Process used for refining crude titanium tetrachloride and capable of prolonging production cycle

Abstract

The invention discloses a process used for refining crude titanium tetrachloride and capable of prolonging the production cycle. The process comprises the following steps: crude titanium tetrachloride and a vanadium-removing reagent as an organic matter are fed into a mixed-material feed system, then the obtained mixed materials is fed into a reactor and heated in the reactor by a heat source provided by a heating coil so as to complete the vanadium-removing process in the reactor; pure titanium tetrachloride steam is fed into a condenser, and after the pure titanium tetrachloride steam exchanges heat with circulating cooling water, the obtained steam enters a reflux accumulator, then part of the obtained steam as refluxed liquid is returned to a packed tower and then transported back to a reaction system, and the other part of the obtained steam is fed into an intermediate tank to detect, after passing the detection, this part of the obtained steam is fed into a finished-product storage tank, wherein in the process of refluxing, the reflux ratio is controlled at one second to one third; mud samples are taken out from the reactor every 6 to 8 hours so as to keep the solid-liquid ratio in the range of 30 to 60 percent; and the mud discharged from the reactor is transported to a molten salt chlorination system every 6 to 8 hours so as to recycle the titanium tetrachloride in themud. The process provided by the invention has the advantages that a production system can continuously and stably operate more than 24 months, thereby improving the production efficiency; and the titanium tetrachloride in the mud discharged from the reactor can be recycled, thereby reducing the production cost and reducing the environmental pollution.

Description

technical field [0001] The invention relates to a process for refining crude titanium tetrachloride which can prolong the production cycle. Background technique [0002] The existing crude titanium tetrachloride organic matter vanadium removal production technology is already at a mature stage in the world. It uses organic matter (salad oil, white mineral oil, etc.) After mixing for a certain period of time, it is sent to the reactor through the pipeline, and in the reactor, the heating coil immersed in the mixed liquid is supplied with high-pressure steam to make the titanium tetrachloride vaporize after reaching the vaporization temperature, and then After mass transfer and heat transfer in the packed tower, the finished product is cooled with circulating water in the tube heat exchanger, and the vanadium removal process of vanadium oxytrichloride is completed, so as to produce qualified vanadium-removed titanium tetrachloride. During the production process of this refini...

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Problems solved by technology

During the production process of this refining system, the outer wall of the heating coil immersed in the mixed mud is improperly operated (for example, the amount of mud discharged from the reactor is not effectively controlled during the operation, and the stirring is not continuous), and the scaling affects the heat transfer efficiency and consumes energy. If it is serious, it will cause the heating coil to lose its heat exchange capacity, and the reactor will be "paralyzed" without a heat source. The production has to be stopped and the heating coil will be removed for manual cleaning, which will waste time and effort and delay production.

In addition, the mud discharged from the reactor contains about 50% titanium tetrachloride, which makes it difficult to handle. It can only be stored in a fixed position and then washed with water. It pollutes the environment and loses a large amount of titanium tetrachloride, which seriously affects the output.

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