Comparison between dry and wet methods for modified starch

Dry and wet methods are the most commonly used methods in the production of modified starch, each with its own advantages and disadvantages. The specific content is introduced by JINAN SPARK IMP&EXP CO., LTD., a manufacturer of modified starch

1. Wet methods are widely used, and almost any variety of modified starch can be produced using wet methods. The dry method is only applicable to the production of a few varieties, such as dextrin (such as cyclodextrin), acid degraded starch, phosphate starch, etc. Although the yield is not small, there are not many varieties.

2. The reaction conditions for wet production are mild, with a reaction temperature not exceeding 60 ℃ and a pressure of atmospheric pressure. The dry reaction temperature is high, usually between 140-180 ℃, and some reactions need to be carried out under vacuum conditions.

3. The wet reaction time is long, usually 24-48 hours; The dry reaction time is short, usually 1-4 hours.

4. Wet production process factories need to go through several processes such as washing, dehydration, and drying; The dry process is short and does not require washing, dehydration, drying and other processes, so the production cost of dry process is low.

5. The wet process has a low yield, generally between 90-95%; Dry process has almost no loss, and the yield is mostly above 98%.

6. The wet process reactor has a simple structure and can be made of enamel, fiberglass, and steel lined fiberglass. The reactor can be made larger, with a maximum capacity of up to 70m ³. The structure of the dry reactor is relatively complex and requires special materials to be manufactured. The volume of the reactor cannot be too large, with a maximum of 10m ³.

7. Wet process consumes water and causes pollution, typically producing 3-5 cubic meters of wastewater for every 1 ton of modified starch produced; And the dry method does not use water, nor does it discharge sewage.