ailored to your industry, wastewater composition and treatment needs, Conqinphi offers one-stop customized evaporation solutions—from design, manufacturing to ...
The recovery of potassium bromide from industrial wastewater presents a dual challenge: achieving high-purity crystallization while managing concentrated mother liquor that would otherwise become a disposal liability. For a specialty chemical manufacturer in Southeast Asia, the existing potassium bromide triple-effect evaporator had reached its thermal and crystallization limits. The plant needed not just more throughput, but a complete mother liquor treatment evaporation crystallization system that would close the recovery loop and eliminate liquid waste discharge. CONQINPHI delivered an integrated solution that raised hourly processing capacity to 5 tons while converting what was once waste stream into a second revenue stream.
When the project began, the facility operated a standalone potassium bromide evaporator crystallizer with no downstream mother liquor handling. Operators were forced to batch-discharge concentrated brine to third-party treatment facilities at significant cost. Rising feed volumes—driven by expanded bromination capacity—meant this approach was economically unsustainable. The plant required a potassium bromide mother liquor evaporation crystallization system that could process the full production spectrum, from dilute wash waters to final purge streams, without cross-contaminating the primary product line.
The existing triple-effect evaporator was a falling-film unit with a rated capacity of 3.8 TPH. To reach the target 5 TPH, CONQINPHI’s thermal engineers recalculated the vapor-liquid equilibrium curves for potassium bromide solutions across the full concentration range. Key modifications included:
• Enlarged second-effect heating surface (316L stainless steel tubes, expanded from 180 m² to 240 m²) to handle the increased vapor load
• Redesigned vapor ducting to reduce pressure drop between effects, improving overall temperature differential utilization
• Upgraded vacuum system with a two-stage steam ejector and surface condenser, stabilizing operating pressure at 12 kPa absolute in the final effect
Post-commissioning tests confirmed the potassium bromide triple-effect evaporator consistently achieved 5.2 TPH feed rate at 48% inlet concentration, with steam economy holding at 0.33 kg steam per kg evaporated water.
The more innovative component was the mother liquor treatment evaporation crystallization system. Primary crystallizer purge—containing 28–32% potassium bromide, organic impurities, and trace heavy metals—was routed to a dedicated forced-circulation crystallizer operating at elevated temperature (105°C) to exploit the inverse solubility characteristics of certain contaminant salts.
Key design features of this potassium bromide mother liquor evaporation crystallization system:
• Two-stage impurity rejection: Hot filtration removed precipitated organics before cooling crystallization, protecting downstream centrifuge surfaces
• Controlled cooling profile from 105°C to 35°C over 4 hours, producing technical-grade potassium bromide crystals (97.5% purity) suitable for non-pharma applications
• Final concentrate dryer reducing residual moisture to <0.5%, producing a dry salt cake for industrial resale
The mother liquor treatment evaporation crystallization system achieved 89% additional potassium bromide recovery from what was previously waste, cutting third-party disposal costs by 94%.
Both the primary triple-effect evaporator and the mother liquor treatment evaporation crystallization system operate under a single distributed control system. Shared trending allows operators to correlate primary effect performance with mother liquor generation rates, enabling predictive adjustments. Key automated sequences include:
• Feed-forward density control adjusting steam flow based on inlet concentration measurements
• Crystal size monitoring via inline turbidity sensors, triggering fines dissolution cycles when needed
• Interlock protection preventing mother liquor transfer when primary crystallizer purity is below specification
Parameter | Design Target | Actual Performance |
Primary system feed rate | 5.0 TPH | 5.2 TPH |
Primary crystal purity | ≥99.0% | 99.3% |
Mother liquor recovery rate | ≥85% | 89% |
Overall liquid waste discharge | <5% of feed | 3.2% |
Annual operating hours | 7,000 | 7,200 (planned) |
The combined potassium bromide evaporator crystallizer and mother liquor system eliminated the plant’s single largest environmental compliance risk while adding approximately 380 tons per year of recoverable product.
CONQINPHI maintains fully equipped manufacturing at Xinyang, Henan and Jiaozhou, Qingdao. The Xinyang facility handles large-diameter pressure vessels, titanium-clad heating chambers, and structural skids up to 80 tons per unit. Jiaozhou specializes in precision crystallizer internals, automated valve manifolds, and control panel integration. This dual-base model allows parallel fabrication of major subsystems, compressing delivery schedules by 25–30% compared to single-site suppliers.
Every potassium bromide triple-effect evaporator and mother liquor treatment evaporation crystallization system from CONQINPHI is engineered to client-specific feed chemistry and utility conditions. Our thermal design group runs proprietary simulation software to optimize effect count, heating surface distribution, and crystallizer retention time before any metal is cut. We provide full OEM and ODM services, including branded documentation, customized HMI graphics, and region-specific electrical standards.
CONQINPHI has delivered evaporation and crystallization equipment to over 30 countries outside the EU, with active projects in Indonesia, Vietnam, Turkey, Egypt, Nigeria, Brazil, and Mexico. Our logistics team manages oversized vessel shipping, customs clearance for pressure equipment, and on-site supervision for triple-effect evaporator installation. Remote commissioning support via secure VPN connection reduces mobilization costs and accelerates startup timelines.
Whether you need a new potassium bromide evaporator crystallizer, a mother liquor treatment evaporation crystallization system, or an integrated upgrade to an existing train, CONQINPHI provides feasibility studies with guaranteed performance parameters.
Submit your feed analysis and capacity requirements—our engineers will return a preliminary heat-and-mass balance, equipment layout proposal, and fixed budget estimate within five business days.
No. 81, Fengfei Road, Beiguan Industrial Park, Jiaozhou City, Qingdao Province, China
Copyright © 2025 Qingdao Conqinphi Environmental Technology Group Co., Ltd.All Rights Reserved.
