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21. 发明专利

GB319228A Improvements in the preparation of calcium sulphate 未知
公开(公告)号：GB319228A
公开(公告)日：1929-09-16
申请号：GB1720928
申请日：1928-06-14
申请人： PETER SPENCE & SONS LTD , SYDNEY FRANCIS WILLIAM CRUNDAL
IPC分类号： C01F11/46
摘要： 319,228. Spence & Sons, Ltd., P., and Crundall, S. F. W. June, 14, 1928. Calcium sulphate.-An extremely finely divided and apparently amorphous form of anhydrous calcium sulphate is obtained by treating hydrated forms thereof with suitable dehydrating agents. The hydrated salt may be mixed with sulphuric acid of specific gravity 1.6-1.84 and the mixture be maintained at 130‹ C. with agitation for say 1-2 hours, or be gradually heated to 140‹ C., or be allowed to stand at ordinary temperature for several days, or be maintained at 100‹ C. for the necessary time. The specific gravity of the sulphuric acid used should not fall below 1.3 during dehydration and the strength, quantity, and concentration thereof should be such that no solution of the sulphate or substantial formation of soluble acid sulphates occurs. The anhydrous sulphate is washed free from acid and dried, or dried and calcined. Dehydration may also be effected by fuming sulphuric acid at ordinary temperature, or by passing dry sulphur trioxide over the hydrated salt, and phosphoric acid or acid sulphates such as titanium sulphate may be used as dehydrating agents. According to the Provisional Specification, the hydrated salt may first be dissolved in concentrated sulphuric acid at say 140‹ C., and the anhydrous salt be then precipitated by dilution; or a mixture of hydrate and sulphuric acid be heated and then calcined; and phosphoric anhydride or glycerin may be used as dehydrating agents.

22. 发明专利

GB290683A Improvements in the preparation of titanium compounds 未知
公开(公告)号：GB290683A
公开(公告)日：1928-05-17
申请号：GB2899326
申请日：1926-11-17
申请人： PETER SPENCE & SONS LTD , SYDNEY FRANCIS WILLIAM CRUNDAL
IPC分类号： C01B25/37
摘要： 290,683. Spence & Sons, Ltd., P., and Crundall, S. r. W. Nov. 17, 1926. Pigments comprising hydrated basic titanic phosphate are prepared by mixing phosphoric acid or a phosphate with a solution of a titanic salt having a free acid content in excess of the equivalent of 15 per cent SO3; when using sulphuric acid, the acidity may be increased up to 50 per cent free SO3; and when using hydrochloric acid, up to the saturation point of the latter. By this means, the concentration of titanic oxide in the solutions used may be increased to over 10 per cent, the precipitation may be effected at temperatures below 50‹ C., for instance at 15‹ C. and finely divided products are obtained. An example describes the preparation of a composite pigment by conducting the precipitation in a solution containing a paste of barium sulphate. Specification 261,051 is referred to.

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