CG-2 supercritical CO2 drying device

Overview

Supercritical drying technology is a new chemical technology developed in recent years. Commonly used drying techniques, such as drying at room temperature, baking and drying, etc., often inevitably cause agglomeration of materials during the drying process, resulting in coarsening of the material base particles, a sharp drop in specific surface area, and a large reduction in pores. The acquisition and the preparation of high specific surface materials are extremely disadvantageous. The supercritical drying technology is drying under the critical and critical pressure conditions of the drying medium, which can avoid the shrinkage and fragmentation of the material during the drying process, thereby maintaining the original structure and state of the material and preventing the agglomeration and condensation of the primary nanoparticles. And, this is very meaningful for the preparation of various nanomaterials.

The main technical parameters

1. Gel dryer: 1L/32MPa, 300°C

2. Separator 0.6L/30MPa, 85°C

3, refrigeration system: 2500kcal / h, air-cooled, imported core components

4. Storage tank: 2L/16MPa

5, high pressure pump: 20L/40MPa

6, frequency converter: 2.2kW

7, flow meter: 6.3 ~ 20L / 6.3MPa

8, total power: 9kW

Main structural composition

The supercritical aerogel drying instrument mainly consists of a gas source system, a refrigeration system, a voltage stabilization system, a temperature control system, a pressure control system, a drying device, a separation device, an electric control, a constant pressure system of the drying kettle, and a bracket box.

Structure description

Air source system:

Generally, CO2 is used as the drying medium. The system is self-provided. If it is not supplied by domestic gas cylinders or directly supplied by non-cylinders, the size of the gas source inlet should be provided to allow the device to access the system for normal operation.

Cooling System:

The system includes a refrigeration unit, a cold box, a refrigerating coil, and a cold circulation pump.

The system is a gas source liquefaction system that provides a liquid gas source during the supercritical drying critical displacement process.

Refrigeration unit:

Refrigeration form: air-cooled to ensure a stable supply of equipment cooling.

High pressure pump:

The high-pressure plunger CO2 pump is used as the power source to ensure the stable transportation of the drying medium. The pump head adopts special materials, which can adjust the demand of the fluid volume in each stage of the test.

Pressure range: atmospheric pressure ~ 40MPa

Maximum flow: 20L/h

Frequency converter: 2.2kW

Flow metering system:

The gas mass flow meter is combined with the flow digital display meter to measure the CO2 gas in the pipeline, and the measurement accuracy reaches 1% F.S.

Flow control range: 6.3 ~ 20L / h

Temperature control system:

The PID program temperature is used for temperature control, and during the use, the temperature is adjusted according to the temperature increase range, such as: 0.5 ° C / min, 2 ° C / min, and the like. The temperature gradient adjustment value is set, and the system performs automatic control of self-tuning, and the whole process is automatically completed without manual operation.

Temperature control range: normal temperature ~ 300 ° C

Pressure control system:

It is controlled by the US imported back pressure regulating valve. Maximum inlet pressure: ≤32MPa

Export pressure: 0 ~ 32MPa

Applicable medium: weak corrosive

Drying device:

The volume is 1000ml, the internal precision grinding treatment, the design pressure is 40MPa, the temperature is 300°C, the internal temperature is measured, and the external design thermal insulation device.

The length to diameter ratio of the dryer is designed separately based on the specificity of the gel sample preparation:

In order to improve the application range of the drying device and meet the requirements of sample processing for different drying media, the design temperature and pressure of the dryer are relatively high, and the sample preparation conditions can be adjusted within a wide range.

Separation device:

The separation device is the main place for gas-liquid separation. Most of the liquid is effectively recovered here. The recovered liquid can be recycled again after being collected, and the gas passes through the upper outlet to the next step.

Separation volume: 600ml

Separation pressure: 30MPa

Preheater:

Preheating for drying kettle, preheating temperature: ≤250 °C.

Condenser:

Cooling for the front end of the pressure control system ensures proper operation of the pressure control system.

Electrical control and cabinet bracket:

According to the requirements of modern laboratories, the shape design of the equipment is beautiful and generous. Adopting A3 phosphating spray main structure, man-machine operating environment, well-arranged, harmonious with modern laboratory.

(can be customized according to customer requirements) telephone; 15962789955