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1.发明授权公开(公告)号：US06225477B1
公开(公告)日：2001-05-01
申请号：US09018823
申请日：1998-02-04
IPC分类号： C07D30756
摘要： This invention relates to a method of improving the catalytic performance of palladium or ruthenium, rhenium-on-carbon hydrogenation catalysts operating in aqueous media where loss of soluble rhenium may result in rapid catalytic failure. A rhenium-containing hydrogenation catalyst comprised of rhenium on a support material is regenerated by first treating the catalyst with aqueous perrhenic acid or potassium perrhenate followed by treating the catalyst under reducing conditions at elevated temperature and pressure. Treatment of the catalyst as described replenishes dispersed fresh finely divided rhenium which enhances the activity of the catalyst while at the same time allowing the operations to be carried out in situ in the hydrogenation reactor or in a side stream reactor with significant savings in reducing reactor down time and precious metal expenses.
摘要翻译： 本发明涉及一种提高钯或钌，碳酸氢铼催化剂在水介质中的催化性能的方法，其中可溶性铼的损失可导致快速催化失效。 通过首先用高铼酸水溶液或高铼酸钾处理催化剂，然后在还原条件下在升高的温度和压力下处理催化剂，再生由载体材料上的铼组成的含铼氢化催化剂。 如上所述处理催化剂补充分散的新鲜细分的铼，其增强了催化剂的活性，同时允许操作在氢化反应器或侧流反应器中原位进行，显着节省了减少反应器的下降 时间和贵金属费用。
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公开(公告)号：US06566539B1
公开(公告)日：2003-05-20
申请号：US10198424
申请日：2002-07-18
IPC分类号： C07D30708
CPC分类号： C07D307/20 , C07D307/08 , Y02P20/584
摘要： A process for the production of tetrahydrofuran, gamma butyrolactone, 1,4-butane diol and the like from a hydrogenatable precursor such as maleic acid, succinic acid, corresponding esters and their mixtures and the like in the presence of hydrogen and a noble metal catalyst, wherein oxidizing agents such as hydrogen peroxide, oxygen or air are used to regenerate spent noble metal catalyst for further use in the process.
摘要翻译： 可氢化前体如马来酸，琥珀酸，相应的酯及其混合物等在氢气和贵金属催化剂存在下生产四氢呋喃，γ-丁内酯，1,4-丁二醇等的方法 其中使用氧化剂如过氧化氢，氧气或空气来再生用过的贵金属催化剂，用于该方法的进一步使用。
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公开(公告)号：US06428764B1
公开(公告)日：2002-08-06
申请号：US09565352
申请日：2000-05-05
IPC分类号： C01B2522
CPC分类号： C01B7/192 , C01B33/126 , C01F11/22 , C01P2004/62
摘要： A process is disclosed for producing calcium fluoride. The process comprises (a) mixing phosphate rock with aqueous H2SiF6 at ambient temperature for at least one hour; (b) nucleating the calcium fluoride in the slurry prepared in step (a) by reacting the slurry at a temperature and for a time sufficient to initiate and sustain nucleation of calcium fluoride and SiO2 by-product; (c) aggregating the SiO2 by-product by heating the slurry produced in step (b) at a temperature of about 90° C. to about 105° C. for at least 0.5 hours; and (d) recovering a calcium fluoride-containing product of an average particle size of less than 1 micron.
摘要翻译： 公开了一种用于生产氟化钙的方法。 该方法包括（a）在环境温度下将磷酸盐岩与H 2 SiF 6水溶液混合至少1小时; （b）通过在足以引发和维持氟化钙和SiO 2副产物的成核的温度和时间下使浆料反应，使步骤（a）中制备的浆料中的氟化钙成核; （c）通过将步骤（b）中产生的浆料在约90℃至约105℃的温度下加热至少0.5小时来聚集SiO 2副产物; 和（d）回收平均粒径小于1微米的含氟化钙的产物。
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公开(公告)号：US06224844B1
公开(公告)日：2001-05-01
申请号：US09393914
申请日：1999-09-10
IPC分类号： C01F1122
摘要： A process is disclosed for producing calcium fluoride comprising: (a) mixing aqueous H3PO4 with aqueous H2SiF6 to form a mixture such that the concentration of H3PO4 is at least about 3 moles/liter, (b) adding phosphate rock to the mixture at a rate such that the pH of the mixture is maintained at less than about 1.0 and at a temperature sufficient to form a second mixture containing calcium fluoride, and (c) separating calcium fluoride from the second mixture.
摘要翻译： 公开了一种用于生产氟化钙的方法，其包括：（a）将H 3 PO 4水溶液与H 2 SiF 6水溶液混合以形成混合物，使得H 3 PO 4的浓度为至少约3摩尔/升，（b）以一定的速率向混合物中加入磷酸盐岩 使得混合物的pH保持在小于约1.0且足以形成含有氟化钙的第二混合物的温度，和（c）从第二混合物中分离氟化钙。
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