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We have more than 150 varieties of products in extraction, concentration, alcohol precipitation, distillation, drying and liquid preparation and many kinds of reactors, and extend our product range to chemical, food, environmental protection and other fields. Our products are sold in many countries and regions, such as Indonesia, Korea and the United States. Some customers still choose our products in the 2nd and 3rd phases of expansion projects. Customers’ recognition has become our source power to keep improving. With superior product performance and good services, Tianjin Daming has established a good brand image and passed ISO9000 certification. Devoted to revitalizing national industries,

Product Technology

We have more than 150 varieties of products in extraction, concentration, alcohol precipitation, distillation, drying and liquid preparation and many kinds of reactors, and extend our product range to chemical, food, environmental protection and other fields. Our products are sold in many countries and regions, such as Indonesia, Korea and the United States. Some customers still choose our products in the 2nd and 3rd phases of expansion projects. Customers’ recognition has become our source power to keep improving. With superior product performance and good services, Tianjin Daming has established a good brand image and passed ISO9000 certification. Devoted to revitalizing national industries,

Classic Case

We have more than 150 varieties of products in extraction, concentration, alcohol precipitation, distillation, drying and liquid preparation and many kinds of reactors, and extend our product range to chemical, food, environmental protection and other fields. Our products are sold in many countries and regions, such as Indonesia, Korea and the United States. Some customers still choose our products in the 2nd and 3rd phases of expansion projects. Customers’ recognition has become our source power to keep improving. With superior product performance and good services, Tianjin Daming has established a good brand image and passed ISO9000 certification. Devoted to revitalizing national industries,

Service Center

We have more than 150 varieties of products in extraction, concentration, alcohol precipitation, distillation, drying and liquid preparation and many kinds of reactors, and extend our product range to chemical, food, environmental protection and other fields. Our products are sold in many countries and regions, such as Indonesia, Korea and the United States. Some customers still choose our products in the 2nd and 3rd phases of expansion projects. Customers’ recognition has become our source power to keep improving. With superior product performance and good services, Tianjin Daming has established a good brand image and passed ISO9000 certification. Devoted to revitalizing national industries,

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We have more than 150 varieties of products in extraction, concentration, alcohol precipitation, distillation, drying and liquid preparation and many kinds of reactors, and extend our product range to chemical, food, environmental protection and other fields. Our products are sold in many countries and regions, such as Indonesia, Korea and the United States. Some customers still choose our products in the 2nd and 3rd phases of expansion projects. Customers’ recognition has become our source power to keep improving. With superior product performance and good services, Tianjin Daming has established a good brand image and passed ISO9000 certification. Devoted to revitalizing national industries,

产品技术

Distillation Series

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The distillation column is specially used to recover organic solvents at positive and negative pressure in traditional Chinese medicine, food and chemical industries. 

Work principle: rectification, also known as fractional distillation, is the most common distillation method. It can separate ingredients of different volatility in the mixture to the required purity. The basic principle is described below: the ascending vapor phase along the distillation column (hereinafter referred to as the vapor phase) contacts with the descending liquid on the tray. As the concentration of the vapor phase is lower than that of the liquid phase, both will transfer mass to each other and gradually achieve a balance. When leaving the plate, the concentration of volatile ingredients in the vapor phase will increase while that of non-volatile ingredients decrease; and the concentration of volatile ingredients in the liquid phase will decrease while that of non-volatile ingredients increase. The two phases start separating on the tray. And the evaporation heat needed when the volatile ingredients enter the vapor phase from the liquid phase is provided by condensation heat when the non-volatile ingredients enter the liquid phase from the vapor phase. Steam generated from the bottom goes up along the column and its concentration gradually increases when passing through various trays. As long as there are enough trays, steam can meet the required purity when reaching the top. After steam on the top condenses, part is extracted as a product and the other part reflows to contact with the ascending steam. Both transfer mass to each other, so the concentration of volatile ingredients gradually decreases while that of non-volatile ingredients increases to the required purity when reaching the bottom. Part of reflux liquid vaporizes to steam in the reboiler and ascends along the column while the other part is extracted as a product at the bottom. Add raw materials to the column when its concentration meets relevant requirements on a certain tray. This tray is called the feeding tray. 

     (fractionating column)

The fractionating column, a tower-type gas undefined liquid contact device, is also called distillation column. It has two types, i.e. plate tower and packed tower. It can also be divided into continuous rectification column and batch rectification column.

(continuous rectification column)

Continuous rectification column consists of reboiler, tower body and condenser. Add raw materials to the tower body. The part above the feeding door is called rectification section while the other part is called stripping section. After steam condenses on the top, part of liquid reflows to the column and the other part is extracted as a product. When liquid reaches the reboiler, it will be vaporized and enter the column. The other materials at the bottom is extracted as a product. 

(batch rectification column)

 Batch rectification column is a batch rectification column. Add raw material to the distillation column one time and don’t put materials in the middle. The volume of batch distillation column is large. This method is to improve the concentration of volatile ingredients in the distillate. Only when materials in the column decreases to a specified value, can the distillation process stop. The characteristics of batch distillation are as follows: 1. The process is not steady. The concentration of volatile ingredients in liquid will gradually decrease with distillation. If the reflux ratio remains unchanged, the distillate concentration will also gradually decrease. To maintain a constant distillate composition, it’s necessary to increase the reflux ratio. Therefore, batch distillation includes constant reflux ratio and constant distillate composition. 2. The batch rectification column only has the rectifying section, which means that it has no stripping section to provide stripping effect. The device is more flexible to operate and has better adaptability. It is suitable for such conditions where the degree of separation and the type and composition of raw materials is frequently changed. It can also be used for initial separation of multi-component mixture. The capacity of batch distillation is small and mostly used in small factories. The design principle of batch distillation is basically the same with that of continuous distillation, i.e. calculating according to the constant reflux ratio or the composition of the constant distillate. Generally calculate the theoretical plate at the beginning or end of batch distillation, and then calculate the reflux ratio and product composition.

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