Kyoyuan KY-200 Microcoulometric Sulfur and Chlorine Analyzer

Overview

The Kyoyuan KY-200 Microcoulometric Sulfur and Chlorine Analyzer is a dedicated electrochemical instrumentation platform engineered for precise, trace-level quantification of total sulfur and total chlorine in hydrocarbon-based samples using the microcoulometric titration principle. Based on Faraday’s law of electrolysis, the instrument thermally cracks samples in a high-temperature quartz combustion furnace under controlled oxygen/nitrogen atmosphere, converting all sulfur species to SO₂ and chlorine species to HCl. These gaseous analytes are swept into a dual-mode coulometric titration cell where electrogenerated iodine (for sulfur) or silver ions (for chlorine) react stoichiometrically with the target species. The charge consumed during electrolysis—measured in real time by high-resolution coulometry—is directly proportional to analyte mass, enabling accurate calculation of concentration without external calibration curves. Designed for compliance with internationally recognized petroleum and gas testing standards—including SH/T 0253–92 (light distillates), GB/T 11061–1997 (natural gas), and SH/T 0222–1992 (LPG)—the KY-200 delivers robust performance in QC laboratories requiring regulatory-grade data integrity.

Key Features

• Digital microcoulometric architecture with embedded microprocessor control and real-time feedback loop for bias voltage stabilization (0–500 mV range)
• High-temperature programmable furnace (ambient to 1000 °C) with ±5 °C thermal uniformity and intelligent air-cooling system featuring auto-start/stop fan logic
• Modular sample introduction: standard liquid autosampler included; optional solid sampler and gas sampling valve kits available for heterogeneous matrices
• Quartz pyrolysis tube variants—light-duty and heavy-duty configurations—optimized for volatile vs. refractory sample types
• Integrated coulometric titration cell with dual-electrode design (generator and indicator), corrosion-resistant materials, and low-drift reference electrode
• Full computer integration via RS-232 or USB interface; software supports method setup, real-time signal monitoring, peak integration, and audit-ready reporting

Sample Compatibility & Compliance

The KY-200 accommodates liquid fuels (gasoline, diesel, jet fuel), liquefied petroleum gas (LPG), natural gas condensates, solid catalysts, and polymer additives—provided appropriate sample introduction hardware is selected. All operational protocols align with ASTM D3229 (equivalent to SH/T 0253), ISO 10859 (microcoulometric sulfur in light hydrocarbons), and relevant clauses of USP and EP 2.2.42 for halogen quantification. System validation documentation supports GLP and GMP environments; raw coulometric current traces, furnace temperature logs, and reagent consumption records are timestamped and stored with user-accessible metadata. Data export complies with LIMS-compatible CSV and XML formats; electronic signatures and 21 CFR Part 11–compliant audit trails are supported through optional software modules.

Software & Data Management

The proprietary Kyoyuan Analyzer Control Suite (KACS) provides a Windows-based interface for method development, sequence programming, and post-run evaluation. It captures raw current-time profiles, calculates integrated charge (in coulombs), applies Faraday-based mass conversion (using atomic weights of S = 32.06 g/mol and Cl = 35.45 g/mol), and reports results in mg/L, ppm, or wt%. Each analysis generates a structured data file containing instrument parameters (bias voltage, furnace setpoint, gas flow rates), diagnostic flags (e.g., baseline drift, cell contamination alerts), and operator-defined annotations. Reports include calibration verification logs, system suitability test summaries, and statistical summaries (mean, SD, RSD) across replicate injections. Data backups adhere to ICH M7 and ISO/IEC 17025 archival requirements.

Applications

• Refinery QC: Monitoring sulfur removal efficiency in hydrotreating units and verifying product compliance with Euro 5/6, Tier 3, and IMO 2020 marine fuel specifications
• Petrochemical R&D: Quantifying sulfur poisoning thresholds in FCC catalysts and evaluating chlorine content in polyolefin feedstocks
• Environmental labs: Measuring total sulfur in biofuels per EN 14078 and determining organochlorine residues in waste oils
• Contract testing facilities: Supporting API RP 4290, ASTM D5453, and ISO 20846 workflows with documented chain-of-custody integration
• Academic research: Studying reaction kinetics of sulfur oxidation pathways and validating novel desulfurization catalysts

FAQ

What detection principle does the KY-200 employ?
It uses microcoulometric titration based on Faraday’s law, measuring the electric charge required to generate titrant (I₂ for sulfur, Ag⁺ for chlorine) that reacts stoichiometrically with analyte gases.
Can the same system analyze both sulfur and chlorine?
Yes—the instrument operates in dual-mode configuration; users select the analytical mode (S or Cl) via software, and the system automatically configures electrode polarity, titrant chemistry, and calibration constants.
Is the KY-200 compliant with FDA or pharmaceutical regulations?
While primarily designed for petrochemical applications, its data integrity features (audit trail, electronic signatures, secure user access) support validation under 21 CFR Part 11 when deployed in pharmaceutical excipient or solvent testing workflows.
What maintenance is required for long-term stability?
Routine maintenance includes quarterly cell electrolyte replacement, annual quartz tube inspection/replacement, biweekly gas filter changes, and daily baseline verification using certified sulfur standards (e.g., dibenzothiophene in xylene).
How is system suitability verified before sample analysis?
System suitability tests include repeatability checks using mid-range reference standards (e.g., 10 mg/L S), bias voltage stability assessment (<±2 mV drift over 30 min), and recovery validation (95–105% for spiked matrix samples).