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Processing method for mother solution and solium sulfite solution in naphthol production

A technology of sodium sulfite and treatment method, applied in the preparation of alkali metal sulfite, neutralized water/sewage treatment, alkali metal sulfite/sulfite, etc., to increase economic benefits, reduce acid consumption and steam consumption. Effect

Active Publication Date: 2006-11-08
李阳 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no real feasible production process to replace it, and it is imminent to deal with this wastewater to solve environmental problems

Method used

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  • Processing method for mother solution and solium sulfite solution in naphthol production
  • Processing method for mother solution and solium sulfite solution in naphthol production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, in volume is 8m 3 Add 5 tons of naphthalenesulfonic acid sodium salt mother liquor to the dilution pot, slowly put the alkali melt (reinforced alkali 900kg / batch of ingredients) generated by the alkali fusion reaction into the dilution pot, stir with a stirrer, and use the 85°C dilution with 0.2MPa compressed air is sent to the plate and frame filter press for liquid-solid separation, and then 500 liters of sodium sulfite solution at 85°C is sent to the plate and frame filter press with compressed air to wash the filter cake, and then dried with compressed air. Obtain 1250kg of solid salt mixture, the main components of the solid are sodium sulfite, sodium sulfate and sodium naphthalenesulfonate, etc., which can be used in the production of water reducers, and the liquid after pressure filtration and the second boiling washing water in production are removed to the acidification pot for acidification.

Embodiment 2

[0026] Embodiment 2, in volume is 8m 3 Add 5 tons of sodium sulfite solution into the dilution pot, and slowly put the alkali melt (reinforced alkali 900kg / batch of ingredients) generated by the alkali fusion reaction into the dilution pot, stir with the stirrer, and send the dilution at 95°C to the plate with compressed air In the frame filter press, liquid-solid separation is carried out, and then 400 liters of sodium sulfite solution at 80 °C is sent to the plate and frame filter press with compressed air to wash the filter cake, and then dried with compressed air to obtain 1300 kg of solid salt mixture. The main component of solid salt is sodium sulfite, which accounts for about 91.5%, water accounts for 1.6%, and the rest is sodium sulfate and sodium naphthalenesulfonate, etc. This solid salt can be used to produce lignin, liquid filtered out and di Boil the washing water and go to the acidification pot together for acidification.

Embodiment 3

[0027] Embodiment 3, except naphthalenesulfonic acid sodium salt mother liquor, sodium sulfite solution can be made diluent, after being provided with filter washing process, still can adopt two boiling washing water to make diluent, isolate sodium sulfite. In a volume of 8m 3 Add 4.5 tons of second-boiled washing water into the dilution pot, slowly put the alkali fusion product (reinforced alkali 900kg / batch of ingredients) generated by the alkali fusion reaction into the dilution pot, stir with the stirrer, and then send the diluted product at 85°C with compressed air Separation of liquid and solid in the plate and frame filter press, and then use compressed air to send 500 liters of sodium sulfite solution at 75 °C to the filter press to wash the filter cake, and dry it with compressed air to obtain 450 kg of solid sodium sulfite salt, the main component of which is sodium sulfite , accounted for 92%, water accounted for 1.3%, and the rest were sodium sulfate and sodium nap...

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PUM

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Abstract

The present invention relates to method of treating mother solution and sodium sulfite solution in production process of naphthol including sulfonation, neutralization, liquid-solid separation, alkali fusion, acidification, boiling separation, drying distillation, crystallization and other steps. The present invention features the dilution after alkali fusion with the mother solution after neutralization and liquid-solid separation or the sodium sulfite solution after boiling separation and cooling and pressure filtering as the diluent; and the filtering and washing step set between the diluting step and the acidifying step to separate out solid salt. The present invention has the advantages of the utilization of high temperature heat of the alkali fusion matter for separating out sodium sulfite and other slats, lowered water, steam and sulfuric acid consumption, reduced naphthol loss and raised yield.

Description

technical field [0001] The present invention relates to a kind of production method of organic chemical product, more specifically, relate to the production method of naphthol product. Background technique [0002] Naphthol is produced by sulfonation and alkali fusion, including the production of 1-naphthol and 2-naphthol, collectively referred to as naphthol in this document, and its technological process consists of sulfonation, neutralization, liquid-solid separation, alkali fusion, dilution, acidification, Boiling separation, dry distillation, crystallization and other processes, the naphthalenesulfonic acid sodium salt mother liquor separated in the liquid-solid separation process after neutralization, hereinafter referred to as the mother liquor, the main components are sodium naphthalenesulfonate, sodium sulfate, sodium bisulfite , sodium sulfite, etc.; in the boiling separation process, that is, the sodium sulfite solution separated during the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C01D5/00C01D5/14C02F1/66
Inventor 李阳
Owner 李阳
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