Customized low-temperature vacuum cold trap for liquid nitrogen cold trap

　　Customized low-temperature vacuum cold trap for liquid nitrogen cold trapAs the core equipment of deep low-temperature capture technology, it plays an irreplaceable role in vacuum system protection, analytical chemistry, and cutting-edge scientific research fields by utilizing the ultra-low temperature environment generated by liquid nitrogen (boiling point -196 ° C). The core principle is to efficiently capture condensable components in gases through extremely low-temperature physical adsorption: in a vacuum system, it blocks the pollution of water vapor, organic solvents, and corrosive vapors to the pump body; In analytical instruments. Provide a stable low-temperature environment for optical experiments. With the upgrading of environmental standards and the increasing demand for precision analysis, liquid nitrogen cold trap technology is continuously evolving towards multi-level, intelligent, and efficient energy-saving directions.

1、 The three core application types of liquid nitrogen cryogenic traps

Vacuum system protective cold trap: a key barrier to extend equipment life

This type of cold trap is installed between the vacuum chamber and the pump, forming the first line of defense to protect the vacuum pump:

Core functions:

Using a low-temperature surface with an internal temperature of ≤ -50 ° C, water vapor, oil vapor, and solvent vapor are condensed and captured to prevent them from entering the pump and causing oil emulsification or component corrosion, thereby improving the vacuum degree and extending the pump life by 17.

Typical products and technical features:

1. Vacuum liquid nitrogen cold trap: using stainless steel chamber and PTFE coating, with a capacity of ≥ 4000ml, compatible with KF25 flange interface, capable of handling highly corrosive gases.

2. Capture cold trap: Double wall flow guide design, supporting DN25/DN40 flanges, liquid nitrogen capacity of 1000ml, single filling can operate continuously for 5 hours without the need for electric drive.

3 filled stainless steel cold trap: specially designed for small vacuum systems, with a 500ml liquid nitrogen capacity, compatible with DN25 ISO-KF interface, suitable for laboratory concentration equipment.

Case study: In the chemical vacuum distillation process, capturing the cold trap extends the maintenance cycle of the vacuum pump from 3 months to over 1 year, while increasing the system vacuum degree by 40%.

Pre concentration cold trap for analytical instruments: the cornerstone of environmental monitoring sensitivity

VOCs enrichment for GC/GC-MS front-end, breaking the limit of trace detection:

Technological Innovation - Multi level Cold Trap Architecture:

Three stage cold trap system:

First stage dehydration trap (-190 ° C) → second stage enrichment trap (adsorbent combination) → third stage focusing trap (flash distillation, heating rate>10000 ° C/min). Realize a concentration ratio of>1000:1, with a detection limit of 0.1ppbv, meeting the requirements of HJ759-2015 and other standards.

Four stage cold trap system:

Innovative separation capture technology, independent water trap and VOCs recovery channel separation, solves the problem of adsorption loss of high boiling point compounds (such as naphthalene) in traditional three-stage systems, and improves the recovery rate by 170%.

Research grade low-temperature thermostat: a temperature engine for precision experiments

Provide a stable extremely low temperature environment for optical and material research:

Representative equipment: liquid nitrogen thermostat

Temperature control performance: within the range of 77K~500K, stability ± 0.1K (10 minute measurement cycle), cooling to 77K only takes 20 minutes.

Design

1.2L Dewar capacity, continuous operation for>15 hours at 77K

Top sampling structure, compatible with solid/liquid/powder samples

Radial f/1 optical path+four horizontal windows+vertical windows, compatible with spectrometer integration

Quick replacement of sample rod (completed in 5 minutes) 3.

2、 Core performance indicators and technological evolution trends

Horizontal comparison of key parameters

Customized low-temperature vacuum cold trap for liquid nitrogen cold trap.