water-soluble or water-swellable polymers with a very low residual monomer content, products produced thereafter and their use |
| CN112029563B (en) * | 2020-09-09 | 2022-08-02 | 中铁一局集团有限公司 | High-molecular water-soluble polymer muck dispersant |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1333915A (en) * | 1969-11-27 | 1973-10-17 | Bp Chem Int Ltd | Polyacrylate powders |
| FR2277838A1 (en) * | 1974-07-11 | 1976-02-06 | Solvay | POLY-A-HYDROXYACRYLIC ACID SALTS GRANULES AND THEIR MANUFACTURING PROCESS |
-
1979
- 1979-01-17 JP JP54003677A patent/JPS5951568B2/en not_active Expired
-
1980
- 1980-01-14 GB GB8001192A patent/GB2040954B/en not_active Expired
- 1980-01-15 DE DE19803001208 patent/DE3001208A1/en not_active Withdrawn
- 1980-01-15 IT IT47597/80A patent/IT1127334B/en active
- 1980-01-16 DK DK19680A patent/DK19680A/en not_active Application Discontinuation
- 1980-01-16 FR FR8000937A patent/FR2446846B1/en not_active Expired
- 1980-01-16 CA CA000343770A patent/CA1154199A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0318989A1 (en) * | 1987-12-04 | 1989-06-07 | Chemische Fabrik Stockhausen GmbH | Polymers with a high rate of absorption for aqueous liquids |
| WO1989005326A1 (en) * | 1987-12-04 | 1989-06-15 | Chemische Fabrik Stockhausen Gmbh | Process for agglomerating water-dilutable polymers by sinter granulation |
| WO1989005327A1 (en) * | 1987-12-04 | 1989-06-15 | Chemische Fabrik Stockhausen Gmbh | Polymers with high rate of absorption of aqueous fluids |
| EP0321755A1 (en) * | 1987-12-04 | 1989-06-28 | Chemische Fabrik Stockhausen GmbH | Process for the agglomeration of water-swellable polymers by sinter granulation |
| US5248709A (en) * | 1987-12-04 | 1993-09-28 | Chemische Fabrik Stockhausen Gmbh | Process for the agglomeration of water-swellable polymers by means of sinter granulation |
| EP0463388A1 (en) * | 1990-05-31 | 1992-01-02 | Hoechst Celanese Corporation | Process for the conversion of fine superabsorbent polymers particles into larger particles |
| EP0697379A3 (en) * | 1994-08-17 | 1996-07-03 | Glatt Ingtech Gmbh | Process for the preparation of agglomerated additives for building materials |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2040954B (en) | 1983-05-11 |
| JPS5598230A (en) | 1980-07-26 |
| CA1154199A (en) | 1983-09-20 |
| JPS5951568B2 (en) | 1984-12-14 |
| DE3001208A1 (en) | 1980-07-31 |
| IT8047597A0 (en) | 1980-01-15 |
| IT1127334B (en) | 1986-05-21 |
| FR2446846B1 (en) | 1986-07-04 |
| FR2446846A1 (en) | 1980-08-14 |
| DK19680A (en) | 1980-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |