CoMetro CP-LDI High-Pressure Constant Flow Pump for Hydrogenation Catalyst Evaluation Systems

Overview

The CoMetro CP-LDI High-Pressure Constant Flow Pump is an engineered solution for precise, stable, and reproducible liquid delivery in catalytic reaction evaluation—particularly in fixed-bed or trickle-bed hydrogenation catalyst testing systems operating under elevated pressure and temperature conditions. Designed around a dual-plunger, parallel-flow architecture, the CP-LDI employs a closed-loop electronic control system integrating brushless DC motor drive, real-time pressure transduction, and adaptive compressibility compensation to maintain volumetric flow integrity across variable backpressures up to 600 psi (41.4 bar). Its robust mechanical design—including suspended pump head assembly, sapphire-hardened check valves, and chemically resistant fluidic pathways—ensures long-term stability in continuous operation with organic solvents, aqueous buffers, and corrosive reagent mixtures common in hydrotreating, hydrodesulfurization (HDS), and hydrogenolysis studies.

Key Features

• Dual parallel plunger heads enabling true constant-flow delivery with minimized pulsation (<±0.1% RSD) and high-pressure resilience (rated to 600 psi, with optional configurations up to 6000 psi)
• Intelligent electronic control core featuring real-time pressure monitoring, programmable high/low pressure limits, and dynamic compressibility correction for accurate flow under compressible mobile phases
• User-configurable pressure units (PSI, MPa, bar) and flexible control interfaces: local keypad, PC-based software via RS-232/USB, or external analog signal (0–5 V / 4–20 mA)
• Integrated solvent purge and automated column wash routines—especially critical when using phosphate or ammonium-based buffers to prevent crystallization and seal degradation
• Modular scalability: multiple CP-LDI units (2–4) can be synchronized for binary or quaternary gradient elution in multi-feed catalytic screening or kinetic mapping experiments
• High-brightness LED display with remote-readable contrast, supporting simultaneous monitoring of flow rate (0.001–12 mL/min standard range), actual system pressure, and operational status flags

Sample Compatibility & Compliance

The CP-LDI is compatible with a broad spectrum of process liquids used in heterogeneous catalysis evaluation—including aliphatic/aromatic hydrocarbons, alcohols, water–organic mixtures, and low-concentration acidic or basic aqueous solutions. All wetted parts are constructed from 316 stainless steel, sapphire, and PEEK, ensuring resistance to chloride-induced stress corrosion cracking and compatibility with ASTM D6300-compliant fuel simulants. The pump meets general laboratory safety standards per IEC 61010-1 and supports GLP-compliant operation through audit-trail-enabled software logging (when paired with CoMetro’s optional ChromaControl Suite). While not intrinsically rated for Class I Div 1 hazardous areas, it is routinely deployed in ventilated fume hoods or gas-tight reactor enclosures compliant with NFPA 55 and OSHA 1910.119 process safety management requirements.

Software & Data Management

When operated via PC interface, the CP-LDI integrates with CoMetro’s ChromaControl Suite—a validated, Windows-based platform supporting method storage, time-programmed flow/pressure profiles, event-triggered data capture, and CSV-exportable logs with timestamps traceable to system clock (NIST-synchronized). The software complies with FDA 21 CFR Part 11 requirements for electronic records and signatures when configured with user-role permissions, audit trail activation, and digital signature enforcement. Raw pressure and flow telemetry are sampled at ≥10 Hz and buffered onboard during communication latency, ensuring no loss of transient response data during catalyst breakthrough or pressure surge events.

Applications

• Fixed-bed hydrogenation catalyst activity and deactivation profiling under industrially relevant LHSV (liquid hourly space velocity) and H₂:feed ratios
• Trickle-bed reactor hydroprocessing studies requiring precise co-feeding of liquid feedstock and high-purity H₂ carrier streams
• In situ FTIR or online GC-MS coupling where pulse-free, low-drift flow is essential for quantitative analyte transport
• Kinetic parameter estimation (e.g., TOF, apparent activation energy) via controlled step-change experiments in flow-through reactors
• Multi-variable screening of bimetallic or support-modified catalysts using programmable gradient feed composition
• Long-duration stability tests (>500 h) with automated buffer flush cycles to mitigate salt fouling in Ni/Mo–Al₂O₃ or CoMo/zeolite systems

FAQ

What is the maximum recommended operating pressure for the standard CP-LDI configuration?

The standard CP-LDI unit is rated for continuous operation up to 600 psi (41.4 bar); higher-pressure variants (1500 psi, 3000 psi, and 6000 psi) are available with modified plunger seals and reinforced housing.
Can the CP-LDI be used with aggressive solvents such as concentrated HCl or HF-containing media?

No—wetted materials are not resistant to hydrofluoric acid or hot concentrated mineral acids. For such applications, Hastelloy C-276 or titanium pump heads must be specified separately.
Does the pump support automatic calibration verification per ISO 8981 or USP <621>?

While the CP-LDI itself does not perform gravimetric calibration, its flow accuracy (±1%) and precision (≤0.1% RSD) meet the performance thresholds required for method validation under USP <621> and ISO 8981 Annex B when verified externally using certified flow meters.
Is remote start/stop and fault reporting possible via PLC integration?

Yes—the analog I/O port supports 4–20 mA pressure feedback and discrete TTL-level signals for run/stop/alarms, enabling seamless integration into Siemens S7, Allen-Bradley CompactLogix, or Beckhoff CX-series control systems.
How often should the pump seals be replaced during continuous catalyst testing?

Under typical hydrotreating conditions (e.g., 300°C, 50 bar, diesel-range feed), sapphire/PEEK check valves and fluoropolymer-coated plungers demonstrate >6 months service life; replacement intervals are logged automatically in ChromaControl Suite based on cumulative stroke count and pressure history.