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CA/CAT共混不对称纳滤膜分离特性的研究 总被引:8,自引:3,他引:5
制备了CA/CAT共混物不对称纳滤膜,膜对单价与多价阴离子能实现有效分离,并能去除小分子有机物。在1MPa操作压力下,料液温度为15-25℃,膜对1000mg/L的NaCl水溶液的截留率为15%-60%,而1000mg/L的Na2SO4水溶液截留率为85%-98%, 相似文献
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纳滤膜及其表面活性剂分离特性的研究 总被引:15,自引:1,他引:14
制备了不同规格的CA-CTA混合纤维素纳滤膜,在1.0MPa下,对1000mg/LNaCl截留率达50%~80%,透水率20~60L/m2·h.对100mg/LMgSO4截留率达90%~98%,透水率20~60L/m2·h.对1000mg/L葡萄糖截留率达90%~95%,透水率20~60L/m2·h.并用该膜对十二烷基苯磺酸钠的分离特性进行了初探.CA-CTA混合纤维素钠滤膜适用于阴离子表面活性剂的分离,其截留率达96%~98%,透水率20~40L/m2·h. 相似文献
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1 ABS塑料的表面金属化以化学法在塑料件表面上形成与基体有一定结合能力的金属层。步骤如下:(1)化学涂油 NaOH 40~50g/L;Na2CO3 15~20g/L;Na3PO4 15~20g/L;表面活性剂 3~5ml/L;温度 50~60℃;时间 15~20min。(2)化学粗化 CrO3 350~400g/L;H2SO4 380~400g/L;温度 50~60℃;时间 20~30min。(3)敏化、活化溶液 采用的胶体钯活化液,PaCl2 0.8~1.0g/L;SnCl2·2H2O 50… 相似文献
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润滑油酮苯脱蜡溶剂回收用聚酰亚胺纳滤膜分离性能的研究 总被引:1,自引:0,他引:1
主要研究了聚酰亚胺纳滤膜分离酮苯一润滑油的性能.考察了操作压力、温度、料液流量、料液中润滑油浓度及酮苯比等因素对膜通量和截留率的影响,并考察了长期运行情况下膜的分离性能.结果表明,随压力增大、温度升高和料液流量增大,膜通量也随之增大;料液中润滑油浓度的增加使膜通量减小,料液中酮苯比的增加可增大膜的通量;以上各种情况对膜的截留率影响不大,截留率稳定在95%以上;在40天的运行期内膜的分离性能变化不大,说明此聚酰亚胺膜具有较强的抗污染能力. 相似文献
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对共聚物电解质MA-Na2(顺丁烯二酸钠)/AA-Na(丙烯酸钠)水溶液ηsp/C(比浓粘度)与浓度的关系、中性盐及溶液pH对ηsp/C的影响进行了研究。结果表明,稀释MA-Na2/AA-Na溶液时,ηsp/C急剧上升,而稀释含中性盐(KCl或CaCl2)的MA-Na2/AA-Na溶液体系时(中性盐含量保持0.01mol/L),ηsp/C的变化却不大。添加极少量(〈0.05%)中性盐,可使MA-N 相似文献
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高通量聚丙烯腈超滤膜的研究 总被引:6,自引:0,他引:6
以聚丙烯腈(PAN)为原料,二甲基乙酰胺(DMAC)为溶剂,研究了铸膜液组成和若干因素对膜性能的影响。选择适当的膜液组成和制膜条件,可制得截留相对分子质量为15万(R=90%),透水量达150%~200mL(cm^2·h)的超滤膜。 相似文献
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Ahmad Aljaberi Ashish Chatterji Navnit H. Shah 《Drug development and industrial pharmacy》2013,39(9):1066-1071
Background: During the development of a tablet dosage form of an investigational compound, R411, several aspects were identified as critical quality attributes that required optimization. The use of nonsolvent processing prevented the moisture-induced physical changes in the drug product but presented manufacturing challenges related to sticking during compression and slowdown in dissolution after storage at stress conditions. Aim: The aim of this study was to evaluate silicified microcrystalline cellulose (SMCC), microcrystalline cellulose (MCC), and physical mixture of MCC–colloidal silicon dioxide (MCC/CSD at 98:2 ratio) as extragranular compression aids to address the processing and dissolution stability issues of this formulation. Methods: The compactibility and stickiness upon compression over extended period of time as well as the dissolution of R411 formulations incorporating the aforementioned compression aids were investigated. In addition, the water sorption/desorption properties of these compression aids were determined. Results: All formulations showed comparable compactibility irrespective of the compression aid used. Nevertheless, MCC alone or in a physical mixture with CSD showed sticking of the lower punches, whereas SMCC resulted in clean punch surface during extended compression runs. Furthermore, the three compression aids were compared for their effect on dissolution stability after storage at stress conditions. The formulations containing SMCC provided superior dissolution stability over the other compression aids evaluated in the study. Conclusions: Novel functionalities of SMCC are presented in terms of sticking prevention while having the most beneficial effect on dissolution stability in R411 formulation. 相似文献
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Steele DF Edge S Tobyn MJ Moreton RC Staniforth JN 《Drug development and industrial pharmacy》2003,29(4):475-487
The adsorption of a model amine drug (tacrine hydrochloride) from aqueous solution onto 21 microcrystalline cellulose (MCC) based samples has been investigated. The MCC source (manufacturer) affected adsorption. The adsorption appeared to be fully reversible. Adsorption was reduced by the use of high-density grade MCC, high-energy milling, and silicification. Adsorption of the model drug was not affected by the particle size of the MCC. Significant variations of the adsorption characteristics between batches of certain MCC products were found. The primary mode of adsorption was by ion exchange. 相似文献
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乙酸纤维素游离膜的吸湿性 总被引:3,自引:0,他引:3
研究了以乙酸纤维素为原料,丙酮为溶煤,用平面铸膜法制备的乙酸纤维素游离膜的吸湿性的特点.结果表明,游离膜的吸湿量和表观膜厚没有关系,仅与致密层厚度相关;增塑剂可增加膜的吸湿性,不同增塑剂对改善膜的吸湿性影响程度不同. 相似文献
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高取代度氰乙基纤维素与二醋酸纤维素共混中空纤维纳滤膜的研制 总被引:4,自引:0,他引:4
采用高取代度氰乙基纤维素与二醋酸纤维素共混为膜材料,丙酮、二氧六环混合溶剂,以有机醇为主、加入适量其他添加剂为致孔剂,通过冰水凝胶浴干湿法纺丝,制得性能良好的中空纤维纳滤膜,该膜在给水质量浓度1 800 mg/L、操作压力为0.6 MPa、水温25℃条件下,对二价盐CaCl2、一价盐NaCl的水溶液的脱盐率分别大于90%和小于60%,水通量均大于3.5 mL/(cm2.h).还讨论了膜液的组成和纺丝条件对膜性能的影响. 相似文献
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Henrik Bäckdahl Bo RisbergPaul Gatenholm 《Materials science & engineering. C, Materials for biological applications》2011,31(1):14-21
Nanocellulose (bacterial cellulose, BC), such as that produced by Acetobacter xylinum, has shown promising results as a replacement material for small diameter vascular grafts. The surface morphology of the lumen and mechanical properties of such tubes are crucial for their performance. The growth of a BC tube in a vertical fermentation bioreactor using silicone tubing for support and as an oxygen delivery membrane has not been studied in detail previously. Oxygen concentration and the number of bacteria added influence the production of the BC tubes. A dense and smooth luminal surface was formed after 4 days on a 3 mm silicone support. The bacteria were found to be in high concentration close to the silicon support and decreased in number further away. In the region with a high bacteria concentration, dense thin layers of BC were formed since the bacteria moved close together in this region. The presented observations were summarized in a theoretical model of BC tube growth. 相似文献