Application of MVR (Mechanical Vapor Recompression) crystallization evaporator to industrialized production of anhydrous sodium sulphate

An evaporator and sodium sulfate technology, which is applied in the chemical industry, inorganic chemistry, alkali metal compounds, etc., can solve the problems of high production cost, high energy consumption, and high investment cost, and achieve energy saving, low evaporation temperature, and low operating cost. low effect

Inactive Publication Date: 2013-06-12
NAFINE CHEMICAL INDUSTRY GROUP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The evaporation of Yuanming powder mostly adopts multi-effect evaporation. The investment cost of this process is high, the energy consumption is high, and the production cost of the product is high.

Method used

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  • Application of MVR (Mechanical Vapor Recompression) crystallization evaporator to industrialized production of anhydrous sodium sulphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0015] Heat 1 ton of nitric solution containing 25% sodium sulfate and 0.3% sodium chloride (by mass percentage) to 95°C and pump it into the MVR (vacuum) crystallization evaporator, start the compressor, start to evaporate, and the secondary steam passes through the compression temperature Raise it to 110°C, send it to the heating chamber to heat the material, and keep the material in a boiling state. When concentrated to sodium sulfate supersaturated, began to discharge.

[0016] The specific process parameters are as follows:

[0017] Material name sodium sulfate solution Solvent water feed concentration 25% Concentration saturation concentration Total amount of feed 1 ton Evaporation temperature 90℃ Total evaporation 480Kg Average evaporation 120Kg / h average energy consumption 37.5KW / ton

Embodiment 2

[0019] Heat 10 tons of nitric solution containing 30% sodium sulfate and 0.3% sodium chloride (by mass percentage) to 90°C and pump it into the MVR (vacuum) crystallization evaporator, start the compressor, start to evaporate, and the secondary steam passes through the compression temperature Raise it to 105°C, send it to the heating chamber to heat the material, and keep the material in a boiling state. The secondary steam condensate heats the liquid nitric acid through the plate and frame heat exchanger, and the heated liquid nitric acid enters the evaporation chamber, and when it is concentrated to the supersaturated state of sodium sulfate, it is pumped into the crystallizer to start discharging.

[0020] The specific process parameters are as follows:

[0021] Material name sodium sulfate solution Solvent water feed concentration 30% Concentration saturation concentration Total amount of feed 10 tons Evaporation temperature 90℃ Tot...

Embodiment 3

[0023] Heat 30,000 tons of nitric solution containing 30% sodium sulfate and 0.3% sodium chloride (by mass percentage) to 90°C and pump it into the MVR (vacuum) crystallization evaporator, start the compressor, and start to evaporate, and the secondary steam is compressed The temperature rises to 105°C, and the material is sent to the heating chamber to heat the material to keep the material in a boiling state. The secondary steam condensate heats the liquid nitric acid through the plate and frame heat exchanger, and the heated liquid nitric acid enters the evaporation chamber, and when it is concentrated to the supersaturated state of sodium sulfate, it is pumped into the crystallizer to start discharging.

[0024] The specific process parameters are as follows:

[0025] Material name sodium sulfate solution Solvent water feed concentration 30% Concentration saturation concentration Total amount of feed 30000 tons Evaporation temperature 90...

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Abstract

The invention discloses application of an MVR (Mechanical Vapor Recompression) crystallization evaporator to industrialized production of anhydrous sodium sulphate, relates to an improvement to an evaporation technology and aims at solving the problem of high anhydrous sodium sulphate production cost due to high evaporation cost and high water consumption of enterprises at present. The application is technically characterized in that niter solution enters the crystallization evaporator at low temperature for concentration, secondary vapor which goes out from an evaporation chamber is compressed by a compressor, the pressure and the temperature are increased, the heat content is increased, then the secondary vapor is fed into a heating chamber and is used as heating steam to keep liquid materials in a boiling state, and the heating steam is condensed into water. Therefore, steam which is abandoned in the past is fully utilized, the latent heat is recovered and the thermal efficiency is improved. The MVR crystallization evaporator can fully utilize the latent heat of secondary steam, can operate at low temperature, is energy-saving, is simple to operate, does not produce any waste residues, waste gas and waste water, and does not cause pollution to the environment.

Description

technical field [0001] The invention relates to an evaporation process of sodium sulfate, in particular to the application of an MVR crystallization evaporator in the production of sodium carbonate. Background technique [0002] The evaporation of Yuanming powder mostly adopts multi-effect evaporation. The investment cost of this process is high, the energy consumption is high, and the production cost of the product is high. The new technology of MVR crystallization evaporator is an improved concentration technology proposed for multi-effect evaporation. Contents of the invention [0003] The present invention is mainly to solve the high cost of the five-effect evaporation of sodium sulfate and provide a low-energy-consumption new process and new technology, and is a production technology for the industrial application of MVR crystallization evaporators in sodium carbonate. To achieve the above object, the present invention is achieved through the following technical solu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00
CPCY02P20/10
Inventor 许涛程芳琴周新国荆小兵李胜苏刚
Owner NAFINE CHEMICAL INDUSTRY GROUP CO LTD
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