Fluidized Bed Reactor Silica Control via Silicon Tetrachloride Feedback
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Solution Overview
Problem
The existing processes for manufacturing titanium tetrachloride in fluidized bed reactors struggle to control excess silicon tetrachloride and silica contamination, which affects the quality parameters of titanium dioxide products such as particle size distribution and primary particle size.
Innovation Solution
A control process that analyzes the concentration of silicon tetrachloride in the gaseous stream and adjusts the flow of titanium-bearing material into the reactor based on a set point concentration, using feedback signals to maintain desired silica levels in the final product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If titanium bearing material is fed into the fluidized bed reactor for chlorination, then titanium tetrachloride is produced, but silicon tetrachloride and silica contamination occur in the product
Solution Approach 1:
The patent implements a feedback control system that continuously monitors silicon tetrachloride concentration in the gaseous stream using an analyzer. The measured concentration is fed back to a controller that adjusts the titanium bearing material feed rate accordingly, maintaining silicon content within specified limits while maximizing titanium tetrachloride production.
Solution Approach 2:
The patent changes the operational parameter of titanium bearing material feed rate dynamically based on real-time silicon tetrachloride measurements. By adjusting this parameter through feedback control, the system maintains optimal production while preventing excessive silica contamination in the final titanium dioxide product.
2Manufacturing precision
If excess silicon tetrachloride is present in the gaseous stream, then silica contamination increases in the final product, but controlling it requires adjusting the titanium bearing material flow
Solution Approach 1:
The system uses an analyzer to continuously measure silicon tetrachloride concentration in the gaseous stream and feeds this information back to a controller. The controller automatically adjusts the titanium bearing material feed rate to maintain silicon content within the desired range, achieving precise control without manual intervention.
Solution Approach 2:
The patent replaces manual mechanical adjustment of titanium bearing material flow with an automated control system that uses sensors, analyzers, and electronic controllers. This substitution enables more precise and consistent silica content control while reducing operational complexity through automation.
3Productivity
If the titanium bearing material flow is increased to maintain production levels, then silica contamination increases, but reducing it lowers productivity
Solution Approach 1:
The feedback control system continuously monitors silicon tetrachloride concentration and automatically adjusts the titanium bearing material feed rate. This enables the system to maintain high productivity by optimizing the feed rate in real-time, preventing silica contamination without sacrificing production volume.
Solution Approach 2:
The patent implements dynamic adjustment of the titanium bearing material feed rate based on real-time silicon tetrachloride measurements. Rather than using a fixed feed rate, the system continuously adapts the feed rate to maintain optimal production while controlling silica contamination, balancing productivity with product quality.
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 process effectively reduces silica contamination in titanium dioxide products, improving their quality by maintaining low silica concentrations and reducing variability in particle size distribution and primary particle size.
Implementation Method 1
The process for chlorinating titanium containing materials in a fluidized bed reactor is known
Implementation Method 2
condensing the gaseous stream to form titanium tetrachloride, a non-condensed gas stream and a condensable product stream
Data Source
Figure 1
AI summary
This disclosure relates to a process for controlling chlorination reactions in manufacturing titanium tetrachloride in a fluidized bed reactor, optionally followed by processing to form a titanium product comprising an amount of silica, the process comprising: (a) feeding carbonaceous material, titanium bearing material comprising an amount of silica, and chlorine to the fluidized bed reactor to form a gaseous stream, and condensing the gaseous stream to form titanium tetrachloride, a non-condensed gas stream and a condensable product stream, wherein at least one of the titanium tetrachloride and the non-condensed gas stream comprise silicon tetrachloride; (b) analyzing the non-condensed gas stream, the titanium tetrachloride or both, to determine the analyzed concentration of silicon tetrachloride; (c) identifying a set point concentration of silicon tetrachloride based on the desired amount of silica in the titanium product; (d) calculating the difference between the analyzed concentration of silicon tetrachloride and the set point concentration of silicon tetrachloride; and (e) generating a signal which corresponds to the difference calculated in step (d) which provides a feedback response that controls the flow of the titanium bearing material into the fluidized bed reactor.