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A kind of equipment and method for removing sodium sulfate in brine

A technology of sodium sulfate and brine, applied in the field of sodium sulfate equipment, can solve the problems of inconvenient transportation and storage, high energy consumption and input equipment costs, and achieve the effects of preventing scaling or crystallization, reducing energy consumption and reducing production costs.

Active Publication Date: 2017-10-10
SHANGHAI LYMAX ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Since Glauber's salt contains ten crystal waters, it will dissolve when the temperature exceeds 33°C, which is inconvenient for transportation and storage. If it is to be used, it must remove 10 crystal waters to make anhydrous sodium sulfate (yuanming powder), which requires Add a set of evaporation device for dehydration, the energy consumption and equipment cost of the whole system are relatively high

Method used

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  • A kind of equipment and method for removing sodium sulfate in brine

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example 1

[0055] The concentration of sodium chloride in brine is 200g / l, the concentration of sodium sulfate contained in brine is 65g / l, the pH value is 6.5, the lattice distortion agent is 10ppm, and the maximum operating pressure is 68bar. The concentration of sodium sulfate in the dope is 165g / l. After the dope enters the buffer tank 17 to remove the lattice distortion agent, the dope is heated to 57°C through the heat exchanger 19, and then enters the room temperature crystallizer 20 for normal temperature crystallization and precipitation. After the anhydrous sodium sulfate is dried by a centrifuge, it is directly packed into bags.

example 2

[0057] The concentration of sodium chloride in the brine is 230g / l, the concentration of sodium sulfate contained in the brine is 45g / l, the pH value is 7, the lattice distortion agent is 11ppm, and the maximum operating pressure is 60bar. The concentration of sodium sulfate in the dope is 135g / l. After the dope enters the buffer tank 17 to remove the lattice distortion agent, the dope is heated to 58°C through the heat exchanger 19, and then enters the room temperature crystallizer 20 for normal temperature crystallization and precipitation. After the anhydrous sodium sulfate is dried by a centrifuge, it is directly packed into bags.

example 3

[0059] The concentration of sodium chloride in brine is 200g / l, the concentration of sodium sulfate contained in brine is 65g / l, the pH value is 5.5, the lattice distortion agent is 10ppm, and the maximum operating pressure is 50bar. The concentration of sodium sulfate in the dope is 100g / l. After the dope enters the buffer tank 17 to remove the lattice distortion agent, the dope is heated to 57° C. through the heat exchanger 19, and then enters the room temperature crystallizer 20 without crystallization.

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Abstract

The invention discloses equipment for removing sodium sulfate in saline water. The equipment comprises a membrane concentration system and a normal-temperature crystallization system connected with the membrane concentration system, wherein the membrane concentration system is a closed-cycle membrane concentration system or an opened membrane concentration system; the normal-temperature crystallization system comprises a buffer tank, a delivery pump, a heat exchanger and a normal temperature crystallizer which are sequentially connected. The invention also provides a method for removing the sodium sulfate in the saline water by using the equipment. According to the equipment and the method disclosed by the invention, the sodium sulfate in the saline water is concentrated to be supersaturated; concentration polarization of the surface of a membrane element is reduced to be minimized by adjusting the flowing speed and the pressure of the surface of the membrane element; meanwhile, crystal lattices of the sodium sulfate are enabled to be distorted, so that scaling or crystallization of the surface of the membrane element is prevented; a concentrated solution is crystallized at normal temperature, and anhydrous sodium sulfate is directly obtained without freezing and evaporating, so that energy consumption is greatly reduced, and the production cost is reduced; in addition, low-energy-consumption operation, energy conservation and environmental protection are realized; an obtained product does not need to be subjected to secondary treatment and can directly serve as a transportable and sellable product.

Description

technical field [0001] The invention relates to a device and a method for removing sodium sulfate in brine, in particular to a device and a method for removing sulfate from light brine after electrolysis in the chlor-alkali industry. Background technique [0002] In the chlor-alkali industry, the main processes for electrolyzing sulfate radicals in light brine are barium method or calcium salt-chemical precipitation method and membrane concentration plus freezing process. The chemicals added by the chemical precipitation method are mainly barium salt and calcium salt. Barium salt has its own toxicity, which will cause great damage to the environment and people. The manual operation is intensive, and leakage will lead to secondary pollution and scaling in production. Blocking pipes and ionic membranes shortens the service life of ionic membranes, so many manufacturers are not using them at present. The process of adding calcium salt requires that the sulfate concentration of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/14C01D5/16
CPCC01D3/14C01D5/16Y02P20/10
Inventor 傅立德彭美桂
Owner SHANGHAI LYMAX ENVIRONMENTAL TECH CO LTD
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