Optimization and evaluation of reduced graphene oxide hydrogel composite as a demulsifier for heavy crude oil-in-water emulsion

The rising production of produced water from oilfields had been proven to bring detrimental environmental effects. In this study, an efficient, recyclable, and environmental-friendly reduced graphene oxide immobilized κ-Carrageenan hydrogel composite(κCa GO) was fabricated as an alternative sorbent for crude oil-in-water demulsification. Polyethyleneimine(PEI) was employed to form a stable hydrogel composite. The conditions for the immobilization of graphene oxide(GO) on PEI-modified κ-Carrageenan(κC) beads were optimized appropriately. An immobilization yield of 77% was attained at 2% PEI, 2 h immobilization activation time, and p H6.5. Moreover, the synthesized κCa GO is capable of demulsification with an average demulsification efficiency of 70%. It was found that the demulsification efficiency increases with salinity and κCa GO dosage, and it deteriorates under alkaline condition. These phenomena can be attributed to the interfacial interactions between κCa GO and the emulsion. Furthermore, the κCa GO can be recycled to use for up to six cycles without significant leaching and degradation. As such, the synthesized κCa GO could be further developed as a potential sorbent substitute for the separation of crude oil from produced water.     

Microstructural and tribological behavior of TiAlN/MoS2-Ti coatings

1. Introduction The search for a better wear resistant coating has resulted in the development of a class of hard, solid-lubricated coatings. The driving force behind the coating industry was the need to develop a proc-ess that will extend the life of steel machine parts, cutting tools, molding dies, and sliding parts. For example, in the stamping industry, severe abrasive wear and galling (cold metal welding) are expected. There is the need for an efficient application of lu-bricants both for…     

远东2500t/d生产线烧成系统的改造

我公司2号线2　500t/d生产线,预热器采用五级旋风筒,回转窑规格为Ф4.0m×60m,分解炉为高原型NDSP52在线式管道分解炉,规格为Φ5.2m×30m。该线于2007年8月投产,投产初期因为一些设计及设备的缺陷,烧成系统一直不稳定,熟料产质量低,窑实际产量约2 350t/d,熟料标准煤耗在120kg/t以上。2015年3月我公司对烧成系统进行了改造,提高了熟料的产质量并降低了能耗。     

磁控溅射MoS2-Ti复合膜的显微结构

过渡金属硫化物MoS2为层状结构，层内为强的化学键，层间为极弱的范德华力。MoS2因其分子间这种特殊的层状结构而具有良好的自润滑性能，因此常用作固体润滑剂。MoS2涂层可以大大降低工件表面的摩擦和摩损，提高工件的使用效率，延长工件的使用寿命。但纯MoS2难以在空气中长期使用，特别是在潮湿的空气下，MoS2极易发生氧化变质，从而降低MoS2润滑剂的使用寿命。磁控溅射具有成膜速率高、沉积温度低、膜层厚度均匀和膜层组织致密等优点，已广泛用于各种耐磨、耐蚀和抗氧化镀层的制备。     

脱硫石膏代替天然石膏在水泥生产中的应用

<正>天然石膏是目前水泥行业使用最广泛的缓凝剂原材料,但由于天然石膏为不可再生资源,随着我国水泥工业的不断发展、水泥产量的不断增加,优质的天然石膏资源日益匮乏,价格也是逐年升高。我公司也同样遇到了天然石膏的资源问题以及价格成本     

低碳微钛钢中TiN沉淀相的稳定性

从热力学关系和用TEM分析了TiN沉淀相在热处理过程中的稳定性。结果表明 ,TiN沉淀相的稳定性与颗粒的尺寸有关 ,小颗粒的TiN稳定性差易溶解 ,大颗粒的TiN则稳定性好而进一步长大。热处理过程中TiN沉淀相的长大关系满足Kreye关系。     

600 MW机组冷却塔优化改造后热力性能分析

冷却塔作为火电厂热力循环中最主要的冷端设备之一,与电厂经济运行有着密切的关系,但其节能问题往往被忽视。以某600 MW机组双曲线逆流式自然通风冷却塔为研究对象,对冷却塔的淋水填料和喷溅装置优化改造后进行了热力性能试验,并对其冷却能力进行计算,同时,将改造后的淋水填料特性和喷头优化性能进行分析,指出冷却塔冷却能力得到提升的原因,为电厂在今后的冷却塔运行优化和节能改造提供了依据。     

MoS2／Ti复合膜的制备和性能

为了克服MoS2薄膜在大气环境下极易氧化失效且耐磨性能差的缺点，采用非平衡直流磁控溅射技术制备了MoS2／Ti复合膜，研究了Ti靶电流对复合膜结构和性能的影响。电子探针（EPMA）测定表明，膜中Ti的含量随着Ti靶电流的增加而增加。场发射扫描电子显微镜（FE．SEM）对膜的表面和截面形貌观察发现，膜的表面由尺寸为几十～几百纳米的颗粒组成，而膜的截面呈柱状晶结构。膜的致密性和Ti靶电流有关，电流越高，膜的致密性越好，从而膜的硬度也越高。