离子膜电解运行小结

我厂1万t/a离子膜烧碱装置系引进日本旭化成公司的复极槽技术,并于1993年10月正式投入运行。开车至今,共使用过2批离子膜,全部由日本旭化成公司提供。使用的第1批离子膜型号为F-4111,共使用了三年零八个月。到1997年5月下旬,我们把F-4111离子膜全部换下,换上型号为F-4112离子膜。此批膜至今仍在使用,现把2批膜的     

我厂离子膜使用情况

1 概况我厂离子膜法制烧碱装置自1986年6月建成投产至今,正常运行将近10年。离子交换膜先后共使用了5批,其中日本旭化成公司的3批,牌号分别是FB—194、FB—271和FB4111膜;美国杜邦公司的两批,牌号是NE—966和NE—966TX膜。前4批离子交换膜使用寿命均在两年左右。NE—966TX     

8万t/a离子膜烧碱电解槽运行状况总结

锦化化工(集团)有限责任公司引进日本旭硝子公司的生产技术和相关设备,生产规模为8万t/a;离子膜电解槽槽型为AZEC-F2(6,7),共52台,膜型号F-893全氟磺酸羧酸复合膜.介绍了电解槽的主要结构、组装方式、特点、运行指标及运行中出现的异常现象.     

F—4112膜在我厂运行情况总结

F- 41 1 2膜是我厂 期离子膜装置所采用的膜。自 1 999年 6月 1 7日通电运行至 2 0 0 1年 6月1 8日停运整整运行 2 4个月。为了使 期膜使用寿命延长 ,发挥出更好的经济效益。总结过去 ,着眼未来显得十分必要。现将 F- 41 1 2膜在我厂的运行情况作一介绍 ,以便同行参考。1　两     

离子膜电解槽膜极距改造后运行情况总结

在离子膜电解槽进行膜极距改造的同时,分别使用了F-8080膜和另一公司的离子膜。对比改造后不同电解槽使用不同膜的电压曲线和氯气纯度,说明使用不同膜的氯气纯度和电流效率都相差不多,但是F-8080膜在电压上有较大的优势,节电效果明显。     

旭化成公司两种离子交换膜性能比较

齐化集团有限公司采用日本旭化成复极强制循环槽工艺生产烧碱。Ⅱ期、Ⅲ期开车时均使用旭化成公司Apciple-F-4112(简称F-4112)离子膜,已使用了13年,效果较好。2002年Ⅰ期离子膜装置复产开车时继续采用旭化成公司新电解糟及F-4112型新膜,但在运行37天停车做膜试漏时发现膜泄漏,之后每次停车都发生膜漏。采取多种技术措施,效果都不太理想。日方因此做出了赔偿,并推荐了新产品Apciple-F-4602(简称F-4602)膜。2004年4月,齐化集团有限公司Ⅱ期更换新槽时,采用了F-4602型号膜,现已运行17个月。两种膜的操作条件为:二次盐水Ca2 ≤0.02 mg/L;pH…     

单极离子膜分析报告

1　概况天津化工厂电解分厂单极离子膜车间于1994年11月开工,现正使用第2批离子交换膜(日本旭硝子公司Ｆ-893型)。因第2批膜使用情况不理想,我厂多次与日方交涉,日方几次来人查看,但由于各种一手材料(尤其是旧膜分析数据)全部由日方提供,需我厂自己掌握各数据和材料。我厂技术中心与电解分厂联合,1999年6月22日派人去北京化工大学,带1张旧膜(338#槽下,使用45个月)进行电镜分析,做膜两侧表面元素测定。2　分析结果北京化工大学电镜室设备为扫描电镜(250ＭＫ3型),可分析大部分元素,误差10%以下,但有几处限制:只能分析出Ｎａ以后(包括Ｎａ)的元…     

F-4112膜的运行总结

1 F-4112膜的运行情况 F-4112膜是我厂Ⅰ期离子膜装置所采用的膜。自1999年6月17日通电运行至2001年6月18日停运,运行了24个月。运行情况如表1所示。 由表1可见,2年来装置的生产能力基本达到设计能力。但在实际生产中,膜在半年时间内相继出现诸多问题     

烧碱离子膜NX2030膜运行情况总结

介绍了杜邦NX2030离子膜运行情况,分析了影响膜长周期运行的因素。结合膜运行六年多的概况,总结了生产运行中管理和操作要点,为进一步维护运行好离子膜提供了参考。     

离子膜电解槽操作条件探讨

1 前言 我厂自1986年6月10日离子膜法制碱生产装置建成投产,至今已正常运行10多年。离子膜先后共使用了5批,其中日本旭化成公司的3批,其牌号分别是FB—194、FB—271和FB—4111膜;美国杜邦公司的2批,牌号是NE—966和NE—966TX膜。通过生产实践,笔者就操作方面的有关条件与离子膜性能的关系,谈点粗浅的认识,旨在与同行进行相互交流和学习。     

Flemion-893离子交换膜的再生探讨

介绍了运行４１个月后工艺性能下降的Ｆ－８９３膜的再生方法及再生的使用情况。     

Studies on the interaction of DNA and water‐soluble polymeric Schiff base–nickel complexes

The modes and activities of the interaction of DNA and water‐soluble polymeric Schiff base–nickel complexes, which have been prepared by polymeric analogous reaction, have been discussed according to absorption spectra, circular dichroism spectra, and fluorescent probe method. It is indicated that polymeric matrix effect and increasing solubility in water can increase the interaction of these water‐soluble polymeric metal complexes with DNA. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 887–893, 2002; DOI 10.1002/app.10000     

SEBS对iPP/NX8000K组合物透明性能和力学性能的影响

为了增强等规聚丙烯（iPP）的透明性能和冲击性能，采用物理共混方法，将弹性体氢化聚苯乙烯—丁二烯—聚苯乙烯嵌段共聚物（SEBS）与NX8000K成核剂配合使用对iPP进行改性。通过差示扫描量热分析（DSC）和X射线衍射分析（XRD）、偏光显微镜分析（POM）等方法研究了SEBS对iPP/NX8000K组合物的结晶行为、透明性能和力学性能的影响。结果表明：在NX8000K含量为0.6 %（质量分数，下同），SEBS用量为40 %时，iPP/NX8000K/SEBS三元组合物的雾度降至24.9 %，比纯iPP降低了54.7 %；冲击强度增至50.7 kJ/m2，与纯iPP相比提高了10倍。     

Studies on adsorptive desulfurization by zirconia based adsorbents

This study reports usage of laboratory prepared zirconia samples (normal dried zirconia (ZD383), zirconia calcined at 893 K (ZC893), zirconia sulfated and calcined at 893 K (SZC893)) as adsorbents for the removal of sulfur from model oil (dibenzothiophene, DBT in iso-octane). Bulk densities of adsorbents were found to be in the range of 0.896–0.987 kg/m³. Optimum adsorbent dose was found to be 10 g/l. The adsorption of DBT on zirconia based adsorbents was found to be gradual process with quasi-equilibrium condition reached in 22 h. Brunauer–Emmett–Teller (BET) isotherm best represented the equilibrium adsorption data. The heat of adsorption and change in entropy for DBT adsorption onto zirconia based adsorbents were found to be −165.3 (ZD383), −125.5 (ZC893), −96.7 (SZC893) kJ/mol, and −509.9 (ZD383), −379.4 (ZC893), −284.1 (SZC893) J/mol K, respectively.     

新型纳米平板陶瓷膜在纸箱生产废水回用中的工程应用

采用混凝沉淀+水解酸化+MBR+活性炭吸附组合工艺来回用纸箱厂废水。MBR膜采用的是新型纳米平板陶瓷膜。介绍了各处理段的工艺特点、构筑物的设计尺寸、设备选型等,并对新型纳米平板陶瓷膜的清洗进行了介绍。系统运行一年,出水水质稳定,优于≤城市污水再生利用城市杂用水水质≥GB/T 18920-2002表1中的城市绿化排放标准,即BOD5≤20 g/L,浊度≤10 NTU,色度≤30,并分析了本工程的处理成本及所产生的经济效益。     

非离子表面活性剂TX114的浊点分相行为

Distribution of TX114 between coacervate and aqueous phases in clouding of various initial TX114 concentrations was studied. Effects of temperature and salinity （Na2SO4） on the distribution of TX114 concentration were also investigated. Differing from the nonionic surfactant C12E10, the distribution of TX114 is sensitive to the temperature, and it is observed that the TX114 concentration in the aqueous phase （Caq） does not depend on the initial TX114 concentration apparently at 45℃, and the Caq decreases with an increase of NazSO4 concentration. Low initial TX114 concentration in unclouded solutions, high Na2SO4 concentration, and temperature are suggested to control the surfactant loss in large-scale cloud point extraction applications.     

Interfacial properties of chitosan and nonylphenol polyoxyethylene ether

Nonylphenols are water‐soluble surfactants that are used extensively in industry and are found in many consumer products. Nonylphenol polyoxyethylene ether (known commercially as TX‐100), which is one of the most popular members of this family, has a detrimental effect on the environment. Adding chitosan to a solution of TX‐100 reduces the amount of surfactant required while maintaining its surface activity. We evaluated the interfacial properties, including the surface tension, contact angle, and particle size, as well as the fluorescence and Fourier transform infrared spectra of various test solutions prepared from three stock solutions: (1) chitosan dissolved in dilute acetic acid, (2) TX‐100 dissolved in deionized water, and (3) a mixed chitosan/TX‐100 solution. Previous results revealed that low concentrations of TX‐100 are relatively harmless to the environment; in this study, we found that its surface activity at a higher concentration was equal to that of its chemical mixture with chitosan. In addition, we found that the presence of chitosan improved the stability of emulsions of TX‐100. The micellar particles were small, and the stability of the emulsion was maximized at a TX‐100 to chitosan ratio of 7 : 3. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

TXl型高效吸油剂在气体净化中的工业应用

介绍了TX1型高效吸油剂在脱硫剂中的埋包实验情况,并与工业焦炭和催化剂载体(氧化铝球)的吸油效果进行了比较。结果表明,TX1型高效吸油剂具有吸油率高、强度高、孔隙率大、价格适中、吸油不吸硫等优点。在全低变流程的过滤器中装入TX1型高效吸油剂,过滤后的气体含油量几乎为零,使变换炉的阻力不因机械杂质和油污而上升。     

基于Nx6.0和VERICUT的数控加工仿真应用

数控仿真是数控加工模拟虚拟环境中的反映,能为产品的可制造性分析提供关键数据。在对手机电极实际零件数控加工的基础上,介绍了以NX6.0和VERICUT软件相结合作为仿真平台。实现加工刀位轨迹仿真和机床仿真同步实现。结合手机电极的加工实例实现了数控加工仿真的全过程。为复杂曲面零件的生产提供了有力依据。     

Electrospinning of chitosan/poly(lactic acid) nanofibers: The favorable effect of nonionic surfactant

To improve the electrospinnability of chitosan (CS), a series of nanofiber membrane blends comprised of CS, poly(lactic acid) (PLA), and nonionic surfactant polyoxyethylene nonylphenol ether (TX‐15), were made. Uniform nanofibers with no bead‐like structures were obtained from solutions of 2% TX‐15 with 6% CS(50)/PLA(50). The diameter was between 200 and 300 nm. We found that with increasing TX‐15 in the blend, the nanofibers displayed more hydrophilicity. Compared to CS/PLA nanofibers, the blend polymers with TX‐15 had better tensile mechanical properties. Finally, all cells examined showed high levels of attachment and spreading on CS/PLA/TX‐15 nanofibers with a TX‐15 content of 0～3%. Thus, the nanofibers were nontoxic. In conclusion, adding PLA and TX‐15 to CS via solution‐blending and electrospinning may be an effective way to toughen CS nanofibers and make them more suitable for drug delivery or tissue engineering applications. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 41098.