Process for the purification of crude
2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane
    1.
    发明授权
    Process for the purification of crude 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane 失效
    粗制2,2-二 - (3,5-二甲基-4-羟苯基) - 丙烷的纯化方法

    公开(公告)号:US4990686A

    公开(公告)日:1991-02-05

    申请号:US457419

    申请日:1989-12-27

    IPC分类号: C07C37/84 C07C39/16

    CPC分类号: C07C37/84

    摘要: Crude 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)propane (=tetramethyl-bisphenol A=TMBPA) can be purified by recrystallization, if C.sub.1 -C.sub.4 -monoalcohols with a water content of 2 to 40% by weight relative to the total weight of alcohol and water are used in an amount of 70 to 250% by weight, relative to the amount of TMBPA and the recrystallization is carried out at a temperature of 65.degree. to 150.degree. C.

    摘要翻译: 通过重结晶可以纯化2,2-二 - (3,5-二甲基-4-羟基苯基)丙烷(=四甲基 - 双酚A = TMBPA),如果水含量为2〜40%的C 1 -C 4 - 一元醇通过 相对于醇和水的总重量的重量相对于TMBPA的用量为70〜250重量%,在65〜150℃的温度下进行再结晶。

    Process for the preparation of dialkyl carbonates
    7.
    发明授权
    Process for the preparation of dialkyl carbonates 失效
    制备碳酸二烷基酯的方法

    公开(公告)号:US5288894A

    公开(公告)日:1994-02-22

    申请号:US958853

    申请日:1992-10-08

    CPC分类号: C07C68/00 Y02P20/582

    摘要: Dialkyl carbonates can be prepared by reaction of carbon monoxide with alkyl nitrites in a continuous gas phase reaction, in which a platinum metal catalyst of oxidic or hydroxidic compounds of elements from group Vb of the Periodic Table (Mendeleev) as supports and, if desired, addition of an antimony, bismuth, aluminium, copper, vanadium, niobium, tantalum, tin, iron, cobalt, nickel compound or a mixture of a plurality thereof on this catalyst are used, and the hydrogen halide which is discharged from the reactor together with the reaction mixture is batchwise or continuously replaced in the course of the reaction. This results in the formation of dialkyl carbonates in almost quantitative selectivity; the corresponding dialkyl oxalates can, in most cases, not be detected.

    摘要翻译: 碳酸二烷基酯可以通过一氧化碳与亚硝酸烷基酯在连续气相反应中的反应来制备,其中将元素周期表(Mendeleev)中元素的氧化或氢化化合物的铂金属催化剂作为载体,如果需要, 使用在该催化剂上添加锑,铋,铝,铜,钒,铌,钽,锡,铁,钴,镍化合物或其多种混合物,将从反应器排出的卤化氢与 反应混合物在反应过程中间歇或连续替代。 这导致几乎定量选择性形成碳酸二烷基酯; 在大多数情况下,相应的草酸二烷基酯可以不被检测。

    Process for preparing M-chlorobenzene sulphonyl chloride
    8.
    发明授权
    Process for preparing M-chlorobenzene sulphonyl chloride 失效
    制备间氯苯磺酰氯的方法

    公开(公告)号:US4012442A

    公开(公告)日:1977-03-15

    申请号:US559272

    申请日:1975-03-17

    IPC分类号: C07C143/70

    CPC分类号: C07C309/00

    摘要: Meta-chlorobenzene sulphonyl chloride and metadichlorobenzene are prepared by reacting benzene sulphonyl chloride with chlorine in the presence of a Friedel-Crafts catalyst at a temperature of from 0.degree. to 150.degree. C. After removing the catalyst, the resulting m-chlorobenzene sulphonyl chloride is reacted to form m-dichlorobenzene. The m-chlorobenzene sulphonyl chloride is preferably isolated prior to being reacted to m-dichlorobenzene. The reaction forming m-dichlorobenzene can be carried out via thermal clevage, thermal chlorolysis or chlorolysis initiated photochemically or by radicals.

    摘要翻译: 在Friedel-Crafts催化剂存在下,在0〜150℃的温度下,使苯磺酰氯与氯反应制备了邻 - 氯苯磺酰氯和偏二氯苯。除去催化剂后,得到的间氯苯磺酰氯为 反应形成间二氯苯。 间氯苯磺酰氯优选在与间二氯苯反应之前分离。 形成间二氯苯的反应可以通过热裂解,热解氯或由光化学或自由基引发的氯解来进行。

    Process for the preparation of 4,6-diaminoresorcinol
    9.
    发明授权
    Process for the preparation of 4,6-diaminoresorcinol 失效
    制备4,6-二氨基间苯二酚的方法

    公开(公告)号:US5574188A

    公开(公告)日:1996-11-12

    申请号:US549241

    申请日:1995-10-27

    摘要: 4,6-diaminoresorcinol can be prepared in a plurality of steps in such a way thata) 1,3-dichlorobenzene is nitrated with a mixed acid of HNO.sub.3, H.sub.2 SO.sub.4 and SO.sub.3 at 0 to 40.degree. C. in anhydrous H.sub.2 SO.sub.4,b) the resulting 1,3-dichloro-4,6/2,4-dinitrobenzene isomeric mixture is first reacted with benzyl alcohol in the presence of a strong base at -15.degree. C. to +15.degree. C. and then at 20.degree. to 40.degree. C. to give the dibenzyloxy compound andc) the 1,3-dibenzyloxy-4,6-dinitrobenzene isomer arising in pure form in b) is converted to the 4,6-diaminoresorcinol by catalytic hydrogenation.

    摘要翻译: 可以以多个步骤制备4,6-二氨基间苯二酚,使得a)在无水H 2 SO 4中在0至40℃下用HNO 3,H 2 SO 4和SO 3的混合酸硝化1,3-二氯苯,b) 所得的1,3-二氯-4,6 / 2,4-二硝基苯异构体混合物首先在强碱存在下在-15℃至+ 15℃下与苄醇反应,然后在20℃至 40℃,得到二苄氧基化合物,和c)在b)中以纯形式产生的1,3-二苄氧基-4,6-二硝基苯异构体通过催化氢化转化为4,6-二氨基间苯二酚。