Herbal Extracts are concentrated forms of plant-derived compounds that are used for various medicinal and therapeutic purposes. These extracts are obtained by processing plants and isolating the active ingredients responsible for their beneficial effects.
There are several ways to classify herbal extracts based on their properties and applications. One common classification is based on the solvent used for extraction. Solvents like water, alcohol, and oil are commonly used to extract different types of compounds from plants. Water extracts, also known as herbal teas or infusions, are made by steeping herbs in hot water. These extracts are often used for their mild and soothing effects. Alcohol extracts, known as tinctures, are made by soaking herbs in alcohol or a mixture of alcohol and water. Tinctures are highly concentrated and are known for their long shelf life and fast-acting properties. Oil extracts, also called essential oils, are obtained through processes like steam distillation or cold-pressing. These extracts are highly concentrated and are used for their aromatic and therapeutic properties.
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Another classification of herbal extracts is based on the part of the plant used for extraction. Some extracts are derived from the leaves, flowers, or stems of the plants, while others are obtained from the roots, bark, or seeds. Each part of the plant contains different types and concentrations of active compounds, which determine their specific effects. For example, leaf extracts are often used for their antioxidant and anti-inflammatory properties, while root extracts are known for their immune-boosting and energy-enhancing effects.
Tips for selecting large flow filters
How to choose a large flow filter ? Let me introduce you below;
1. Selection of filter materials;
First, according to the chemical name of the fluid to be filtered, the available filter materials should be identified according to the chemical coordination, and then the operating temperature, operating pressure, pH value, operating conditions (eg, whether it is necessary to withstand steam, hot water or chemical sterilization) Etc.), evaluate one by one, and remove the filter material that is not applicable. Use is also an important consideration. For example, the filter materials for pharmaceuticals, foods or cosmetics must be FDA-approved materials; for ultrapure water, the filter materials that are pure and do not contain the release materials will affect the specific impedance; Choose a hydrophobic material and whether you need a "hygienic filtration" design and more.
2. Filtration precision;
This is a puzzling problem with zui. For example, to remove the visible particles, use a 25 micron filter; to remove the cloud from the liquid, use a 1 or 5 micron filter; to filter out small bacteria, a 0.2 micron filter is required. The problem is that there are two units of filtering accuracy: absolute accuracy / nominal accuracy.
Absolute accuracy / nominal accuracy
Absolute accuracy refers to particles that are 100% filtered out of the indicated accuracy. For any type of filter, this is almost an impossible, and not practical, standard because 100% is an infinite value. Absolute filters commonly known in the market, such as films, can only be called "near absolute" filters, while others are nominally accurate.
The nominal accuracy, this is the main problem: "Nominal precision does not have a standard that the industry has jointly identified and complied with." In other words, Company A can set the nominal accuracy at 85-95%, while Company B prefers to book 50-70%. In other words, Company A's 25 micron filtration accuracy may be equal to B's 5 micron, or finer. For this problem, experienced professional filter suppliers will help filter the choice of precision, and the fundamental solution is "trial."
3. The design of the filtration system;
This title involves a wide range. For example, which pressure source should be used, how much pressure is required, whether it is necessary to install two sets of filters in parallel to suit the system for continuous operation, and how to match the coarse filter for a wide particle size distribution. With fine filtration, whether a check valve or other device is required in the system. These require the use of units and filter suppliers to work closely together to find out the appropriate design.
4, the difference between surface filtration and depth filtration
Surface filtration mainly uses screen materials, and deep filtration uses felt materials. The differences are as follows:
1) The mesh material (nylon monofilament, metal monofilament) directly traps impurities in the filter on the surface of the material. The advantage is that the monofilament structure can be repeatedly cleaned and the cost is low; and the disadvantage is that the surface filtering mode is easy to cause clogging of the filter bag surface. This type of product is suitable for coarse filtration with low precision, and the filtering precision is 25-1200 μm.
2) Felt material (needle cloth, melt-blown non-woven fabric) is a common deep three-dimensional filter material, which is characterized by loose fibrous structure, high void ratio and increased impurity interception amount. The fiber material is a complex interception. The mode, that is, the larger particle impurities are trapped on the fiber surface, and the fine particles are captured in the deep layer of the filter material, so the filtration has higher filtration efficiency, and the high temperature surface heat treatment, that is, the application of the instant sintering technology, can effectively prevent the filtration. When the fiber is washed away by the high-speed fluid, the felt material is discarded (one-time use), and the filtration precision is 1-200 μm.
5. The material properties of the filter felt are as follows:
Polyester--zui commonly used filter fiber, good chemical resistance, working temperature is less than 170-190 °C
Polypropylene - for liquid filtration in the chemical industry, with excellent acid and alkali resistance, operating temperature less than 100-110 ° C
Wool - very good anti-solvent function, but not suitable for acid and alkali filtration
Nielong - has good chemical resistance (except acid resistance), working temperature is less than 170-190 ° C
Fluoride - has good temperature and chemical resistance, and the working temperature is less than 250-270 °C