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The processing of many pesticides can’t be separated from drying
oven, and the high requirement of pesticide dosage form also brings
new development space to air circulation oven. In
the past, the pesticide industry mainly use drying oven, drying room and other
static drying, then break into powder after drying. Not only the production
conditions were very bad, the use of drugs and the effectiveness were limited.
Using new drying methods and new drying technology will play a very important
role in the development of new pesticide formulations.
The characteristics of pesticide drying
Pesticide drying and other chemical products drying has
many differences. First, the dosage form of pesticide is more, in addition to
liquid dosage form, solid dosage form has powder, granular, block, strip,
flake. For pesticides, drying is not only evaporation of water, but also the
formation of different solid forms in the drying process, but also to ensure
the role of drugs, so the drying process is also the process of dosage form
manufacturing. Therefore, the drying equipment used is more complex. Secondly,
toxic and taste are the basic characteristics of pesticide products, and the
safety protection of drying field workers is very important.
The discharge of gas during drying operation should also be
strictly controlled. For example, efficient herbicide drying, if there is
farmland around the production site to ensure the safety of crops. After
drying, the economical heat source is chosen as far as possible, especially the
pesticide with low added value should control the production cost.
There are two main parts of drying, one is the drying of
pesticide processing aids and fillers, the other is drying in the preparation
process to obtain the final product.
Because the moisture content of pesticide products is
strict and the moisture content of fillers directly affects the quality of
products, the drying of fillers is also an important link in the processing of
pesticide powder. Because of the large amount of pesticide, considering the
product price, the filler of pesticide powder is mainly clay, clay, kaolin,
silica and other minerals. For this reason, the pesticide drying equipment
basically uses convection drying, and mainly to rotary dryer, box dryer,
airflow dryer, shaft kiln and so on. With the improvement of preparation
technology, spray dryer and other equipment began to be equipped in pesticide
production. Rotary fast dryer, blade dryer has also been used.
