Crystal habit modification of inorganic salts using polymeric sulfonates or sulfates |
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| 申请号 | US3770390D | 申请日 | 1971-02-26 | 公开(公告)号 | US3770390A | 公开(公告)日 | 1973-11-06 |
| 申请人 | DOW CHEMICAL CO; | 发明人 | TEOT A; | ||||
| 摘要 | Disclosed herein is an improved method for crystallizing watersoluble inorganic salts. The improvement comprises adding to the crystallizing system a small amount of a monovalent salt of a polymeric sulphonate or sulfate characterized by the formula: WHEREIN R is hydrogen or methyl, m is an integer from 3 to 3,000, n is 0 or 1, and Y is a connecting group which is oxo, phenyl, phenoxy, carboxy alkyl or similar organic radical. The X portion of the sulphonate or sulfate group is a monovalent cation such as hydrogen, lithium, sodium, potassium and ammonium. The resulting crystals are larger and more regularly shaped than crystals produced by prior art methods. |
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| 权利要求 | 2. The process as in claim 1 wherein the water soluble inorganic salt is selected from the group consisting of potassium nitrate, potassium sulfate, potassium chloride, and ammonium sulfate. 3. A process as in claim 1 wherein from about 0.0005 to about 0.5 weight percent of polymeric sulphonate or sulfate is present in the aqueous system based on the weight of inorganic salt present therein. 4. A process as in claim 2 wherein the polymeric sulphonate is sodium polystyrene sulfonate or sodium polysulfoethylmethacrylate. |
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