HAINAN LINGKANG PHARMACEUTICAL CO., LTD.
|HAINAN LINGKANG PHARMACEUTICAL CO., LTD. Patent applications|
|Patent application number||Title||Published|
|20140121370||NOVEL METHOD FOR PREPARING CEFMENOXIME HYDROCHLORIDE COMPOUND - A novel process for purifying Cefmenoxime hydrochloride comprises: 1) adding a solvent wherein Cefmenoxime hydrochloride is insoluble at the temperature less than 30° C. filtering after vigorous stirring, washing the filter cake with a solvent wherein Cefmenoxime hydrochloride is insoluble at a temperature less 20° C., and drying; 2) placing the filter cake into ammonium hydroxide, controlling the pH value less than 9 with a gentle agitation to obtain Cefmenoxime acid solution in ammonium hydroxide, and then filtering out the precipitate; 3) adding hydrochloric acid at a concentration of 0.5-4 mol/L to Cefmenoxime acid solution in ammonium hydroxide slowly and controlling the temperature between 30-60° C. and the final pH between 0.5-3.0, and then cooling down to a minimum of 10° C. and standing still to allow crystallization, filtrating and vacuum drying.||05-01-2014|
|20140121369||METHOD FOR PURIFYING CEFTIZOXIME SODIUM - A novel process for refining Ceftizoxime sodium compound, comprises the steps of: 1) dissolving crude Ceftizoxime sodium in water, and extracting with cyclohexane or ethyl acetate, followed by separating the organic phase containing impurities, producing an aqueous phase containing Ceftizoxime sodium; 2) adding ammonia or ammonium hydroxide into the above aqueous phase while stirring, followed by filtrating the precipitate, producing an aqueous filtrate containing Ceftizoxime sodium; 3) adding an alcoholic solvent in the aqueous solution and recrystallizing under controlled temperature, followed by centrifuging and washing the resultant crystals, producing the refined Ceftizoxime sodium after drying; and 4) optionally returning the mother liquid of the recrystallization process to step 3).||05-01-2014|
|20140005381||NOVEL PROCESS FOR REFINING CEFMETAZOLE SODIUM||01-02-2014|
|20130303754||REFINING PROCESS OF CEFAMANDOLE SODIUM - It discloses a novel process for refining cefamandole nafate, comprising: 1) adsorbing cefamandole nafate with strongly acidic ion exchange resin, followed by eluting the resin and collecting the eluate, to provide a primary purified cefamandole acid after concentration under reduced pressure; 2) neutralizing the primary purified cefamandole acid with an aqueous solution of sodium hydroxide or an aqueous solution of basic salt of sodium, followed by adjusting the pH value and filtrating out the insoluble substances with heating, thereby providing a secondary purified aqueous solution of cefamandole nafate; and 3) adding ethanol in a volume ratio between ethanol and water of 4:6 into the aqueous solution, to allow recrystallization under controlling the temperature, to provide a tertiary purified cefamandole nafate. The refined cefamandole nafate product has a purity of no less than 99.5%, mostly no less than 99.6%, with significantly low content of heavy metals.||11-14-2013|
Patent applications by HAINAN LINGKANG PHARMACEUTICAL CO., LTD.