Compositions: coating or plastic – Coating or plastic compositions – Alkali metal silicate containing
Patent
1997-09-19
2000-02-22
Marcantoni, Paul
Compositions: coating or plastic
Coating or plastic compositions
Alkali metal silicate containing
423332, C04B 1204
Patent
active
06027560&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for producing a crystalline, inorganic ion exchange material, specifically silicate builders, useful for ion exchangers and alkalizers.
BACKGROUND ART
Since silicate ion exchange materials have alkaline buffering properties, they are highly useful for detergent builders. Particularly, since the silicate ion exchange materials in crystalline forms have excellent cationic exchange capacities, they are particularly useful for detergent builders.
Among the methods for producing silicate builders, Japanese Examined Patent Publication No. 5-66888discloses a method using water glass as a starting material. In this method, a crystalline sodium-silicate having a layered structure is produced by a method comprising the steps of spray-drying a water glass solution to form amorphous sodium silicate, and heating the resulting sodium silicate in a firing zone while recirculating a portion of the product. However, this method requires drying off large amounts of the water content from the water glass, which makes it disadvantageous from an energy-saving viewpoint.
Japanese Examined Patent Publication No. 6-72008 discloses a method for directly baking the glassy product to solve the above problems. In this method, crystalline sodium silicate is produced by the steps of pulverizing a water glass product obtainable by cooling a fused mixture of sand and soda, and then heating the pulverized product. However, in this method, since the resulting product comprises a two-component system of Na.sub.2 O--SiO.sub.2, the control of the crystalline system becomes difficult, rendering the method unsatisfactory for ion exchange materials for detergents.
DISCLOSURE OF THE INVENTION
In view of the above problems, an object of the present invention is to provide a method for easily producing high-performance silicate ion exchange material using cullets which are easy to handle as starting materials.
This object is achieved by a specific method for producing an ion exchange material.
Specifically, the gist of the present invention is as follows:
(1) A method for producing a crystalline, inorganic ion exchange material having the following composition:
wherein x, y, and z are numerical values satisfying the relationships of y/x=0.5 to 2.1, preferably 0.5 to 2.0, and z/y=0.001 to 1.0; M stands for Na and K, wherein K/Na is in the range from 0.01 to 1.2; and Me stands for Ca and/or Mg, the method comprising the steps of adding 1 to 85 parts by weight of water to 100 parts by weight of cullets, wherein the cullets have the following composition:
wherein x, y, z, M, and Me are defined as above, and then baking the resulting mixture;
(2) A method for producing a crystalline, inorganic ion exchange material having the following composition:
wherein x and y are numerical values satisfying the relationship of y/x=0.5 to 2.1, preferably 0.5 to 2.0; and M stands for Na and K, wherein K/Na is in the range from 0.01 to 1.2, the method comprising the steps of adding 1 to 75 parts by weight of water to 100 parts by weight of cullets, wherein the cullets have the following composition:
wherein x, y, and M are defined as above, and then baking the resulting mixture;
(3) The method described in item (1) above, wherein the cullets are prepared by fusing a mixture comprising silica sand, an alkali metal compound, and an alkaline earth metal compound at a fusing temperature of from 900 to 1500.degree. C., and the baking temperature after adding water to the cullets is from 500 to 1300.degree. C.;
(4) The method described in item (2) above, wherein the cullets are prepared by fusing a mixture comprising silica sand and an alkali metal compound at a fusing temperature of from 900 to 1500.degree. C., and the baking temperature after adding water to the cullets is from 500 to 1300.degree. C.;
(5) The method described in item (3) or item (4) above, wherein the alkali metal compound is selected from the group consisting of potassium hydroxide, sodium hydroxide, potassium carbonate, sodium carbonate, p
Aosaki Taisuke
Otsuka Kazuhiro
Sakaguchi Mikio
Sakamoto Ichiro
Kao Corporation
Marcantoni Paul
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