Dashwood Astel Limited
Flat, 13/F., Blk4,

Kwun Tong Ind. Ctr.,436
Kwun Tong Road,

Hong Kong
www.dashwoodastell.com
europe@dashwoodastell.com
+380 57 771 41 85

 

Multi-effect water still

   
Summary  
??WFI preparation system is the key system for GMP. Multi-effect distillation unit is crucial equipment for WFI preparation system. The multi-effect distillation unit produced by Watertown using high temperature and pressure operation , to assure pyrogen-free WFI producing stable . Distilled water produced by Multi-effect distillation unit complys with requirements of U.S. , Europ ,Japan and China pharmacopoeia for WFI . Multi-effect distillation unit is the strongest product of Watertown , our goal is to design and manufacture the best distillation unit in China .

 

Technical characteristic
  • Material : puressure vessel body and pipeline connecting with distilled water , rebirth pure steam are 316L , sealed material is PTFE, other materials including frame are 304 .
  • Three stage separator : feed water in equipment can separate by film evaporation , gravity and special seporator .
  • Electro-polish : to assure WFI quality and increase the life of equipment , stainless steel surface treated by electro-polish .
  • Double tube sheets : The design for external pre-heater ,condenser and I effect evaporator are double tube sheets , comply with requirements of cGMP, can prevent the possibility of low sanitation level media polluting system .
  • Heat-exhange tube using seamless : the intensity and wearing property of seamless tube is better , can keep a good state in the process of machine , welding , expansion joint and contraction , to avoid any plant steam , feed water and cooling water leakage into clean distilled water and rebirth steam .
  • Three dimensional bend : To avoid welding , using stainless steel tube in the pipeline .
  • Automatic welding: To assure welding quality , make use of automatic argon protection orbit welding in the connection of pipeline and parts .
  • Heat insulation : For evaporator and pre-heater , using un-chlorine , un-asbestus mineral heat insulation , external covered by stainless steel .
  • Feed water pre-treatment : No expensive purified water equipment , deionized water or RO water which conductivity are less than 5μS/cm can as feed water .
  • Economic and energy-saving :Rebirth steam in each effect utilizes step by step , so the operating factor of plant steam is very high , has a obvious energy-saving effect . Along with the effects of evaporator increase , the effect are more obvious . At the same time , quantity of cooling water can decrease considerably .
  • Control system : to reach the different customer`s requirements , using PLC control technology . From the determine and distribution of pure steam quality to higher control , such as each media continuous regulation , storage system linkage , classification password control and evaporation quantity etc, we can check carefully .
  • Non-paper recorder : to record the actual producing situation using non-paper recorder.
  • Whole machine performance plant test : in the plant of whole machine test , according to decided procedure , test for the whole machine .

 

Working principle of MS-T series distillation unit
??Working flow chart of MS-T series distillation unit as following : Feed water is heating by plant steam in I effect evaporator , then enter into posterior each effect pre-heater , pre-heated by plant steam ; rebirth steam and distilled water are heating for them in the condensers ;In the top of evaporator , after water separator , enters evaporation tube uniformly distributed , becomes film type stream in the evaporation tube ; Because very thin, so after evaporation , can become rebirth steam very quickly , the feed water which are un-evaporated transport to the next effect , as the feed water , this process repeats on and on until the feed water in last effect are un-evaporated , drain as condensate ; The rebirth steam (evaporated feed water ), ascends in the evaporator spirally , enters pure steam pipeline as next effect pyrogen gets through middle and top special seperator ; In the evaporator , pyrogen of rebirth steam absorbed by feed water condenses distilled water ; the processes for each effect are same , distilled water of each effect and rebirth steam of last effect are collected by condenser , heating change with cooling water and feed water , after cooling , become distilled water ; On-line detection for conductivity , qualified distilled water as WFI output , unqualified drain
??After three times separation , feed water turns into rebirth steam which are clean .The first time evaporation , feed water enters evaporator , then flow , at the same time evaporates ;The evaporated feed water in the lower extreme of evaporator back turns , in the action of gravity , foreign matters separate in the under-part , this is the second separation time ; For the third time , the rebirth steam (evaporated feed water ) ascends in the evaporator spirally , separates in the middle and top special separator . The cooling water only gets through condenser , can drop temperature for distilled water produced by each effect and rebirth steam .Plant steam is heating for feed water in I effect evaporator and pre-heater , becomes condensate after absorbing pyrogen , then drain out of machine . A portion of air in feed water can not condense , called uncondensable air , according to the automatica control degree , they can exhaust by device in the top of evaporator.
  1. plant steam
  2. condensate drain
  3. concentrate drain
  4. cooling water out
  5. distilled water
  6. cooling water in
  7. feed water in
  8. uncondensable air exhaust

 

Working principle of MS-T series multi-effect water still
??Working flow chart of MS-T series distillation unit as following : Feed water is heating by plant steam in I effect pre-heater , then enters into posterior each effect pre-heater , pre-heated by plant steam condensate ; rebirth steam and distilled water are heating for them in the condensers ;In the top of evaporator , after water separator , enters evaporation tube uniformly distributed , becomes film type stream in the evaporation tube ; Because very thin, so after evaporation , can become rebirth steam very quickly , the feed water which are un-evaporated transport to the next effect , as the feed water , this process repeats on and on until the feed water in last effect are un-evaporated , drain as condensate ; The rebirth steam (evaporated feed water ), ascends in the evaporator spirally , enters pure steam pipeline as next effect pyrogen gets through middle and top special seperator ; In the evaporator , pyrogen of rebirth steam absorbed by feed water condenses distilled water ; the processes for each effect are same , distilled water of each effect and rebirth steam of last effect are collected by condenser , heating change with cooling water and feed water , after cooling , become distilled water ; On-line detection for conductivity , qualified distilled water as WFI output , unqualified drain .
??After three times separation , feed water turns into rebirth steam which are clean .The first time evaporation , feed water enters evaporator , then flow , at the same time evaporates ;The evaporated feed water in the lower extreme of evaporator back turns , in the action of gravity , foreign matters separate in the under-part , this is the second separation time ; For the third time , the rebirth steam (evaporated feed water ) ascends in the evaporator spirally , separates in the middle and top special separator .
??The cooling water only gets through condenser , can drop temperature for distilled water produced by each effect and rebirth steam .Plant steam is heating for feed water in I effect evaporator and pre-heater , becomes condensate after absorbing pyrogen , then drain out of machine . A portion of air in feed water can not condense , called uncondensable air , according to the machine type , they can exhaust by device in the top of evaporator.
  1. plant steam
  2. condensate drain
  3. concentrate drain
  4. cooling water out
  5. distilled water
  6. cooling water in
  7. feed water in
  8. uncondensable air exhaust

 

Difference between S series and T series
??Seporator mode : seporation mode of S series is very simple , but the mode for T series manufactured by Watertown .
??Product specification model range : when large , S type is better , see product type list .
??Pyrogen for pre-heater : the pyrogen for S series is water , but for T type is steam .

 

Type selection table for MS-T series multi-effect water stills
Model Capacity ( kg/h )

Working pressure

( 0.3MPa )

Workig pressure

( 0.6MPa )
3 4 5 6 3 4 5 6
MS100 T 100 100 - - 150 150 - -
MS300 T 300 300 - - 350 350 - -
MS500 T - 500 500 - - 750 750 -
MS750 T - 750 750 - - 1125 1125 -
MS1000 T - - 1000 1000 - - 1500 1500
MS1500 T - - 1500 1500 - - 2250 2250
MS2000 T - - 2000 2000 - - 3000 3000
MS3000 T - - 3000 3000 - - 4500 4500
MS4000 T - - - 4000 - - - 6000
MS5000 T - - - 5000 - - - 7500
MS6000 T - - - 6000 - - - 9000

 

Type selection table for MS-S series multi-effect water stills
Model Capacity ( kg/h )
Working pressure ( 0.3MPa )
3 4 5 6
MS100 S 100 100 - -
MS300 S 300 300 - -
MS500 S - 500 500 -
MS750 S - 750 750 -
MS1000 S - - 1000 -
MS1500 S - - 1500 1500
MS2000 S - - 2000 2000
MS3000 S - - 3000 3000