사불화메탄 C화학적 특성, 용도, 생산
개요
Tetrafluoromethane, CF4, also known as carbon tetrafluoride and fluorocarbon 14, is a colorless gas that is slightly soluble in water.
화학적 성질
colourless gas
용도
Low tempereture refrigerant; gaseous insulator.
일반 설명
Tetrafluoromethane is a colorless nonflammable gas. Carbon tetrafluoride is shipped as a liquid under pressure. Carbon tetrafluoride may be narcotic at high concentrations. Under prolonged exposure to fire or heat the containers may rupture violently and rocket. Carbon tetrafluoride is used as a refrigerant.
반응 프로필
The reaction of aluminum with various halogenated hydrocarbons produces a self-sustaining reaction with sufficient heat to melt aluminum pieces, examples of other halogenated hydrocarbons are fluorotrichloromethane, dichlorodifluoromethane, chlorodifluoromethane, tetrafluoromethane. The vigor of the reaction appears to be dependent on the combined degree of fluorination and the vapor pressure [Chem. Eng. News 39(27):44. 1961].
위험도
Toxic by inhalation.
건강위험
Vapors may cause dizziness or asphyxiation without warning. Vapors from liquefied gas are initially heavier than air and spread along ground. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire may produce irritating, corrosive and/or toxic gases.
화재위험
Some may burn but none ignite readily. Containers may explode when heated. Ruptured cylinders may rocket.
Safety Profile
Mddly toxic by
inhalation. Less chronically toxic than
carbon tetrachloride. Violent reaction with
Al. When heated to decomposition it emits
toxic fumes of F-. See also FLUORIDES.
잠재적 노출
Tetrafluoromethane is used in fire extinguishers and as a low temperature refrigerant.
운송 방법
UN1982 Tetrafluoromethane, compressed or or Refrigerant gas R14, Hazard Class: 2.2; Labels: 2.2Nonflammable gas. Cylinders must be transported in a secure upright position, in a well-ventilated truck. Protect cylinder and labels from physical damage. The owner of the compressed gas cylinder is the only entity allowed by federal law (49CFR) to transport and refill them. It is a violation of transportation regulations to refill compressed gas cylinders without the express written permission of the owner.
Purification Methods
Purify CF4 by repeated passage over activated charcoal at solid-CO2 temperatures. Traces of air are removed by evacuating while alternately freezing and melting. Alternatively, liquefy CF4 by cooling in liquid air and then fractionally distil it under vacuum. (The chief impurity originally present is probably CF3Cl). Use brass equipment. It is non-flammable. [Beilstein 1 H 59, 1 I 8, 1 II 11, 1 III 35, 1 IV 26.]
비 호환성
Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides. Forms hydrogen fluoride and fluorides on decomposition with hot surfaces above 125F/52C or open flame. Incompatible with powdered metals; including aluminum, zinc, and beryllium.
폐기물 처리
Return refillable compressed gas cylinders to supplier. Nonrefillable cylinders should be disposed of in accordance with local, state and federalregulations. Allow remaining gas to vent slowly into atmosphere in an unconfined area or exhaust hood. Refillabletype cylinders should be returned to original supplier with any valve caps and outlet plugs secured and valve protection caps in place.
사불화메탄 준비 용품 및 원자재
원자재
실리카겔
디클로로디플루오로메탄
크롬(III) 수산화물
실리콘 카바이드
Nickel tube
Petroleum coke
플루오르화칼슘
사염화탄소
테트라플루오르히드라진
Sulfur, pentafluoro(1,1,2,2,2-pentafluoroethyl)-, (OC-6-21)-
Ethanamine, heptafluoro-
헥사플루오로에테인(헥사플루오르에탄)
육불화황
테트라플루오린화 황(테트라플루오르화 황)
2-Penten-3-amine, 1,1,1,4,4,5,5,5-octafluoro-N,N-dimethyl-2-(trifluoromethyl)-
Methane, oxybis[trifluoro-
플루오린화 카보닐
준비 용품
