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891 条记录 (耗时 0.039 秒)

    PRODUCTION OF DICHLOROBENZENE
    91.
    发明专利
    PRODUCTION OF DICHLOROBENZENE 失效

    公开(公告)号：JPH04128245A

    公开(公告)日：1992-04-28

    申请号：JP24921590

    申请日：1990-09-19

    申请人： TOA GOSEI CHEM IND

    发明人： KATO MASATOSHI ,  ITO NAOKAZU ,  YOSHIDA TERUO

    IPC分类号： B01J21/04 ,  C07B61/00 ,  C07C17/12 ,  C07C25/08

    摘要： PURPOSE:To maintain chlorine conversion ratio in a high ratio for many hours and to produce the title substance having a large content of p-dichlorobenzene by chlorinating benzene and/or monochlorobenzene having a specific water content by the use of active alumina having a long life as a catalyst. CONSTITUTION:In producing dichlorobenzene by chlorinating benzene (BZ) and/or monochlorobenzene, active alumina is used as a catalyst, BZ and/or CB having

    92.
    发明专利
    失效

    公开(公告)号：JPH0420413B2

    公开(公告)日：1992-04-02

    申请号：JP18364486

    申请日：1986-08-05

    申请人： KUREHA CHEMICAL IND CO LTD

    发明人： OOTSURU MASAFUMI ,  HOZUMI TOSHIO

    IPC分类号： B01J27/128 ,  B01J27/00 ,  B01J27/02 ,  B01J27/043 ,  B01J27/10 ,  B01J27/125 ,  C07B61/00 ,  C07C17/00 ,  C07C17/12 ,  C07C17/361 ,  C07C25/02 ,  C07C67/00

    摘要： Disclosed herein is a process for producing 2,5-dichlorotoluene which is useful as a monomer of heat-resistant polymers and an intermediate raw material for medicine, agricultural chemicals and various organic synthetic substances. The process gives 2,5-dichlorotoluene at a high selectivity and in a high yield. It comprises the steps of chlorinating 4-t-alkyltoluene or 4-isopropyltoluene in the presence of a catalyst, thereby obtaining a 2,5-dichloro compound, and bringing the formed 2,5-dichlorocompound into contact with toluene in the presence of a catalyst, thereby subjecting the 2,5-dichloro compound to transalkylation.

    PRODUCTION OF 2,4-DICHLOROFLUOROBENZENE
    93.
    发明专利
    PRODUCTION OF 2,4-DICHLOROFLUOROBENZENE 失效

    公开(公告)号：JPH041145A

    公开(公告)日：1992-01-06

    申请号：JP9987690

    申请日：1990-04-16

    申请人： TORAY INDUSTRIES

    发明人： MATSUOKA SHOTARO ,  TADA KUNIYUKI

    IPC分类号： B01J29/08 ,  B01J29/70 ,  C07B61/00 ,  C07C17/12 ,  C07C25/13 ,  B01J29/28

    摘要： PURPOSE:To readily and with high selectivity obtain the subject 2,4- dichlorofluorobenzene useful as a raw material for medical and agricultural agents under a mild condition on one step by chlorinating fluorobenzene in the presence of a zeolite-containing catalyst. CONSTITUTION:Fluorobenzene is chlorinated using a catalyst containing a zeolite, preferably Y-type or L-type zeolite in an amount of 0.5-30g, preferably 1-10g based on 1mol fluorobenzene at 20-200 deg.C, preferably 40-130 deg.C to high selectively synthesize 2,4-dichlorofluorobenzene especially useful as an intermediate of a quinolonecarboxylic acid anti-fungus agent, etc., while inhibiting generation of by-products such as 3.4-isomer, 2.5-isomer and 2.6-isomer. In addition, the above-mentioned method can be carried out with an industrial advantage because of its mild reaction condition and readiness of operations during the reaction or after the reaction.

    PRODUCTION OF FLUOROBENZENE
    98.
    发明专利
    PRODUCTION OF FLUOROBENZENE 失效

    公开(公告)号：JPH03106838A

    公开(公告)日：1991-05-07

    申请号：JP23840089

    申请日：1989-09-16

    申请人： MITSUI TOATSU CHEMICALS

    发明人： HARADA ISAO ,  YODA YUKIHIRO ,  KAMANOHARA HISASHI ,  KURODA TAKASHI

    IPC分类号： C07C25/13 ,  C07C17/093 ,  C07C17/12

    摘要： PURPOSE:To continuously obtain the subject substance by adding aniline and a nitrous acid donor to anhydrous HF, diazotising at specific temperature, continuously feeding the resultant diazonium salt into a reaction vessel with overflow and pyrolytically decomposing at specific temperature. CONSTITUTION:Aniline and a nitrous acid donor (e.g. NaNO2) are added to anhydrous HF and reacted at 10 deg.C to -40 deg.C (preferably from -10 deg.C to -40 deg.C), then the resultant diazonium salt is pyrolytically decomposed at 30-84.7 deg.C to continuously obtain fluorobenzene. The pyrolytical decomposition is performed for 30-120min using a solution containing fluorobenzene and/or 60-90wt.% HF as a heating medium in a reaction vessel 4 having condenser 6, stirrer 5, overflow pipe 7 and extracting valve 8. Reacting solution is introduced to cooling tank 10 through overflow pipe 7. By said method, the aimed substance is able to be safely mass produced in a low cost without runaway nor clogging, etc., in the reaction.