Method for preparing carbonyl fluoride from p-trichloromethylphenyl isocyanate

Abstract

The invention provides a method for preparing carbonyl fluoride from p-trichloromethylphenyl isocyanate. The method is a new one in which the carbonyl fluoride is safely and effectively obtained by reacting hydrogen fluoride and phenyl isocyanate; and the method can ensure that the reaction proceeds towards the direction of generating the carbonyl fluoride maximally. The method provided by the invention comprises the following steps: in the presence of the phenyl isocyanate and the excessive hydrogen fluoride, performing a first reaction on the hydrogen fluoride and the phenyl isocyanate at a low temperature; performing heating to perform a second reaction; collecting a p-trifluoromethyl aniline product; and performing cooling to collect the liquid hydrogen fluoride, introducing the uncondensed gas into a rectification tower, performing rectification, and performing separation to obtain hydrogen chloride and the carbonyl fluoride. The method provided by the invention can ensure high reaction yield, high product purity, mild reaction conditions and favorable safety; and on the basis of producing the carbonyl fluoride, the hydrogen fluoride, the hydrogen chloride and the p-trifluoromethyl aniline can be produced simultaneously, and no pollutant is discharged, thereby meeting environmental requirements.

Description

technical field [0001] The present invention provides a method for producing carbonyl fluoride, which is a new method capable of reacting hydrogen fluoride and p-trifluoromethylphenylisocyanate to safely and effectively obtain high-purity carbonyl fluoride. Background technique [0002] Carbonyl Fluoride (COF 2 ) has been used as a substitute for a gas with a high global warming coefficient, which has been used as a cleaning gas for CVD (Chemical Vapor Deposition) equipment used in the semiconductor industry, etc., and its demand is gradually expanding. [0003] Currently about COF 2 The synthesis methods mainly include: [0004] 1. Take CO and CO 2 the method of manufacture of the raw material; [0005] 2. A synthetic method using phosgene as a raw material; [0006] 3. A production method using trifluoromethane or chlorodifluoromethane as a raw material; [0007] 4. A synthetic method using tetrafluoroethylene and oxygen as raw materials. [0008] Method 1, due to C...

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Problems solved by technology

[0013] However, in the above reaction, it is difficult to carry out the reverse reaction, because it is relatively easy to remove hydrogen fluoride from the intermediate carbamoyl fluoride to obtain isocyanate, but it is relatively easy to generate the intermediate carbamoyl fluoride from the reaction of isocyanate and hydrogen fluoride. Difficult to respond

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