Process for separating mixtures of m- and p-dichlorobenzene
    1.
    发明授权
    Process for separating mixtures of m- and p-dichlorobenzene 失效
    分离对 - 二氯苯混合物的方法

    公开(公告)号:US5386067A

    公开(公告)日:1995-01-31

    申请号:US252154

    申请日:1994-06-01

    CPC分类号: C07C17/389

    摘要: Mixtures of m- and p-dichlorobenzene can be separated by treating such mixtures in the liquid phase with a pentasil zeolite at from 20.degree. to 250.degree. C., a filtrate enriched in m-dichlorobenzene being removed and the p-dichlorobenzene being obtained by desorption of the pentasil zeolite. The pentasil zeolites may contain, as exchangeable cations, protons, cations of the first or second main group of the Mendeleev Periodic System, cations of the rare earth metals or a mixture of a plurality thereof. In order to prepare the liquid phase a solvent is used that belongs to the group of cyclic saturated hydrocarbons having 5 to 15 carbon atoms, alkyl-substituted aromatic hydrocarbons having 8 to 12 carbon atoms, and halogen-substituted aromatic hydrocarbons having 6 to 10 carbon atoms and 1 to 3 halogen atoms. The solvents ethylbenzene, chlorobenzene, p-xylene, p-chlorotoluene and dichlorobenzene are excepted. A mixture of a plurality of these solvents may also be used.

    摘要翻译: 可以通过在20至250℃下用pentasil沸石处理液相中的这种混合物来分离对 - 二氯苯的混合物,除去富含间二氯苯的滤液,将对二氯苯由 五硅沸石的解吸。 戊二烯沸石可以包含作为可交换阳离子的质子,门多列夫周期系统的第一或第二主要组分的阳离子,稀土金属的阳离子或其多个混合物。 为了制备液相,使用属于具有5至15个碳原子的环状饱和烃基团,具有8至12个碳原子的烷基取代的芳族烃和具有6至10个碳原子的卤素取代的芳族烃的溶剂 原子和1至3个卤素原子。 溶剂乙苯,氯苯,对二甲苯,对氯甲苯和二氯苯除外。 也可以使用多种这些溶剂的混合物。

    Process for isolating M-dichlorobenzene from mixtures of dichlorobenzene
isomers
    4.
    发明授权
    Process for isolating M-dichlorobenzene from mixtures of dichlorobenzene isomers 失效
    从二氯苯异构体的混合物中分离M-二氯苯的方法

    公开(公告)号:US5436377A

    公开(公告)日:1995-07-25

    申请号:US300614

    申请日:1994-09-02

    IPC分类号: C07C17/392 C07C25/08

    CPC分类号: C07C17/392

    摘要: In a particularly advantageous process for isolating m-dichlorobenzene from mixtures of dichlorobenzene isomers by crystallization as eutectic crystals using a processing aid, the processing aid used is a compound of the formula (I) ##STR1## in which R.sup.1 to R.sup.6 are, independently of one another, hydrogen, halogen, C.sub.1 -C.sub.4 -alkyl, hydroxyl, NH.sub.2 or R--CO-- having R=C.sub.1 -C.sub.4 -alkyl,with 1-bromo-4-chlorobenzene and 1,4-dibromobenzene being excepted.

    摘要翻译: 在使用加工助剂通过结晶作为共晶晶体从二氯苯异构体的混合物中分离间二氯苯的特别有利的方法中,所用的加工助剂是式(I)化合物,其中R 1至R 6为 独立地是具有R = C 1 -C 4 - 烷基的氢,卤素,C 1 -C 4 - 烷基,羟基,NH 2或R-CO-,除了1-溴-4-氯苯和1,4-二溴苯外。