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    • 1. 发明授权
    • Process for separation and preconcentration of radium from water
    • 从水中分离和预浓缩镭的方法
    • US5863439A
    • 1999-01-26
    • US870914
    • 1997-06-06
    • Mark DietzE. Philip HorwitzRenato ChiariziaRichard A. Bartsch
    • Mark DietzE. Philip HorwitzRenato ChiariziaRichard A. Bartsch
    • C22B60/00G21F9/12C02F1/42
    • C22B60/00G21F9/12Y10S423/14
    • A process for preconcentrating and separating radium from a contaminated solution containing at least water and radium includes the steps of adding a quantity of a water-soluble macrocyclic polyether to the contaminated solution to form a combined solution. An acid is added to the combined solution to form an acidic combined solution having an �H.sup.+ ! concentration of about 0.5M. The acidic combined solution is contacted with a sulfonic acid-based strong acid cation exchange medium or a organophilic sulfonic acid medium having a plurality of binding sites thereon to bind the radium thereto and to form a radium-depleted solution. The radium-depleted solution is separated from the strong acid cation exchange medium or organophilic sulfonic acid medium. The radium remaining bound to the exchange medium or organophilic reagent is then stripped from the exchange medium or organophilic medium and the activity of the radium is measured.
    • 用于将镭从至少含有水和镭的污染溶液中预浓缩和分离的方法包括以下步骤:向受污染的溶液中加入一定数量的水溶性大环聚醚以形成组合溶液。 向合并的溶液中加入酸以形成[H +]浓度为约0.5M的酸性组合溶液。 将酸性组合溶液与其上具有多个结合位点的磺酸基强酸阳离子交换介质或亲能性磺酸介质接触,以将镭与其结合并形成贫铀溶液。 从强酸阳离子交换介质或亲有机磺酸介质中分离贫铀溶液。 然后从交换介质或亲有机介质中剥离剩余与交换介质或亲有机试剂结合的镭,并测定镭的活性。
    • 6. 发明授权
    • Process for the preparation of cis-syn-cis-4,4'
(5')-[di-t-butyldicyclohexano]-18-crown-6
    • 顺式顺式-4,4'(5') - [二叔丁基二环己基] -18-冠-6的制备方法
    • US5478953A
    • 1995-12-26
    • US333783
    • 1994-11-03
    • Michael J. GulaRichard A. Bartsch
    • Michael J. GulaRichard A. Bartsch
    • C07D323/00
    • C07D323/00
    • A process for preparing 4,4'(5')-[di-t-butyldicyclohexano]-18-crown-6 containing an enhanced amount of an isomer that extracts strontium ions from aqueous solution is disclosed. According to the process, an anhydrous reaction mixture is prepared containing 4,4'(5')-[di-t-butyldibenzo]-18-crown-6 as substrate dissolved in a C.sub.2 -C.sub.6 alcohol-containing solvent that can also contain benzene, toluene or xylene, a C.sub.2 -C.sub.6 carboxylic acid or anhydride and a 5 percent of rhodium on alumina particle catalyst. The resulting reaction medium is hydrogenated at about 200-1000 psi, at a temperature of about 35.degree.-120.degree. C. for a time period sufficient to reduce at least 90 percent of the substrate.
    • 公开了一种制备含有增加量的从水溶液中提取锶离子的异构体的4,4'(5') - [二叔丁基二环己基] -18-冠-6的方法。 根据该方法,制备含有4,4'(5') - [二叔丁基二苯并] -18-冠-6作为底物的无水反应混合物,所述底物溶于含C2-C6醇的溶剂中,所述溶剂也可含有 苯,甲苯或二甲苯,C 2 -C 6羧酸或酸酐和5%的氧化铀颗粒催化剂上的铑。 所得反应介质在约200-1000psi,约35-120℃的温度下氢化一段足以减少至少90%底物的时间。