Evaporation and concentration process of sodium sulfite solution

A technology of evaporation concentration and sodium sulfite, which is applied in the direction of preparation, evaporation, chemical instruments and methods of alkali metal sulfite, can solve the problems of reducing product recovery rate and a large number of heat sources, and achieve good product quality, good operating flexibility, and energy efficiency. The effect of low consumption

Active Publication Date: 2013-03-13
株洲湘三特环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The air is heated by an indirect heating method - a hot air stove, which also requires a large number of heat sources
At the same time, the hot air is directly discharged after absorbing the water in the solution in the evaporator, and the concentrated solution in the evaporation tank is also directly discharged by the pump. Since a part of the solution will be entrained in the hot air, the recovery rate of the product will be reduced.

Method used

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  • Evaporation and concentration process of sodium sulfite solution
  • Evaporation and concentration process of sodium sulfite solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, the blower 1 is used to blow the low-temperature air into the heat exchanger 2 to exchange heat with saturated steam at a pressure of 4.5 kg. Generate hot air at 110°C, pass it into the concentration tank 3, and make countercurrent contact with the saturated sodium sulfite solution circulated by the circulation pump 6 in the concentration tank 3, and volatilize the moisture in the sodium sulfite solution into the hot air to form a 70°C saturated Humid air, saturated humid air enters the demist tower 4, and the solution entrained in the saturated humid air is removed through the fiber demister in the demist tower 4, and the solution is sent to the concentration tank 3 by the condensate pump 8 for re-concentration. The saturated humid air after defogging is emptied through the chimney 5. When the concentration of the sodium sulfite solution in the concentration tank 3 reaches a certain concentration, it is then transported to the cooling crystallizatio...

Embodiment 2

[0028] In this embodiment, the blower 1 is used to blow the low-temperature air into the heat exchanger 2 to exchange heat with saturated steam at a pressure of 12.5 kg. Generate hot air at 150°C, pass it into the concentration tank 3, and make downstream contact with the saturated sodium sulfite solution circulated by the circulation pump 6 in the concentration tank 3, volatilize the water in the sodium sulfite solution into the hot air, and form a temperature of 72°C Saturated humid air, saturated humid air enters the demist tower 4, in the demist tower 4, the solution entrained in the saturated humid air is removed through the wire mesh demister, and the solution is sent to the concentration tank 3 through the condensate pump 8 for re- The concentrated and demisted saturated air is emptied through the chimney 5. When the concentration of the sodium sulfite solution in the concentration tank 3 reaches a certain concentration, it is then transported to the cooling crystalliza...

Embodiment 3

[0030] In this embodiment, the blower 1 is used to blow the low-temperature air into the heat exchanger 2 to exchange heat with saturated steam at a pressure of 25 kg. Generate hot air at 220°C, pass it into the concentration tank 3, and make countercurrent contact with the saturated sodium sulfite solution circulated by the circulation pump 6 in the concentration tank 3, and volatilize the moisture in the sodium sulfite solution into the hot air to form 80°C saturated Humid air, saturated humid air enters the demist tower 4, in the demist tower 4, the solution entrained in the saturated humid air is removed through the baffle demister in the demist tower 4, and the solution is sent to the concentration tank 3 through the condensate pump 8 for re- The concentrated, demisted saturated humid air is emptied through the chimney 5. When the concentration of the sodium sulfite solution in the concentration tank 3 reaches a certain concentration, it is then transported to the coo...

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Abstract

The invention relates to an evaporation and concentration process of sodium sulfite solution. The invention adopts an evaporation and concentration method using hot air as a medium. The process comprises the following steps: first, conducting heat exchange between air and steam in a heat exchanger, and heating the air to 110-220 DEG C; then sending the heated air into a concentration tank, and absorbing water in the sodium sulfite solution to form saturated moist air; then demisting the saturated moist air, separating out solution and saturated moist air laden in the saturated moist air, recycling the solution to the concentration tank, and discharging air; and finally conducting cooling crystallization, centrifugation and drying on the solution subjected to recycling and concentration in the concentration tank to obtain a product, and recycling remaining liquid after centrifugation to the concentration tank. The process provided by the invention has advantages of consumption of a small amount of steam and little energy, hardly blocked equipment and no addition of a crystallization agent, so as to actually realize zero discharge of wastewater.

Description

technical field [0001] The invention relates to the technical field of solution evaporation and concentration, in particular to a process for evaporation and concentration of sodium sulfite solution. Background technique [0002] Sodium sulfite is a relatively mature inorganic chemical product in the inorganic salt industry, and is widely used in many industries: as a deoxidizer and bleaching agent in the printing and dyeing industry; as a developer in the photosensitive industry; as a reducing agent in the organic chemical industry; as a dehydration agent in the food industry Reducing agent for vegetables; used as reducing agent for producing cuprous cyanide in inorganic industry; used for boiler water treatment in water treatment; stabilizer for artificial fibers in leather industry; used as wood removal agent in paper industry, etc. There are also applications in the electronics industry, electroplating industry, spice industry, and dye industry. [0003] The traditional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/14B01D1/14
Inventor 李剑胜张佳栋
Owner 株洲湘三特环保有限公司
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