Vapor adsorption apparatus

Fully automatic vapor adsorption instrument

1： Instrument principle structure diagram

Fully automatic vapor adsorption instrumentThe instrument is mainly composed of a vacuum constant temperature and humidity chamber, with a customized micro balance built-in. The balance has a certain degree of sealing and can work normally under a certain relative humidity, maintaining stability. Its appearance is smaller than the existing one ten thousandth gram balance and larger than the magnetic levitation micro balance. The vacuum constant temperature and humidity chamber is connected to the crucible through a support, with a distance of more than 5cm. The heating zone is located in the crucible area, with a maximum temperature of 100 ℃. The vacuum pump has a maximum vacuum degree of 10-2PA. Buffer tanks are added for vacuum pumping and air intake, and the pumping and air intake speeds are strictly controlled. The heating adopts an imported program-controlled PID temperature controller, and R485 communicates with the computer to avoid sample splashing; The steam generator and pipelines are made of stainless steel material, and the heating uses a four-way PID temperature controller. R485 communicates with the computer, and the control port is controlled by the motherboard I/O, while the pressure sensor is collected by the motherboard AD; The microbalance is powered by vacuum electrodes and R485 collects signals.

Specific implementation: Load a certain amount of dried moisture sample into a customized miniature balance in a constant temperature and humidity box. The balance is connected to the outside world through communication lines and power lines (using vacuum electrodes). The instrument carrier gas and steam generator are connected to the vacuum constant temperature and humidity box through pipelines to control the inlet pressure of high-purity gas and the inlet of water vapor. The humidity of the mixed gas of water vapor and high-purity nitrogen (the hygrometer should use 1.5% relative humidity accuracy, adopt dual probe distribution value, and then take the average), pressure value, and balance weight should be monitored, read, and saved in real time, and a real-time graph should be drawn. It should be able to directly read the weight measured by the balance under a certain relative humidity at a set pressure. And draw adsorption and desorption curves based on weight.

2： Technical features

⑴ Combining the advantages of microbalance, gas flow, and steam measurement technology.

⑵ Use a dry carrier gas, usually nitrogen, and choose one of any two steam sources.

The combination of quality flow control and real-time monitoring of water and organic vapor concentration in dute can accurately control the proportion of saturated dry carrier gas flow.

The temperature of the entire system can be selected and precisely controlled under closed loop conditions to ensure a constant vapor pressure of the adsorbate.

⑸ It has extremely high sensitivity and accuracy, requiring only a small amount of sample (usually 1-30mg), thus achieving equilibrium quickly.

The fully automatic inert gas blowing device and organic leakage detector can close the interlock device in case of organic vapor leakage to ensure safety.

The software is programmable to control the instrument, with a user-friendly interface that meets the highest standards of data integrity and security.

The sample to be tested is placed on a microbalance, and a known concentration of vapor passes through the sample. The microbalance can measure the mass change caused by vapor adsorption or desorption. This dynamic flow environment makes it easy to quickly study adsorption/desorption processes. If further experimental selection is necessary, the sample can be preheated first, which can accelerate the analysis cycle time of bulk adsorption or inorganic oxide drying process. The heating process can be carried out independently or the heating rate can be controlled through software.

3： Product performance

Dynamic weighing range: 10-5000mg;

◆sensitivity/Range:1mg/10000mg

◆ Simultaneous analysis of sample quantity: 2, 4, 8 optional; Simultaneous analysis of multiple stations significantly improves efficiency;

Test gas types: water vapor, organic vapor, various gases;

◆ Storage capacity of steam reagent liquid: 180ml;

Vacuum degassing temperature range: room temperature~400 º C, multi-stage programmed heating, to prevent sample flying and protect the sample;

Control range of steam partial pressure P/P0: 0.01% to 99%;

◆ Support synchronous testing of blank spaces to reduce testing errors and improve testing accuracy;

Equipped with an automatic distillation and purification system, it can obtain high-purity adsorption steam source;

◆ It has the function of testing saturated steam compaction, and the accuracy of saturated steam pressure P0 is greatly improved;

◆ In response to the characteristics of steam adsorption, a liquid nitrogen low-temperature cold trap is equipped to effectively prevent steam from entering the contaminated vacuum system and improve the vacuum degree;

For steam adsorption, the instrument is equipped with a full constant temperature device, and the full adsorption system has no cold spots;

All pipelines and valves are sealed with oil resistant and corrosion-resistant design;

◆ Switching between steam and gas testing;

◆ Automatic airtightness detection process, intelligently determining whether the instrument's airtightness is qualified;

◆ It has the function of automatically restoring normal pressure after testing to prevent sample splashing;

Clear and vivid graphical control interface, and all hardware control operations can be performed on the software interface;

Detailed instrument operation logs, accurate to seconds, provide reliable operation and after-sales support for the instrument;

◆ Real person voice prompts for each testing process;

◆ Automatic email notification function, even if the operator is on a business trip, they can easily understand the operation status of the instrument, test progress, and view test results;

The key components for procurement are imported;

4： Main functions

Vacuum gravimetric vapor adsorption desorption isotherm (VVS)

Vacuum gravimetric vapor isobaric adsorption desorption rate (VVS);

Vacuum gravimetric gas adsorption desorption isotherm (VGS);

Vacuum gravimetric gas isostatic adsorption desorption rate (VGS);

◆ Vacuum gravimetric programmed temperature rise degassing rate (TPD);

◆ Distillation and purification of reagents;

◆ Surface area analysis (steam);

Analysis of pore volume and diameter (steam);

5： Report content

Analysis and Summary Report

Vacuum degassing thermogravimetric report

◆ Adsorption desorption isotherm

◆ Adsorption desorption rate

BET single point method for surface comparison

Langmuir specific surface area

◆ BJH method mesoporous analysis

◆ T-plot method for microporous analysis

D-R method for microporous analysis

◆ HK method micropore analysis

◆ SF method micropore analysis

6： Analysis position selection interface

◆ 2/4/8 analysis positions to choose from

◆ 1~8 analysis positions can be enabled arbitrarily

◆ Significant improvement in efficiency

7： Degassing interface

◆ Simultaneous degassing at multiple stations

◆ Constant weight degassing mode

◆ Program heating and degassing

◆ Program speed control

◆ Synchronized display of weight, time, temperature, and pressure

Vacuum thermogravimetric analysis

8： Analysis interface

Simultaneous analysis of multiple stations to solve efficiency problems

High precision constant voltage control program

◆ Consistent adsorption environment, parallel comparison

◆ Synchronized display of weight, time, temperature, and pressure

◆ Long term fully automatic operation

9： Some typical customers