发明名称 |
Abscheidung von Lactamen aus einem,konzentrierte Schwefelsaeure bzw.Schwefeltrioxyd enthaltenden Medium |
摘要 |
1313959 Phosphoric acid; ammonium phosphate STAMICARBON NV 15 June 1971 [17 June 1970] 28034/71 Heading C1A [Also in Division C2] The decomposition of rock phosphate is carried out using the solution remaining after removal of the lactam from a mixture thereof with sulphuric acid and/or free SO 3 by adding an aqueous solution of ammonium or alkali metal dihydrogen phosphate in a molar ratio of phosphate to sulphuric acid and/or free SO 3 of at least 0À25 : 1 and extracting the lactam by means of an extraction agent. The free phosphoric acid-containing solution remaining after the decomposition of the rock phosphate is treated to remove gypsum therefrom and at least a portion of the solution is neutralized to form ammonium dihydrogen phosphate which may be recycled to the lactam removal zone. |
申请公布号 |
DE2129657(A1) |
申请公布日期 |
1971.12.23 |
申请号 |
DE19712129657 |
申请日期 |
1971.06.15 |
申请人 |
STAMICARBON N.V. |
发明人 |
ELMENDORP,JAN;DE. ROOIJ,ABRAHAM HERMANUS |
分类号 |
C07D201/16 |
主分类号 |
C07D201/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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