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1996年4月24~25日来自全国化工、石化、轻工、医药、纺织、机电、中国科学院、大专院校的122个单位150名专家和企业家参加了会议。会议交流了学术报告37篇,总结了近年来我国生物化工、橡塑助剂、农药、染料和医药中间体科研和生产取得的成绩:研讨了国内外发展趋势和市场的需求;找出了差距和存在的问题;明确了“九五”的发展方向,提出了对策和建议。发布了有关研究开发的成果、可供转让的新技术、新工艺和新产品的信息。 相似文献
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《化学工业与工程技术》2019,(1):17-23
介绍了丁二烯装置溶剂精制工艺流程,分析了溶剂精制系统中产生的焦油、丁二烯二聚物及废水三大污染源及其危害。制定并实施了工艺改进措施,经过改进排焦工艺、丁二烯二聚物脱除工艺、溶剂精制系统脱水工艺,实现了排焦作业密闭操作、减少了作业过程带来的现场异味污染、消除了焦油池内人工开挖焦油带来的高风险作业、减少了装置废渣生成量、COD排放总量得到了控制,达到了净化溶剂品质、规避环保风险、节约资源、环境友好的生产目标,提高了装置运行质量,同时丁二烯二聚物污染源转化为副产品销售,增加了装置的经济效益。 相似文献
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《新世纪水泥导报》2015,(6)
针对预分解窑水泥熟料煅烧过程特性,通过采用神经网络算法,研究生产过程采集的实时数据,经数据分析、处理,建立适合水泥熟料煅烧过程的控制模型,采用多变量、非线性模型预测控制技术,建立了质量控制器、产量控制器、生料喂料控制器、风量优化控制器、分解炉控制器、回转窑控制器、篦冷机控制器、虚拟在线分析仪VOA等,实现了水泥熟料煅烧过程的闭环优化控制。在常山南方水泥的应用证明,熟料煅烧过程优化控制器的应用稳定了分解炉、回转窑、篦冷机的运行工况,增加了熟料产量,降低了燃料消耗,延长了回转窑耐火材料寿命,提高了熟料产品质量,统一了中控操作,消除了班次的操作差异,减轻了操作员劳动强度,取得了较好的效益。 相似文献
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邻甲苯酚的开发与市场前景 总被引:1,自引:0,他引:1
介绍了邻甲苯酚的性质、生产方法、概述了它在农药、香料、医药、染料、合成树指、抗氧剂等方面的应用,分析了国内外的生产现状,评价了苯酚烷基化法的技术经济情况。 相似文献
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王大全 《精细与专用化学品》1996,(12)
1996年4月24~25日,在浙江省湖州市召开了全国生物化工、橡塑助剂、农药、染料和医药中间体的学术交流会。来自全国化工、石化、轻工、医药、纺织、机电、中国科学院以及大专院校的122个单位150名代表参加了会议。 会议交流了生物化工、橡塑助剂、农药、染料和医药中间体的学术报告37篇,总结了近年来我国科研和生产取得的成绩,研讨了国内外发展趋势和市场需求,找出了差距和存在的问题,明 相似文献
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新型水溶性壳聚糖衍生物的制备 总被引:4,自引:0,他引:4
以醋酸和丙酮为反应介质,利用马来酸酐在均相条件下对壳聚糖进行水溶性N-酰化改性;与壳聚糖相比,改性后的壳聚糖衍生物的水溶性有了很大改善。实验表明:对壳聚糖的N-酰化改性程度越高,其改性产物的水溶性越好;同时,制备的3种样品的产率均在90%以上。 相似文献
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甲壳质及其衍生物的制备与应用 总被引:11,自引:0,他引:11
甲壳质是一种丰富的天然资源。近年来,甲壳质及其衍生物的开发应用受到国内外的重视,越来越多的产品将从实验室走向市场,本文介绍了甲壳质及其衍生物的制备方法及其在工业、农业、医药、环保、生物学等领域的应用。 相似文献
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甲壳素与甲壳胺纤维 3.纤维的化学改性 总被引:2,自引:2,他引:0
作为天然高分子材料,甲壳素和甲壳胺有许多优良的物化和生物活性。通过化学改性,甲壳素和甲壳胺可以获得更多的性能。总结了甲壳素和甲壳胺的化学衍生物和各种复合材料。 相似文献
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The vibrational modes and the purity index of chitin and its derivatives as biopolymers are studied by Fourier transform infrared spectroscopy in the wavenumber range from 4000 to 400 cm?1. The absorption bands of chitin and its derivatives are assigned. New bands appeared at 1419, 1209, 915, and 800 cm?1 for chitin derivatives due to the change of vibrational modes. The purity indexes are calculated from the ratio of the absorption band of C = O at 1662 cm?1 and OH at 3443 cm?1. Generally, the purity indexes of chitin derivatives are higher than that of chitin, which is due to the decrease of OH. The dielectric properties such as the real part of the dielectric constant (ε′) and loss tangent tan (δ) are measured as a function of temperature at different frequencies ranging from 200 to 2000 kHz. The increase of (ε′) and tan (δ) with increasing temperature is discussed on the basis of increasing polarizability and the decrease with increasing frequency can be attributed to the dielectric dispersion. AC electrical conductivities as a function of the reciprocal of the absolute temperature are also discussed. The mechanism of the charge carrier is discussed as a tunneling model in the temperature range from 300 to 360 K. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 936–943, 2005 相似文献
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Water‐soluble hydroxypropyl chitin (HPC) derivatives were prepared by the reaction of chitin with propylene oxide in homogeneous conditions using a dimethylacetamide/5% lithium chloride solvent system. The reaction conditions for a proper substitution of the hydroxypropyl group were an 80°C reaction temperature, 24‐h reaction time, and 48‐h aging time. 1H‐NMR and 13C‐cross‐polarization/magic angle spinning NMR spectroscopy were used for determining the substitution value and reaction site of substitution. It was found that the substitution reaction occurred mainly at the C6? OH group in the chitin molecules and water‐soluble chitin derivatives could be obtained at a substitution value higher than 0.35, which is known as a critical substitution value. X‐ray diffraction analysis and FTIR spectroscopy showed that the structural characteristics of HPC derivatives were dependent on the substitution value. As the substitution value of the HPC derivative increased the α‐chitin crystal structure changed to the water‐soluble β‐chitin form in higher substitution values. Differences in the interchenic hydrogen bonding, interplanar spacing of the crystal lattice plane, and crystallinity can explain the structural changes upon substitution. The thermal decomposition temperature was also related to the characteristics of the crystalline structure, depending on a critical substitution value. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 2624–2632, 2001 相似文献
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许多有机金属化合物具有抗病毒,抗癌功能,但是它们水溶性差,使人体对药物的吸收就受到影响,无法产生应有的药效.将糖基引入到有机金属化合物及其衍生物中.形成双药效基团,可以提高药物的溶解性,提高药物的吸收效率.文章以乳糖酸、氨基乙酸、二氯二茂钛为原料合成一种新的金属/糖组装物-乳糖酸二茂钛酯,并对其结构进行了表征. 相似文献
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Export of processed and frozen shrimp products is the backbone of seafood industries. But, shrimp processing industries give rise to a large amount of waste materials. These waste products generate serious pollution hazards. A wise method to minimize environmental threats from prawn processing waste is to convert them in to useful products. Shrimp shell waste can be economically converted to chitin, a mucopolysaccharide. This marine polysaccharide and its derivatives hold a major part in our lives as medicines, cosmetics, textiles, paper, food and other branches of industry because of their unique nature in properties such as low toxicity, biocompatibility, hydrophobicity, etc. Hydrolysis of chitin yields a value added product, Glucosamine. Carboxymethylchitin is another derivative of chitin, prepared by the carboxymethylation reaction. This review article is an attempt to give an idea about the preparation, properties, and applications of the derivatives of chitin viz., glucosamine and carboxymethylchitin. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献