中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

10 records (took 0.009 seconds)

    Process for the preparation of glycidyl ethers of monohydric or polyhydric phenols, the glycidyl ethers and use thereof
    1.
    发明授权
    Process for the preparation of glycidyl ethers of monohydric or polyhydric phenols, the glycidyl ethers and use thereof 失效
    一元或多元酚的缩水甘油醚的制备方法，缩水甘油醚及其用途

    公开(公告)号：US4373073A

    公开(公告)日：1983-02-08

    申请号：US209586

    申请日：1980-11-24

    Applicant: Bernhard Wojtech ,  Hans-Joachim Kiessling ,  Wilhelm Becker ,  Kurt Hermann

    Inventor： Bernhard Wojtech ,  Hans-Joachim Kiessling ,  Wilhelm Becker ,  Kurt Hermann

    IPC: B01J31/00 ,  C07B61/00 ,  C07D301/28 ,  C07D303/22 ,  C07D303/24 ,  C08G59/06 ,  C08G59/08

    CPC classification number: C07D303/22 ,  C07D303/24 ,  C08G59/063

    Abstract: Glycidyl ethers of monohydric or polyhydric phenols of high purity are obtained if hydrogen halide is eliminated from halohydrin ethers of the phenols in aqueous alkalis in the presence of one or more onium compounds selected from quaternary ammonium compounds having at least one aliphatic C.sub.4-22 hydrocarbon radical, quaternary phosphonium compounds and tertiary sulphonium compounds as catalyst, or in the presence of those compounds which form in the reaction medium in situ, before the addition of the alkali, such onium compounds from the halohydrin ethers together with tertiary amines, tertiary phosphines or thioethers. In comparison with the known processes, the rate of dehydrohalogenation can thereby be significantly increased as a result of which an increase in production is achieved. Moreover, significantly purer reaction products are obtained by the avoidance of side reactions. The glycidyl ethers may be used as low-viscosity casting and coating resins in the form of coatings, adhesives, moulding materials, etc., and conventional hardeners can be employed. Due to their low viscosity the workability of the glycidyl ethers is considerably better and the capacity to absorb filling materials is greater. The extremely low content of easily saponifiable halogen results in an especially favorable corrosion behavior.

    Abstract translation: 在一种或多种选自具有至少一个脂族C 4-22烃基基团的季铵化合物的鎓化合物存在下，在含水碱中的酚的卤代醇醚中除去卤化氢，得到高纯度的一元或多元酚的缩水甘油醚 ，作为催化剂的季鏻化合物和叔锍化合物，或在加入碱之前在原位形成反应介质中的那些化合物的存在下，卤代醇醚与叔胺，叔膦或硫醚一起形成的鎓化合物 。 与已知方法相比，脱卤化氢的速率因此可以显着增加，结果实现了生产的增加。 此外，通过避免副反应获得明显更纯的反应产物。 缩水甘油醚可以用作涂料，粘合剂，模塑材料等形式的低粘度浇铸和涂布树脂，并且可以使用常规的硬化剂。 由于它们的低粘度，缩水甘油醚的可加工性相当好，吸收填充材料的能力更大。 容易皂化的卤素含量极低，导致特别有利的腐蚀行为。

    Process for extracting N-methyl-2-pyrrolidone
    2.
    发明授权
    Process for extracting N-methyl-2-pyrrolidone 失效
    提取N-甲基-2-吡咯烷酮的方法

    公开(公告)号：US5068358A

    公开(公告)日：1991-11-26

    申请号：US419687

    申请日：1989-10-11

    Applicant: Georg-Emerich Miess ,  Karl-Heinz Schwarz ,  Heribert Tetzlaff ,  Bernhard Wojtech

    Inventor： Georg-Emerich Miess ,  Karl-Heinz Schwarz ,  Heribert Tetzlaff ,  Bernhard Wojtech

    IPC: C07D207/267 ,  C07D207/38

    CPC classification number: C07D207/38

    Abstract: The invention relates to a process for separating N-methyl-2-pyrrolidone (NMP) from aqueous solutions which are obtained in industry, inter alia, in the production of heat-resistance polymers such as polyamides and polyimides.According to the invention, the extractants used are phenols which are sparingly soluble in water, are aliphatically monosubstituted and/or polysubstituted in the nucleus and have 4 to 16 carbon atoms in the straight-chain or branched, saturated or unsaturated aliphatic radical and have a boiling point which is preferably at least 20.degree.-25.degree. C. above the boiling point of NMP. If necessary, an inert, viscosity-reducing diluent is added.

    Abstract translation: 本发明涉及从工业上获得的水溶液中分离N-甲基-2-吡咯烷酮（NMP）的方法，特别是在生产耐热聚合物如聚酰胺和聚酰亚胺时。 根据本发明，所使用的萃取剂是微溶于水的酚，在核中脂肪单取代和/或多取代，在直链或支链，饱和或不饱和脂族基团中具有4至16个碳原子，并具有 沸点优选在NMP沸点以上至少20°-25℃。 如果需要，加入惰性的减粘稀释剂。

    Purification of phosphoric acid by means of organic solvents
    4.
    发明授权
    Purification of phosphoric acid by means of organic solvents 失效
    通过有机溶剂纯化磷酸

    公开(公告)号：US4196180A

    公开(公告)日：1980-04-01

    申请号：US881516

    申请日：1978-02-27

    Applicant: Bernhard Wojtech ,  Klaus P. Ehlers ,  Wolfgang Scheibitz

    Inventor： Bernhard Wojtech ,  Klaus P. Ehlers ,  Wolfgang Scheibitz

    IPC: C01B25/46 ,  C01B25/22

    CPC classification number: C01B25/461 ,  C01B25/462

    Abstract: Contaminated phosphoric acid, particularly wet-processed phosphoric acid, is purified by extracting it from its aqueous solution by means of an organic solvent, which is immiscible or partially miscible with water and in which phosphoric acid is soluble, separating the phosphoric acid being dissolved in the organic solvent from extraction residue, and recovering the phosphoric acid from the organic solution.The aqueous phosphoric acid is more particularly mixed in a reaction zone, in a ratio by volume within the range 1:0.3 to 1:30, with a solvent having a boiling point higher than that of water or higher than that of the resulting water solvent-azeotrope, the phosphoric acid/solvent-mixture is heated to temperatures between the boiling point of water or of the said azeotrope and that of the solvent until distillation of substantially all uncombined water originally present in the mixture, and residue and resulting anhydrous phosphoric acid solution in the organic solvent are separated.

    Abstract translation: 污染的磷酸，特别是湿法处理的磷酸，通过与水不混溶或部分混溶并且其中可溶于磷酸的有机溶剂从其水溶液中提取而被纯化，将溶解的磷酸分离 来自萃取残余物的有机溶剂，并从有机溶液中回收磷酸。 磷酸水溶液在反应区域中以体积比在1:0.3至1:30的范围内更特别地混合，其中溶剂的沸点高于水或高于所得水溶剂的沸点 将该磷酸/溶剂混合物加热至沸点或沸点与所述共沸物和溶剂的沸点直到蒸馏出基本上所有未混合的水，最初存在于混合物中，残余物和得到的无水磷酸 分离有机溶剂中的溶液。

    Purification of phosphoric acid
    5.
    发明授权
    Purification of phosphoric acid 失效
    磷酸的纯化

    公开(公告)号：US3996336A

    公开(公告)日：1976-12-07

    申请号：US592188

    申请日：1975-07-01

    Applicant: Bernhard Wojtech ,  Klaus-Peter Ehlers ,  Wolfgang Scheibitz

    Inventor： Bernhard Wojtech ,  Klaus-Peter Ehlers ,  Wolfgang Scheibitz

    IPC: C01B25/234 ,  C01B25/18 ,  C01B25/46 ,  C01B25/16

    CPC classification number: C01B25/18 ,  C01B25/464

    Abstract: Phosphoric acid is purified. To this end, it is dissolved in an organic solvent completely miscible with water. More particularly, the phosphoric acid is mixed with a solvent having a boiling point higher than that of water or higher than that of the resulting azeotrope; the resulting solution is heated to temperatures between the boiling point of water or the azeotrope and that of the solvent for as long a period as necessary to distillatively free the solution from the bulk of uncombined water therein; and the phosphoric acid solution is separated from residue.

    Abstract translation: 纯化磷酸。 为此，将其溶解在与水完全混溶的有机溶剂中。 更具体地说，将磷酸与沸点高于水或高于所得共沸物的溶剂混合; 将所得溶液加热到水或共沸物的沸点与溶剂沸点之间的温度长达一段时间，以将溶液从其中的大部分未混合水蒸馏出来; 并将磷酸溶液与残留物分离。

Patent Agency Ranking