杂多酸固相催化合成麝香DDHI的研究

以杂多酸为催化剂 ,2 ,6 二异丙基酚 (DIPP)与异戊二烯 (IP)经环烷基化反应合成麝香DDHI。研究了催化剂种类和用量、原料配比、反应温度及时间对反应结果的影响。反应最佳条件为∶催化剂为磷钨酸固载于活性炭上 ,n(DIPP)∶n(IP) =2 .0 ,m(C1)∶m(IP) =0 .8～ 0 .9,反应温度 36℃～ 4 2℃ ,滴加时间 2h ,保温时间 1h ,产品收率 83.7%。     

复分解四步循环法制取硫酸钾新工艺

介绍了制取硫酸钾的一种新工艺－－复分解四步循环法，即氯化钾与硫酸铵反应生成硫酸钾铵与氯化铵钾，硫酸钾铵再与氯化钾溶液反应生成硫酸钾，氯化铵钾再与硫酸铵溶液反应生成氯化铵。整个工艺全封闭循环生产，产品硫酸钾K2O质量分数≥50％，钾收率达92％。     

3-氯-4-（2-溴甲基-4-甲基-1，3-二恶戍烷-2-基）苯基-4’-氯苯基醚的合成

3-氯-4-（2-溴甲基-4-甲基-1，3-二恶戍烷-2-基）苯基-4’-氯苯基醚是杀菌剂苯醚甲环唑的一个重要中间体。以2-氯-4-（4-氯苯氧基）-苯乙酮为起始原料，采用溴化和合环同时进行的合成工艺制得该化合物，收率90％．产品含量95％。优化了反应条件，简化了操作。     

Ni-ZrO2纳米复合电铸层抗高温氧化性能的研究

通过间歇式抗高温氧化实验,建立了纯镍电铸层和N i-ZrO2纳米复合电铸层高温氧化动力学模型,分析了电铸层表面和横截面的形貌,测定了电铸层的组织结构。结果表明,N i-ZrO2纳米复合电铸层抗高温氧化性能明显优于纯镍铸层,复合电铸层表面生成的氧化膜晶粒细小且致密,并且该氧化膜较薄,产生的内应力较小,与复合电铸层的黏附性较好。     

Mechanistic Insight in the Ethane Dehydrogenation Reaction over Cr/Al2O3 Catalysts

A Cr/Al₂O₃ alkane dehydrogenation catalyst exhibits a maximum in ethylene yield during an ethane dehydrogenation cycle. Isotopic labelling experiments with monolabelled ¹³C-ethane and deuterium were used to elucidate whether the initial activity increase could be due to formation of an active, larger hydrocarbon intermediate on the surface. The results strongly indicate that this is not the case, and instead point to a traditional reaction cycle involving adsorption of ethane to form an ethyl species, followed by desorption of ethene and hydrogen. Transient kinetic data suggest that ethane adsorption is the rate-determining step of reaction.     

PEN/PTT共混聚酯的熔融行为

利用差示扫描量热仪对不同配比的聚萘二甲酸乙二醇酯/聚对苯二甲酸丙二醇酯(PEN/PTT)共混体系的熔融行为进行了分析,发现在共混体系中两组分形成各自的晶体,PEN和PTT的熔点均随另一组分含量的增加而下降。根据Nishi-Wang方程,按300℃计算,由PEN/PTT共混体系中PEN熔点下降计算所得到的相互作用能密度为-0．214 2 J/cm~3,相互作用参数为-0．006 8,表明PEN/PTY共混体系在熔融态是热力学性质稳定的相容体系。     

Transformation of Crystal Phase of Micron-sized Rutile TiO2 and Investigation on its Sonocatalytic Activity

The partial transformation of crystal phase of micron-sized TiO₂ powder from rutile to anatase was realized utilizing microwave irradiation in hydrogen peroxide solution. Afterwards, the ultrasound of low power was used as an irradiation source to induce the transition crystal TiO₂ powder to perform the sonocatalytic activity through the degradation of azo fuchsine in aqueous solution. The results show that the sonocatalytic activity of the transition crystal TiO₂ powder is obviously higher than that of pure micron-sized rutile and anatase TiO₂ powders. The degradation ratio of azo fuchsine in the presence of the transition crystal TiO₂ powder attains nearly 80% within 80 min ultrasonic irradiation.     

Poly(N-vinyl-2-pyrrolidone) hydrogel production by ultraviolet radiation: new methodologies to accelerate crosslinking

Poly(N-vinyl-2-pyrrolidone) hydrogels produced by high-energy radiation relies on water radiolysis as a primary process leading to crosslinks. Conversely, ultraviolet direct irradiation into PVP leads to crosslinking trough pyrrolidinone moiety photolysis. However, this process showed to be rather inefficient. This work describes the crosslinking of poly(N-vinyl-2-pyrrolidone) based on hydrogen peroxide photolysis, therefore mimicking water radiolysis, using UV-C (e.g. low pressure Hg lamp) or UV-A radiation sources. The process efficiency and the properties of the hydrogel formed are discussed and compared with other methods of hydrogel production.     

纳米TiO2复合铁钛防锈颜料的研制及产业化进展

介绍了纳米TiO2复合铁钛防锈颜料的制备原理、工艺、技术指标;描述了铁钛防锈涂料的配方、性能检验和产业化进展情况.     

4-氟-2-氯苯胺的合成研究

介绍了以 4 氟苯胺为原料 ,通过乙酰化、氯代、水解三步制备 4 氟 2 氯苯胺的方法 ,对主要的影响因素作了考察并得出结论 :乙酰化反应温度应小于 30℃ ;氯代中 2 /SO2 Cl2为 1∶0 9(mol/mol)时较好 ;在水解阶段盐酸浓度控制在 4mol/L较佳 ,4 氟 2 氯苯胺的纯度大于 99% ,总收率达到 70 %