Hydroquinone Material Description:

Hydroquinone is an organic compound. Hydroquinone is a compound formed by the substitution of two para-hydrogens of benzene with hydroxyl groups. White crystals. Hydroquinone poisoning, adults mistakenly served 1 gram, you can headache, dizziness, tinnitus, pale and other symptoms. Hydroquinone fire, high fever flammable. Hydroquinone and strong oxidants can react chemically. Hydroquinone emits toxic gases by pyrolysis. Hydroquinone is mainly used for preparing black and white developers, anthraquinone dyes, azo dyes, rubber antioxidants, stabilizers and antioxidants.

Hydroquinone Production Method:
1. The aniline, manganese dioxide and sulfuric acid molar ratio of 1: 3: 4 was added to the reactor, feeding should be in the jacket through the chilled water control temperature below 10 ℃. The reaction was stirred for 10h, the reaction temperature gradually increased to about 25 ℃, generating benzoquinone. Then pass steam into the reactant for steam distillation, the distilled benzoquinone and water vapor are partially condensed, then flow into the reduction kettle, then iron powder with the molar ratio of benzoquinone of 1: 0.7 is added, heated to 90-100 ℃, stirring for 3 ~ 4h, the product of the reduction reaction hydroquinone. The reduced product was filtered to remove the iron oxide residue, and concentrated under reduced pressure. Then add sodium metabisulfite, activated carbon, zinc powder, heated to boiling for bleaching. After hot filtration, the filtrate was slowly cooled to below 30 ℃, hydroquinone to needle crystallization, after centrifugation dehydration, adding boiling bed at 80 ℃ for drying, the finished product.

Horizontal boiling dryer Product Overview, Principle:
Boiling dryer, also called fluidized bed, has been used more and more for more than 30 years to improve it. At present, it plays an increasingly important role in the pharmaceutical, chemical, food and food processing industries. It is composed of air filter, ebullated bed host, cyclone, bag filter, high pressure centrifugal fan, console. Due to the different nature of the dry materials, supporting dust removal equipment, according to need, while the cyclone can be selected, bag filter, but also choose one of them. In general, the larger proportion of the material only need to select the cyclone. The proportion of lighter materials required to support the bag filter, and with pneumatic feeding device selection.

Horizontal boiling dryer features:
Clean hot air distribution by the valve plate into the bed, from the feed into the wet material is heated to a boiling state. As the hot air and materials in extensive contact, increasing the heat and mass transfer process, so in a short period of time can be dry. Into the bed from one end, after dozens of seconds to a few minutes boiling dry automatically from the other end of the bed outflow. The device is generally negative pressure operation.

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  Hydroquinone horizontal boiling dryer