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Method for preparing sodium carbonate and sodium sulfate

A technology of sodium carbonate and sodium sulfate, applied in chemical instruments and methods, alkali metal carbonates, alkali metal sulfites/sulfites, etc., can solve the problems of resource waste, energy consumption, secondary pollution, etc. Low production cost, simple steps, and the effect of eliminating pollution

Inactive Publication Date: 2008-07-23
梁志航
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology often adopts the method of evaporation and incineration to remove the pollution of cyclohexanone waste lye, but in the process of incineration, some harmful gases are produced, which is easy to cause secondary pollution, and it also consumes A large amount of energy has caused a waste of resources, and the coal has caused environmental pollution in the process of burning. Due to the multiplicity of pollution, the normal production of cyclohexanone has been caused.
Another treatment method is to discharge the waste lye into the sewage ditch after simple treatment, which not only causes a waste of resources, but also pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Heating the recovered cyclohexanone waste lye (1.2 specific gravity) to 40°C, then rapidly reducing the temperature to 0°C, and allowing it to crystallize naturally, the crystallization time is about 5 hours; the solution containing crystals is filtered, Pure sodium carbonate can be obtained; then the remaining filtrate is added to industrial concentrated sulfuric acid (the weight ratio of filtrate and concentrated sulfuric acid is 7: 1), the mixed solution is heated to 60°C, and then the temperature is allowed to drop to about 20-30°C ( Maintain for about half an hour), the mixed liquid appears solid-liquid phase separation, the solid phase and the liquid phase are separated, the separated solid phase material is dried to obtain sodium sulfate, and the separated liquid phase is repeated. The above steps are recycled.

Embodiment 2

[0019] Heating the recovered cyclohexanone waste lye (1.2 specific gravity) to 50°C, then rapidly reducing the temperature to 0°C, and then allowing it to crystallize naturally, the crystallization time is about 4 hours; the solution containing crystals is filtered, Pure sodium carbonate can be obtained; then the remaining filtrate is added to industrial concentrated sulfuric acid (the weight ratio of the filtrate to the concentrated sulfuric acid is 8:1), the mixture is heated to 70°C, and then the temperature is allowed to drop to about 30°C (maintain about About half an hour), the mixed solution appears solid-liquid phase separation, the solid phase and the liquid phase are separated, and the separated solid phase material is dried to obtain sodium sulfate, and the separated liquid phase is repeated for recycling.

Embodiment 3

[0021] Heating the recovered cyclohexanone waste lye (1.2 specific gravity) to 45°C, then rapidly reducing the temperature to 0°C, allowing it to crystallize naturally, and the crystallization time is about 5.5 hours; the solution containing the crystals is filtered, Pure sodium carbonate can be obtained; then the remaining filtrate is added to industrial concentrated sulfuric acid (the weight ratio of the filtrate to the concentrated sulfuric acid is 6: 1), the mixture is heated to 65°C, and then the temperature is allowed to drop to about 25°C (maintain about About half an hour), the mixed solution appears solid-liquid phase separation, the solid phase and the liquid phase are separated, and the separated solid phase material is dried to obtain sodium sulfate, and the separated liquid phase is repeated for recycling.

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PUM

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Abstract

The invention discloses a method for preparing sodium carbonate and sodium sulfate, which includes: (1) heat the waste alkali liquid of cyclohexanone and rapidly reduce the temperature to zero DEG C to realize the spontaneous nucleation; (2) filter the waste alkali liquid containing crystal substance, collect the filter residue to obtain the sodium carbonate, the filtrate is kept for future use; (3) add concentrated sulfuric acid into the filtrate obtained in the step (2), then heat the filtrate until solid phase and liquid phase split, separate the solid phase from the liquid phase and dry the separated solid phase substance to obtain the sodium sulfate. The invention can prepare pure sodium carbonate and sodium sulfate by taking the waste alkali liquid of cyclohexanone as raw material, and at the same time, the invention can eliminate pollution to the environment caused by the direct discharging of waste alkali liquid of cyclohexanone. The method provided by the invention is simple in procedure, needs no complicated equipment and is low in production cost, high in production rate; the purity of the prepared sodium carbonate and sodium sulfate is high and large-scale industrial production can be carried out.

Description

technical field [0001] The invention relates to a method for preparing sodium carbonate and sodium sulfate, in particular to a method for preparing sodium carbonate and sodium sulfate by using waste lye produced in the production process of cyclohexanone as a main raw material, and belongs to the field of chemical industry. Background technique [0002] Cyclohexanone is a colorless oily liquid with the molecular formula C 6 h 10 O, molecular weight 98.15, soluble in water, alcohol, ether and common solvents, with earthy aroma. As an important chemical raw material, cyclohexanone is a raw material for preparing nylon intermediates such as caprolactam and adipic acid. Commercial cyclohexanone is an excellent organic solvent with medium and high boiling point, which has excellent solubility and low volatility. It can dissolve polyvinyl acetate, polyurethane, polymethyl methacrylate and ABS resin, etc., and can also dissolve polystyrene, alkyd resin, acrylic resin, natural re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/24C01D5/00
Inventor 梁志航
Owner 梁志航