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Method for circulated utilization of mother liquor of alpho-naphthol, beta-naphthol ethyl naphthol production

A technology of ethyl naphthol and methyl naphthol, which is applied in the field of mother liquor recycling, can solve the problems of increased production consumption, high operating costs, and increased costs, and achieve the effects of reducing production water, reducing emissions, and reducing emissions

Inactive Publication Date: 2007-07-11
江苏华达化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because in this route, sulfonation neutralization and filtration to produce sulfonate sodium salt produce high COD mother liquor at the same time, each ton of product produces about 5-8 tons of this mother liquor wastewater, which is difficult to treat
At present, the common technologies for treating this wastewater include resin adsorption method, solvent extraction method, concentrated incineration method, most of which are difficult to operate
On the one hand, due to the large investment and high operating costs, the operating costs are high, and on the other hand, the commonly used methods cannot be used due to the difficulty in handling the new waste generated by the treatment.
And although the method mentioned in the invention patent CN1858010A (the treatment method of mother liquor and sodium sulfite solution in the production of naphthol) has utilized the mother liquor wastewater, there are two problems. Consumption increases, costs increase
The second is that the waste salt produced is a mixture of sodium sulfate and sodium sulfite containing organic matter, which cannot be really treated
Therefore, this method cannot realize industrial production

Method used

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  • Method for circulated utilization of mother liquor of alpho-naphthol, beta-naphthol ethyl naphthol production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, in the process of preparing naphthol by sulfonation alkali fusion method, in the dilution kettle of 8 cubic meters, add water 1000L in advance, slowly add the alkali melt that alkali fusion reaction finishes (being sodium naphthol ≥ 44% and sodium sulfite ≥ 35% alkali melt) 3000kg, stirred for half an hour, the temperature is 85-95 degrees, pumped into the filter kettle, and drained. Put 6000L of sulfonium salt mother liquor preheated to 45-55 degrees in three times into the filter kettle, wash three times (a small amount for multiple times is convenient to improve the effect), drain, and combine the mother liquor to the acidification kettle for acidification reaction, then boil to separate layers, dry and distill Obtain 1110 kilograms of products at last, filter cake 800 kilograms, sodium sulfite content 93.2%.

Embodiment 2

[0026] Embodiment 2, basic steps are the same as embodiment 1, change the water 1000L into 1500L in advance, obtain 1100 kilograms of products at last. The filter cake is 650 kg, and the sodium sulfite content is 94.2%.

Embodiment 3

[0027] Embodiment 3, the basic steps are the same as in Embodiment 1, the water added in advance is increased to 500L, and finally 1101 kg of product are obtained. The filter cake is 900 kg, and the sodium sulfite content is 92.2%.

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Abstract

The invention discloses a new circulating utilizing method of mother liquid in the methyl naphthol and beta-naphthol manufacturing course, which comprises the following steps: adding little water in the dilute stove before putting alkali fusing material; making solid sodium sulfite display flow crystal pattern; transmitting into filter autoclave; filtering; separating mother liquid through sulfonated sodium salt; transmitting into filter autoclave; washing; filtering; combining filtrate; transmitting into acidifying segment; entering subsequent course; obtaining the product; recycling the sodium sulfite to manufacture naphthol.

Description

technical field [0001] The invention relates to the preparation of naphthol, in particular to a new method for recycling the mother liquor produced in the production process of naphthol (methyl naphthol, ethyl naphthol) by using the sulfonated alkali fusion method. Background technique [0002] The commonly used sulfonation alkali fusion method to prepare naphthol is through sulfonation, neutralization, and filtration to obtain sodium sulfonate salt, and then undergoes alkali fusion, dilution, acidification, boiling and stratification, and dry distillation to obtain the product. Specific examples are as follows: [0003] (1) Sulfonation: Add 1145 liters (1096 kg) of molten naphthalene at a temperature of 115-120° C. into the sulfonation pot. After the naphthalene is added, the naphthalene is heated to 135-145° C., and then 504 liters (865 kilograms) of 98% sulfuric acid is added slowly and then quickly from the sulfuric acid metering tank to the sulfonation pot under stirri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/04C01D5/14C07C37/04C07C39/14
Inventor 徐光辉苏建华张延林陶勇
Owner 江苏华达化工集团有限公司
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