| 1. | Study of the purification of m - xylene and m - toluic
间二甲苯和间甲基苯甲酸分离提纯工艺的研究 |
| 2. | Adsorption characteristics of catalysts used for ammoxidation of m - xylene to isophthalonitrile
工业用间二甲苯氨氧化催化剂的表面吸附特征研究 |
| 3. | These samples were then sent to the government laboratory for testing on the concentration of benzene , toluene and m - xylene in the goods
测试结果显示，五款样本中的其中一款在拆封当日被验出苯成份为每公斤计0 |
| 4. | Toluene and m - xylene are not cancer - causing substances . their effects on health depend on the level one is exposed to and the duration of exposure
甲苯和间二甲苯并非致癌物质，对人体影响需视乎个人处于甲苯和间二甲苯成份的水平和时间。 |
| 5. | Standard test method for determination of benzene , toluene , ethylbenzene , p m - xylene , o - xylene , c9 and heavier aromatics , and total aromatics in finished gasoline by gas chromatography
气相色谱法测定精炼汽油中苯甲苯苯乙烯对间-二甲苯邻二甲苯c9重芳烃和全部芳烃的标准试验方法 |
| 6. | The government chemist conducted the tests again on the seventh day after unpacking the samples . it did not detect benzene , toluene and m - xylene in all the five models of plastic mats
政府化验所在样本拆封七日后再测试该五款样本，结果显示五款样本均没有验出苯、甲苯和间二甲苯成份。 |
| 7. | The order of biochemical property is toluene better than m - xylene , m - xylene better than benzene , benzene better than p - xylene , p - xylene better than ethylbenzene and ethylbenzene better than o - xylene
实验条件下生化降解难易顺序是：甲苯间二甲苯苯对二甲苯乙基苯邻二甲苯。 |
| 8. | As to the separation of p - xylene / m - xylene , in order to blend polymer hydrophobe with p - cd which is preferential to adsorb p - xylene , etherified p - cd was synthesized using benzyl chloride ( phch2cl ) . the influences of etherification conditions on the reaction conversion and the degree of substitution of etherified p - cd were investigated . the reaction conversion increases with the increasing of molar ratio of phcr ^ cl : p - cd and the concentration of p - cd
对于px mx体系的分离，为使对px具有优先络合能力的一环糊精( cd )能够与油溶性高分子共混，本文采用williamson合成法运用氯化苄( phch _ 2cl )使-环糊精( - cd )醚化，并由元素分析结果，计算出醚化产物的取代度和转化率，系统地考察了反应条件对转化率和取代度的影响。 |
| 9. | The substitution of pervaporation for traditional separation in organic mixtures is of energy - saving and environment - protecting significance . in this paper , pervaporation of two kinds of organic mixtures is investigated : one is using ca membrane and ca - eva ( ethylene - co - ethylene acetate ) composite membrane for methanol removal from mtbe ( methyl t - butyl ether ) , focused on the influence of casting solvent mixtures ; the other is utilizing proper membrane stuff and additive to separate p - xylene from m - xylene
本文对两类有机有机混合体系进行了渗透汽化膜过程的研究，其一为醋酸纤维素( ca )膜及ca -乙烯醋酸乙烯共聚物( eva )复合膜用于甲基特丁基醚( mtbe )中少量甲醇( 5 meoh )的脱除，探讨铸膜混合溶剂及后处理技术对膜分离性能的影响。其二为运用适当的膜材料及添加剂去除间二甲苯( mx )中的少量对二甲苯( 10 px ) 。 |
