Project overview:
Vitamin C drugs are white monoclinic crystals or crystalline powder with a melting point of 190℃-192 ℃. They have no odorous acid, and the color becomes slightly yellow over time. The drug is easily soluble in water, slightly soluble in ethanol, and insoluble in ether and chloroform. Its aqueous solution showed an acidic reaction. The specific rotation of 5%(W/V) aqueous solution at pH 2.1 -2.6 (W/V) aqueous solution is +20.5°~21.5°

Overview of vitamin C drying equipment:
Material parameters: 
(1) Material name: VC granules
(2) Processing capacity: 1 ton/hour
(3) Initial moisture content of material: 15%
(4) Final moisture content of material: <0.2%
(5) Inlet air temperature: 80℃, discharge temperature: <40℃, dry ^high bearing temperature of material: <80℃.
(6) Bulk proportion of dry materials: about 0.5t/m3
Fluidized bed parameters:
(1) Drying form: vibrating fluidized bed
(2) Heat source: saturated steam pressure: ≤0.8MPa
(3) Drying method: The air processed by the intermediate and high-efficiency filter is heated (the heater is made of stainless steel 304 tubes and stainless steel 304 fins), and the hot air enters the equipment after being processed by the high-temperature high-efficiency filter.
(4) Dehumidification method: Clean air enters the equipment through dehumidification through the surface air cooler. Cold water temperature: winter: 15℃, summer: 9℃.
(5) Basic requirements for equipment production: ① Comply with FDA requirements. It is required that the material in contact with the material is 316L, and all others are made of 304 material (including the air duct flange). The equipment cavity and the inner wall of the air duct are polished with a polishing accuracy of less than 0.4μm, and wall hanging shall not occur. The entire equipment needs to be de-charged. For insulation of the host equipment and hot air pipes, stainless steel 304 skin is required, and the weld is argon arc welding ② meets the production capacity requirements.

Characteristics of vitamin C drying equipment：
(1) Material loss rate: ≤0.1%
(2) Process: The material enters the vibrating fluidized bed inlet through the granulator (a sampling port is made above the fluidized bed inlet to facilitate sampling and inspection of the granulation effect), is dried by purified hot air and then cooled by purified and dehumidified cold air. After discharging from the outlet. Use a stainless steel 304 bag dust collector for powder collection (choose a stainless steel 304 keel type rather than a spring type; the filter bag must provide verification materials that do not drop off floc and felt).
(3) The equipment body is insulated. All hot air section pipes must be insulated. The insulation skin is required to be made of 304 material and polished, and the insulation cotton is made of composite silicate board.
(4) Equipment material: The parts in contact with the material of the fluidized bed body are made of 316L material, and all are polished with a polishing accuracy of less than 0.4μm. All air pipes are made of 316L sanitary pipes, and all are polished with a polishing accuracy of less than 0.4μm. All other parts are made of 304 material. The valve elements in contact with the material are made of sanitary products that meet FDA requirements.
(5) All electrical components are made of Schneider products from France. The fan adopts Shanghai General Motors Fan Co., Ltd., the fan frequency conversion adopts Siemens products from Germany, and the motor adopts frequency conversion motors. The air shutoff valve reducer and motor are all selected from the SEW brand. PLC uses Siemens products.