ONE-STEP PREPARATION OF 4, 6-DINITRORESORCINOL FROM RESORCINOL
    473.
    发明申请
    ONE-STEP PREPARATION OF 4, 6-DINITRORESORCINOL FROM RESORCINOL 审中-公开
    从维生素C的一步法制备4,6-六氯氰菊酯

    公开(公告)号:WO1995025085A1

    公开(公告)日:1995-09-21

    申请号:PCT/US1994008799

    申请日:1994-08-03

    CPC classification number: C07C201/08 C07C205/23

    Abstract: 4, 6-Dinitroresorcinol is prepared by reacting resorcinol with concentrated nitric acid that is substantially free of suboxides of nitric acid. It has been found that greater than 60 percent yields of the desired product can be obtained when the concentration of aqueous nitric acid used is between 80 and 93 weight percent, and the concentration of suboxides is less than 2 weight percent based on the weight of nitric acid.

    Abstract translation: 4,6-二硝基间苯二酚是通过使间苯二酚与基本上不含硝酸的低浓度硝酸的浓硝酸反应来制备的。 已经发现,当使用的硝酸水溶液的浓度为80-93重量%时,可以获得所需产物的60%以上的产率,并且基于硝酸的重量,低氧化物的浓度小于2重量% 酸。

    NITRATION SYSTEM, AND PROCESS FOR NITRATING AROMATIC COMPOUNDS
    474.
    发明申请
    NITRATION SYSTEM, AND PROCESS FOR NITRATING AROMATIC COMPOUNDS 审中-公开
    硝化系统和硝基化合物的方法

    公开(公告)号:WO1993023352A1

    公开(公告)日:1993-11-25

    申请号:PCT/NO1993000065

    申请日:1993-04-23

    Inventor: NORSK HYDRO A.S

    Abstract: The invention relates to a new nitration system, comprising dinitrogen pentoxide dissolved in liquid sulphur dioxide. The invention also relates to a process for nitrating aromatic compounds, where the nitration agent used is dinitrogen pentoxide dissolved in sulphur dioxide. This process is particularly favourable for nitration of aromatics that are unstable under acidic conditions. Further, this process has given very good results when nitrating aromatics that hardly have been possible to nitrate by using known nitration systems reported in the literature.

    Abstract translation: 本发明涉及一种新的硝化体系,其包括溶解在液态二氧化硫中的五氧化二氮。 本发明还涉及一种硝化芳族化合物的方法,其中所用的硝化剂是溶解在二氧化硫中的五氧化二氮。 该方法特别有利于在酸性条件下不稳定的芳族化合物的硝化。 此外,当通过使用文献中报道的已知硝化体系硝酸化几乎不可能硝酸盐时,该方法获得了非常好的结果。

    A PROCESS FOR PREPARING DINITROTOLUENE
    475.
    发明申请
    A PROCESS FOR PREPARING DINITROTOLUENE 审中-公开
    一种制备食品加工剂的方法

    公开(公告)号:WO1992006937A1

    公开(公告)日:1992-04-30

    申请号:PCT/US1991007032

    申请日:1991-09-26

    CPC classification number: C07C201/08 C07C205/06

    Abstract: Described herein is a continuous process for the production of dinitrotoluene characterized by the following steps: (a) reacting toluene with dilute nitric acid to produce a product mixture containing mononitrotoluene, water and unreacted nitric acid; (b) then separating the mononitrotoluene from the mixture; (c) then reacting the mononitrotoluene recovered from step (b) with concentrated nitric acid to produce a product mixture containing dinitrotoluene, water and unreacted nitric acid; (d) then separating a portion of the nitric acid from the mixture for recycle to step (c); (e) then adding water to the mixture of water, unreacted nitric acid and dinitrotoluene; (f) then separating the dinitrotoluene from the mixture by crystallization; (g) then recycling the remaining dilute nitric acid from step (f) to step (a).

    HIGH PURITY PROCESS FOR THE PREPARATION OF 4,6-DIAMINO-1,3-BENZENEDIOL
    476.
    发明申请
    HIGH PURITY PROCESS FOR THE PREPARATION OF 4,6-DIAMINO-1,3-BENZENEDIOL 审中-公开
    用于制备4,6-二氨基-1,3-苯二酮的高纯度工艺

    公开(公告)号:WO1988003131A1

    公开(公告)日:1988-05-05

    申请号:PCT/US1987002800

    申请日:1987-10-28

    Abstract: High purity 4,6-dinitro-1,3-benzenediol is prepared by (a) contacting a 1,2,3-trihalobenzene with a nitrating agent and an acid under reaction conditions such that a 1,2,3-trihalo-4,6-dinitrobenzene is produced, (b) contacting the 1,2,3-trihalo-4,6-dinitrobenzene prepared in (a) with an alkanol and a base under reaction conditions such that a 4,6-dinitro-2-halo-1,3-benzenediol is produced, and (c) contacting the 4,6-dinitro-2-halo-1,3-benzenediol prepared in (b) with a hydrogenating agent in the presence of a solvent and a catalyst under reaction conditions such that a 4,6-diamino-1,3-benzenediol is produced. This 4,6-diamino-1,3-benzenediol is useful in the preparation of high molecular weight polybenzoxazoles.

    ニトロ化反応器への水相のリサイクルによるニトロアルカン回収法
    480.
    发明专利
    ニトロ化反応器への水相のリサイクルによるニトロアルカン回収法 审中-公开
    通过水相回收对硝酸反应器进行硝酸还原的方法

    公开(公告)号:JP2015120763A

    公开(公告)日:2015-07-02

    申请号:JP2015074960

    申请日:2015-04-01

    CPC classification number: C07C201/06 B01J10/00 B01J19/00 C07C201/08 C07C201/16

    Abstract: 【課題】ニトロアルカン類の製造のためのより経済的でエネルギー効率の良い方法の提供。 【解決手段】少なくとも1つのニトロアルカンの合成方法であって、以下のステップ:反応器中で一定の反応器圧力と反応温度で炭化水素原料に含水硝酸を反応させて、ニトロ化化合物と副産物とを含む生成物流を生成させ、該生成物流を少なくとも油相、気相、及び水相とに分離し、ここで該油相と該水相は該ニトロ化化合物を含有し、該水相を吸収器の上流で第1の水相流と第2の水相流とに分割し 、ここで、該第1の水相流は、上記水相の65〜85%を含み 、該第1の水相流を該反応器に戻し、該第2の水相流を該吸収器に供給し、そして該油相と該第2の水相流の内の少なくとも1つから該少なくとも1つのニトロアルカンを回収する、を含む方法。 【選択図】なし

    Abstract translation: 要解决的问题:提供用于制造硝基烷烃的更经济和节能的方法。解决方案:合成至少一种硝基烷烃的方法包括:在反应器中在反应器压力和反应中使烃原料与硝酸水溶液反应 使得形成包含硝化化合物和副产物的产物流; 将产物流分离成至少油相,气相和水相,其中油相和水相含有硝化化合物; 将水相分成吸收器上游的第一含水物流和第二含水物流,其中第一含水物流含有65-85%的水相; 将第一含水流返回到反应器中; 将第二含水流供应到吸收器; 以及从至少一种油相和第二含水物流中回收至少一种硝基烷烃。

Patent Agency Ranking