Synthetic method for improving synthesis efficiency and reducing unit consumption in production process of lithium hexafluorophosphate

Abstract

The invention discloses a synthetic method for improving synthesis efficiency and reducing unit consumption in a production process of lithium hexafluorophosphate. The synthetic method comprises the following steps: (1) gasifying hydrogen fluoride into gas; (2) converting gaseous hydrogen fluoride into liquid; (3) dropwise adding the liquid hydrogen fluoride into a reaction tank loaded with phosphorus pentachloride; (4) carrying out adjoining pipe cooling on mixed gas obtained by reaction in step (3), and then feeding the mixed gas into a reactor; (5) carrying out a synthetic reaction processin the synthetic reactor by a high-pressure liquid vacuum gas suction efficient mixing mode; (6) feeding tail gas discharged from the synthetic reactor into an absorption reactor; and (7) cooling thetail gas discharged from the absorption reactor by a condenser before washing and absorption treatment. The synthesis efficiency of the lithium hexafluorophosphate can be improved, and the unit consumption is reduced effectively.

Description

technical field [0001] The invention relates to a synthesis process of lithium hexafluorophosphate, in particular to a synthesis method for improving synthesis efficiency and reducing unit consumption in the production process of lithium hexafluorophosphate. Background technique [0002] The main steps of the current lithium hexafluorophosphate production process are as follows: the mixed gas after the reaction of hydrogen fluoride gas and phosphorus pentachloride solid is inserted into the liquid phase of lithium fluoride-anhydrous hydrogen fluoride mother liquid through the phosphorus pentafluoride inlet pipe to mix the materials and react. There are disadvantages in this method: 1) During the reaction process of hydrogen fluoride gas and phosphorus pentachloride solid, a large amount of hydrogen fluoride gas will be discharged along with phosphorus pentafluoride gas; 2) The gas insertion tube in the synthesis reaction kettle is directly inserted. In the later stage, the i...

AI Technical Summary

Problems solved by technology

There are disadvantages in this method: 1) During the reaction process of hydrogen fluoride gas and phosphorus pentachloride solid, a large amount of hydrogen fluoride gas will be discharged along with phosphorus pentafluoride gas; 2) The gas insertion tube in the synthesis reaction kettle is directly inserted. In the later stage, the insertion tube will be blocked, reflecting the high pressure in the intake pipe; if the insertion is too shallow, the phosphorus pentafluoride gas will leave the liquid phase and enter the exhaust system before the reaction is complete, resulting in excessive consumption of raw materials and increasing the exhaust gas system. Th