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浏览/检索结果: 共4条，第1-4条 帮助 限定条件 发表日期：2013    内容类型：专利     已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Phase-transfer catalytic preparation of 9-fluorenone involves mixing fluorine with xylene with alkali solution as catalyst, adding quat.-ammonium salt, stirring, introducing oxygen-containing gas, cooling, crystallizing, and filtering. 专利 申请日期: 2013-01-01, 公开日期: 2013-12-11 作者:  YAN J YU L LI H GAO Z HE Y 收藏  |  浏览/下载：2/0  |  提交时间：2019/12/13 Preparing 9-fluorenone from industrial fluorine using e.g. alkali catalyst comprises e.g. dissolving industrial fluorene and quaternary ammonium salt in toluene to prepare oil phase, preparing aqueous phase alkali solution, mixing, layering. 专利 申请日期: 2013-01-01, 公开日期: 2013-12-25 作者:  LI H JUNG D YU L GAO Z HE Y 收藏  |  浏览/下载：3/0  |  提交时间：2019/12/13 Method for recognizing error code tolerance for low density parity check (LPDC) code length and code rate, involves determining testing code length and rate corresponding to minimum normalized value to be recognized at end of test. 专利 申请日期: 2013-01-01, 公开日期: 2013-02-06 作者:  YU M GAO X DU Y 收藏  |  浏览/下载：4/0  |  提交时间：2019/12/13 Preparation of 9-fluorenone involves combining fluorene and quaternary ammonium salt, dissolving in nitrogen-containing heterocyclic compound to obtain oil phase, and dissolving alkali catalyst in water to obtain aqueous phase. 专利 申请日期: 2013-01-01, 公开日期: 2013-12-11 作者:  YU L LI H GAO T GAO Z HE Y 收藏  |  浏览/下载：1/0  |  提交时间：2019/12/13