MVR Evaporative Crystallization for Potassium Bicarbonate Evaporation
Potassium bicarbonate is an inorganic substance with the chemical formula of KHCO3, which has a colorless transparent monoclinic structure, the relative density is 2.17g/cm3, which is a stable substance in air. It is the material for producing potassium carbonate, potassium acetate and potassium arsenite.
Process
Mixed potassium bicarbonate ion exchange solution containing ammonium bicarbonate and potassium bicarbonate mother solution containing potassium carbonate to obtain mixed material solution; The preheat feed liquid is sent to a desorption self-carbonization tow for low-temperature desorption self-carbonization; The material liquid desorbed from the carbonization tower enters multi- effect evaporator in turn for treament. Separating the obtained solid-liquid mixture by a centrifuge to obtain potassium bicarbonate crystals and potassium bicarbonate mother liquor containing potassium carbonate. The potassium bicarbonate crystal is dried and screened by a dryer, and then packaged and put into storage; The potassium bicarbonate mother liquor containing potassium carbonate is sent to effect evaporator and the liquid storage tank espectively. This method can significantly reduce the energy consumption in the evaporation process of potassium bicarbonate, and improve or control the crystal size and product quality of potassium bicarbonate.
MVR evaporator components:
Evaporator:
The liquid material inside the evaporator heated by steam for evaporation. Choose different type evaporator according to different liquid material features.
Separator(crystallizer):
use to separate vapor and liquid, according to different liquid features choose different type separator(crystallizer), such as normal separator, gravity separator, special design separator (crystallizer ).
Vacuum system:
Use to keep the whole system vacuum degree, pump some air, fixed gas, liquid entrainment of gas from the evaporator, so as to obtain the whole system stable evaporation process.
Pump:
Use to transfer liquid and concentrated liquid. According to different liquid features choose different pumps, such as centrifugal pump, displacement pump,screw pump.
Compressor:
Use to compress secondary vapor to supply heating source, improve secondary vapor enthalpy. According to different flow and compression ratio choose different compressor, in the case of pressure rise increase, multistage compressor can be used in series.
Control system:
MVR Evaporation system control center, by regular motor speed, control valve,flow meter, temperature and pressure, to realize automatic evaporation, cleaning, stop operations and so on. Automatic alarm, automatic protection system is not damaged, keep dynamic balance.
Cleaning system:
Different liquid after period of evaporator, there maybe scaling phenomenon, general speaking, 99% of the scale can be removed by adding chemical solvent, and can use CIP clean in situ or disassemble to clean.
Performance Comparison for Different Evaporator
| Item | Single effect evaporator | multi-effect evaporator | TVR evaporator | MVR evaporator |
| Energy consumption | energy consumption is much higher than others, 1ton water will consume 1Ton steam in theory | comparatively energy conservation | Base on traditional multi-effect evaporator, one more effect added, but higher pressure steam driven needed | The most energy saving technology for evaporator, but 10-40kwh power consumption |
| Floor space | Small | large | large | small |
| Energy sources | steam & power, need steam pipe network and boiler | steam & power, need steam pipe network and boiler | steam & power, need steam pipe network and boiler, need high pressure steam. | electricity, don't need pipe network, all the close-loop circulation system |
| Automaticity | Semi automatic | Full automatic operation, continuous evaporation | Full automatic operation, continuous evaporation | Full automatic operation, continuous evaporation |
Picture
Part of Client List
| No. | User | Application | Evaporation Capacity | Qty |
| 1 | Xinhua PHARMACEUTICAL Shouguang Co., Ltd | Ammouium Sulfate MVR Concentration | 17t/hr | 1 |
| 2 | Jiangxi Tonghe Pharmaceutical Co., Ltd | Sodium Chloride MVR Evaporation Crystallization | 5t/hr | 1 |
| 3 | Jiangsu Changqing agrochemical Co., Ltd | Sodium Chloride MVR Evaporation Crystallization | 10t/hr | 1 |
| 4 | Shijiazhuang Haili Fine Chemical Co., Ltd | Sodium Chloride MVR Evaporation Crystallization | 2t/hr | 1 |
| 5 | Suzhou Keda environmental protection engineering Co., Ltd | Sodium Chloride MVR Evaporation Crystallization | 1t/hr | 1 |
| 6 | Shijiazhuang hejia health care products Co., Ltd | Sodium Chloride MVR Evaporation Crystallization | 10t/hr | 1 |
| 7 | Hubei taisheng chemical Co., Ltd | Disodium hydrogen Phosphate MVR Evaporation Crystallization | 7t/hr | 1 |
| 8 | He'nan Xintiandi Pharmaceutical Co., Ltd | Ammonium chloride MVR Evaporation crystallization | 5t/hr | 1 |
| 9 | Taixing Jinyun dyestuff Co., Ltd | Dye MVR Concentration | 3t/hr | 1 |
| 10 | Changhuasheng(Taixing)Lithium Battery Material Co., Ltd | Sodium Chloride MVR Evaporation Crystallization | 5t/hr | 1 |
| 11 | Jiujiang fuda industry Co., Ltd | Ammonium Sulfate Evaporation Crystallization | 28t/hr | 1 |
| 12 | Zhejiang Jinke Peroxide Co., Ltd | Saline-alkali Evaporation crystallization | 10t/hr | 1 |
| 13 | LLC TD HALMEK | Lithium hydroxide single effect crystallization system | 4t/hr | 1 |
| 14 | Zhejiang xinhecheng special material Co., Ltd | Sodium chloride + sodium acetate evaporation crystallization | 6t/hr | 2 |
| 15 | Jiangxi Brother Medicine Co., Ltd | Nicotinic acid three-effect evaporation concentration | 9t/hr | 1 |
| 16 | Zhejiang Gramineae Technology Co., Ltd | Sodium chloride evaporation crystallization | 3t/hr | 1 |
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