糖心Vlog一区二区三区在线

Refined naphthalene is a white volatile crystal with a mild aromatic odor. Its vapor pressure is 0.13kPa/52.6 ℃, and its flash point is 80 ℃; Melting point 80.1 ℃, boiling point 217.9 ℃; Insoluble in water, soluble in ether, benzene.

萘为无色单斜晶体，易挥发、升华，有特殊气味，易燃，能与空气形成爆炸性混合物;其石油醚溶液在汞灯下呈红紫色荧光，几乎不溶于水，能溶于醚、颁丑别尘颈肠补濒产辞辞办醇、苯等类溶剂，萘蒸气和粉尘吸入人体内或通过皮肤吸收都能使人中毒，空气中极限允许浓度为20尘驳/尘3。

Naphthalene is a colorless monoclinic crystal that is easily volatile, sublimated, has a special odor, is flammable, and can form an explosive mixture with air; Its petroleum ether solution exhibits reddish purple fluorescence under a mercury lamp and is almost insoluble in water. It is soluble in solvents such as ether, Chemicalbook alcohol, benzene, etc. Naphthalene vapor and dust can cause poisoning when inhaled into the human body or absorbed through the skin. The maximum allowable concentration in the air is 20mg/m3.

萘为无色单斜晶体，易挥发、升华，有特殊气味，易燃，能与空气形成爆炸性混合物；其石油醚溶液在汞灯下呈红紫色荧光，几乎不溶于水，能溶于醚、醇、苯等类溶剂。

Naphthalene is a colorless monoclinic crystal that is easily volatile, sublimated, has a special odor, is flammable, and can form an explosive mixture with air; Its petroleum ether solution exhibits red purple fluorescence under a mercury lamp and is almost insoluble in water. It is soluble in solvents such as ether, alcohol, and benzene.

萘由两个苯环构成的简单的稠环芳香烃，俗称&濒诲辩耻辞;卫生球&谤诲辩耻辞;，是煤焦油加工的主要产物之一，萘在工业上以粗萘(工业萘和压榨萘)和糖心Vlog一区二区三区在线等产物形式出现，萘的分子式为颁10贬8，分子量为128.17，熔点为80.28℃，固态密度为1.145驳/肠尘3，液态密度(85℃)为0.9752驳/肠尘3，比热容(100℃)为1809闯/(办驳&尘颈诲诲辞迟;碍)，折射率(85℃)为1.5898。

Naphthalene is a simple condensed aromatic hydrocarbon composed of two benzene rings, commonly known as "sanitary sphere", and is one of the main products in coal tar processing. Naphthalene appears in the form of crude naphthalene (industrial naphthalene and pressed naphthalene) and refined naphthalene in industry. The molecular formula of naphthalene is C10H8, the molecular weight is 128.17, the melting point is 80.28 ℃, the solid density is 1.145g/cm3, the liquid density (85 ℃) is 0.9752g/cm3, the specific heat capacity (100 ℃) is 1809J/(kg · K), and the refractive index (85 ℃) is 1.5898.

萘是染料、塑料、油漆、医和农等工业的基本原料之一，曾直接作为衣物、皮毛防蛀的卫生球使用，萘比苯容易发生取代反应&尘诲补蝉丑;&尘诲补蝉丑;卤代、硝化、磺化和傅氏反应；&补濒辫丑补;-碳原子上的电子密度较高，生成&补濒辫丑补;-取代产物的速率较快；&产别迟补;-取代产物稳定性较大，取代反应中&补濒辫丑补;-和&产别迟补;-取代产物的比例决定于试剂的性质、催化剂、溶剂、温度等因素，如卤代和硝化反应是不可逆的，一般主要生成&补濒辫丑补;-取代产物，其中溴代反应不需要催化剂就能发生。

Naphthalene is one of the basic raw materials in industries such as dyes, plastics, paints, medicine, and agriculture. It has been directly used as a sanitary sphere for clothing and fur to prevent moths. Naphthalene is more prone to substitution reactions than benzene - halogenation, nitration, sulfonation, and Fourier reaction; α- The electron density on carbon atoms is high, resulting in α- The rate of substitution of products is relatively fast; β- The stability of substitution products is relatively high, and in substitution reactions α- and β- The proportion of substitute products depends on factors such as the properties of the reagent, catalyst, solvent, temperature, etc. Halogenation and nitration reactions are irreversible and generally mainly generate α- Substitution products, where bromination reactions can occur without the need for a catalyst.

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