酸改性膨润土负载ZnCl2催化松节油直接异构-歧化反应研究

以自制酸改性膨润土负载ZnCl2为催化剂,采用傅里叶红外光谱( FT-IR) 和气相色谱-质谱联用(GC-MS)技术对松节油直接催化异构-歧化液相反应进行研究.FT-IR 分析表明,在反应产物谱图中蒎烯吸收峰3023 cm-1、1653 cm-1和3067 cm-1消失,苯环的骨架吸收峰1645 cm-1 和1456 ...     

糠醛-环己醇-莰烯三元气液平衡数据的测定

利用自制气液平衡装置测定糠醛-环己醇、糠醛-莰烯和糠醛-环己醇-莰烯在101.3kPa下的气液平衡数据。对所测得的数据进行关联与计算,得到Wilson方程参数。代入Wilson模型,计算出101.3KPa条件下糠醛-环己醇、糠醛-莰烯2组二元体系的温度与气相组分的质量分数,与实验值比偏差不大,说明实验可行。用面积积分法验证两组二元气液平衡数据的热力学一致性,结果符合要求。通过测定糠醛-环己醇-莰烯三元气液平衡数据,并进行拟合,得到421.5K时糠醛的气相物质的量分数相对最高,环己醇的气相物质的量分数又相对最低,即在该温度下分离糖醛分环己醇较好,可为工程上分离糠醛和环己醇提供理论依据。     

Allelopathic Effects of Volatile Monoterpenoids Produced by <Emphasis Type="Italic">Salvia leucophylla</Emphasis>: Inhibition of Cell Proliferation and DNA Synthesis in the Root Apical Meristem of <Emphasis Type="Italic">Brassica campestris</Emphasis> Seedlings

Salvia leucophylla, a shrub observed in coastal south California, produces several volatile monoterpenoids (camphor, 1,8-cineole, -pinene, -pinene, and camphene) that potentially act as allelochemicals. The effects of these were examined using Brassica campestris as the test plant. Camphor, 1,8-cineole, and -pinene inhibited germination of B. campestris seeds at high concentrations, whereas -pinene and camphene did not. Root growth was inhibited by all five monoterpenoids in a dose-dependent manner, but hypocotyl growth was largely unaffected. The monoterpenoids did not alter the sizes of matured cells in either hypocotyls or roots, indicating that cell expansion is relatively insensitive to these compounds. They did not decrease the mitotic index in the shoot apical region, but specifically lowered mitotic index in the root apical meristem. Moreover, morphological and biochemical analyses on the incorporation of 5-bromo-2-deoxyuridine into DNA demonstrated that the monoterpenoids inhibit both cell-nuclear and organelle DNA synthesis in the root apical meristem. These results suggest that the monoterpenoids produced by S. leucophylla could interfere with the growth of other plants in its vicinity through inhibition of cell proliferation in the root apical meristem.     

用动态累积分批精馏法从莰烯下脚料中提取柠烯

动态累积分批精馏法具有分离效率高的优点,用于从莰烯下脚料中分离柠烯较之传统分批蒸馏方法,在填料层高度减少了一半,分离时间减少了一半的情况下,效率提高约７％．     

有机碱对莰烯直接乙酰化的影响

研究了在含氮有机碱存在下的莰烯直接乙酰化反应，结果表明，在反应中加入与莰烯等摩尔的六氢吡啶，有利于莰烯乙酰化反应，在反应液中的酰化产物ω－乙酰基莰烯含量最高达到56％，大大超过异构化产物乙酸异冰片酯。     

Production of Camphene by Isomerization Reaction on Sulfated ZrO2

Abstract The kinetics of camphene production in liquid phase from α-pinene was experimentally determinedin an isothermal batch reactor.To this end,a sulfated ZrO_2 catalyst was used and the reaction studied in thetemperature range of 370-403K.By analyzing the experimental data,second reaction order for α-pinene wasfound.A kinetic model is presented which includes term for the catalyst load used.The specific rate constant at393K was 2.19×10~(-3)mol.L~(-1),min~(-1),the activation energy being 93kJ.mol~(-1).Both Vaues are within the rangeof literature results.     

Heterogeneous catalyzed isomerization of turpentine oil by ordered mesoporous materials like M41S structures

Herein, the synthesis of a structure with a porous system similar to that of molecular sieves, MCM-41 and 48 types, with the incorporation of heteroatoms in their synthesis, is reported. The catalytic activity of these materials was tested in the isomerization reaction of turpentine oil to obtain camphene. The best results were obtained with Zn-Al-Si-MCM, a mesoporous material, with a conversion of up to 96% and selectivities of 31% and 22% to camphene and 4-carene, respectively, both of which are bicyclic products. The recycling of the catalyst was also tested, and after three cycles, no significant loss of activity was observed.     

水合法合成樟脑脱氢工段溶剂选择

介绍了水合法合成樟脑脱氢工艺中使用回收莰烯取代二甲苯作溶剂，降低了生产成本，稳定了产品质量，减少了环境污染，取得了良好的社会、经济效益。     

响应面法优化微波辐射合成甲基丙烯酸异冰片酯

以莰烯和甲基丙烯酸为原料,采用微波辐射法合成了甲基丙烯酸异冰片酯(IBOMA),通过FTIR及1HNMR对产物的结构进行了表征,在微波反应时间、反应温度、微波功率、莰烯与甲基丙烯酸物质的量比及催化剂Amberlyst15用量等单因素实验基础上,通过Design Expert8.0中的中心响应面法对反应条件进行了优化,确定最佳合成工艺为:催化剂用量为10%(以莰烯与甲基丙烯酸总质量为基准)、n(莰烯)∶n(甲基丙烯酸)=1.0∶0.8、微波反应时间25 min、反应温度43℃、功率为400 W。在此工艺条件下,IBOMA的酯化率可达到82.83%。     

ω-氯甲基莰烯的高效快速合成及抑菌活性

以ω-乙酰氧甲基莰烯、乙酰氯、无水乙醇为原料，通过卤代反应，合成ω-氯甲基莰烯，通过FT-IR、¹H NMR、¹³C NMR和LC-HRMS等对产物进行了结构表征。研究结果表明：反应时间、反应物料比对卤代反应有较大的影响，在温度为30℃、n（ω-乙酰氧甲基莰烯）：n（乙酰氯）：n（无水乙醇）为1：2：2的条件下反应5 min，ω-乙酰氧甲基莰烯的转化率和ω-氯甲基莰烯产率分别高达97.5%和95.2%。微量肉汤二倍稀释法抑菌活性实验结果表明：ω-氯甲基莰烯能抑制细菌和真菌的生长，对4种细菌（大肠杆菌、肺炎克雷伯菌、金黄色葡萄球菌、枯草芽孢杆菌）的最低抑菌质量浓度（MIC）分别为125、62.5、15.63、250 mg/L，对3种真菌（白色念珠菌、热带念珠菌、黑曲霉）的MIC均为31.25 mg/L，抑菌活性明显高于莰烯、ω-乙酰氧甲基莰烯和ω-羟甲基莰烯，对白色念珠菌的抑菌活性与阳性对照品酮康唑相当。