Method for synthesizing halogenated alkanes

Abstract

The invention discloses a method for synthesizing halogenated alkanes, which comprises the following steps of: adding 20 to 30 weight parts of solvent and 0.3 to 0.8 weight part of catalyst into 10 to 60 weight parts of halogens and 26 to 48 weight parts of fluorine-containing olefins, which serve as major ingredients, wherein the halogens may be a bromine simple substance or an iodine simple substance, the solvent is dimethylaniline or tetrafluoroethyl tetrafluoropropyl ether, and the catalyst is antimony pentafluoride; and reserving the pressure to between 0.05 and 0.6 MPa by using the olefins, heating to the temperature of between 150 and 230 DEG C, and reacting under the pressure of between 0.7 and 1.8 MPa for 3 to 8 hours, cooling to the temperature of between 30 and 40 DEG C, recovering unreacted raw materials, and rectifying under the reduced pressure to obtain a target product. In the method, the raw materials are readily available, and by-products are not generated; the process can be controlled, and the integral reaction process is stable and is easy and convenient to operate, so the method has the special advantage on a reaction process, and the product obtained finally has the purity of up to over 99.5 percent and yield of up to over 91 percent and can be used as the raw materials of fluorine-containing materials which are used for synthesizing fluororubber resistant to the temperature of between -50 and 260 DEG C and have stable chemical performance.

Description

technical field

[0001] The invention relates to a method for synthesizing halogenated alkanes. Background technique

[0002] Alkanes containing dibromine and diiodide have active agent groups that can react and can retain a bromine and iodine group at the same time, so they are widely used in technical fields such as special fluororubbers, fluorine-containing medicines, and fluorine-containing intermediates. Due to the small carbon-hydrogen bond energy of hydrocarbon alkane containing dibromine and diiodide, it does not have strong oil resistance, solvent resistance, weather resistance, high and low temperature resistance, etc., so its application is limited and cannot meet the rapid development of industry. Require. Contents of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for synthesizing halogenated alkanes with strong oil resistance, solvent resistance, weather resistance and high and low temperature resistan...