Binzhenghong SCH-I Sub-Boiling Acid Purifier (1000 mL Capacity)

Overview

The Binzhenghong SCH-I Sub-Boiling Acid Purifier is an engineered solution for the preparation of ultra-trace metal-free acids essential in high-sensitivity analytical applications—including ICP-MS, ICP-OES, HR-ICP-MS, and semiconductor-grade etchant formulation. Operating on the principle of sub-boiling (or near-boiling) distillation, the system maintains the acid solution just below its atmospheric boiling point—minimizing volatilization of non-volatile metallic contaminants while enabling selective vapor-phase transfer of purified acid vapors. This thermodynamically controlled separation mechanism ensures consistent removal of cationic impurities such as Fe, Al, Cr, Ni, Cu, Zn, Pb, and rare earth elements without introducing leachables from metallic or glass components. The unit is specifically designed for laboratory environments requiring compliance with stringent purity standards for reagent-grade acids used in calibration, standard preparation, and blank minimization.

Key Features

• Full PFA-wetted path: All fluid-contact surfaces—including evaporator chamber, condenser coil, transfer tubing, and collection vessel—are fabricated from high-purity, ASTM D4897-compliant perfluoroalkoxy alkane (PFA), eliminating metal ion leaching and ensuring compatibility with aggressive media including HF, HNO₃, HCl, and ultrapure water.
• Monolithic thermal architecture: Evaporator and condenser are integrally heat-fused into a single, seamless PFA assembly—eliminating gasketed joints, threaded interfaces, or O-ring seals that may compromise purity or introduce failure points.
• PID-controlled silicone rubber heating jacket: Provides uniform, low-gradient thermal input with ±1 °C stability across operating ranges; programmable setpoints accommodate temperature-sensitive acids (e.g., HF at ~110 °C, HNO₃ at ~120 °C).
• Dry-run and overtemperature protection: Integrated thermal cutoffs automatically de-energize the heater if liquid level falls below minimum threshold or surface temperature exceeds safe operational limits—enabling unattended operation inside fume hoods under GLP-compliant conditions.
• Ambient-air condensation design: Eliminates need for external chilled water circuits, reducing infrastructure dependency and avoiding potential contamination from recirculated coolant systems.
• Calibrated volumetric feed funnel: Features engraved 200/600/1000 mL markings for precise charge volume control; GL45-threaded PFA collection bottle ensures leak-tight sealing without secondary caps or liners.

Sample Compatibility & Compliance

The SCH-I supports purification of hydrochloric acid (HCl), nitric acid (HNO₃), hydrofluoric acid (HF), and deionized water—each requiring distinct sub-boiling temperature profiles to optimize volatility differential between target acid and contaminant species. It meets material compatibility requirements defined in ASTM D1193 (Type I water), USP (conductivity specification), and ISO 3696 (Grade 1 water). While not certified to ISO 15195 or ISO/IEC 17025 as a standalone instrument, its design enables laboratories to demonstrate traceability and procedural control when integrated into validated acid purification SOPs aligned with ICH Q5, FDA 21 CFR Part 11 (when paired with compliant data logging), and CNAS-CL01:2018 documentation frameworks.

Software & Data Management

The SCH-I operates as a stand-alone hardware platform with no embedded firmware or digital connectivity. Temperature setpoint, real-time display, and status indicators are managed via a front-panel LCD interface with PID controller logic. For audit readiness, users are advised to record operational parameters—including batch number, acid type, initial volume, set temperature, runtime, and final collected volume—in a secure, version-controlled electronic lab notebook (ELN) or paper-based logbook meeting GLP/GMP documentation standards. Optional external USB data loggers (not included) may be interfaced with the analog temperature output signal for time-stamped traceability.

Applications

• Preparation of matrix-matched calibration standards for multi-element ICP-MS quantification in environmental, clinical, and geochemical labs.
• Generation of ultra-low-background acids for digestion of high-purity reference materials (e.g., NIST SRM 2710a, BCR-680).
• Production of etchants and cleaning solutions in microelectronics fabrication where Na⁺, K⁺, and transition metal residuals must remain below 0.1 ppt.
• Blank reduction in hydride generation-AAS (HG-AAS) and cold vapor AFS for As, Se, Sb, and Hg analysis.
• Supporting ISO 17025 accreditation by enabling documented, repeatable acid purification protocols with measurable impurity reduction performance (10 ppb → 0.01 ppb typical).

FAQ

Can the SCH-I purify mixed acid solutions (e.g., HNO₃/HF blends)?
No. The system is engineered for single-acid batches only to prevent cross-contamination and ensure reproducible thermal profiles. Mixed acid purification requires dedicated, chemically resistant equipment with multi-zone temperature control—not supported by this model.
Is the PFA collection bottle autoclavable?
Yes—high-purity PFA bottles withstand repeated autoclaving at 121 °C, 15 psi for 20 minutes without deformation or extractable release, per ASTM F2477 testing guidelines.
What maintenance is required?
No routine maintenance beyond periodic visual inspection of the PFA chamber for residue buildup and verification of valve actuation. The absence of moving parts, gaskets, or cooling pumps results in minimal scheduled upkeep.
Does the unit comply with CE or UL safety standards?
It carries CCC (China Compulsory Certification) marking for domestic use. For export markets, third-party certification (e.g., CE, UL 61010-1) may be obtained upon request through Binzhenghong’s OEM compliance support channel.
How is traceability ensured during operation?
Traceability relies on user-generated records: operator ID, date/time stamp, acid lot number, pre- and post-purification ICP-MS screening data, and instrument parameter logs—all maintained per ISO/IEC 17025 clause 7.5.2 requirements for measurement traceability.