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    3-Haloalkoxy-4-nitro-2'-chloro-4'-trifluoromethyldiphenyl ethers and herbicidal use thereof
    71.
    发明授权
    3-Haloalkoxy-4-nitro-2'-chloro-4'-trifluoromethyldiphenyl ethers and herbicidal use thereof 失效
    3-卤代烷氧基-4-硝基-2'-氯-4'-三氟甲基二苯醚及其除草用途

    公开(公告)号：US4417919A

    公开(公告)日：1983-11-29

    申请号：US347400

    申请日：1982-02-10

    Applicant: Otto Rohr

    Inventor： Otto Rohr

    IPC: A01N33/22 ,  A01N37/00 ,  C07C67/00 ,  C07C201/00 ,  C07C201/12 ,  C07C205/38 ,  A01N31/00 ,  C07C43/263

    CPC classification number: C07C205/38 ,  A01N37/00

    Abstract: The invention relates to novel 3-haloalkoxy-4-nitro-2'-chloro-4'-trifluoromethyl-diphenyl ethers with herbicidal properties. These compounds have good selectivity in different crops of useful plants, e.g. cereals, rice, cotton and, in particular, soybeans and maize. The novel compounds have the formula I ##STR1## wherein R is difluoromethyl or 2-chloro-1,1,2-trifluoroethyl.

    Abstract translation: 本发明涉及具有除草性质的新型3-卤代烷氧基-4-硝基-2'-氯-4'-三氟甲基 - 二苯基醚。 这些化合物在不同作物的有用植物中具有良好的选择性，例如。 谷物，水稻，棉花，特别是大豆和玉米。 新化合物具有式I（I）其中R是二氟甲基或2-氯-1,1,2-三氟乙基。

    High purity 2,4-dinitrotoluene from toluene nitration process
    75.
    发明授权
    High purity 2,4-dinitrotoluene from toluene nitration process 失效
    甲苯硝化过程中的高纯度2,4-二硝基甲苯

    公开(公告)号：US4367347A

    公开(公告)日：1983-01-04

    申请号：US269137

    申请日：1981-06-01

    Applicant: John E. Sawicki

    Inventor： John E. Sawicki

    IPC: C07C67/00 ,  C07C201/00 ,  C07C201/16 ,  C07C205/06 ,  C07C79/10

    CPC classification number: C07C201/16

    Abstract: A method for preparing substantially pure 2,4-DNT isomer from its admixture with other DNT isomers which comprises contacting the isomer mixture with aqueous sulfuric acid at an elevated temperature, separating excess DNT isomer mixture from the sulfuric acid phase and cooling the sulfuric acid phase. Also, in a method for producing dinitrotoluenes which comprises:(a) nitrating toluene in a first nitration stage with an aqueous mixture of sulfuric and nitric acids to form an organic phase containing mononitrotoluenes and a first aqueous spent acid phase;(b) separating the organic phase from the first aqueous spent acid phase;(c) nitrating the mononitrotoluenes contained in the organic phase in a second nitration stage using a mixture of sulfuric and nitric acids to form an organic phase containing dinitrotoluenes and a second aqueous spent acid phase; and(d) separating the organic phase from the second aqueous spent acid phase for recovery of the dinitrotoluene product from the organic phase;the novel feature comprising:(e) cooling at least a portion of the first or second aqueous spent acid phase to a temperature sufficient to effect crystallization of substantially pure 2,4-DNT;(f) recovering the 2,4-DNT crystals from the cooled aqueous spent acid phase; and(g) returning the portion of the cooled spent acid phase to a nitration stage.

    Abstract translation: 从其与其它DNT异构体的混合物制备基本上纯的2,4-DNT异构体的方法，其包括在高温下使异构体混合物与硫酸水溶液接触，从硫酸相分离过量的DNT异构体混合物并冷却硫酸相 。 此外，在制备二硝基甲苯的方法中，其包括：（a）在第一硝化阶段用硫酸和硝酸的含水混合物硝化甲苯以形成含有单硝基甲苯和第一含水废酸相的有机相; （b）将有机相与第一含水废酸相分离; （c）在第二硝化阶段使用硫酸和硝酸的混合物硝化有机相中所含的单硝基甲苯以形成含有二硝基甲苯和第二废酸水相的有机相; 和（d）将有机相与第二废酸水相分离，以从有机相中回收二硝基甲苯产物; 该新颖特征包括：（e）将至少一部分第一或第二含水废酸相冷却到足以实现基本上纯的2,4-DNT的结晶的温度; （f）从冷却的废酸水相中回收2,4-DNT晶体; 和（g）将冷却的废酸相的一部分返回到硝化阶段。

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