Recent Developments in the Chemistry of Woody Odorants

Woody odorants constitute an important olfactory family in perfumery. Essential wood oils, traditionally being obtained by steam distillation of plant materials, are extensively being used in a variety of perfumes. Patchouli oil （e. g. in “Gentlemen”, Givenchy）, vetiver oil （“Vetiver”, J. P. Guerlain） and cedar wood oil （“Déclaration”, Cartier） are classics in this field. On the other hand, many terpenic hydrocarbons which are perse not particularly useful as perfume ingredients,     

生物除臭技术在南方某污水处理厂的应用研究

南方某污水处理厂位于该市中心,污水处理厂的臭气问题严重影响周边居民的日常生活.为治理恶臭气体污染,本文根据老污水处理厂的具体情况,将格栅、沉砂池等处的臭气集中起来,采用生物滤池法进行处理,达到了较理想的技术、经济目标.     

活性炭对卤代苯甲醚类嗅味物质的吸附特性

探究了椰壳酸洗活性炭、椰壳水洗活性炭、煤质活性炭、果壳活性炭、木质活性炭等对2,4,6-三氯苯甲醚（2,4,6-trichloroanisole, 2,4,6-TCA）和2,4,6-三溴苯甲醚（2,4,6-tribromoanisole, 2,4,6-TBA）的吸附等温线和吸附动力学。研究发现5种活性炭均可有效吸附卤代苯甲醚,吸附等温线都能较好拟合Freundlich模型（R²>0.97）。其中果壳活性炭和椰壳活性炭吸附效果较好,果壳活性炭对2,4,6-TCA的吸附常数（K_F）最大,为11.90,椰壳酸洗活性炭对2,4,6-TBA的吸附常数（K_F）最大,为9.47。五种活性炭的吸附过程均符合拟二级动力学模型（R²>0.97）,椰壳水洗活性炭对2,4,6-TCA的吸附最快,椰壳酸洗活性炭对2,4,6-TBA的吸附最快。以椰壳酸洗活性炭为研究对象,探究其吸附机制和主要影响因素,结果表明内扩散是主要限速步骤,化学吸附是主要吸附机制,初始底物浓度和溶解有机物对吸附效果影响较大。     

异味污染关键致臭物质精准识别研究进展

围绕国内外致臭物质的识别方法,论述国内外相关研究的概况,并指出现有研究存在的不足之处.结果表明:目前致臭物质识别方法较为单一,气味活度值法是当前致臭物质筛选的常规方法,但实际应用发现,筛选结果具有一定偏差;气相色谱-嗅觉测定法在技术上较为先进,实现了化学浓度和感官评价同时分析,但存在分析时间长、对嗅辨员要求较高等问题....     

影响三点比较式臭袋法测定臭气浓度的因素及其解决途径

根据实际工作经验,分析三点比较式臭袋法测定臭气浓度的影响因素.认为该方法在测定过程中容易受到嗅辨小组的性别、年龄、注意力和测定时间、测定环境的温湿度影响.提出在运用该方法进行测定时应注意严格挑选嗅辨员,充分考虑性别比例和年龄比例搭配,要合理布置监测采样任务,科学安排实验室样品测定,要营造舒适和谐的实验室环境,调节和稳定嗅辨员的最佳状态,要周全考虑,注意细节,最大程度地减少干扰和影响,以提高方法的精密度和准确度.     

优势菌膜生物反应器处理洗车废水的研究

采用优势菌强化膜生物反应器，对洗车废水进行生物处理，改善出水颜色和气味．常温下水力停留时间为4h，气水比为50，污泥浓度为3500mg／L时，化学需氧量的降低几乎全部由生物系统完成，以利于减少膜污染，延长膜寿命．将优势苗与膜生物反应器结合，能够充分发挥生物处理与膜分离工艺的优势，促进膜生物反应器的推广应用．     

天然植物除臭剂的应用试验

就Ecolo公司提供的天然植物除臭剂在食品加工过程中的除臭性能进行了试验，确定了较好的配方及用量，其中1#工作液对H2S去除率达到99％。1#、4#工作液对NH3去除率在98．5％以上。     

Purification of Orange Roughy Oil

In this work, some treatments of the orange roughy oil have investigated by analysis of UV - Visible spectra and gas chromatography. When the raw oil is treated by thepartial hydrogenation under ordinary pressure at 100℃, not only the highly unsaturatcd fatty oil will be reduced partially, but also the odor and re - odor of the fish oil would be decreased.     

Organocatalytic Domino-methylenation/Diels-Alder Reactions

1 Results Organocatalytic reactions are currently very much en vogue as the term implies a connotation of ecologically benign chemistry.In addition,beautiful new results have been achieved over the last few years which triggered a dramatic increase in publications[1].Related to this topic is the catalysis of organic transformations by hydrogen bond donors and organic Brnsted acids[2].From an industrial point of view,these reactions can be beneficial when performed in water in high concentration,prerequ...     

Responses of the cavefishAstyanax mexicanus (Anoptichthys antrobius) to the oder of known or unknown conspecifics

Summary Juvenile individuals of the cave characidAstyanax mexicanus recognize to a significant extent, in a choice-apparatus, the odor of known conspecifics as compared to that of unknown ones during the first 2 min of a 10-min experiment. After this initial oriented response, exploration becomes random.