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    • 9. 发明专利
    • Preparation of 2,6-dichloro-4-nitro-phenol
    • 2,6-二氯-4-硝基苯酚的制备
    • JPS5764646A
    • 1982-04-19
    • JP13930380
    • 1980-10-07
    • Sanwa Kagaku Kogyo Kk
    • KOBAYASHI SHIYOUJI
    • C07C205/26C07C67/00C07C201/00
    • PURPOSE: To obtain the titled compound useful as an agricultural chemical, an agent for photograph, etc. safely in high yield and industrially advantageously, by treating p-nitrophenol with conc. hydrochloric acid and hydrogen peroxide.
      CONSTITUTION: p-Nitrophenol is reacted with conc. hydrochloric acid having a concentration of ≥33% under cooling by a water bath containing ice at ≤10°C, and an aqueous solution of hydrogen peroxide having a concentration of ≥35wt% is added dropwise to the reaction mixture, The reaction mixture is kept 10W20°C for 1W2hr after the dropwise addition, the temperature is gradually raised upto 40W50°C and cooled to a room temperature Filtration and washing with water are carried out to give the titled compound.
      EFFECT: Since a by-product produced by the use of an aqueous solution of hydrogen peroxide is water, the filtrate of the reaction product contain no impurity at all, it can be used permanently and repeatedly by introducing hydrogen chloride to saturate it, and no bad waste water is discharged. The operation of this method in a plant to carry out a reaction preparing hydrogen chloride as a by-product can use effectively waste hydrogen chloride.
      COPYRIGHT: (C)1982,JPO&Japio
    • 目的:通过用浓缩的对硝基苯酚处理对硝基苯酚,以高产率和工业上安全地获得用作农药,照相剂等的标题化合物。 盐酸和过氧化氢。 构成:对硝基苯酚与浓缩物反应。 在含有<= 10℃的冰的水浴冷却下浓度> 33%的盐酸和浓度> 35wt%的过氧化氢水溶液滴加到反应混合物中 滴加后将反应混合物保持10-20℃1-2小时,温度逐渐升至40-50℃,冷却至室温,过滤并用水洗涤,得到标题化合物 。 效果:由于使用过氧化氢水溶液生成的副产物是水,反应产物的滤液根本不含杂质,可以通过引入氯化氢使其饱和而永久和重复使用,而不会 废水排放不良。 该方法在工厂中进行作为副产物制备氯化氢的反应的操作可以有效地使用废氯化氢。
    • 10. 发明专利
    • Production of cinnamic acid
    • 生产活性酸
    • JPS5764640A
    • 1982-04-19
    • JP13930180
    • 1980-10-07
    • Sanwa Kagaku Kogyo Kk
    • KOBAYASHI SHIYOUJI
    • C07C57/44B01J23/00B01J23/50C07B61/00C07C51/00C07C51/235C07C67/00
    • Y02P20/52
    • PURPOSE: When cinnamic acid is produced by oxidizing cinnamaldehyde with molecular oxygen, silver adsorbed on activated carbon is used as a catalyst, whereby cinnamic acid of high purity used as a starting material of perfume is produced in high yield with almost no formaton of resinous substances.
      CONSTITUTION: Using silver adsorbed on activated carbon as a catalyst, cinnamaldehyde is oxidized with molecular oxygen to produce purely white cinnamic acid giving more than 99% purity without recrystallization in a yield as high as 97W100% theoretically. Further, no resinous substance is formed to keep the catalyst clean and prolong the catalyst life almost permanently. The catalyst is prepared, e.g., by dissolving a water-soluble silver salt such as silver nitrate in water, adding a fine powder of active carbon and a water-soluble aldehyde reducing agent such as formaldehyde to the silver solution and dropping a conc. aqueous solution of caustic alkali to the mixture at 0±5°C. The content of silver is 30W300wt% based on the activated carbon.
      COPYRIGHT: (C)1982,JPO&Japio
    • 目的:当用分子氧氧化肉桂醛产生肉桂酸时,使用吸附在活性炭上的银作为催化剂,由此产生高纯度的用作香料起始原料的肉桂酸,几乎没有形成树脂状物质 。 构成:使用吸附在活性炭上的银作为催化剂,肉桂醛用分子氧氧化,产生纯白色肉桂酸,纯度高达99%,无重结晶,理论值高达97-100%。 此外,没有形成树脂状物质以保持催化剂清洁并且几乎永久地延长催化剂寿命。 催化剂例如通过将水溶性银盐如硝酸银溶解在水中,向银溶液中加入活性炭和水溶性醛还原剂如甲醛的细粉末并滴加浓缩液来制备。 0〜5℃的苛性碱水溶液混合。 基于活性炭,银的含量为30-300wt%。