In high-volume chloride-route titanium dioxide manufacturing, inline process filtration acts as a primary control point for product yield, production continuity, and overall plant profitability. Rather than serving as secondary pollution-control equipment on waste streams, rigid filter candles installed directly inside primary process loops isolate purified pigment particles and manage raw process streams under intense conditions.
Capturing fine particulates while maintaining stable fluid flow through chlorination reactors, calciners, and high-temperature oxidation loops requires filtration media built to withstand aggressive chemical atmospheres without structural degradation.
Engineered filter candle assemblies positioned within active process lines handle aggressive process gas volumes containing titanium tetrachloride, unreacted titanium-bearing ore solids, and hot chlorine gas. Operating continuously at temperatures ranging from 300°C to as much as 1000°C, these inline filter elements prevent product loss, protect downstream condenser columns from abrasive particulate carryover, and stabilize vessel differential pressure. When filter elements fail or blind prematurely, plants experience elevated back-pressure, reduced throughput, and expensive unscheduled unit shutdowns.
HAVER & BOECKER manufacturers POROSTAR® sintered wire mesh filter candles engineered specifically for demanding chloride-process titanium dioxide filtration environments. Constructed by diffusion-bonding precise layers of woven metal mesh under high heat and pressure, these rigid filter candles deliver fixed pore geometry, superior mechanical strength, and exceptional thermal shock resistance tailored to aggressive chlorine gas filtration applications.
In this article, created for chemical process engineers, plant operations managers, and reliability engineers tasked with optimizing inline hot gas filtration in chloride-route titanium dioxide facilities, we examine operational stressors in chloride production loops, evaluate alternative filter media, detail the functional performance of POROSTAR® sintered laminates, and identify scenario-based trade-offs to help plant leaders choose the right media structure for their process parameters.
The chloride production route subjects process equipment to a destructive combination of elevated thermal loss, severe halogen corrosion, and rapid pressure fluctuations.
Managing hot gas filtration within these reaction loops requires a detailed understanding of the mechanical and chemical stressors acting on internal components across each production phase, which include:
Chemical degradation presents a constant threat to media longevity in titanium tetrachloride reaction zones. At operating temperatures exceeding 300°C, dry chlorine gas rapidly attacks standard 300-series stainless steels, causing severe pitting, intergranular corrosion, and stress corrosion cracking.
To survive long-term exposure without structural thinning or wire degradation, high-temperature filter candles must utilize specialized high-nickel metallurgy such as Inconel or Hastelloy.
Furthermore, inline filter candles must endure violent mechanical stresses during cleaning cycles. To maintain continuous gas flow without bringing reactors offline, filtration systems utilize automated reverse pulse-jet backwashing.
Cold compressed gas blasts driven through the core of hot filter elements create intense thermal transients and mechanical vibration. Filtration media must possess sufficient ductility and physical integrity to absorb these repeated thermal-mechanical shocks without developing micro-cracks or suffering seam separation.
Achieving stable long-term operation in chloride-route titanium dioxide production requires selecting filter media capable of surviving both process gas chemistry and mechanical cleaning forces.
Comparing alternative filter constructions against actual field demands highlight key trade-offs in durability, maintenance frequency, and risk profile:
Having difficulty determining if your hot gas filter is degrading? Check out the article below to discover early signs to look out for and what you can do about it:
POROSTAR® sintered wire mesh filter candles manufactured by HAVER & BOECKER overcome the structural vulnerabilities of ceramics and powder metal through an advanced diffusion-bonded lamination process.
By combining multiple layers of precision-woven wire mesh, which include protective outer layers, fine filtration mesh, and heavy internal support weaves, it can be created into a solid unified structure, as sintered mesh candles deliver targeted operational benefits for chloride process lines:
Sustaining peak production rates and protecting operational margins in chloride-route titanium dioxide manufacturing requires hot gas filtration infrastructure designed for extreme operating realities. Replacing fragile ceramic elements or rapid-blinding depth media with high-performance sintered wire mesh filter candles allows plant operators to eliminate catastrophic element fractures, control differential pressure, and extend scheduled overhaul cycles.
Integrating high-integrity metallic filter candles downstream of chlorinators, calciners, and oxidation vessels stabilizes production loops, safeguards downstream capital equipment, and maximizes titanium dioxide product recovery. Combining corrosion-resistant alloy selection with surface-loading mesh geometry gives chemical processing plants a reliable path to continuous throughput and reduced maintenance overhead.
HAVER & BOECKER partners directly with process engineers, plant operations leaders, and original equipment manufacturers to engineer application-specific POROSTAR® sintered wire mesh filter candles. Custom-configured to match vessel dimensions, gas chemistry, and flow requirements, HAVER & BOECKER delivers robust hot gas filtration solutions backed by more than 135 years of technical wire weaving leadership.
Check out the article below to learn more about the differences between Sulfate and Chloride titanium dioxide processing and how wire mesh can benefit your process: