Chemical reaction apparatus and chemical reaction method for removing vanadium from crude TiCl4

Abstract

The invention discloses a chemical reaction apparatus for removing vanadium from crude TiCl4. The chemical reaction apparatus comprises, in a successively connected manner, a mixing reactor (6), a flash tank (7), a float valve column (11), a cooler (12), and a reflux tank (13), and also includes a crude TiCl4 storage tank (2), a secondary reactor (8), a double tube-sheet heat exchanger (9), a white oil storage tank (1), a metering pump (3), a flow meter (5), and a vanadium-removed TiCl4 storage tank (17). The invention is direct at a conventional technology of using mineral oil to remove the vanadium from crude TiCl4, wherein the crude TiCl4 heated by the double tube-sheet heat exchanger and precisely metered white oil are uniformly mixed according to ratio in the mixer, so that the two components are rapidly reacted in the mixer to remove the vanadium; the mixture then is fed into the flash tank to perform flash; and the TiCl4, with a VOCl3 impurity being removed, is fed into the high-boiling-point impurity removing float valve column in the form of vapor to further remove high-boiling-point impurities in the TiCl4; and the TiCl4 is cooled to produce a TiCl4 inter-product. The method solves the problems of poor quality stability and high energy consumption in a conventional TiCl4 vanadium removal process, has simple device arrangement and stable process control, and is high in vanadium removal efficiency.

Description

technical field [0001] The invention relates to the field of refining titanium tetrachloride, in particular to a chemical reaction device and method for removing vanadium from crude titanium tetrachloride. Background technique [0002] Titanium tetrachloride is the main raw material for the production of titanium sponge and the production of titanium dioxide by the chlorination method, and it is also an important material for the production of pigments and titanium organic compounds. Crude titanium tetrachloride refers to unpurified titanium tetrachloride. There are many harmful impurities in crude titanium tetrachloride, among which vanadium is the main impurity element. The existence of vanadium impurities directly affects the quality of sponge titanium and titanium dioxide. The efficient and rapid removal of vanadium impurities has always been the field of titanium tetrachloride refining. problem. The vanadium impurity in crude titanium tetrachloride is mainly vanadiu...

AI Technical Summary

Problems solved by technology

However, the traditional mineral oil vanadium removal process is mainly carried out in the distillation still, which is heated by steam heating on the outer wall of the still or an electric heater. The heat conduction efficiency is low, the energy consumption is high, and the vanadium removal reaction is prone to interruption; mineral oil consumption A large amount of vanadium slag is produced, and the residue is prone to scarring on the walls and official roads, blocking the pipeline, and with the fluctuation of the amount of vanadium slag in the still, the efficiency of vanadium removal in the still fluctuates, affecting the refined tetrachloride. Quality stability of titanium dioxide

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