Titanium Dioxide Process Control for Chloride Removal
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Solution Overview
Problem
The chloride process for producing titanium dioxide pigment faces issues such as 'bag filter blinding', blower fouling, and poor acid solubility due to the presence of titanium tetrachloride, which can lead to inefficient processing and product quality problems if not managed properly, and temperature control is critical for effective silicon tetrachloride reaction but often results in fragile or incomplete encapsulation.
Innovation Solution
A process that integrates an analyzer to monitor and control the concentrations of titanium tetrachloride and silicon tetrachloride in real-time, adjusting oxidation and reaction conditions to maintain optimal levels, ensuring complete conversion of titanium tetrachloride and effective encapsulation of titanium dioxide with silicon tetrachloride, thereby preventing processing issues and enhancing product durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If excessive heat is used during oxidation to avoid titanium tetrachloride in the product stream, then the presence of titanium tetrachloride is reduced, but energy consumption increases
Solution Approach 1:
The patent employs real-time monitoring of titanium tetrachloride concentrations in the product stream and uses this feedback information to dynamically adjust oxidation conditions, allowing optimization of energy consumption while maintaining acceptable levels of titanium tetrachloride removal
Solution Approach 2:
The patent changes oxidation parameters (temperature, residence time, oxygen flow rate) to find the optimal balance between titanium tetrachloride conversion and energy consumption, moving away from the conventional approach of using excessive heat
2Quantity of substance
If the temperature is too low during silicon tetrachloride contacting, then silicon tetrachloride remains unreacted, but if the temperature is too high, the encapsulation layer becomes fragile or incomplete
Solution Approach 1:
The patent uses dynamic temperature control during the silicon tetrachloride contacting step, adjusting the temperature profile in real-time based on process conditions to maintain optimal reaction temperature without exceeding the threshold that causes encapsulation layer degradation
Solution Approach 2:
The patent employs periodic or staged temperature adjustment during the encapsulation process, using multiple temperature zones or sequential heating stages to ensure complete reaction while protecting encapsulation quality
3Reliability
If titanium tetrachloride is present in the product stream, then processing problems occur such as bag filter blinding and blower fouling, but removing it completely requires excessive heat
Solution Approach 1:
The patent implements real-time monitoring of titanium tetrachloride levels and uses this feedback to adjust oxidation conditions, achieving reliable processing by maintaining titanium tetrachloride below problematic thresholds without the energy waste of excessive heating
Solution Approach 2:
The patent optimizes oxidation parameters (temperature, residence time, oxygen flow) to achieve the minimum effective conversion of titanium tetrachloride needed to prevent processing problems, rather than using excessive heat
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach optimizes the production of durable titanium dioxide pigment by minimizing unreacted chlorides, reducing energy consumption, and ensuring complete encapsulation, resulting in a product suitable for exterior coatings with improved acid solubility and reduced operational inefficiencies.
Implementation Method 1
analyzing the process stream to detect a concentration of silicon tetrachloride
Implementation Method 2
analyzing the process stream to detect a concentration of titanium tetrachloride
Implementation Method 3
reacting titanium tetrachloride with oxygen by contacting the titanium tetrachloride with the oxygen in an oxidation reactor under oxidation conditions to form a gaseous product stream containing titanium dioxide
Implementation Method 4
contacting the gaseous product stream with silicon tetrachloride under conditions effective for treating the titanium dioxide with a silicon-containing compound to form a treated product stream
Data Source
AI summary
The disclosure relates to a process for making titanium dioxide, comprising: (a) reacting titanium tetrachloride with oxygen by contacting the titanium tetrachloride with the oxygen in an oxidation reactor under oxidation conditions to form a gaseous product stream containing titanium dioxide; (b) contacting the gaseous product stream with silicon tetrachloride under conditions effective for treating the titanium dioxide with a silicon-containing compound to form a treated product stream; (c) separating the treated titanium dioxide from the treated product stream to form a process stream; (d) analyzing the process stream to detect a concentration of silicon tetrachloride; (e) comparing the concentration of silicon tetrachloride detected in the process stream to a silicon tetrachloride aim point concentration; and (g) modifying the conditions for contacting the gaseous product stream with silicon tetrachloride to restore or maintain the concentration of silicon tetrachloride in the process stream at the silicon tetrachloride aim point.