Purification of coal mine methane on carbon molecular sieve by vacuum pressure swing adsorption

The vacuum pressure swing adsorption (VPSA) method, as an alternative way to separate the CH₄/N₂ mixture, was adopted to purify methane from coal mine methane. The performance of the VPSA process was investigated experimentally and theoretically with a reactivated carbon molecule sieve as the adsorbent. The computer calculations were compared to the experimental data. The concentrated methane with 79% purity could be collected directly during the high-pressure adsorption step with 93% recovery and 0.0720 mL·g^–1·min^–1 productivity, when the composition of raw gas was 10/90 vol% CH₄/N₂, which is of great significance for the utility of low quality energy gas.     

A review on Zeolite-Reinforced Polymeric Membranes: Salient Features and Applications

Various types of synthetic polymeric membranes have been fabricated for separation purposes in industry/laboratory. Zeolite is ceramic-based material and well known for its antiwear resistance and high mechanical strength. Mixed matrix membranes are the latest membrane technology constituting inorganic nanoparticle phase and organic polymer phase. The review represents various types and applications of zeolite-reinforced polymeric membranes. Consequently, fabrication procedure and working principle of zeolite-reinforced mixed matrix (polyimide, polysulfone, polycarbonate) membranes have been discussed. The significant relevance of polymer/zeolite membranes is in water purification, medical, catalytic, and gas separation industries. Improvement in polymeric membrane properties has been observed through incorporation of zeolite filler.     

甘草酸提取纯化工艺的研究进展

简单介绍了甘草酸的药用历史和药理作用以及在国民经济中的应用。列举了甘草酸的提取方法,主要从提取溶剂和提取纯化手段两方面考虑。从提取溶剂方面考虑,主要有水提取法、稀氨水提取法、乙醇提取法、碱性乙醇提取法和复合酶法提取法;从提取纯化手段考虑,主要有微波辅助法、超声强化法、膜技术、多级逆流技术提取法、静电场协同超声提取法、间歇式泡沫分离、双水相萃取技术和大孔树脂法等。综述了以上提取方法,为进一步开发甘草资源提供参考。     

Separation of C6H6 and C6H12 from H2 using ionic liquid/PVDF composite membrane

Ionic liquid/polyvinylidene fluoride composite membrane was successfully prepared by impregnation method and used for the separation on organic chemical hydride process. The separation factors of C₆H₆/H₂ and C₆H₁₂/H₂ in the ternary mixture system were 7500 and 300, respectively. The ionic liquid membrane showed an excellent possibility as a technology of H₂ purification in the organic chemical hydride process by removing aromatic hydrocarbon and cycloalkane simultaneously from the ternary system. © 2015 American Institute of Chemical Engineers AIChE J, 62: 624–628, 2016     

湿法磷酸脱除金属离子的研究

对氨中和沉淀法脱除湿法磷酸中金属离子进行了实验室和中试研究。优化工艺条件为:氨与P_2O_5质量比15.08%~20.78%,反应温度88~95℃,反应时间0.5~1.0 h,净化磷酸澄清时间≥48 h。中试结果表明,所采用的流程是合理可行的,在一定程度上解决了磷矿品质下降和金属离子升高对磷酸生产及磷肥产品质量的影响。     

沼气低温净化工艺的模拟研究

依据气液相平衡理论,运用Aspen Plus软件,选用合适的单元操作模块,采用PENG-ROB物性计算方法,通过对沼气泡点、露点图的分析选择合适的模拟条件;在Aspen Plus软件上对沼气低温净化工艺进行模拟,并根据模拟数据分析压力、温度对低温净化工艺的效果的影响。     

高纯溶剂制备纯化及标准化研究

在科技部与质检总局资助下,开展色谱级、农残级、质谱级以及电子级等高纯溶剂制备纯化及标准化关键技术研究。在纯化关键技术方面,通过双塔精密精馏去除痕量同分异构体、同系物等杂质专利技术,从工业级直接制备得到农残级、质谱级高纯溶剂。在高纯试剂标准化方面,制订了《仪器分析用高纯水规格及试验方法》国家标准;建立了GB/T30301《高纯试剂试验方法通则》、GB/T 32263《高纯化合物农残级试剂的测定气相色谱-电子捕获检测器(ECD)法》等系列高纯试剂国家方法标准,以及HG/T 4747《农药残留检测用试剂正己烷》等高纯溶剂行业产品标准,填补了国内高纯试剂检测标准的空白。     

中间包优化对板坯连铸钢水洁净度的影响分析

根据已有的中间包,按照总容积不变,增加钢水进入区(V1)钢水容量的思路设计了4种中间包方案。应用水力学模拟的方式对包含已有中间包在内的5个中间包进行流场模拟,由于钢水进入区容量的增加,水口处的响应时间延长,平均停留时间增加,死区体积下降。综合比较,方案4为最佳中间包设计方案。浇注试验证明,V1体积的增加,可降低钢水耐材的冲击和侵蚀作用,有利于钢水中的夹杂物上浮。4试验方案夹杂物总数减少,大颗粒夹杂物数量显著降低,浇注结束后钢水纯净度有所提高,表现最优。     

三山岛金矿尾矿开发利用研究

从尾矿开发利用的角度,论述了三山岛金矿尾矿经提纯,改性后的非金属矿产品在塑料工业产品中的应用,结果表明;该非金属矿产品粒度细,表面活性好,在热注塑塑料产品中作填料,不仅能保持产品的各项性能不变,还降低了塑料产品的成本。     

汽车尾气净化催化剂研究发展现状

汽车尾气排放问题越来越受到各国重视,概述了汽车尾气净化催化原理、催化剂组成以及催化剂的研究生产现状,并指出当前存在的问题及尾气净化催化剂的发展趋势。