共查询到20条相似文献,搜索用时 46 毫秒
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<正> 在制革生产过程中,铬皮屑是不可避免要产生的废料。目前,我国县以上的制革厂就有500多个,每年有千千万万张动物皮加工成革,由此产生不少下脚料和废料,如生皮渣、生皮屑、铬皮块和铬皮屑等,均占皮革总量的50%.前三者在国内巳用作制酸原料,而铬皮屑因细度小,重量轻,不易处理一直未被很好地用.在国内,虽然有些厂家曾用铬皮屑制备雷米邦和再生革.但用量甚少,且均未充分利用,其中包含有蛋白质部分。其实,铬皮 相似文献
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废皮屑生产蛋白—树脂型复鞣填充剂的研究 总被引:1,自引:0,他引:1
本文就利用铬鞣废皮屑生产制革用蛋白─树脂结合型复鞣填充剂的实验室生产工艺,以及不同配料比对之性能的影响进行了探索性研究。试验结果表明经该复鞣剂处理的革,既具有复鞣作用,又有填充效果,柔软性、丰满度、弹性均有改善,皮革的收缩温度有所提高。同时降低了复鞣剂的成本,解决了Cr3 对环境的污染,是一种有前途的新型复鞣填充剂。国内外皮革工业普遍采用树脂型践剂进行复探填充工艺。国内的皮革化工对丙烯酸类读剂倾注颇大精力,发展较快,产品从单一的森制功能,逐步发展成具有选择填充、助较、助染、加脂等多功能性操剂。对利用铬栓皮屑与丙烯酸树脂接枝共聚产物对皮革有填充复跌效果,国外已有报道’‘’。但批量生产用于皮革加工还未见报道。国内文献也仅做一般介绍,试验性研究未见报道‘’‘。我们利用皮革厂家的下脚料一铬族废皮屑生产不同配料比的蛋白质一树脂,结合型复较填充剂,并用于皮革生产试验,企图体现蛋白、树脂的双重复秩填充效果。同时综合利用,变废为宝,解决废皮屑中Cr‘”对环境的污染。 相似文献
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<正> 利用制革工业废料铬鞣革皮制造工业明胶,为制胶工业开创了新的原料来源,既可变废为宝,又有利于环境保护。那么,如何制取优质的低含铬量的明胶呢?这就必须通过中间检测和控制手段,对原材料在生产过程中形成的半成品质量严格加以控制把关,并根据生产过程中的具体情况进行调整,为提高产品质量提供可靠的保证。铬鞣革皮(蓝矾皮)制取工业明胶的生产工艺流程为: 铬鞣革皮→碱处理→水冼→酸处理→水冼中和→熬胶→过滤→浓缩→干燥→粉碎。依据我厂在生产过程中的中间控制状况,就如何加强铬鞣革皮制取明胶的中间控制介绍如下: 一、中间控制人员的配备中间控制人员必须要有较高的文化水平和较强的责任感,有丰富的实践经验和专业技术,人员需要保持相对的稳定。 相似文献
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本文设计并研制了KMC系列A、B、C三型自动碱化蒙铬鞣粉剂。用离子交换色谱、凝胶色谱对粉剂鞣液的组成进行了研究,结果发现:粉剂刚溶解时,鞣液中主要为带负电或不带电的小分子配合物;鞣液陈放后,带正电的大分子配合物增多,鞣液中组分数增多,电荷、分子大小和组分铬含量分布趋于均匀。用可见光谱和红外光谱证明配合物内界中有机酸根参与了配位。KMC系列组成的特征与鞣荆分子设计的要求相符。鞣革试验结果表明:KMC鞣制的革比各厂自配铬鞣液鞣制的革更柔软丰满,粒面更细致,鞣剂在革内分布更均匀,完全可以代替进口的同类型产品BaychromF鞣剂,更可以代替各厂自配的铬鞣液,而且操作简单、节省劳力、污染减少,值得推广。 相似文献
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利用自制改性ZSM-5型分子筛催化剂,对废塑料催化裂解制备汽油、柴油的工艺过程和影响因素进行了分析研究。结果表明该催化剂具有活性高、使用寿命长、稳定性好及油品产率高等优点,适合市场推广使用。 相似文献
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Iris L. M. Verschuren Johan G. Wijers Gert Jan H. A. Schoenmakers Frank J. H. Jeurissen Jos T. F. Keurentjes 《Chemical Engineering Communications》2001,188(1):59-79
In semi-batch or continuously stirred reactors, often a feed containing one or more reactants has to be mixed with the contents of the vessel. For fast competitive or consecutive reactions the mixing rate of the feed stream with the vessel contents has a large influence on the product quality. The mixing rate is often controlled by the turbulent dispersion process. Therefore, it has been suggested in the literature to keep the turbulent dispersion time constant upon scale-up to obtain a constant product quality. In this study, based on a combination of a theoretical model, Planar Laser Induced Fluorescence experiments and Laser Doppler Velocimetry experiments, the turbulent dispersion coefficient is determined. This has been done for the case that a feed stream is mixed in a stirred vessel by a combination of feed stream and stirrer generated turbulence. The turbulent dispersion coefficient is used to derive an equation for the turbulent dispersion time as function of several design and process variables. 相似文献
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IRIS L. M. VERSCHUREN JOHAN G. WIJERS GERT JAN H. A. SCHOENMAKERS FRANK J. H. JEURISSEN JOS T. F. KEURENTJES 《Chemical Engineering Communications》2013,200(1):59-79
In semi-batch or continuously stirred reactors, often a feed containing one or more reactants has to be mixed with the contents of the vessel. For fast competitive or consecutive reactions the mixing rate of the feed stream with the vessel contents has a large influence on the product quality. The mixing rate is often controlled by the turbulent dispersion process. Therefore, it has been suggested in the literature to keep the turbulent dispersion time constant upon scale-up to obtain a constant product quality. In this study, based on a combination of a theoretical model, Planar Laser Induced Fluorescence experiments and Laser Doppler Velocimetry experiments, the turbulent dispersion coefficient is determined. This has been done for the case that a feed stream is mixed in a stirred vessel by a combination of feed stream and stirrer generated turbulence. The turbulent dispersion coefficient is used to derive an equation for the turbulent dispersion time as function of several design and process variables. 相似文献
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Siva Ariyapadi Franco Berruti Ram Balachandar 《Chemical Engineering Communications》2003,190(12):1681-1704
The spray characteristics of a scaled-down version of an industrial feed nozzle are studied in the presence of a cross flow. Aerated liquid nitrogen is injected through the nozzle to generate the spray. The aeration rate is low and held constant, while two different liquid flow rates are used to produce the spray. A nonuniform wind profile is chosen to represent the cross flow condition. The droplet diameter and velocity measurements are acquired using a phase-Doppler particle analyzer. The results of the present study indicate that the spray momentum flux determines the extent of the jet bending. The droplets are accelerated significantly in the initial jet region as a result of flashing. However, further downstream of the nozzle, the vaporization of the droplets is considered to be negligible. The size-velocity correlation changes significantly for the case where the spray is shifted due to the cross flow. 相似文献
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针对酚氧化降解过程中生成的微量和解中间产物-对苯醌,能与2,4-二硝基苯肼形成黄绿色化合物的特点,提出了光度分析法,并对其测试条件及影响因素进行了探讨,同时考察了该法在测定条件下的准确度和精密度。 相似文献