环戊烯氧化剂3戊二醛反应器的选型

根据小试和中试的实际情况，结合环戊烯氧化制戊二醛反应过程特点，确定首选带有搅拌的间歇釜式反应器，并就年产500吨戊二醛的工业规模进行了具体的反应器选型计算，可供实际生产设备选型参考。     

戊二醛合成方法述评

扼要介绍戊二醛合成方法的发展沿革 ,对吡啶法、吡喃法、戊二醇氧化脱氢法及环戊烯氧化法等几种戊二醇合成方法进行了评述。     

戊二醛杀生剂杀生性能实验室评定和现场应用报告

对新型非氧化性杀生剂戊二醛杀生性能进行实验室静态杀菌试验和现场应用试验，试验数据表明了戊二醛条生剂对循环冷却水中的细菌具有明显的杀灭能力，肯与磷系药剂有良好的配伍性能。     

离子液体体系中环戊烯氧化合成戊二醛的研究

在离子液沐中，采用钨酸为催化剂，用过氧化氢水溶液为氧化剂，一步催化氧化环戊烯合成戊二醛。催化体系经4次循环，催化活性未见明显降低，并进一步讨论了CPE与H2O2物料配比、反应温度、反应时间对戊二醛收率的影响，并确定了最佳合成工艺条件：n（C5H8）：n（H2O2）=1：4，反应温度40℃，反应时间8hr。戊二醛总收率73％。     

环戊烯催化氧化合成戊二醛的研究进展

综述了以环戊烯为原料氧化合成戊二醛的各种方法,对各种催化氧化方法进行了分析、评述,总结了适合于工业化生产的方法。     

W-HMS催化剂的制备及其在戊二醛合成中的应用研究

以(NH4)2WO4为钨源,采用原位法合成W-HMS催化剂,利用XRD、FTIR等手段对其结构进行了表征;以W-HMS催化环戊烯氧化合成戊二醛,考察了相关因素对戊二醛收率的影响,通过正交实验确定优化反应条件如下:叔丁醇为溶剂、反应时间为28 h、反应温度为35℃、催化剂用量为3.4979 g,在此条件下,戊二醛收率达7...     

环戊烯催化氧化合成戊二醛

介绍了以50％的H2O2为氧化剂，钨酸为催化剂，经环戊烯路线合成戊二醛的研究情况，研究结果表明了此氧化反应不能在基介质中进行，在反应温度40摄氏度，常压等较温和的条件下，产品收率达59％以上。     

WO_3/HMS催化剂多相催化氧化环戊烯合成戊二醛

以(NH4)2WO4为钨源制备的WO3/HMS分子筛为催化剂,过氧化氢为氧化剂,考察了在环戊烯氧化制备戊二醛的多相催化反应中反应时间、反应温度、催化剂质量、溶剂用量和氧化剂质量分数等因素对戊二醛收率的影响。筛选出WO3/HMS催化环戊烯(CPE)合成戊二醛反应的适宜工艺条件:n(H2O2)∶n(W)∶n(CPE)=2∶0.025∶1,V(t-BuOH)∶V(CPE)=8∶1,反应温度为35℃,反应时间为30 h。戊二醛的收率可达67%。     

环戊烯催化氧化合成戊二醛及其动力学

对在非水溶剂存在下过氧化氢一步催化氧化环戊烯制备戊二醛过程中的催化体系进行了研究。考察了具有脱水功能的Ｂ２Ｏ３的作用及用量，确立了具有优良催化性能的催化体系ＷＯ３－Ｂ２Ｏ３；实验测定了反应动力学数据，采用非线性回归Ｐｏｗｅｌ共扼法求得了反应动力学方程。在推荐的催化剂体系和工艺条件下，环戊烯转化率６７％，戊二醛收率６３％，选择性９１％。     

交联氧化淀粉胶黏剂的制备及性能研究

采用交联氧化法,先用高锰酸钾氧化可溶性淀粉制得低取代度氧化淀粉,再用戊二醛交联成交联氧化淀粉主剂,最后在高温无水条件下加入甲苯二异氰酸酯（TDI）得到氨基甲酸酯交联氧化淀粉胶黏剂。初步探讨了交联氧化机理,分析了交联氧化淀粉胶黏剂的影响因素,利用红Pb（IR）、扫描电镜（SEM）对其进行了表征,对产品的各项性能进行测试研究。结果表明,氧化程度影响其粘结性能,低取代度氧化淀粉粘结性好,且有利于淀粉进一步交联反应,交联提高淀粉耐水性,TDI能够显著提高氧化淀粉的耐水性和粘结强度。当淀粉浓度为10％,高锰酸钾用量为0．0290g,戊二醛用量为2mL,TDI用量为1mL时,制得的交联氧化淀粉胶黏剂的耐水时间为24d。     

戊二醛的制备方法

介绍了制备戊二醛的几种方法 ,分析了各种方法的优、缺点。认为过氧化氢一步氧化法是最可行的工业化生产方法。     

Gelatin supports with immobilized laccase as sustainable biocatalysts for water treatment

Millimeter-size beads of gelatin are manufactured by dripping process to give enzyme supports qualified for micropollutants biodegradation in alternative wastewater treatment. The bead diameter is dependent on the tip diameter, the gelatin solution viscosity and the swelling of polymer chains in the collecting bath. Chemical crosslinking was performed with glutaraldehyde using optimal concentration to give mechanical and thermal properties suitable for application in stirred reactor in aqueous medium. Laccases from Trametes versicolor are grafted on the gelatin beads with glutaraldehyde. Sixty percentage of the initial enzymatic activity, evaluated by the oxidation of 2′-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)diammonium salt (ABTS) is maintained after 10 successive cycles of reaction. Thermal stability at 60°C of immobilized biocatalysts is improved when compared to free enzymes (45% vs 10% of relative activity after 6 h of incubation). The simplicity of the procedure to form gelatin beads and their properties make them promising bio-based and biodegradable support for enzyme immobilization.     

Novel efficient and green approach to the synthesis of glutaraldehyde over highly active W-doped SBA-15 catalyst

In the present work, we demonstrate for the first time the use of W-doped SBA-15 catalyst prepared by a novel in situ synthesis method as highly efficient catalyst for the direct production of glutaraldehyde via selective oxidation of cyclopentene by using non-aqueous hydrogen peroxide as the green oxidant. It is suggested that the presence of a high surface concentraiton of WO_x species dispersed on well ordered hexagonal pore walls of SBA-15 support is essential to the superior performance of the catalyst for the selective oxidation of cyclopentene.     

用于环戊烯氧化合成戊二醛反应的钨基催化剂的表征

Tungsten-containing hexagonal mesoporous silica （W-HMS） supported tungsten oxide catalysts （WOx/W-HMS） was prepared for the selective oxidation of cyclopentene with aqueous hydrogen peroxide to glutaraldehyde. X-ray diffraction （XRD） results indicated that the crystal form of the active phase （tungsten oxide） of the WOx/W-HMS catalysts was dependent on the W loading and calcination temperature. X-ray photoelectron spec- troscopy （XPS） analysis revealed that the dispersed tungsten oxides on the surface of W-HMS support consisted of a mixture of W（V） and W（VI）. It was found that a high content of amorphous W species in （5＋） oxidation state resuited in the high catalytic activity. When the W loading was up to 12% （by mass） or the catalyst precursor was treated at temperature of 623 K, the catalytic activity decreased due to the presence of WO3 crystallites and the oxidation of W（V） to W（VI） on the catalyst surface. Furthermore, NH3-temperature-programmed-desorption （NH3-TPD） analysis showed that the effects of W loading and calcination temperature on the acidity of the catalysts were related to the catalytic activity. A high selectivity of 80.2% for glutaraldehyde with a complete conversion of cyclopentene was obtained over 8%WOx/W-HMS catalyst calcined at 573 K after 14 h of reaction.     

Covalently Assembled Dipeptide Nanoparticles with Adjustable Fluorescence Emission for Multicolor Bioimaging

Peptide self-assembly, inspired by the naturally occurring fabrication principle, remains the most attractive in constructing fluorescent nanoagents towards bioimaging. However, the noncovalent interactions that drive peptide self-assembly are usually susceptible to the complex physiological environment; thus leading to disassembly and dysfunction of fluorescent nanoagents. Herein, a covalently crosslinked assembly strategy for fabrication of stable peptide-based nanoparticles with adjustable emission is introduced. In the process of cationic diphenylalanine peptide (H-Phe-Phe-NH₂ ⋅ HCl) self-assembly, glutaraldehyde is used as a crosslinker and the resulting product of the Schiff base reaction can be fluorescent. More importantly, the emission wavelength can be readily tuned by controlling the covalent reaction time. It has been demonstrated that the nanoparticles are stable, even after intracellular uptake, and can be used for sustainable multicolor fluorescent imaging. The strategy with integrating peptide self-assembly and covalent crosslinking could be promising for the design and engineering of functional fluorescent nanoparticles with robust physiological stability and adjustable emission towards improved bioimaging applications.