缩乙二醇双甲基丙烯酸酯的合成与研究

研究了用直接酯化法合成缩乙二醇双甲基丙烯酸酯．并摸索出双酯合成的有效方法．具有工艺简单、原料易得、操作简便等优点．合成的产品产率高、纯度高、色泽好。     

乙二醇甲基辛基醚的合成及应用

为使环戊二烯甲基化反应顺利进行。合成具有特定功能的高沸点溶剂乙二醇甲基辛基醚,将此溶剂进行功能性应用实验;制备钠砂,对环戊二烯钠盐具有络合作用,与制成的甲基环戊二烯容易分离等都取得较好效果。同时,介绍乙二醇甲基辛基醚的制备方法,总收率达66．2％。     

乙醇乙氧基化研究

以环氧乙烷及无不乙醇为原料,在催化剂作用中成乙二醇单乙醚,考察了催化剂用量,温度,反应物麻尔比,反应时间等因素的对转化率,产率的影响,该工艺过程简单,操作容易,三废少,选择性能,高率高,生产的产品是一种性能优异的理想溶剂。     

Partial oxidation of n-hexadecane and polyethylene in supercritical water

In this study, we show the results of partial oxidation experiments of n-hexadecane (n-C₁₆) and polyethylene (PE) in supercritical water (SCW). The experiments were carried out at 673 or 693 K of reaction temperature and 5 or 30 min of reaction time using a 6 cm³ of a batch type reactor. Water density ranged from 0.1 to 0.52 g/cm³ (water pressure: 20–40 MPa). The loaded amount of oxygen was set to 0.3 of the ratio of oxygen atom to carbon atom. Some experiments were made using CO instead of oxygen for the partial oxidation of n-C₁₆ and PE to explore the effect of water gas shift reaction. In the results of partial oxidation of n-C₁₆, the yield of CO and some compounds containing oxygen atoms, such as aldehydes and ketones increased with increasing water density. Moreover, 1-alkene/ n-alkane ratio in the products decreased with increasing water density. The 1-alkene/n-alkane ratio was lower than that of pyrolysis in SCW. Also for the case of PE experiments, in dense SCW (0.42 g/cm³), the 1-alkene/n-alkane ratio in partial oxidation was lower than that in SCW pyrolysis. In the case of CO experiments for n-C₁₆ and PE, 1-alkene/n-alkane ratio was a little lower than that of pyrolysis in SCW. These results show that the yield of n-alkane, which is a hydrogenated compound, was higher through water gas shift reaction in SCW and also through partial oxidation in SCW. Therefore, these results suggest the possibility of hydrogenation of hydrocarbon through partial oxidation followed by the water gas shift reaction.     

多元醇对白炭黑填充NR胶料性能的影响

研究了多元醇品种及其用量对白炭黑填充NR硫化胶性能的影响。试验结果表明,多元醇能促进白炭黑填充NR胶料硫化,二甘醇的活性最高,硫化速度最快,物理性能最优,其次分别为三乙醇胺、乙二醇、聚乙二醇、丙三醇、每种多元醇都存在各自的最佳用量,二甘醇、乙二醇、聚乙二醇、丙三醇和三乙醇胺的最佳用量分别为：2.0,2.0～3.0,2.2,1.8～2.2和3.0～3.2份。     

相转移催化合成11-脱氧甘草次酸-3-位酯类衍生物

以甘草次酸为原料 ,经还原制得 1 1 -脱氧甘草次酸 ,然后在聚苯乙烯固载化聚乙二醇 40 0( PS- PEG- 40 0 )的催化下。合成了七种具有潜在药理活性和应用前景的 1 1 -脱氧甘草次酸 - 3-位酯类衍生物。合成方法简单 ,产率较高 ,后处理方便     

气相色谱法测定PTT中的DPG含量

采用毛细管气相色谱法测定了聚对苯二甲酸丙二酯 ( PTT)产品中 1,3-二丙二醇 ( DPG)的含量 ,用乙醇胺降解法对 PTT大分子进行降解处理 ,选用了 CBP-W2 5 -10 0毛细管柱 ,氢火焰检测器 ,并用 1,6-己二醇作内标。结果表明 ,DPG的最低检测限为 0 .0 5 % ,相对标准偏差为 0 .78% ,平均回收率为10 0 .3%     

Fatigue Behavior of a Pavement Foundation with Recycled Aggregate and Waste HDPE Strips

A laboratory investigation was conducted to evaluate the fatigue behavior of an alternative pavement foundation material containing cement stabilized reclaimed crushed aggregate. Class C fly ash, and waste-plastic strip [high density polyethylene (HDPE)] reinforcement. The primary motivation for this research was to evaluate a composite that contained more than 90% recycled materials for use as an alternative foundation layer underneath conventional flexible or rigid pavement. The specific objectives of this study were (1) to evaluate the flexural fatigue behavior of the new composite, and (2) to evaluate the accumulation of fatigue damage in the material. The results indicate that the fatigue resistance of this material is similar to other traditional stabilized pavement materials. It was found that the dynamic elastic modulus remained approximately constant (degraded slowly) for most specimens up to the end of fatigue life. Fatigue damage computed using a dissipated energy approach showed that the damage accumulation in this material approximately follows Miner's rule for cumulative damage, which is often used in pavement engineering.     

电机变频控制实现换热器节能的应用研究

结合寒冷地区气候特点与通信机房温控的现状,针对50%浓度乙二醇溶液为工质的换热器,试验研究了自然冷源利用率与换热器自身变频节能的关系。结合乙二醇冷剂的特性,通过建立功率与频率关系模型、温差与功率和频率关系模型,实现了换热器循环泵和风机的变频控制策略。结果表明:在室内外温差、换热功率与循环泵、风机频率同时满足的条件下,以功率模型作为参数进行换热器自身的变频节能是可行的。通过对哈尔滨地区的气候数据与散热房控温试验分析,证明了乙二醇换热器的变频节能效果。     

Real-time monitoring of hemicellulose liquefaction in ethylene glycol

Xylan was used as a model material to study the liquefaction of hemicellulose in the presence of ethylene glycol. The ReactIR^TM reaction analysis system was used to monitor the entire liquefaction process online. The results showed that xylan was decomposed and transferred to liquid phase. The gel permeation chromatography results of the liquid products showed that the weight average molecular of xylan decreased signi?cantly to around 1728 g/mol after liquefaction. Gas chromatography-mass spectrometry revealed that the ethylene glycol liquefaction products from xylan include ethylene glycol and its derivatives, alcohols, aldehydes, ketones, some acids and their esters.