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    • 1. 发明授权
    • Method for inhibiting polymerization during the recovery and purification of unsaturated mononitriles
    • 在不饱和单腈回收和纯化期间抑制聚合的方法
    • US06984749B2
    • 2006-01-10
    • US10309962
    • 2002-12-04
    • Bruce I. RosenBruce E. Firth
    • Bruce I. RosenBruce E. Firth
    • C07C255/03
    • C07C253/26C07C253/32C07C255/08
    • Economical processes are disclosed for recovery and refining of valuable nitrogen-containing organic compounds formed by catalytic oxidation of least one feed compound selected from the group consisting of propane, propylene, isobutane and isobutylene in the presence of ammonia to produce a gaseous. Processes of the invention include quenching the gaseous reactor effluent with an aqueous quench liquid; forming an aqueous solution comprising the corresponding unsaturated mononitrile, hydrogen cyanide and other organic co-products; and using an integrated sequence of distillations and phase separations to recover for recycle of a useful aqueous liquid, and obtain the desired nitrogen-containing products. According to the invention aqueous solutions are fractionated in an integrated system of multi-stage columns while an effective polymerization inhibiting amount of at least one member of a preselected class of p-phenylenediamine compounds is maintained therein.
    • 公开了经济方法用于在氨的存在下通过催化氧化选自丙烷,丙烯,异丁烷和异丁烯的至少一种进料化合物形成的有价值的含氮有机化合物来回收和精炼以产生气体。 本发明的方法包括用水淬火液淬火气态反应器流出物; 形成包含相应的不饱和单腈,氰化氢和其它有机副产物的水溶液; 并使用一体化的蒸馏和相分离序列来回收有用的含水液体的再循环,并获得所需的含氮产物。 根据本发明,水溶液在多级柱的一体化系统中分级,同时保持有效聚合抑制量的至少一种预选类对苯二胺化合物。
    • 2. 发明授权
    • Method for inhibiting polymerization during the recovery and purification of unsaturated mononitriles
    • 在不饱和单腈回收和纯化期间抑制聚合的方法
    • US07282600B2
    • 2007-10-16
    • US10852277
    • 2004-05-24
    • Bruce I. RosenBruce E. Firth
    • Bruce I. RosenBruce E. Firth
    • C07C255/08
    • C07C253/26C07C253/32C07C255/08
    • Economical processes are disclosed for recovery and refining of valuable nitrogen-containing organic compounds formed by catalytic oxidation of least one feed compound selected from the group consisting of propane, propylene, isobutane and isobutylene in the presence of ammonia to produce a gaseous. Processes of the invention include quenching the gaseous reactor effluent with an aqueous quench liquid; forming an aqueous solution comprising the corresponding unsaturated mononitrile, hydrogen cyanide and other organic co-products; and using an integrated sequence of distillations and phase separations to recover for recycle of a useful aqueous liquid, and obtain the desired nitrogen-containing products. According to the invention aqueous solutions are fractionated in an integrated system of multi-stage columns while an effective polymerization inhibiting amount of at least one member of a preselected class of p-phenylenediamine compounds is maintained therein.
    • 公开了经济方法用于在氨的存在下通过催化氧化选自丙烷,丙烯,异丁烷和异丁烯的至少一种进料化合物形成的有价值的含氮有机化合物来回收和精炼以产生气体。 本发明的方法包括用水淬火液淬火气态反应器流出物; 形成包含相应的不饱和单腈,氰化氢和其它有机副产物的水溶液; 并使用一体化的蒸馏和相分离序列来回收有用的含水液体的再循环,并获得所需的含氮产物。 根据本发明,水溶液在多级柱的一体化系统中分级,同时保持有效聚合抑制量的至少一种预选类对苯二胺化合物。
    • 8. 发明授权
    • Preparation of purified terephthalic acid from waste polyethylene
terephthalate
    • 从废聚对苯二甲酸乙二醇酯制备纯化的对苯二甲酸
    • US5095145A
    • 1992-03-10
    • US609202
    • 1990-11-05
    • Bruce I. Rosen
    • Bruce I. Rosen
    • C07C51/09
    • C07C51/09C08J11/14C08J2367/02Y02W30/704
    • A process is disclosed for producing fiber-grade terephthalic acid from waste polyethylene terephthalate film, fiber, bottles, manufacturing residues, and other manufactured articles. The process comprises depolymerizing waste polyethylene terephthalate in an aqueous mixture to obtain crude terephthalic acid having a b*-value less than 10.00 and an RFCVIS value of about 5000, or greater, which is thereupon hydrogenated in aqueous solution for a period of up to 8 hours. Organic and inorganic impurities are retained in the aqueous components. The purified terephthalic acid has a b*-value less than 2.00, a relative fluorescence concentration in visible light (RFCVIS) of less than 2500, metals content less than 100 ppmw and total organic impurities of less than 1000 ppmw.
    • 公开了一种从废聚对苯二甲酸乙二醇酯膜,纤维,瓶,制造残余物和其它制品制造纤维级对苯二甲酸的方法。 该方法包括将废聚对苯二甲酸乙二醇酯解聚在水性混合物中以获得具有小于10.00的ab *值的粗对苯二甲酸和约5000或更大的RFCVIS值,然后在水溶液中氢化至多8小时 。 有机和无机杂质保留在水性组分中。 纯化的对苯二甲酸具有小于2.00的b *值,可见光(RFCVIS)中的相对荧光浓度小于2500,金属含量小于100ppmw,总有机杂质小于1000ppmw。