Method of preparing dinitramidic acid and salts thereof
    1.
    发明授权
    Method of preparing dinitramidic acid and salts thereof 失效
    制备二硝酸的方法及其盐

    公开(公告)号:US5976483A

    公开(公告)日:1999-11-02

    申请号:US983462

    申请日:1998-01-13

    摘要: The invention relates to a method of preparing dinitramidic acid HN(NO.sub.2).sub.2 and salts thereof having the formula M.sup.+n (.sup.- N(NO.sub.2).sub.2).sub.n, wherein M is a metal cation or a nitrogen-containing cation and n=1-3. The dinitramide salt can be used as oxidiser in solid propellants. Dinitramidic acid is prepared by nitration of a compound selected from a group consisting of NH.sub.2 NO.sub.2, NH.sub.4 NH.sub.2 CO.sub.2 ; NH.sub.2 SO.sub.3 H, NH(SO.sub.3 H).sub.2, N(SO.sub.3 H).sub.3, and its salts with metal cations or organic cations, e.g. NH(SO.sub.3 NH.sub.4).sub.2, and other products formed when ammonia is reacted with sulphuric trioxide, with a common nitrating acid such as nitric acid/sulphuric acid or nitric acid/acetic anhydride. The invention also relates to a method of preparing dinitramide salt, comprising neutralisation of dinitramidic acid with a neutralising agent, e.g. ammonia, and recovery of the dinitramide salt from a mixture of salts formed in the neutralisation. An aqueous solution of the salt mixture is passed through a column containing an adsorbing agent which adsorbs the dinitramide salt and is selected from a class consisting of activated carbon, silica gel and zeolites. The dinitramide salt is eluted with an elution agent consisting of hot water and/or a polar organic solvent, e.g. acetone, acetonitrile, 2-propanol and other lower alcohols and mixtures thereof.

    摘要翻译: PCT No.PCT / SE96 / 00976 Sec。 371日期1998年1月13日 102(e)1998年1月13日PCT PCT 1996年7月26日PCT公布。 出版物WO97 / 06099 日期1997年2月20日本发明涉及制备具有式M + n(-N(NO 2)2)n的二硝基酸HN(NO 2)2及其盐的方法,其中M为金属阳离子或含氮 阳离子,n = 1-3。 二硝酸盐可用作固体推进剂中的氧化剂。 二硝基甲酸通过硝化选自由NH 2 NO 2,NH 4 NH 2 CO 2, NH 2 SO 3 H,NH(SO 3 H)2,N(SO 3 H)3及其与金属阳离子或有机阳离子的盐。 NH(SO3NH4)2,和氨与三氧化硫反应形成的其他产物与硝酸/硫酸或硝酸/乙酸酐等常见硝酸反应生成。 本发明还涉及一种制备二硝酸盐的方法,其包括用中和剂中和二硝基甲酸,例如, 氨和从中和形成的盐的混合物中回收二硝酸盐。 将盐混合物的水溶液通过含有吸附二硝酸盐的吸附剂的柱,并且选自活性炭,硅胶和沸石。 用由热水和/或极性有机溶剂组成的洗脱剂洗脱二硝
    化盐,例如, 丙酮,乙腈,2-丙醇等低级醇及其混合物。