预碳化辅助双氧水沉淀高碱铝酸钠溶液强化薄水铝石合成工艺(英文)

Hydrogen peroxide (H2O2) precipitation from sodium aluminate (SA) solution at close-ambient temperature is an efficient method to synthesize boehmite and its derived alumina with high surface area, but the precipitation yield of Al2O3 is usually below 50% in highly alkaline SA solutions. Here the synthesis of boehmite is enhanced through a precarbonization-assisted H2O2 route in highly alkaline SA solutions. It is found that the crystal structure of the precipitation product is evidently influenced by the precipitation conditions. As the precipitation temperature increases from 273 to 325 K, a small amount of gibbsite by-product is formed. As the aging temperature increases from 301 to 333 K, the crystallinity of boehmite decreases and part of the boehmite dissolves due to an increase in the pH value. Based on the above results, a precarbonization-assisted H2O2 route is proposed to obtain pure boehmite with more complete recovery of Al2O3 from highly alkaline SA solutions. The route includes a controllable precarbonization step of SA solutions with a molar ratio of Na2O to Al2O3 higher than 2︰1, followed by the H2O2-precipitated step with a molar ratio of H2O2 to Al2O3 less than 7︰1. Because of its facile operation conditions, no extraneous impurity, time saving and a possible recycle of the filtrate, the route has great potential to be an alternative method for preparation of boehmite and its derived alumina.     

三聚氰胺熔喷/芳砜纶耐高温复合滤料的复合工艺及性能研究

分别使用针刺和预针刺+水刺两种工艺,将三聚氰胺熔喷材料与芳纶/芳砜纶混合针刺布相复合,制成耐高温复合滤料,用于高温气体过滤。对两种工艺制备的复合滤料进行基本物理及力学性能、透气性能、孔径及过滤性能测试与对比。结果表明：针刺工艺对纤维损伤较大,纤维断裂明显,部分熔喷纤维被刺断并被带出复合滤料,而预针刺+水刺工艺对熔喷纤维损伤相对较小,纤维断裂少;针刺工艺制备的复合滤料孔径偏大,而预针刺+水刺工艺制备的复合滤料孔径偏小;两种工艺制得的复合滤料的过滤效率均能达到99.998 0%以上,其中预针刺+水刺工艺制备的复合滤料的过滤效率略高于针刺工艺制备的复合滤料,且两者人工老化后的过滤效率仍可达99.996 0%以上,都可作为新型滤料用于实际生产中。     

动态二维码在多联机空调系统中的应用

二维码在不同领域的应用给人们带来了越来越多的便利,越来越多的商品开始在包装、说明书或本体上印刷二维码,用户扫描二维码后可以获取对应的信息,对于多联机空调系统,基于其特点,可以在线控器上动态生成和显示不同场景的二维码,本文将全面阐述动态二维码在多联机空调系统中的应用,包括二维码如何与多联机系统有机结合,如何在多联机系统中实现动态二维码的生成和显示,以及多联机动态二维码能给用户带来哪些增值功能和服务。     

基于电力线载波通信的空调控制系统设计与实现

本文以宽带电力线载波通讯技术为基础,结合该通信技术的关键特性,以多联机空调为例,设计与实现多联机空调工程调试与机组运行控制系统.工程调试阶段,将外机、内机或线控器等设备节点手动或自动切换为中央协调器角色,并由中央协调器发起通讯网络组建、地址分配、节点权限管理等功能;机组运行时,通过建立数据映射表和通讯信标,实现在状态数据实时更新的同时,减少冗余数据,降低功耗、提高控制实时性.测试结果表明该控制系统设计,在保持组网控制灵活性的同时,具备高效的通讯数据收发效率,具有很高的产品应用价值和市场发展前景.     

低温离子浓缩交换Ag/Cu-ZSM-5分子筛催化剂的制备及其脱硝性能的评价

结合固相分散法和液相浸渍法的优点,提出一种耗时短、负载量高、分散性和稳定性好的低温离子浓缩交换法,并将其用于Ag/Cu-ZSM-5分子筛催化剂的制备,即在超声波作用下进行低温离子浓缩交换,然后采用微波马弗炉焙烧,使Ag、Cu离子在分子筛的铝羟基和桥联羟基上进行离子交换,并可使更多的离子交换到活性更高的铝羟基上,从而提升了催化剂的脱硝活性和反应空速.通过对催化剂的表征以及脱硝活性的评价,表明:当硅铝比为38、硝酸银和分子筛质量比为0.453、Ag和Cu摩尔量比值为1时,Ag/Cu-ZSM-5催化剂处理NO的效果最佳.在空速为4000～4500 h-1、NO体积含量为2000 ppm(平衡气为N2)、O2体积分数为5％、温度为310～440℃的反应条件下,NO的分解率均在45％以上,在反应温度为390℃时,NO的分解率为78.1％.     

四氢呋喃的精制

对从５０年代以来的关于四氢呋喃的纯化、精制的方法（其中包括一些在实验室中所用的方法）作了简要地回顾，并按化工单元操作把它们分成五大类：（１）一般化学方法；（２）吸附法；（３）膜分离法；（４）萃取精镏法；（５）恒沸精镏法．最后对这五类不同的方法作了分析和展望．     

蜂窝陶瓷填料型催化剂的制备及其脱硝性能评价

本文研制出一种填料型催化剂,通过催化填料吸收塔实现了对模拟船舶内燃机尾气中NO的络合吸收和络合液的耦合再生,提高了络合脱硝的效率及络合液催化再生的能力.通过对填料型催化剂制备工艺研究显示,催化剂中钯含量为1.20％,操作温度为40℃时,整体脱硝效果最好.其脱硝性能评价表明,在模拟烟气的气流量为150 L/h,NO的含量为700 ppm,O2的含量为10％,催化剂用量为150 g,填料装填高度为30 cm,络合液初始浓度为0.05 mol/L以及pH值为6的条件下,在脱硝率达80％以上,催化剂可以连续运行120 min.     

邻氯氯苄合成中氯化工序的技术改进

介绍了邻氯氯苄合成中,采用塔式光氯化反应器替代釜式氯化反应器技术。该技术改善了反应条件,氯气利用率、邻氯甲苯转化率等明显提高,降低了消耗,解决了环境污染问题。     

非均相催化一步合成碳酸二苯酯的研究（VI）Sn 的添加量对Pd-Sn催化性能的影响

The compound metal oxide LaxPbyMnzO used as support was prepared by the sol-gel method, and the catalyst in which Pd was used as active component and Sn as co-active component for direct synthesis of diphenyl carbonate (DPC) with heterogeneous catalytic reaction was obtained by co-calcination and precipitation respectively.The catalyst was characterized by XRD, SEM and TEM respectively. The specific surface area of catalysts was measured by ChemBET3000 instrument, and the activity of the catalysts was tested by the synthesis of DPC in a pressured reactor. The results showed that when the co-active component Sn was added by co-calcination method A, its loading content was equal to 14.43% and active component Pd was loaded by precipitation, the yield and selectivity of DPC could reach 26.78% and 99% respectively.     

四氢呋喃—水恒沸物萃取精馏的模拟计算

用Wang和Henke泡点法对宽沸点体系的萃取精馏进行了模拟计算，结果表明：在塔板数为12块、泡点进料并满足塔顶产品含量大于99.5%的情况下，进料位置为第8块、溶剂比为1、回流比为1.5塔顶产品的采出量为0.5mol/s时，该萃取精馏的状况较好，此外，还就Wang和Henke泡点法对宽沸点体系的萃取精馏模拟计算的收敛性进行了探讨。