KY-4D Alkaline Nitrogen Analyzer
| Brand | Keyuan Instruments |
|---|---|
| Origin | Jiangsu, China |
| Manufacturer Type | Direct Manufacturer |
| Region of Origin | Domestic (China) |
| Model | KY-4D |
| Instrument Type | Alkaline Nitrogen & Mercaptan Sulfur Analyzer |
| Application Scope | General-purpose petroleum product analysis |
| Measurement Range | ≥3 µg/g |
| Burette Resolution | 0.01 mL |
| Potentiometric Accuracy | ±0.1% F.S. |
| Potential Measurement Range | (0 to ±1999.5) mV |
Overview
The KY-4D Alkaline Nitrogen Analyzer is a fully automated potentiometric titrator engineered for precise quantification of alkaline nitrogen compounds in petroleum distillates, lubricating oils, and middle distillates. It operates on the principle of potentiometric endpoint detection during titration with standardized perchloric acid in glacial acetic acid medium—per ASTM D2597, SH/T 0162–1992, and ISO 8217 Annex D methodologies. The instrument integrates a high-stability dual high-impedance potentiometric input circuit, enabling reliable detection of subtle potential inflections associated with weak base neutralization. Designed specifically for compliance-driven laboratories, it delivers trace-level sensitivity (detection limit ≥3 µg/g), reproducible endpoint recognition without visual indicators, and robust performance under routine QC/QA workflows in refinery labs, third-party testing facilities, and R&D centers.
Key Features
- Fully automated titration sequence including auto-rinsing, reagent replenishment, fixed-volume dosing, and endpoint-driven termination—all coordinated via embedded control logic and Windows-based host software.
- Imported Swiss-made titration unit with low-noise stepper motor drive and ceramic piston burette, ensuring mechanical stability, long-term volumetric repeatability, and minimal maintenance over extended operation cycles.
- Dual high-impedance (>1013 Ω) electrode input channel architecture minimizes polarization drift and enhances signal-to-noise ratio during slow-titration kinetic profiles typical of weakly basic nitrogen species (e.g., pyridinic, quinolinic, and carbazolic compounds).
- Real-time titration curve smoothing and dynamic endpoint correction algorithm applied to first-derivative (ΔE/ΔV) and second-derivative (Δ²E/ΔV²) analysis—improving precision in complex matrices containing interfering heteroatoms or residual oxidation products.
- Comprehensive parameter configurability: customizable titrant concentration, sample mass/volume, pre-titration delay, stirring speed, and endpoint threshold—supporting method adaptation across feedstocks from naphtha to vacuum gas oil.
Sample Compatibility & Compliance
The KY-4D accepts liquid hydrocarbon samples within viscosity limits compatible with standard syringe aspiration (typically <50 cSt at 40 °C). Sample introduction is performed manually or via optional autosampler integration. The system conforms to SH/T 0162–1992 (Standard Test Method for Determination of Alkaline Nitrogen in Petroleum Products), supports alignment with ASTM D2597 (for alkylated aromatics), and facilitates traceable data generation compliant with GLP and GMP documentation requirements. All measurement records include timestamped metadata, operator ID, method version, and raw potential vs. volume datasets—enabling full audit trail reconstruction per FDA 21 CFR Part 11 principles when deployed with validated software configuration.
Software & Data Management
Controlled via native Windows application, the KY-4D software provides intuitive workflow navigation, multi-step method programming, and real-time graphical display of E–V curves. Data files are stored in encrypted binary format with optional export to CSV, PDF, or XML for LIMS integration. Each analysis generates a complete report containing sample ID, titrant consumption, calculated alkaline nitrogen content (mg N/kg or wt%), relative standard deviation (RSD), and digital signature fields. Built-in calibration verification tools allow periodic validation against certified reference materials (CRMs), while electronic signature support ensures analyst accountability and revision history tracking.
Applications
- Quantification of total alkaline nitrogen in crude assay fractions and hydrotreated streams to monitor catalyst poisoning potential.
- Quality control of jet fuel (ASTM D1655) and diesel (ASTM D975) for nitrogen-induced deposit formation risk assessment.
- Research into nitrogen speciation effects on combustion efficiency, NOx emissions, and particulate matter generation.
- Supporting refinery process optimization by correlating alkaline nitrogen levels with hydrodenitrogenation (HDN) conversion rates.
- Regulatory compliance testing for marine fuels under IMO 2020 sulfur cap frameworks where nitrogen co-contaminants affect scrubber sludge composition.
FAQ
What standards does the KY-4D comply with for alkaline nitrogen determination?
It is validated per SH/T 0162–1992 and supports method alignment with ASTM D2597 and ISO 8217 Annex D.
Can the instrument analyze solid or viscous samples?
No—it is designed exclusively for liquid hydrocarbon samples with kinematic viscosity ≤50 cSt at 40 °C; solids require prior dissolution in suitable solvents.
Is the system compatible with LIMS or ERP platforms?
Yes—via configurable CSV/XML export and optional OPC UA or ODBC connectivity modules (available as factory-installed options).
How is electrode drift compensated during prolonged analysis sessions?
Through continuous zero-point monitoring, automatic offset correction using internal reference voltage, and dual-electrode differential measurement mode.
Does the KY-4D support multi-point calibration for non-linear response ranges?
Yes—the software allows up to five-point calibration using standard solutions of known alkaline nitrogen concentration, with polynomial curve fitting enabled.
