Preparation method of bromine hydride gas and generating device thereof

Abstract

The invention relates to a preparation method of bromine hydride gas and a generating device thereof in the field of medicaments, fine chemicals, chemical agents and the like. The preparation method of the bromine hydride gas is characterized by comprising the following steps of: selecting red phosphorus, concentrated hydrobromic acid and bromine according to the weight ratio of the red phosphorus to the concentrated hydrobromic acid to the bromine of 1:3.5-4.5:6-7; putting the red phosphorus and concentrated hydrobromic acid into a reaction vessel, stirring at the room temperature; dropping the bromine into a reactor from a constant pressure dropping liquid device; treating the generated bromine hydride gas in a bromine removing tower and a drying tower, namely leading out dried bromine hydride gas; and filtering kettle bottom solution in the reactor to remove unreacted red phosphorus, and depressurizing to remove the bromine hydride so as to obtain a byproduct of phosphorous acid. The preparation method has the advantages of low-price and readily-available raw materials, mild condition and simple device.

Description

technical field [0001] The invention relates to a method for preparing hydrogen bromide gas and a generating device thereof, which are applied in the fields of medicine, fine chemicals, chemical reagents and the like. Background technique [0002] Hydrogen bromide gas is widely used in medicine, fine chemicals, chemical reagents and other fields. At present, there are many methods for the preparation of hydrogen bromide gas, such as bromine-hydrogen combustion method, bromine-arene substitution method, bromine-red phosphorus wet method, hydrobromic acid-P 2 o 5 Dehydration method, potassium bromide-phosphoric acid co-heating method, phosphorus tribromide hydrolysis method, etc. However, these methods all have some defects. The bromine-hydrogen combustion method is to use bromine and hydrogen to burn to produce hydrogen bromide. This method has defects such as complicated devices, difficult gas separation, and hydrogen explosion hazard; the bromine-aromatic substitution met...

AI Technical Summary

Problems solved by technology

The bromine-hydrogen combustion method is a method of producing hydrogen bromide by burning bromine and hydrogen, which has defects such as complex devices, difficult gas separation, and the danger of hydrogen explosion easily; the bromine-aromatic substitution method uses bromine and hydrogen Toluene, xylene, tetrahydronaphthalene and other aromatic hydrocarbons undergo substitution reactions to release hydrogen bromide gas. This method has low bromine utilization rate (2 o 5 The dehydration method is to add 48% hydrobromic acid dropwise to anhydrous P 2 o 5 The method of releasing hydrogen bromide through dehydration in medium, the method exothermic violently, P 2 o 5 Defects such as large consumption and difficult large-scale preparation; the potassium bromide-phosphoric acid co-heating method is a method for generating hydrogen bromide gas by co-heating potassium bromide and concentrated phosphoric acid, which requires intense heating in actual operation, and bromide The generation of hydrogen is difficult; the phosphorus tribromide hydrolysis method is to add phosphorus tribromide dropwise to water or hydrobromic acid to generate hydrogen bromide by hydrolysis. This method has the disadvantages of easy hydrolysis of raw materials, expensive, difficult storage and transportation, etc. defect

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