Separation of m- and p-dichlorobenzene
    2.
    发明授权
    Separation of m- and p-dichlorobenzene 失效
    对 - 二苯并苯的分离

    公开(公告)号:US5152875A

    公开(公告)日:1992-10-06

    申请号:US681891

    申请日:1991-04-08

    CPC分类号: C07C17/386

    摘要: A process for separating m- and p-dichlorobenzene by extractive rectification with an extractant and removal of this extractant. Using as extractant an alkylene carbonate of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical to or different from one another and each is hydrogen, methyl or ethyl, with the proviso that together the radicals R.sup.1 to R.sup.4 do not contain more than 6 carbon atoms.The process of the invention makes it possible to separate off the m-isomer in high purity.

    摘要翻译: 通过萃取剂萃取精馏分离间二氯和对二氯苯并除去该萃取剂的方法。 使用作为萃取剂的式(I)的碳酸亚烷酯,其中R 1,R 2,R 3和R 4彼此相同或不同,并且各自为氢,甲基或乙基,条件是基团R 1至R 4 不含6个以上碳原子。 本发明的方法使得可以以高纯度分离出m-异构体。

    Process for preparing aromatic hydroxycarboxylic acids
    4.
    发明授权
    Process for preparing aromatic hydroxycarboxylic acids 失效
    制备芳族羟基羧酸的方法

    公开(公告)号:US5532406A

    公开(公告)日:1996-07-02

    申请号:US245962

    申请日:1994-05-19

    CPC分类号: C07C51/15

    摘要: A process for preparing aromatic hydroxycarboxylic acids or di-salts thereof by reaction of alkali metal phenolates or naphtholates with carbon dioxide, in the presence or absence of a further alkali metal salt, which comprises introducing the solid phenolate or naphtholate starting materials and, if desired, the alkali metal salt into the reaction mixture batchwise or continuously, separately or together, in the form of a dispersion in an inert organic liquid.The process of the invention makes possible the preparation of aromatic hydroxycarboxylic acids in good yields and with high chemical selectivity. Additional measures for increasing the selectivity, as are described for the Kolbe-Schmitt reaction in, for example, EP-A 0 053 824, EP-A 0 081 753 and EP-A 0 254 596, can be omitted.

    摘要翻译: 在存在或不存在另外的碱金属盐的情况下,碱金属酚盐或萘酚与二氧化碳反应制备芳族羟基羧酸或其二盐的方法,其包括引入固体酚盐或萘甲酸酯起始原料,如果需要 将碱金属盐以分散体的形式分批地或连续地分别或一起进入反应混合物中,以分散体的形式存在于惰性有机液体中。 本发明的方法可以以良好的产率和高的化学选择性制备芳族羟基羧酸。 如在例如EP-A 0 053 824,EP-A 0 081 753和EP-A 0 254 596中描述的用于Kolbe-Schmitt反应的增加选择性的其它措施可以省略。

    Process for the preparation of pure trioxane
    5.
    发明授权
    Process for the preparation of pure trioxane 失效
    纯三恶烷的制备方法

    公开(公告)号:US5401859A

    公开(公告)日:1995-03-28

    申请号:US072761

    申请日:1993-06-07

    IPC分类号: B01D9/02 C07D323/06

    CPC分类号: C07D323/06

    摘要: In the process for the preparation of pure trioxane by continuous or semicontinuous crystallization processes, if alkaline organic compounds are added no flocks appear after more than 120 hours of operation. As a result, blockage of the crystallization unit is prevented and problem-free running is made possible.

    摘要翻译: 在通过连续或半连续结晶方法制备纯三恶烷的过程中,如果添加碱性有机化合物,则在120多小时的操作后不会出现绒毛。 结果,阻止了结晶单元的堵塞,并且无故障运行成为可能。

    Process for the preparation of a dioxane adduct of
2-hydroxynaphthalene-6-carboxylic acid
    6.
    发明授权
    Process for the preparation of a dioxane adduct of 2-hydroxynaphthalene-6-carboxylic acid 失效
    制备2-羟基萘-6-羧酸二恶烷加合物的方法

    公开(公告)号:US5047558A

    公开(公告)日:1991-09-10

    申请号:US480080

    申请日:1990-02-14

    IPC分类号: C07C65/11 C07D319/12

    CPC分类号: C07C65/11 C07D319/12

    摘要: The invention relates to the dioxane adduct of 2-hydroxynaphthalene-6-carboxylic acid which adduct comprises 1 mol of 1,4-dioxane and about 2 mol of 2-hydroxynaphthalene-6-carboxylic acid per mol. The invention further relates to a process for the preparation of this adduct, wherein the 2-hydroxynaphthalene-6-carboyxlic acid is dissolved in dioxane or a mixture thereof with water or with an organic solvent and then allowed to crystallize.

    摘要翻译: 本发明涉及2-羟基萘-6-羧酸的二恶烷加合物,该加合物包含1mol 1,4-二恶烷和约2mol 2-羟基萘-6-羧酸/ mol。 本发明还涉及一种制备该加合物的方法,其中将2-羟基萘-6-羧酸溶于二恶烷或其与水或有机溶剂的混合物中,然后使其结晶。

    Process for the preparation of 2-hydroxynaphthalene-6-carboxylic acid
    7.
    发明授权
    Process for the preparation of 2-hydroxynaphthalene-6-carboxylic acid 失效
    2-羟基萘-6-羧酸的制备方法

    公开(公告)号:US5808142A

    公开(公告)日:1998-09-15

    申请号:US305406

    申请日:1994-09-13

    CPC分类号: C07C51/10 C07C51/38

    摘要: A process for the preparation of 2-hydroxynaphthalene-6-carboxylic acid using potassium carbonate and CO at temperatures above 260.degree. C. and at a pressure of at least 10 bar comprises using 2-hydroxynaphthalene-3-carboxylic acid and/or 2-hydroxynaphthalene-3,6-dicarboxylic acid and/or their potassium salts and, if desired, potassium .beta.-naphtholate as starting materials. The process according to the invention enables a considerable increase, by reusing the secondary products, in the product selectivity with regard to 2-hydroxy-naphthalene-6-carboxylic acid.

    摘要翻译: 使用碳酸钾和CO在高于260℃和至少10巴的压力下制备2-羟基萘-6-羧酸的方法包括使用2-羟基萘-3-甲酸和/或2-羟基萘-3-羧酸, 羟基萘-3,6-二羧酸和/或其钾盐,如果需要,可以将β-萘酚钾作为起始原料。 根据本发明的方法通过重新使用二次产物可以相对于2-羟基 - 萘-6-羧酸的产物选择性而显着增加。