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    • 5. 发明授权
    • Process for the preparation of easy-flowing (flowable) oxytetracyclin
hydrochloride
    • 制备易流动(可流动)盐酸土霉素的方法
    • US4579686A
    • 1986-04-01
    • US606348
    • 1984-05-02
    • Miklos SzarvasEva Horvath nee FeherLaszlo CsekeJanos BalintFerenc FabianLajos Kun
    • Miklos SzarvasEva Horvath nee FeherLaszlo CsekeJanos BalintFerenc FabianLajos Kun
    • C07C237/26C07C67/00C07C231/00C07C233/00C07C103/26
    • C07C233/00
    • The invention relates to a new process for the preparation of easy-flowing (flowable) oxytetracyclin hydrochloride. According to the process of the invention, the crude, dry or filter-wet oxytetracyclin hydrochloride consisting of needle-shaped crystals is boiled with an organic solvent forming an azeotropic mixture with water, optionally a part of the solvent is distilled off in a form of an azeotropic mixture, then the mixture is cooled and the precipitated oxytetracyclin hydrochloride consisting of spherical crystals is separated and dried.Oxytetracyclin hydrochloride exists in two various crystal forms, the one of which is needle-shaped, while the other one consists of orthorhombic sheets. The crystals of this latter form are capable of forming spherical particles by coalescence. The crystal form consisting of spherical particles is much more useful for the pharmaceutical industry.By means of the new process easy-flowing (flowable) oxytetracyclin hydrochloride can be prepared in a favorable yield and with a high purity from the crude hydrochloride product consisting of needle-shaped crystals.
    • 本发明涉及一种制备易流动(可流动的)盐酸四环素的新方法。 根据本发明的方法,将由针状结晶组成的粗制,干燥或过滤湿润的土霉素盐酸盐与有机溶剂一起沸腾,与水形成共沸混合物,任选地,一部分溶剂以 共沸混合物,然后将混合物冷却,分离并干燥沉淀的由球形晶体组成的盐酸四环素盐酸盐。 盐酸四环素以两种不同的晶体形式存在,其中一种是针状,另一种由斜方片组成。 后一种形式的晶体能够通过聚结形成球形颗粒。 由球形颗粒组成的晶体形式对于制药工业来说更为有用。 通过新方法,易于流动(可流动)的盐酸土霉素可以从由针状晶体组成的粗盐酸盐产物以有利的产率和高纯度制备。