Spin-bath regeneration in viscous fiber industry

• By a chemical reaction sodium sulfate and water develop out of soda lye and sulfuric acid. In viscose fiber factory the so-called spinbath is used up and diluted during the spinning process.
  In former times this spinbath was used only one time and after that drained as waste water which caused heavy environmental load and high operation cost. This made it necessary to regenerate the spinbath and feed it back into the process or to produce from a part of it a saleable product.
  Proprietary 14～16-stage flash evaporation technology reduce steam and cooling water consumption
  Our References
  

  10 lines, 14-stage flash evaporation project
  Fujian, China
  Capacity: 25 t/h one line water evaporation

  

  1 line, 14 stage evaporation project
  Nanjing, china
  Capacity: 25 t/h water evaporation

  

  5 lines, 14 stage evaporation project
  Capacity: 25 t/h water evaporation

Evaporation and crystallization

• If the solubility of the salt changes only a little at fluctuating temperatures the evaporation crystallization preferably find applications
  In this process a solution is crystallized by evaporating the solvent through the supply of heat.
  The special design of the evaporation chamber makes is possible to operate the evaporation crystallizer as classifying crystallizer.
  In this case the crystals are separated by classification according to size in a sedimentation zone. The coarse portion may be discharged through an extra outlet while the fine portion remains in suspension.
  Our References
  

  Evaporation and crystallization MgSO4 pilot-plant
  0.3t/h water evaporation

Mechanical vapor recompression

• If the cost of electric power are lower than the cost for the production of steam, it is advisable to operate the vapor compression by means of electric power
  Live steam is only needed for starting-up of the plant
  Besides single-stage radial compressors also multi-stage machines and axial compressors may find application
  Electricity consumption of below 40Kwh per ton water evaporation
  Low operation cost and high condensate quality
  Mechanical vapor recompression may also be applied in multi-stage evaporation plants and evaporation crystallization plants.

   

  Applications
  -evaporation of brine solutions in chlor-alkaline industry
  -concentration of brine solutions in salt industry
  -evaporation of aqueous solutions in chemical industry
  -recycling of special metals
  -concentration of waste water in environmental aspect
  -evaporation of milk, whey, sugar solutions etc. in food and beverages industry
  -concentration of solutions in petrochemical industry
  Our References
  

  Process flow diagram of MVR

  

  Titanium solution concentration with MVR to significantly reduce operating cost
  Capacity: 6.6t/h water evaporation

Crystallization and recycling of NaCl/KCl in aluminum salt industry

• Multi-stage evaporation process can be used
  Customize process solutions according to customer’s technical requirements
  Lab test can be conducted before scaling up to the industrial phase
  The lowest energy consumption achieved
  Maximize the heat recovery in the system
  Long service life
  Our References