GAS-Pro Pre-Pressurization and Vacuum System
| Brand | Xianghu |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | GAS-Pro |
| Pricing | Available Upon Request |
| Vacuum Level | ~70 kPa (absolute) |
| Motor Power | 25 W |
| Air Flow Rate | 15 L/min |
| Input Voltage | 220 V AC |
Overview
The GAS-Pro Pre-Pressurization and Vacuum System is an integrated gas handling module engineered for controlled atmosphere management in high-pressure microwave-assisted synthesis, hydrothermal reactions, and catalytic processes. Designed exclusively for integration with Xianghu’s series of multimodal reaction platforms—including microwave-only, microwave–ultrasound, and microwave–ultrasound–UV configurations—the GAS-Pro enables precise pre-injection of inert or reactive gases (e.g., N2, H2, CO, NH3) into sealed high-pressure reactors prior to thermal activation. Its operational principle relies on a dual-mode pneumatic architecture: a low-power, oil-free diaphragm vacuum pump establishes initial sub-atmospheric conditions (~70 kPa absolute), followed by regulated gas introduction via calibrated solenoid valves and pressure-rated stainless-steel tubing. This sequential pressurization protocol ensures reproducible headspace composition, eliminates residual air interference, and enhances reaction selectivity—particularly critical in oxygen-sensitive catalysis, hydrogenation, and nitridation syntheses.
Key Features
- Integrated dual-function design supporting both vacuum evacuation and controlled gas injection within a single compact unit
- Oil-free diaphragm pump with 25 W motor rating, delivering stable flow up to 15 L/min at ambient temperature and pressure
- Robust construction using chemically resistant materials: 316 stainless steel gas pathways, EPDM-sealed valves, and reinforced PTFE-lined tubing
- Modular interface compatible with Xianghu’s standard high-pressure reactor vessels (up to 10 MPa rated pressure) and multimodal control consoles
- Real-time pressure monitoring capability via optional analog output (0–5 V) for synchronization with external data acquisition systems
- Compliance-ready mechanical architecture—no internal electronics or firmware; fully manual or externally triggered valve actuation supports GLP/GMP-aligned process documentation
Sample Compatibility & Compliance
The GAS-Pro system is validated for use with standard Xianghu high-pressure autoclave reactors (e.g., XH-800/1000 series) and supports sample matrices including aqueous precursors, organic solvents, solid catalysts, and heterogeneous slurries. It imposes no thermal or electromagnetic constraints on downstream instrumentation, making it suitable for concurrent operation with microwave irradiation (2.45 GHz), ultrasonic transducers (20–40 kHz), and UV lamps (254/365 nm). From a regulatory standpoint, the system adheres to ISO 10297:2014 (gas cylinder valve interfaces) and ASTM E2913-13 (standard guide for pressure vessel safety in laboratory-scale chemical synthesis). As a non-electronic, non-data-generating auxiliary device, it requires no FDA 21 CFR Part 11 validation but may be included in audit trails when paired with compliant control software (e.g., Xianghu’s ChemWave™ v4.x).
Software & Data Management
The GAS-Pro operates as a hardware-level subsystem without embedded firmware or standalone software. All operational sequencing—including vacuum duration, gas type selection, injection pressure setpoint, and dwell time—is managed externally via the host reaction platform’s control interface. When used with Xianghu’s ChemWave™ software suite, users can define and store complete gas-handling protocols as part of method templates. Each run generates timestamped log entries indicating vacuum attainment, valve actuation events, and final chamber pressure—exportable in CSV format for traceability. Audit trail functionality complies with ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) when deployed in validated environments.
Applications
- Pre-pressurized microwave hydrothermal synthesis of metal oxides (e.g., TiO2, ZnO) under controlled N2 or Ar atmospheres
- In situ hydrogenation of unsaturated organics using H2-charged reactors coupled with microwave–ultrasound energy input
- Oxygen-free catalytic coupling reactions (e.g., Suzuki, Heck) requiring strict exclusion of atmospheric O2
- Gas-phase photochemical activation in UV–microwave hybrid reactors for NOx reduction or VOC degradation studies
- Pressure-dependent kinetic profiling of solid-state transformations, including phase transitions and crystallization nucleation thresholds
FAQ
Does the GAS-Pro include built-in pressure regulation or only fixed-flow gas delivery?
The GAS-Pro provides passive flow control via calibrated orifices and manual needle valves. For precise pressure regulation, it must be used in conjunction with an external pressure controller or regulator installed upstream of the inlet port.
Can the system handle corrosive gases such as HCl or Cl2?
Standard configuration uses EPDM seals and 316SS components, which are compatible with dry HCl at low concentrations and ambient temperatures. For continuous exposure to aggressive halogens or acidic vapors, optional perfluoroelastomer (FFKM) seals and Hastelloy C-276 wetted parts are available upon request.
Is the vacuum level of ~70 kPa sufficient for degassing viscous reaction mixtures?
Yes—this level corresponds to approximately 30 kPa gauge vacuum, adequate for bulk removal of dissolved air and volatile solvents from low-to-medium viscosity media (<500 mPa·s). For ultra-high vacuum requirements (<1 kPa), supplemental roughing pumps are recommended.
