Continuous drying device and method for mesoporous powder material

Abstract

The invention discloses a continuous drying device and method for a mesoporous powder material and relates to a mesoporous powder material. The outlet valve of a carbon dioxide steel cylinder is connected with the input opening of a high-pressure pump through a condenser; the output opening of the high-pressure pump is connected with a buffer still through a pressure-reducing valve; the carbon dioxide output opening of the buffer still is connected with the inlet of a first stop valve; the outlet of the first stop valve is connected with a spray nozzle; the outlet of a storage tank is connected with a plunger metering pump; the outlet of the plunger metering pump is connected with the spray nozzle through a preheater and a check valve; the spray nozzle is connected with a drying kettle; the gas outlet in the top of the drying kettle is connected with a gas flowmeter; the mesoporous powder material outlet in the lower part of the drying kettle is connected with a discharging kettle through a second stop valve; carbon dioxide is exhausted from the outlet of the discharging kettle through a third stop valve. Carbon dioxide is fed into the spray nozzle and is introduced into the drying kettle; wet materials are fed into the same spray nozzle, pre-expanded, sprayed by the spray nozzle and then fed to the drying kettle; after the sprayed materials are dried, the mesoporous powder material is collected in the discharging kettle. According to the continuous drying device and method, wet mesoporous materials can be quickly dried and continuously discharged, and thus continuous supercritical drying of the mesoporous power materials is realized.

Description

technical field [0001] The invention relates to mesoporous powder materials, in particular to a continuous drying device and method for mesoporous powder materials. Background technique [0002] Mesoporous powder materials have broad application prospects. For example, silica airgel is a solid amorphous mesoporous material composed of nano-silica particles aggregated into a three-dimensional network structure. It has the characteristics of low density, large specific surface area, high porosity, and good chemical stability. , catalysis, energy conservation and environmental protection and other fields have broad application prospects. Another example is mesoporous metal oxide materials such as aluminum oxide, magnesium oxide, and hydroxyapatite, which are widely used in catalysis and adsorption. [0003] The sol-gel method is a common method for preparing mesoporous oxide materials, which includes the steps of gel preparation, aging, gel drying, and calcination. The dryin...

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Problems solved by technology

However, the supercritical drying methods in the above patents and a large number of other literature reports are all batch operations, and there is no literature report on the continuous operation of supercritical drying methods, which greatly limits the output of supercritical drying products and greatly limits The application of supercritical drying method

For example, in order to obtain high-yield products, it is necessary to increase the volume of the drying kettle by using the batch method for supercritical drying, which will greatly increase the cost of equipment and is not conducive to large-scale industrial production.

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