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    • 113. 发明授权
    • Production process of glycolide
    • 乙交酯的生产过程
    • US08722907B2
    • 2014-05-13
    • US13142012
    • 2009-12-09
    • Shigeru SuzukiKazuyuki YamaneToshihiko OnoKazuhiko Sunagawa
    • Shigeru SuzukiKazuyuki YamaneToshihiko OnoKazuhiko Sunagawa
    • C07D319/00
    • C07D319/12
    • The invention provides a production process of glycolide comprising the respective steps of: Step 1 of heating a mixture containing a glycolic acid oligomer and a high boiling polar organic under normal or reduced pressure to reflux the mixture and at that time, conducting a total reflux operation in a reflux time within a range of 0.1 to 20 hours under conditions that substantially the whole amount of a distillate distilled out of a reflux system containing the mixture is refluxed into the reflux system; Step 2 of heating the mixture after the total reflux operation or a mixture obtained by adding the high boiling polar organic solvent to a glycolic acid oligomer component recovered from the mixture after the total reflux operation to conduct depolymerization; and Step 3 of collecting glycolide from a co-distillate.
    • 本发明提供了一种乙交酯的制备方法,其包括以下各步骤:步骤1,在正常或减压下加热含有乙醇酸低聚物和高沸点极性有机物的混合物以回流混合物,并且此时进行总的回流操作 在从含有该混合物的回流系统蒸馏出的基本上全部量的馏出物回流至回流系统的条件下,在0.1至20小时的范围内的回流时间内, 在全部回流操作之后加热混合物的步骤2或通过在完全回流操作后从混合物中回收的乙醇酸低聚物组分加入高沸点极性有机溶剂而获得的混合物进行解聚; 和从共馏出物收集乙交酯的步骤3。
    • 119. 发明授权
    • Iron arsenate powder
    • 砷酸铁粉
    • US08075868B2
    • 2011-12-13
    • US12672693
    • 2008-08-22
    • Tetsuo FujitaTakashi NakamuraShigeru SuzukiKozo Shinoda
    • Tetsuo FujitaTakashi NakamuraShigeru SuzukiKozo Shinoda
    • C22B30/00
    • C01G28/02C01G49/00C01G49/0018C01G49/14C01P2002/77C01P2004/61C01P2006/12C02F1/5236C02F2101/103C02F2103/10
    • There is provided an iron arsenate powder which is produced from an arsenic containing solution and wherein the concentration of arsenic eluted or released from the powder is very low. The iron arsenate powder is a powder of dihydrate of iron arsenate, which has a crystal structure of rhombic system and which has lattice constants of a=0.8950 to 0.8956 nm, b=1.0321 to 1.0326 nm and c=1.0042 to 1.0050 nm at room temperatures and atmospheric pressure. The iron arsenate powder can be produced by a method comprising the steps of: adding ferrous ions to an arsenic containing solution to cause the molar ratio (Fe/As) of iron to arsenic in the solution to be not lower than 1; adding an oxidizing agent to the solution; heating the solution to a temperature of not lower than 70° C. while stirring the solution, to allow a reaction; and carrying out a solid-liquid separation to wash the obtained solid part.
    • 提供了由含砷溶液制备的砷酸铁粉末,其中从粉末中洗脱或释放的砷的浓度非常低。 砷酸铁粉末是砷酸铁的二水合物的粉末,其具有菱形体系的晶体结构,其晶格常数为a = 0.8950〜0.8956nm,b = 1.0321〜1.0326nm,c = 1.0042〜1.0050nm,室温 和大气压力。 所述砷酸铁粉末可以通过以下方法制造:将亚铁离子添加到含砷溶液中,使得所述溶液中的铁与砷的摩尔比(Fe / As)为1以上; 向溶液中加入氧化剂; 在搅拌溶液的同时将溶液加热至不低于70℃的温度,以进行反应; 并进行固液分离以洗涤所获得的固体部分。