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    • 2. 发明申请
    • A PROCESS FOR OBTAINING 4,4'-DICHLORODIPHENYL SULFONE
    • US20220274923A1
    • 2022-09-01
    • US17635031
    • 2020-08-20
    • BASF SE
    • Jessica Nadine HAMANNLukas Karl METZGERStefan BLEl
    • C07C315/06
    • The invention relates to a process for obtaining 4,4′-dichlorodiphenyl sulfone from an organic mixture comprising 4,4′-dichlorodiphenyl sulfone and a linear C6 to C10 carboxylic acid as organic solvent, comprising: (a) cooling the organic mixture by (a1a) mixing the organic mixture with water in a crystallization vessel to obtain a liquid mixture; (a1b) cooling the liquid mixture obtained in (a1a) to a temperature below the saturation point of 4,4′-dichlorodiphenyl sulfone by (i) reducing the pressure in the crystallization vessel to a pressure at which the water starts to evaporate, (ii) condensing the evaporated water by cooling, (iii) mixing the condensed water into the liquid mixture in the crystallization vessel, to obtain a suspension comprising crystallized 4,4′-dichlorodiphenyl sulfone; or by (a2) bringing the organic mixture into contact with at least one coolable surface and thereby reducing the temperature in the organic mixture with a cooling rate in the range from 5 to 50 K/h until a temperature in the range from 10 to 30° C. is reached, wherein the organic mixture and the at least one coolable surface have a temperature difference which is kept during the whole cooling process in the range from 1 to 30 K to obtain a suspension comprising crystallized 4,4′-dichlorodiphenyl sulfone. (b) carrying out a solid-liquid-separation of the suspension obtained in (a1b) or in (a2) to obtain a residual moisture containing solid 4,4′-dichlorodiphenyl sulfone as product and mother liquor comprising the organic solvent and water.
    • 9. 发明申请
    • DMSO PURIFICATION
    • DMSO纯化
    • US20150126780A1
    • 2015-05-07
    • US14069621
    • 2013-11-01
    • DMSO SOLUTIONS, LLC
    • Claude Bloom
    • C07C315/06
    • C07C315/06B01D9/00C07C317/04
    • Methods and apparatus for purifying DMSO are disclosed including a method of purifying DMSO involving providing a first DMSO composition having impurities; freezing a portion of the first DMSO composition on a first surface to form a second DMSO composition having higher DMSO purity than the first DMSO composition such that a third DMSO composition remains from the unfrozen portion of the first DMSO composition; separating the second DMSO composition from the third DMSO composition; and melting a portion of the second DMSO composition. The freezing of the portion of the first DMSO composition, the separating of the second DMSO composition from the third DMSO composition, and the melting of the portion of the second DMSO composition may happen simultaneously. DMSO purification apparatus employing such methods and other methods are also taught.
    • 公开了用于纯化DMSO的方法和装置,其包括提供包含提供具有杂质的第一DMSO组合物的DMSO的方法; 在第一表面上冷冻第一DMSO组合物的一部分以形成具有比第一DMSO组合物更高的DMSO纯度的第二DMSO组合物,使得第三个DMSO组合物从第一个DMSO组合物的未冷冻部分残留; 将第二DMSO组合物与第三DMSO组合物分离; 并溶解一部分第二DMSO组合物。 第一种DMSO组合物的部分冷冻,第二种DMSO组合物与第三种DMSO组合物的分离以及该部分第二种DMSO组合物的熔融可能同时发生。 还教导了使用这些方法的DMSO净化装置和其它方法。