Drying equipment in the chemical and pharmaceutical industry

Drying equipment has a wide range of applications in the chemical and pharmaceutical industries, and its main function is to vaporize and escape the moisture (generally referred to as water or other volatilizable liquid components) in the materials through heating, so as to obtain solid materials with specified moisture content. The following are several common applications of drying equipment in the chemical and pharmaceutical industries and their characteristics:

I. Belt dryer
Structural characteristics: composed of several independent unit sections, each unit section includes a circulating fan, heating device, separate or common fresh air intake system and exhaust system.
Application advantages: flexible operation, wet material feeding, drying process in the sealed box, labor conditions are better, to avoid the leakage of dust.
Applicable materials: drying of flakes, strips and granular materials with good permeability, especially suitable for dehydrated vegetables, Chinese medicine tablets and other materials with high water content and high material temperature is not allowed.

Second, drum scraper dryer
  Structural characteristics: through the rotating cylinder, by way of heat conduction, will be attached to the cylinder wall of the liquid phase materials or strip materials for drying a continuous operation of the equipment.
Application Advantage: It can be heated and dried by steam, hot water or hot oil, and cooled and knotted by cold water; according to different material properties and technological requirements, it can be used in the way of adding materials such as immersion, spraying and grinding.
Applicable materials: mainly used to deal with liquid materials, such as various slurries, solutions, etc..

Hollow Blade Dryer
  Structural characteristics: mainly consists of W-shaped shell with jacket and two hollow paddle shafts and transmission device.
Application advantages: the material in the drying process, with hollow blades of the hollow shaft in the heating of the material at the same time and stirring the material, so as to carry out the renewal of the heating surface.
Applicable materials: It is suitable for dealing with various kinds of paste, granular, powder and other materials with good thermal stability, and can also be used for drying heat-sensitive materials and recovering solvents in the drying process.

Vacuum harrow dryer
  Structural characteristics: the equipment is equipped with rake teeth, through the stirring and turning effect of the rake teeth, so that the material is heated evenly.
Application advantages: It is suitable for materials which are heat-sensitive, easy to oxidize under high temperature or easy to plate when drying, as well as materials which need to recover the steam discharged in drying.
Applicable materials: sodium acrylsulfonate, CMC, phthalocyanine blue, dye intermediate, carboxymethyl starch, maltodextrin, anthraquinone sulfonic acid, etc.

V. Double Cone Rotary Vacuum Dryer
  Structural characteristics: the body of the equipment is slightly like an olive, with cover at both ends and two shafts in the middle to support the body; the body has a jacket for heating, and the body can rotate when drying.
Application advantages: overcoming the shortcomings of low thermal efficiency of the vacuum oven in which the material mainly relies on the conduction of the heating cylinder.
Applicable materials: mainly used in medicine, chemical industry, food and other industries of powder, granular and fibrous materials, concentration, mixing, drying and low-temperature drying of materials (such as biochemical products, etc.), more suitable for easy to oxidize, volatile, heat-sensitive, strong stimulation, toxic materials and materials are not allowed to destroy the drying of crystals.

Spray dryer
  Structural characteristics: often for the garden cylinder or other shell that can bear vacuum operation, inside the electric heat or hot water, heat conduction oil through the heating plate or heating tube for heat supply.
Application advantages: especially suitable for generating powdery and granular solid products from solution, emulsion, suspension and paste liquid raw materials; after depressurization, the evaporation temperature of volatiles contained in the material evaporation can be lowered, and it is suitable for drying all kinds of heat-sensitive and oxidizable materials.
Applicable materials: widely used in chemical, pharmaceutical, food and other industries of liquid materials drying.

Seven, oven
  Structural characteristics: general-purpose drying equipment, is a disk rack type batch drying equipment.
Application advantages: fast drying speed, material residence time can be adjusted.
Applicable materials: raw materials, raw drugs, Chinese medicine tablets, extracts, powders, granules, punch, water pills and so on.

Eight, fluidized bed dryer
  Structural characteristics: through the hot air or gas in the fluidized bed of the material to perform uniform and energy-saving drying operations.
Application advantages: greatly improve the drying efficiency, significantly reduce the production cycle, enhance the production efficiency; can ensure the uniformity of the material drying, to prevent local overheating or over-drying, to ensure the stability of product quality.
Applicable materials: It is widely used for granular or powder materials such as catalysts, dyestuffs, fertilizers, etc. in the chemical industry, raw materials and intermediates in the pharmaceutical industry, as well as grains, milk powder and seasonings in the food industry.

To summarize, drying equipment has a wide range of applications and important role in chemical and pharmaceutical industries. Different types of drying equipment have different structural characteristics and application advantages, and are suitable for different types of materials and process requirements. When choosing drying equipment, it is necessary to make comprehensive consideration according to the nature of materials, drying requirements and production scale and other factors.