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    PROCESS FOR THE PURIFICATION OF BENZALDEHYDE
    11.
    发明专利
    PROCESS FOR THE PURIFICATION OF BENZALDEHYDE 未知

    公开(公告)号：CA1107299A

    公开(公告)日：1981-08-18

    申请号：CA313553

    申请日：1978-10-17

    Applicant: STAMICARBON

    Inventor： ELMENDORP JAN

    IPC: C07C47/54 ,  C07C45/00 ,  C07C45/36 ,  C07C45/78 ,  C07C45/82 ,  C07C67/00

    Abstract: The invention relates to a process for the purification of benzaldehyde and, in particular, the purification of benzaldehyde prepared by oxidation of toluene with a gas containing molecular oxygen. According to the invention, pure benzaldehyde is prepared by treating impure benzaldehyde with an oxidizing agent and distilling it. Benzaldehyde purified according to the invention is particularly suitable for application in the synthesis of scents and flavours, because it can meet the demands of olfactory specifications.

    13.
    发明专利
    未知

    公开(公告)号：DE1246694B

    公开(公告)日：1967-08-10

    申请号：DEST023652

    申请日：1965-04-08

    Applicant: STAMICARBON

    Inventor： ROOIJ ABRAHAM HERMANUS DE ,  ELMENDORP JAN

    IPC: C01B17/90

    Abstract: Ammonium bisulphate is extracted with methanol to form a double salt (NH4)3H1804)2 and an extract containing free sulphuric acid, the double salt is separated off and further extracted with methanol to form ammonium sulphate which is separated off and a further extract containing free sulphuric acid, the two extracts being separated into sulphuric acid and methanol by distillation. The ammonium bisulphate may be solid, in suspension or solution and may be obtained in the preparation of cyclohexanone oxime from hydroxylamine disulphonic acid and subsequent preparation of e caprolactam, the resulting sulphuric acid, after concentration with sulphur dioxide being fed back into the lactam preparation. The sulphuric acid produced may contain about 17% by weight of ammonium sulphate.

    15.
    发明专利
    未知

    公开(公告)号：DE2129657A1

    公开(公告)日：1971-12-23

    申请号：DE2129657

    申请日：1971-06-15

    Applicant: STAMICARBON

    Inventor： ELMENDORP JAN ,  DE ROOIJ ABRAHAM HERMANUS

    IPC: C07D201/16 ,  C07D41/06

    Abstract: 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.

    16.
    发明专利
    未知

    公开(公告)号：DE1567830A1

    公开(公告)日：1970-08-20

    申请号：DE1567830

    申请日：1965-03-18

    Applicant: STAMICARBON

    Inventor： HERMANUS ROOIJ ABRAHAM ,  ELMENDORP JAN

    IPC: C01B25/28 ,  C01B25/40 ,  C01B25/46 ,  C05B1/04 ,  C05B7/00 ,  C05B11/06 ,  C01B25/02

    Abstract: Water-soluble calcium phosphate is prepared by decomposing phosphate rock with excess HNO3 of e.g. 45-65% concn., extracting this decomposition liquor with a polar organic solvent which is poorly immiscible with H2O to remove most of the acids and part of the Ca(NO3)2, extracting this extractor soln. with a polar organic solvent poorly immiscible with H2O which preferentially dissolves HNO3, such that Ca(NO3)2 and H3PO4 remaining in the solution are converted to Ca(H2PO4)2 MH2PO4, where M is alkalimetal or NH4, may be prepared by adding M2SO4 to the aqueous extractor solution as above, separating the pptd. gypsum, and extracting the HNO3 as above. The decomposition liquor may be extracted by an ether or ketone but preferably by an aliphatic alcohol having 4-6 carbon atoms in the molecule. The HNO3 may be extracted by an aliphatic ketone or ether. Some Ca(NO3)2 may be removed from the decomposition liquor by partial crystallization before extraction. The process may be carried out in a continuous manner by recycling the organic solvent from the first extraction stage after washing with H2O; crystallizing the phosphate from the aqueous extractor soln. after removal of HNO3 therefrom, and recycling the phosphate mother liquor to the HNO3-extraction stage, and neutralizing the HNO3-containing solvent, e.g. with aq. NH3, and recycling this solvent after removal of the nitrate produced. A flow-diagram for such a continuous process is described.

    17.
    发明专利
    未知

    公开(公告)号：DE1956908A1

    公开(公告)日：1970-06-18

    申请号：DE1956908

    申请日：1969-11-12

    Applicant: STAMICARBON

    Inventor： HERMANUS DE ROOIJ ABRAHAM ,  ELMENDORP JAN

    IPC: C01B21/02 ,  C01B21/14 ,  C01B21/26

    Abstract: 1287302 Oximes STAMICARBON NV 11 Nov 1969 [12 Nov 1968] 55238/69 Heading C2C In a continuous process for the production of an oxime in which an aqueous reaction medium is recycled between a hydroxylamine saltforming zone in which nitrate ions are catalytically reduced with molecular hydrogen and an oxime formation zone in which hydroxylamine salt is reacted with a ketone or an aldehyde, the nitrate ions in the said aqueous reaction medium are replenished by absorption of nitrous gases, i.e. a mixture of NO 2 and NO therein to form nitric acid. The preparation is described of cyclohexanone oxime, referring to Figs. 1-3 (not shown).

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