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    • 3. 发明公开
    • Removal of chromium from chrome-tanned leather wastes
    • Chrom-Entfernung ausChromlederabfällen。
    • EP0567671A1
    • 1993-11-03
    • EP92107176.7
    • 1992-04-28
    • Siska, Jozef
    • Siska, Jozef
    • C14C3/32C02F9/00C22B34/32
    • C22B34/32C02F1/5236C02F2103/24C14C3/32Y02P10/234Y02W30/76
    • Chrome-tanned leather wastes in a form of shavings, trimmings and grindings is first mechanically treated by cutting. The cut leather material is washed in a leaching solution containing hydrogen peroxide and potassium carbonate and/or hydrogen carbonate and/or sodium carbonate and/or hydrogen carbonate. Washing takes place in stages, using a counter-flow method, at room temperature and with occasional stirring. The exhaused leaching solution is used to prepare chrome-tannig bath directly or after acidification using sulphuric acid. After washing, leather material is rinsed using rinsing water. Residues of chromium are removed from rinsing water by precipitation with ferrous sulphate, and the filtration sludges thus obtained can be added to the exhausted leaching solution and/or chrome-tanning bath. The washed leather material is dehydrated by pressing and wet collagen product is obtained.
    • 首先通过切割机械处理以刨花,修边和研磨的形式的铬鞣皮革废料。 将切割的皮革材料在含有过氧化氢和碳酸钾和/或碳酸氢盐和/或碳酸钠和/或碳酸氢盐的浸出溶液中洗涤。 洗涤分阶段进行,使用逆流法,在室温下偶尔搅拌。 经过浸出的浸出溶液可直接制备铬酸锡浴,或用硫酸酸化后制备。 洗涤后,用冲洗水冲洗皮革材料。 通过用硫酸亚铁沉淀从冲洗水中除去铬残留物,并将由此获得的过滤污泥加入到排出的浸出溶液和/或铬鞣浴中。 洗涤的皮革材料通过压制脱水,得到湿胶原产物。
    • 6. 发明公开
    • METHODS AND PRODUCTS USEFUL IN RECOVERING AND RECYCLING TANNINS
    • 方法和产品可用于回收和再循环宁静
    • EP1377711A1
    • 2004-01-07
    • EP02717658.5
    • 2002-03-15
    • McGraw, Wayne G.
    • McGraw, Wayne G.
    • D06P3/32C09B61/00C09B67/34C14C1/06C14C3/00C14C3/10
    • C14C3/32C14C3/10C14C3/30Y02W30/76
    • The present invention relates to a novel method of recovering and recycling active tannins from spent vegetable tanning liquors. Using a low molecular weight alcohol as the extraction agent produces an alcohol fraction or precipitate containing extracted active tannins, and leaves virtually all non-tannins in the aqueous phase of the spent tanning liquor. The methods and resulting chemical mixtures of the present invention have a variety of uses and applications. The method can be applied to freshly produced or aged spent vegetable tanning liquors. The methods are further applicable to dried forms of spent tanning liquors through aqueous reconstitution of dried ReTan, followed by alcohol extraction. The recovered chemical mixture contains recovered tannins which can be recycled through combination with fresh tanning liquors to form an improved tanning liquor.
    • 本发明涉及从废植物鞣革液中回收和再循环活性单宁的新方法。 使用低分子量醇作为提取剂产生含有提取的活性单宁的醇馏分或沉淀物,并且在废鞣液的水相中实际上留下所有非鞣质。 本发明的方法和所得的化学混合物具有各种用途和应用。 该方法可以应用于新鲜生产或陈年的植物鞣制液。 这些方法还可通过干燥的ReTan水溶液重建,然后进行酒精提取,应用于废晒黑液的干燥形式。 回收的化学混合物含有回收的丹宁酸,其可通过与新鲜鞣制液组合而再循环以形成改进的鞣液。
    • 8. 发明公开
    • CHROMIUM TANNING PROCESS WITH REDUCED WASTE DISCHARGE
    • CHROM-GERBVERFAHREN MIT REDUZIERTEM ABFALLAUSTRAG
    • EP3045548A2
    • 2016-07-20
    • EP15003637.4
    • 2015-12-21
    • Zhang, Zhuangdou
    • Zhang, Zhuangdou
    • C14C1/00C02F1/00C14C3/06C14C3/28C14C3/32
    • C14C3/32C14C1/00C14C3/06C14C3/28Y02W30/76
    • A tanning process reduces discharges of liquid waste, solid waste and gaseous waste. By virtue of liquid waste recycling, the process reduces solid material digestion or decomposition, and converts wastes to reusable materials. Liquid waste and solid waste are also reduced. Chemical material volatilization is also reduced, which helps to reduce gaseous waste discharge. The liquid waste recycling procedures are implemented independently in the steps of waster soaking, liming, re-liming, de-liming and softening, pickling and chrome tanning, degreasing, re-tanning, neutralizing and dyeing. The process reduces water consumption by more than 70%, and reduces energy consumption by more than 20%. In addition, the process reduces solid waste discharge by over 70%, thereby saving 15% to 100% of chemical materials, as well as reducing air pollution caused by chemical material volatilization. The process significantly improves leather quality.
    • 鞣制过程减少了液体废物,固体废物和气体废物的排放。 由于废液循环利用,该方法可减少固体物质的消化或分解,并将废物转化为可重复利用的材料。 液体废物和固体废物也减少了。 化学物质挥发也减少,有助于减少气体废物排放。 液体废物回收程序是在浸泡,浸灰,再石灰,去石灰和软化,酸洗和铬鞣,脱脂,再鞣制,中和染色的步骤中独立实施的。 该工艺将耗水量降低70%以上,能耗降低20%以上。 此外,该方法将固体废物排放量减少70%以上,从而节省化学材料15%〜100%,减少化学物质挥发造成的空气污染。 该过程显着提高皮革质量。