Titanium dioxide oxidation reactor adopting chlorination process
By designing an oxidation reactor with front and rear feeding cylinders, double utilization of heat is achieved, solving the problem of unutilized high heat in the existing technology, reducing the amount of rock salt used, and improving economic benefits and production capacity.
Patent Information
- Application Number
- CN202422607740.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-10-28
AI Technical Summary
Existing chloride-based titanium dioxide oxidation reactors fail to effectively utilize the high heat of the primary reaction, resulting in the need for a large amount of rock salt for rapid cooling, which increases costs and reduces economic benefits.
An oxidation reactor including front and rear feeding cylinders is designed. The heat of the primary reaction is used to heat the subsequent reactants through a two-stage oxidation reaction, thereby reducing the amount of rock salt required for quenching and cooling.
It achieves effective utilization of heat, reduces the demand for rock salt for sudden cooling, improves economic benefits and increases production capacity by about 30%.
Smart Images
Figure CN223381619U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an oxidation reactor, in particular to an oxidation reactor used for titanium dioxide produced by a chloride process. Background Art
[0002] The chloride process of titanium dioxide is a relatively advanced titanium dioxide production process. Its production process is short, highly automated, and relatively environmentally friendly. The products produced have better pigment properties than those produced by the sulfuric acid process.
[0003] The oxidation process is the core process of the chloride process for titanium dioxide production, and the oxidation reactor is the core equipment of the process. The existing oxidation reactor includes a gas pipe, a combustion chamber, a reaction tube and a cooling tube connected in sequence. A feeding tube is fixedly installed in the reaction tube, and a radial feeding port is provided on the reaction tube outside the feeding tube. The cooling tube is provided with a coolant inlet. During use, preheated oxygen is mixed with toluene and introduced into the combustion chamber through a gas pipe. The heat released by the combustion reheats the oxygen to 1400-1600°C. After passing through the feeding tube, the high-temperature oxygen is mixed with the preheated titanium tetrachloride gas introduced once through the feeding port, and an oxidation reaction occurs. The temperature of the reacted material is 1800-1900°C. Rock salt and desalted water are introduced through the coolant inlet to cool the high-temperature material to 200-300°C. The disadvantage of this device is that the high heat generated by the reaction of titanium tetrachloride and oxygen is not utilized. In order to achieve rapid cooling of the material, a large amount of rock salt needs to be introduced, which is costly and reduces economic benefits. Summary of the Invention
[0004] The purpose of the utility model is to provide a chloride process titanium dioxide oxidation reactor to address the deficiencies of the existing technology. The reactor can realize two reactions and utilize a large amount of reaction heat after the initial reaction, while saving the rock salt required for quenching and cooling, thereby reducing costs and improving economic benefits.
[0005] In order to achieve the above-mentioned purpose, the utility model provides a chloride process titanium dioxide oxidation reactor, comprising a gas pipe, a combustion chamber, and a front reaction tube connected in sequence, a front feeding tube fixedly provided in the front reaction tube through a partition, a radial front feeding port provided on the front reaction tube behind the partition, and a radial gap between the front feeding tube and the front reaction tube; the utility model is characterized in that: a rear end of the front reaction tube is fixedly connected to a rear feeding tube, a cavity between the front feeding tube and the front reaction tube is communicated with the inner cavity of the rear feeding tube; a rear reaction tube is fixedly connected to the outer middle part of the rear feeding tube, a gap is provided between the rear reaction tube and the radially inner rear feeding tube, a radial rear feeding port is provided on the rear reaction tube, a cooling pipe is connected to the rear end of the rear reaction tube, and the cavity between the rear reaction tube and the rear feeding tube is communicated with the inner cavity of the cooling pipe; a coolant addition port is provided on the cooling pipe;
[0006] When the utility model is used, preheated oxygen is mixed with toluene and then introduced into the combustion chamber through the gas pipe, a certain proportion of preheated titanium tetrachloride gas is introduced into the front feeding port, and non-preheated titanium tetrachloride liquid is introduced into the rear feeding port, so that a two-stage oxidation reaction occurs, wherein a large amount of reaction heat generated by the oxidation reaction in the front stage is used to heat the titanium tetrachloride liquid in the rear stage, and the residual heat in the reactor after the reaction is complete is small, thereby saving the rock salt required for rapid cooling, reducing costs, and improving economic benefits.
[0007] As a further improvement of the present invention, the inner diameter of the rear feeding cylinder is smaller than the inner diameter of the front feeding cylinder; this can reduce the injection speed of the gas and heat after the front-stage reaction, achieve full mixing and heat exchange between the gas and heat and the rear-stage titanium tetrachloride, and ensure the completion of the rear-stage oxidation reaction;
[0008] As a further improvement of the present invention, the front feeding cylinder and the front reaction cylinder, as well as the rear reaction cylinder and the rear feeding cylinder are all coaxially arranged; this facilitates uniform mixing of reactants and heat during the two-stage reaction;
[0009] In summary, the utility model can realize two reactions and utilize a large amount of reaction heat after the initial reaction, while saving the rock salt required for quenching and cooling, thereby reducing costs and improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is the front view of the embodiment of the present utility model. DETAILED DESCRIPTION
[0011] In order to more clearly understand the purpose, technical solutions and beneficial effects of the present invention, the present invention is further described below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following embodiments.
[0012] like Figure 1 As shown, a chloride process titanium dioxide oxidation reactor of this embodiment comprises a gas pipe 1, a combustion chamber 2, a front reaction cylinder 3 and a rear feeding cylinder 4 connected in sequence by flanges, a front feeding cylinder 8 is fixedly arranged in the front reaction cylinder 3 through a partition 7, a radial front feeding port 9 is provided on the front reaction cylinder 3 of the partition 7, the front feeding cylinder 8 and the front reaction cylinder 3 are provided with a gap in the radial direction, the inner diameter of the rear feeding cylinder 4 is smaller than the inner diameter of the front feeding cylinder 8; the cavity between the front feeding cylinder 8 and the front reaction cylinder 3 and the rear feeding cylinder 4 are connected. The inner cavity is connected; the rear reaction cylinder 5 is welded and fixedly connected to the middle part of the rear feeding cylinder 4, and the rear reaction cylinder 5 is set at a gap with the radial inner rear feeding cylinder 4. The rear reaction cylinder 5 is provided with a radial rear feeding port 10, and the rear end of the rear reaction cylinder 5 is connected to the cooling pipe 6 through a flange. The cavity between the rear reaction cylinder 5 and the rear feeding cylinder 4 is connected to the inner cavity of the cooling pipe 6; the cooling pipe 6 is provided with a coolant addition port 11; the front feeding cylinder 8 and the front reaction cylinder 3, the rear reaction cylinder 5 and the rear feeding cylinder 4 are all coaxially arranged;
[0013] When the utility model is used, the preheated oxygen is mixed with toluene and then sprayed into the combustion chamber through the gas pipe 1. The heat released by the combustion of toluene reheats the oxygen to 1400-1600°C. The front feeding port 9 introduces titanium tetrachloride gas preheated to 400-500°C and accounting for 70%, and the rear feeding port 10 introduces titanium tetrachloride liquid that is not preheated and accounting for 30%. The high-temperature oxygen first passes through the front feeding cylinder 8 and is evenly mixed with the titanium tetrachloride gas at its end to cause a front-end oxidation reaction. The generated titanium dioxide primary product and a large amount of reaction heat pass through the rear feeding cylinder 4. The reaction heat can preheat the titanium tetrachloride liquid. This part of the titanium tetrachloride and the high-temperature rich oxygen undergo a rear-end oxidation reaction in the front section of the cooling tube. After the reaction is complete, there is less residual heat in the reactor, which can save the rock salt introduced through the coolant feeding port 11. Similarly, the titanium dioxide primary product is quickly cooled and cooled, which can reduce costs. Without significantly modifying the device, the production capacity of titanium dioxide chloride is effectively increased by about 30%, thereby improving economic benefits.
[0014] The inner diameter of the rear feeding cylinder 4 is smaller than that of the front feeding cylinder 8, which can reduce the injection speed of the gas and heat after the front reaction. In addition, the front feeding cylinder 8 and the front reaction cylinder 3, and the rear reaction cylinder 5 and the rear feeding cylinder 4 are all coaxially arranged, thereby achieving sufficient mixing and heat exchange of the gas and heat with the rear-stage titanium tetrachloride, ensuring the completeness of the rear-stage oxidation reaction.
Claims
1. A chloride process titanium dioxide oxidation reactor, comprising a gas pipe, a combustion chamber, and a front reaction tube connected in sequence, wherein a front feeding tube is fixedly mounted in the front reaction tube via a partition, a radial front feeding port is provided on the front reaction tube behind the partition, and a radial gap is formed between the front feeding tube and the front reaction tube; characterized in that: The rear end of the front reaction tube is fixedly connected to the rear feeding tube, and the cavity between the front feeding tube and the front reaction tube is communicated with the inner cavity of the rear feeding tube; the rear reaction tube is fixedly connected to the outside of the middle of the rear feeding tube, and the rear reaction tube and the radially inner rear feeding tube are arranged with a gap, and a radial rear feeding port is provided on the rear reaction tube, and the rear end of the rear reaction tube is connected to a cooling pipe, and the cavity between the rear reaction tube and the rear feeding tube is communicated with the inner cavity of the cooling pipe; a coolant addition port is provided on the cooling pipe.
2. A chloride process titanium dioxide oxidation reactor according to claim 1, characterized in that: The inner diameter of the rear feeding cylinder is smaller than the inner diameter of the front feeding cylinder.
3. A chloride process titanium dioxide oxidation reactor according to claim 1 or 2, characterized in that: The front feeding cylinder and the front reaction cylinder, and the rear reaction cylinder and the rear feeding cylinder are all coaxially arranged.