Step 1. Remove hematoxylin pigments with hot water
At area temperature, include the smashed hematoxylin core product to 20 times the weight of water, heat to 90 ° C, and extract for 1 hour for a total amount of 3 times.
Action 2: Use a mesh crude filter
Use a 180-mesh steel cable mesh to coarsely filter the hematoxylin fluid and slag mixture while it is hot to divide the hematoxylin liquid and slag, and combine each filtrate to get a red and yellow Hematoxylin remove.
Step 3: Purification with filter paper
Place the fast qualitative filter paper on the Buchner funnel, and use a vacuum pump to vacuum (vacuum cleaner degree is 0.098 MPa) to filter the product liquid.
Step 4: Microfiltration membrane filtering, contamination removal and sterilization
Utilize a circulation pump to pass the material fluid with a temperature below 35 ° C through the filter paper through the microfiltration membrane inlet. The input material is polyvinylidene fluoride (PVDF) and the pore dimension is 0.2 μm. The external stress microfiltration membrane layer is gotten used to 0.04. MPa, the non-permeate fluid still flows back to the initial solution container, and the procedure is duplicated until the permeate fluid basically does not drain, and the clear and transparent permeate liquid and the non-permeate fluid containing pollutants are accumulated respectively.
Step 5: Use ultrafiltration membrane to concentrate the Hematoxylin remedy
A hydrophobic polysulfone (PS) ultrafiltration membrane with a molecular weight cutoff of 3000 is made use of to concentrate the clear and translucent feed liquid that has travelled through the microfiltration membrane layer up until the strong material of the feed liquid is 5%. During the microfiltration membrane layer focus process, the membrane operating pressure was adapted to 0.02 MPa. The retentate that has actually not gone through the ultrafiltration membrane layer is a concentrated solution of hematoxylin. The concentrated service is subjected to the following spray drying out procedure. The content of hematoxylin in the permeate is very low and can be reused to extract Hematoxylin.
Action 6. Spray drying out
Make use of a spray dryer to vaporize the water in the Hematoxylin concentrate to prepare hematoxylin pigment powder with high material of reliable pigment components.