氟化铝生产工艺综述及实际应用案例

随着全球工业化水平的提高,优良的氟化铝生产工艺及其产品才能提高市场竞争力。主要综述了不同氟化铝生产工艺的区别,结合实际生产案例对比分析,介绍了公司无水氟化铝工艺的特点。     

电解铝工业辅料—氟化铝

氟化铝是铝电解工业中不可或缺的辅料之一,铝用氟化盐的发展趋势是氟化铝。尤其是干法氟化铝产品在理化性能方面具有明显的优越性,既可以减少氟化铝的用量,又可以减少对环境的污染,是电解铝生产中一种理想的辅助原材料。分析阐述了国内外氟化铝产品的生产工艺,并对氟化铝近期及未来的市场情况做了分析和展望,最后对中国氟化铝行业的健康发展提出了建议,希望对该领域的技术进步有所启迪。     

我国氟化铝生产技术现状及发展趋势

介绍了氟化铝市场、生产状况的现状和氟化铝生产技术的发展状况,详细分析了目前各种生产工艺的优缺点,指出"精酸法"及其配套废水综合利用的干法工艺是氟化铝生产工艺的发展趋势。     

我国氟化铝生产技术进步及市场前景

介绍了我国氟化铝工业生产的历程、生产工艺及技术改进情况，指出我国氟化铝技术发展方向，并对氟化铝产品市场前景作了展望。     

氟硅酸法生产氟化铝的工艺技术比较及发展现状

介绍了以氟硅酸为原料生产氟化铝工艺技术的国内现状,分析比较了国内正在运行的法国AP法生产工艺、美国铝业ALCOA生产工艺和诺顿机械设备有限公司生产工艺等3种氟化铝生产装置的工艺技术特点,指出了磷肥行业副产氟硅酸的综合利用将成为未来氟化工发展的方向。     

浅谈瓮福磷肥厂氟化铝装置的干燥脱水工艺

对公司福磷肥厂氟化铝装置中美国雷森公司ＡＬＣＯＡ锻炼工艺进行了剖析和探讨，同时简介了目前国内引进的几种氟化铝生产煅烧工艺。     

乙二胺合成工艺及催化剂的研究进展

叙述了国内外乙二胺的市场应用情况,介绍了国内外乙二胺的几种合成工艺方法及合成乙二胺所用催化剂的研究进展,比较了各工艺路线的优缺点。结合我国的实际,提出了乙二胺合成工艺及其催化剂的研究方向,为乙二胺的生产工艺开发提供参考。     

我国氟化铝生产技术进步及市场前景

介绍了我国氟化铝工业生产的历程,生产工艺及技术改进情况,指出了我国氟化铝技术发展方向,并对氟化铝产品市场前景作了前瞻。     

电解铝工业专用助剂氟化铝生产新工艺

分析了国内氟化铝市场及生产情况,指出氟化铝生产技术落后,市场供不应求。湿法制盐工艺高温下HF与Al(OH)3反应,合成的AlF3·3H2O经两步或三步煅烧脱水得无水AlF3,原料氢氟酸损失大,产品质量差,环境污染严重。在小试和中试的基础上,研究开发出了“低温合成,一步煅烧”氟化铝新工艺,较好地解决现行工艺中存在的问题,提高了产品的竞争力。     

丙烷脱氢(PDH)工艺技术及经济性分析

中国目前丙烯生产量约占全球总产量的一半以上,已经发展成为全球专用丙烯的主产地之一,并且中国丙烯产量现仍以每年7%以上的平均速度继续快速增长。在丙烯生产工艺中,丙烷脱氢工艺凭借其低廉的生产成本、丰富的原料资源和成熟的工艺技术等诸多优势,目前已经发展成为最具市场竞争力的专用丙烯生产工艺。本文从工艺特点、技术优势、经济性等方面针对几种不同的丙烷脱氢制丙烯工艺进行了分析对比,并结合分析结论和市场情况提出了投资建议。     

Atrial Fibrillation: Pathogenesis,Predisposing Factors,and Genetics

Atrial fibrillation (AF) is the most frequent arrhythmia managed in clinical practice, and it is linked to an increased risk of death, stroke, and peripheral embolism. The Global Burden of Disease shows that the estimated prevalence of AF is up to 33.5 million patients. So far, successful therapeutic techniques have been implemented, with a high health-care cost burden. As a result, identifying modifiable risk factors for AF and suitable preventive measures may play a significant role in enhancing community health and lowering health-care system expenditures. Several mechanisms, including electrical and structural remodeling of atrial tissue, have been proposed to contribute to the development of AF. This review article discusses the predisposing factors in AF including the different pathogenic mechanisms, sedentary lifestyle, and dietary habits, as well as the potential genetic burden.     

Enhanced interfacial adhesion of aramid fiber reinforced rubber composites through bio-inspired surface modification and aramid nanofiber coating

In order to improve the interfacial adhesion between aramid fiber (AF) and rubber matrix, a simple and facile method of aramid nanofiber (ANF) coating is demonstrated in this article. Tannic acid (TA) and polyethyleneimine (PEI) are polymerized in an alkaline solution to form a thin TA/PEI (TP) layer that is deposited on the surface of AF to introduce functional groups such as hydroxyl and amino groups. Then, the ANF coating is utilized to construct nanostructures on the surface of AF to improve the interfacial adhesion between the fiber and the rubber. Through hydrogen bonding and/or π-π stacking between the TP layer and the ANF, the ANF coating is firmly attached to the surface of AF. Compared with the untreated fiber, the interfacial adhesion of AF coated with ANF after 1, 3, 5, 7, 9 deposition cycles is increased by 27.8%, 29.1%, 31.5%, 43.1%, and 30.3%, and the mechanical properties of the fibers remain almost unchanged. This method shows its advantages of simple, facile, and time-effective, which is of great significance for industrial applications.     

含氟环氧树脂的合成

用２，２－二（４－羟基苯）－１，１，１，３，３，３，－六氟代丙烷（双酚ＡＦ）与环氧氯丙烷进行缩合聚合，然后分别测定其有关物性，结果表明，由于氟原子的引入，使得聚合物的溶解性上升，耐热性提高。     

双酚AF改性水性聚氨酯的合成与性能研究

通过丙酮法以聚碳酸酯二元醇(PCDL)、异佛尔酮二异氰酸酯(IPDI)为原料,双酚AF为改性剂,2,2-二羟甲基丙酸(DMPA)、1,4-丁二醇(BDO)为扩链剂,三乙胺为中和成盐剂合成了一系列不同双酚AF含量改性的水性聚氨酯(WPU)乳液。通过傅立叶红外光谱(FTIR)、X射线衍射(XRD)、热重分析(TGA)、力学性能、表面水接触角、吸水率测试等对聚合物结构与性能进行了表征。结果表明,随着双酚AF含量的增加,WPU薄膜的表面水接触角增大,吸水率降低,耐水性能有所提高;薄膜拉伸强度与断裂伸长率先增大后降低。热重分析结果表明,WPU薄膜的热分解温度随着双酚AF添加量的增加先增大后降低,仍保持良好的耐热性能。XRD分析结果表明,改性前后的水性聚氨酯薄膜均为非晶型,双酚AF的加入对结晶性能并无影响。     

The Role of Mitochondrial Dysfunction in Atrial Fibrillation: Translation to Druggable Target and Biomarker Discovery

Atrial fibrillation (AF) is the most prevalent and progressive cardiac arrhythmia worldwide and is associated with serious complications such as heart failure and ischemic stroke. Current treatment modalities attenuate AF symptoms and are only moderately effective in halting the arrhythmia. Therefore, there is an urgent need to dissect molecular mechanisms that drive AF. As AF is characterized by a rapid atrial activation rate, which requires a high energy metabolism, a role of mitochondrial dysfunction in AF pathophysiology is plausible. It is well known that mitochondria play a central role in cardiomyocyte function, as they produce energy to support the mechanical and electrical function of the heart. Details on the molecular mechanisms underlying mitochondrial dysfunction are increasingly being uncovered as a contributing factor in the loss of cardiomyocyte function and AF. Considering the high prevalence of AF, investigating the role of mitochondrial impairment in AF may guide the path towards new therapeutic and diagnostic targets. In this review, the latest evidence on the role of mitochondria dysfunction in AF is presented. We highlight the key modulators of mitochondrial dysfunction that drive AF and discuss whether they represent potential targets for therapeutic interventions and diagnostics in clinical AF.     

Aramid fiber reinforced EPDM microcellular foams: Influence of the aramid fiber content on rheological behavior,mechanical properties,thermal properties,and cellular structure

In this paper, aramid fiber (AF)/ethylene-propylene-diene monomer (EPDM) microcellular foams added with different content of AF are prepared by the supercritical foaming method. The effect of the AF content on the rheological behavior, mechanical properties, thermal properties and cellular structure of the AF/EPDM microcellular foams has been systematically studied. The research illustrates that compared with pure EPDM, the AF/EPDM matrix has greater viscosity and modulus, which is conducive to reduce the cell size and increase its density. And the thermal stability of EPDM foams is improved with the addition of aramid fiber. Meanwhile, when the content of AF is added to 1 wt%, the AF/EPDM microcellular foam exhibits a relatively low thermal diffusion coefficient and apparent density with the thermal conductivity to 0.06 W/mK. When the AF is added to 5 wt%, the tensile strength of the AF/EPDM microcellular foam increases to 1.95 MPa, which is improved by 47% compared with that of the pure EPDM foam. Furthermore, when the compressive strain reaches to 50%, the compressive strength of the AF/EPDM microcellular foam is 0.48 MPa, improved by 296% compared with that of the pure EPDM foam.     

培养基组成成分对加利利链霉菌AF1发酵过程影响的初步探索

探索影响加利利链霉菌AF1发酵过程的培养基组成成分。碳、氮源试验结果表明菌株AF1能够较好的利用可溶性淀粉和胰蛋白胨。在基础培养基和培养条件不变的前提下,改变可溶性淀粉质量浓度,在质量浓度为3.5%时,菌株AF1的代谢产物对金黄色葡萄球菌的抑菌活性最高,达到15.5 mm。在基础培养基和培养条件不变的前提下,改变胰蛋白的质量浓度,当浓度达到0.25%时,抑菌活性最高,达到13.4 mm。供试的8种氨基酸试验结果表明Arg、Gln和Lys具有明显促进菌体生长的作用,Asn、Phe的促进作用不明显,而其他的氨基酸则表现出对菌体生长无显著效果;在产物合成方面,Arg、Asn、Phe、Tyr、Gln、Lys对产物合成具有较为明显的促进作用,但Met和Cys却表现出对产物合成有抑制作用。不同浓度的各种氨基酸试验结果表明,当基础培养基中Tyr浓度为0.13 mmol/L或者Lys 0.25 mmol/L时菌株生长和活性物质的代谢效果最为明显,100 mL的发酵液中菌体干重和发酵液抑菌活性分别达到0.19 g、14 mm和0.22 g、15.9 mm。     

高效减水剂的开发与生产

概述了高效减水剂的性能、发展历史、现状及市场，提出了煤焦油加工联合生产减水剂的技术方案，介绍了２０００ｔ／ａＡＦ型高效减水剂工程设计要点。     

Looking into a Conceptual Framework of ROS–miRNA–Atrial Fibrillation

Atrial fibrillation (AF) has been recognized as a major cause of cardiovascular-related morbidity and mortality. MicroRNAs (miRNAs) represent recent additions to the collection of biomolecules involved in arrhythmogenesis. Reactive oxygen species (ROS) have been independently linked to both AF and miRNA regulation. However, no attempts have been made to investigate the possibility of a framework composed of ROS–miRNA–AF that is related to arrhythmia development. Therefore, this review was designed as an attempt to offer a new approach to understanding AF pathogenesis. The aim of this review was to find and to summarize possible connections that exist among AF, miRNAs and ROS to understand the interactions among the molecular entities underlying arrhythmia development in the hopes of finding unappreciated mechanisms of AF. These findings may lead us to innovative therapies for AF, which can be a life-threatening heart condition. A systemic literature review indicated that miRNAs associated with AF might be regulated by ROS, suggesting the possibility that miRNAs translate cellular stressors, such as ROS, into AF pathogenesis. Further studies with a more appropriate experimental design to either prove or disprove the existence of an ROS–miRNA–AF framework are strongly encouraged.