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    Preparation of branched block copolymers
    1.
    发明授权
    Preparation of branched block copolymers 失效

    公开(公告)号：US4418180A

    公开(公告)日：1983-11-29

    申请号：US296849

    申请日：1981-08-27

    申请人： Gerhard Heinz ,  Burghard Schmitt ,  Ingo H. Dorn ,  Hermann Gausepohl ,  Karl Gerberding ,  Rudolf H. Jung ,  Hans Mittnacht ,  Jurgen Pohrt ,  Paul Witimer

    发明人： Gerhard Heinz ,  Burghard Schmitt ,  Ingo H. Dorn ,  Hermann Gausepohl ,  Karl Gerberding ,  Rudolf H. Jung ,  Hans Mittnacht ,  Jurgen Pohrt ,  Paul Witimer

    IPC分类号： C08F297/04

    CPC分类号： C08F297/044

    摘要： A process for the preparation of branched block copolymers of from 60 to 95% by weight of a monovinyl-aromatic monomer and from 40 to 5% by weight of a conjugated diene by polymerizing the monomers in an inert solvent in the presence of a monolithium-hydrocarbon as the initiator, wherein, in a first process stage (a), from 50 to 80, or where necessary at most 90, % by weight of the total amount of monovinyl-aromatic compound are polymerized to virtually complete conversion in the presence of a relatively small amount of the monolithium-hydrocarbon. This stage is carried out by starting with from 30 to 70% by weight of the vinyl-aromatic monomer and adding from 70 to 30% by weight in the feed, during the polymerization, in such a way that the polymerization temperature, which at the start of the polymerization is from 30.degree. to 40.degree. C., is kept at from 45.degree. to 70.degree. C., with use of reflux cooling. After all the monomer feed has been added, the reaction temperature is lowered to 30.degree.-40.degree. C. by evaporative cooling. In a second process stage (b), an additional amount of initiator is added to the reaction solution, after which from 1 to 30% by weight of the total amount of monovinyl-aromatic monomer can be added, the sum of the amounts of monovinyl-aromatic monomer added in the first and second process stages being at most 90% by weight of the total amount of monovinyl-aromatic monomer. The monovinyl-aromatic monomer added in the second process stage is polymerized to virtually complete conversion, employing the temperature profile described for stage (a). In process stage (c), the remainder of the monovinyl-aromatic monomer and all of the conjugated diene are added, at least predominantly in the form of a mixture, and polymerized so that the reaction temperature does not rise above 90.degree.-110.degree. C. Finally, after virtually complete conversion of the monomers, and preferably without prior cooling, a suitable liquid polyfunctional coupling agent is run in undiluted and the mixture of the linear block copolymers obtained, which still contain active terminal lithium-carbon bonds, is coupled, with stirring, to form branched block copolymers. The products prepared according to the invention are used for injection molding.

    Decomposition of organohalogen compounds in dust-laden-waste gases
    3.
    发明授权
    Decomposition of organohalogen compounds in dust-laden-waste gases 失效
    有机卤素化合物在含尘废气中的分解

    公开(公告)号：US5645806A

    公开(公告)日：1997-07-08

    申请号：US274694

    申请日：1994-07-14

    申请人： Klaus Hess ,  Roland Spahl ,  Hans Christoph Horn ,  Ingo H. Dorn ,  Gunter Dinkhauser ,  Hans-Ingo Joschek

    发明人： Klaus Hess ,  Roland Spahl ,  Hans Christoph Horn ,  Ingo H. Dorn ,  Gunter Dinkhauser ,  Hans-Ingo Joschek

    IPC分类号： B01D53/86 ,  C01B7/00

    CPC分类号： B01D53/8662

    摘要： A process for decomposing organohalogen compounds which are present in dust-laden gases which have a carbon content of less than 0.6% by weight, by oxidative breakdown with the aid of solid catalysts suitable for this purpose, whereina) the dust is deposited from the gases at 250.degree.-500.degree. C., and the dust-free gas is passed together with oxygen or an oxygen-containing gas over the catalyst, orb) the deposition of the dust takes place at below 250.degree. C., the organohalogen compounds are desorbed from the dust in an oxygen-containing gas stream at 250.degree.-500.degree. C., and the gas stream is passed over the catalyst, orc) the dust-laden gas is passed in the presence of oxygen over the catalyst at 250.degree.-500.degree. C., and the dust is subsequently removed.

    摘要翻译： 通过借助于适合于此目的的固体催化剂的氧化分解，分解存在于含碳量低于0.6重量％的含尘气体中的有机卤素化合物的方法，其中a）从 气体在250°-500℃，无尘气体与氧气或含氧气体一起通过催化剂，或b）灰尘的沉积发生在250℃以下，有机卤素 化合物在250-500℃的含氧气流中从灰尘中解吸，气流通过催化剂，或c）含尘气体在氧气存在下通过催化剂 在250°-500℃下，随后除去灰尘。