Location: Tangshan City, Hebei Province
Water Source: Waste Alkali
Capacity: 5m³/h
User: Chemical Fiber Industry
Purpose: Recovery of Alkali Solution and Hemicellulose
Commissioning Date: June 2025
In the production of viscose fiber, an alkali solution is used to dissolve hemicellulose from pulp. If the concentration of hemicellulose in the alkali solution becomes too high, it can adversely affect the quality of the viscose fiber products. To maintain the hemicellulose content in the impregnation alkali solution, the common practice is to discharge a portion of the impregnation alkali solution and supplement it with fresh alkali. The discharged impregnation alkali solution is referred to as waste alkali. The main components of waste alkali are sodium hydroxide and hemicellulose. PSI alkali-resistant membranes are employed to purify and recycle the alkali solution and recover hemicellulose.
|
Material Temperature |
45～55℃ (highest <70℃) |
Working Pressure |
1.5～3.5MPa |
|
Alkali Concentration |
220～225g/L |
Hemicellulose Content |
35g/L |
|
Net Alkali Quantity |
5m3/h |
Net Alkali Recovery Rate |
＞55% |
|
Hemicellulose Content in Net Alkali |
5.0g/L (within two years) |
Black Liquor Hemicellulose Content |
80g/L |
|
Membrane Model |
Pro-Base series |
||
