乙二醇催化氧化制备乙二醛节能工艺比较

乙二醛是一种用途十分广泛的有机化学中间体,市场上销售的产品多是浓度为30~40%的乙二醛水溶液,在纺织印染、建材、皮革、医药、农药、国防、涂料、轻工、粘合剂和环保等方面具有广泛的应用,国内现有生产装置多采用乙二醇催化氧化工艺,对于乙二醇氧化工艺降低生产能耗具有重大意义。     

水溶性三聚氰胺乙二醛树脂的结构与性能

以三聚氰胺、乙二醛为原料,制备了水溶性三聚氰胺乙二醛(MG)树脂。用FT-IR、XRD、DSC和TGA对聚合物结构进行了表征,通过SEM观察了纸张表面及断面的微观结构。FT-IR证实了MG中各单体单元的存在,XRD表明MG树脂属于非晶态聚合物。DSC测定结果显示聚合物的玻璃化转变温度为53.95℃。TGA表明聚合物的起始分解温度较高,满足涂布造纸工艺的温度要求。当w(MG)从0%增大到4%时,纸张表面强度逐渐增大,油墨吸收率保持29%以上,该抗水剂对提高纸张的抗水效果和印刷性能具有明显作用。     

Reactive extrusion of zein with glyoxal

Cross‐linked zein has been produced using glyoxal (GLY) as the cross‐linking reagent via reactive extrusion for the first time in a twin screw extruder using dilute sodium hydroxide as catalyst. Tri(ethylene glycol) was used as a plasticizer for various items. The extrudate was then ground and processed using either compression or injection molding. At the highest level of GLY (6%), tri(ethylene glycol) was used at 10% as a plasticizer to allow further processing to take place. With this formulation, samples could be obtained from the injection mold, however, the samples did not hold their molded shape due to the elasticity of the sample at the mold temperature. When lower levels of GLY were used, injection molded sample bars of similar quality to control were obtained. The physical properties of these samples were similar to control. At GLY levels of 1.75% and higher, the samples were resistant to dissolution by acetic acid. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

1-氨基-1,2,3-三唑的合成

以乙二醛、水合肼为起始原料反应得到乙二醛双腙,经活性MnO2催化氧化成环制得1-氨基-1,2,3-三唑,采用红外光谱、元素分析、核磁共振和质谱对其进行了表征。就中间体乙二醛双腙重结晶纯化、氧化剂MnO2用量优化、产物纯化方法等几方面进行了改进,优化了1-氨基-1,2,3-三唑的合成工艺,得到了高纯(96%)的1-氨基-1,2,3-三唑。并对1-氨基-1,2,3-三唑的成环和分解机理进行了讨论。     

用双氧水／乙二醛对真丝绸低温染色

本文就双氧水/乙二醛氧化还原系统,对蚕丝织物低温染色进行了研究。讨论了影响染色的若干因素,并制定了可行的染色工艺,在染色机理方面也作了初步探讨。     

可溶性淀粉-乙二醛对棉织物免烫整理的研究

本文对可溶性淀粉-乙二醛用于棉织物免烫整理的整理工艺进行了研究.结果表明:用可溶性淀粉-乙二醛对棉织物进行免烫整理,其效果优于树脂整理和其它低醛或无醛免烫整理,整理工艺简单,原料来源方便,没有环境污染,整理过的织物符合人体卫生要求,耐洗性好,是一种具有市场开发价值的免烫整理技术,值得推广应用.     

乙二醛在纳米TiO2-Pt电极上的电催化氧化

通过电沉积修饰铂微粒制备Ti基纳米TiO₂-Pt（Ti/nano-TiO₂-Pt）修饰电极,采用循环伏安法研究了乙二醛在Ti/nano-TiO₂-Pt上的电催化氧化。结果表明：Ti/nano-TiO₂-Pt修饰电极对乙二醛的氧化呈现较高的电催化活性,可作为乙二醛电氧化合成乙醛酸的高活性催化电极。     

Lignin‐based polycondensation resins for wood adhesives

Lignin‐based wood adhesives are obtained that satisfy the requirements of relevant international standards for the manufacture of exterior‐grade wood particleboard. Formulations based on low molecular mass lignin and presenting an increase in the relative proportion of reactive points yield better results than the higher molecular mass lignin used in the past. These lignins allow a higher proportion of hydroxymethylation during preparation of methylolated lignins. These lignin‐based adhesives also yield acceptable results at particleboard pressing times that are sufficiently low to be of industrial significance. Lignin‐based wood adhesives, in which a nonvolatile nontoxic aldehyde (glyoxal) is substituted for formaldehyde in their preparation, are prepared and tested for application to wood panels such as particleboard. The adhesives yield good internal bond strength results for the panels, which are good enough to comfortably pass relevant international standard specifications for exterior‐grade panels. The adhesives also show sufficient reactivity to yield panels in press times comparable to that of formaldehyde‐based commercial adhesives. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1690–1699, 2007     

尿囊素的合成研究

提出了一种合成尿囊素的新方法。以乙二醛为原料 ,采用杂多酸—磷钨酸做催化剂 ,先用过氧化氢做氧化剂氧化制得乙醛酸 ,再与尿素直接缩合生成尿囊素 ,总收率可达 5 8.6%。研究了氧化反应温度、催化剂用量对尿囊素产率的影响。确定了最佳工艺条件 :( 1) 40 %乙二醛水溶液 72 .4g ,3 0 %过氧化氢水溶液 62 .3g ,磷钨酸 0 .2 5 g ,在 5± 2℃下 ,搅拌反应 5～ 6h ;( 2 )尿素 96g ,在75～ 80℃之间 ,搅拌反应 2h。     

氧气法合成乙醛酸的中试研究

中试结果表明 ,在复合催化剂作用下 ,用低压氧气氧化乙二醛水溶液 ,可成功合成乙醛酸。电位滴定跟踪反应过程 ,可满意监控乙二醛反应程度。此反应乙二醛转化率 99% ,乙醛酸收率(以乙二醛为基准 ) 94 %。优化工艺为 :介质 pH <1,釜内氧气、水气等混合气体总压 0 12～ 0 13MPa ,w(乙二醛 ) =15 5 6 % ,反应温度 4 5～ 6 0℃ ,时间 4h。