how to purify the hydrogen chloride gas in fluorine chemical industry

Due to the vigorous development of fluorine chemical industry, the production process of hydrogen chloride gas usually adopt the method of water absorption, produce a large amount of hydrochloric acid, gradually caused imbalance between supply and demand, the excess of by-product hydrochloric acid (contain a certain amount of fluoride or organic matter) cannot be digested by the market, gain no for fluorine chemical industry factory.

Now, how to purify the hydrogen chloride gas in this industry?

Fluorine chemical industry by - product hydrogen chloride main purification object is trace hydrogen fluoride, namely defluorination.

First, dry defluorination

At present, the common dry defluorination method is alumina adsorption defluorination. The disadvantage of this method is that it is suitable for anhydrous hydrogen chloride gas with low hydrogen fluoride content, and alumina defluorination agent can not be regenerated after use, which will produce solid waste.

Second, wet defluorination

Boric acid solution absorption method is one of the methods for defluorination of hydrochloric acid wet gas. A certain amount of boric acid solution is integrated into 35% hydrochloric acid liquid, and the hydrochloric acid wet gas that needs to be defluorinated is passed through under constant temperature and pressure. The obtained solution is recycled after silica gel adsorption and defluorination regeneration.

Either way, the hydrogen chloride gas has less than 10 times 10 to the minus 6 fluorine.

The byproduct of hydrogen chloride gas can be used as raw materials for many chemical products, in addition, can also be used for the synthesis of vinyl chloride, methane chloride, trichlorosilane and so on.
Rational use of fluorine chemical byproduct hydrogen chloride purification technology, not only reduce environmental pollution, reduce the cost of enterprise governance, but also create additional income, is a field worthy of study for relevant enterprises.