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Improved process for preparing 2-sodium naphthalenesulfonate in production of beta-naphthol

A technology of sodium naphthalene sulfonate and ethyl naphthol is applied in the directions of sulfonate preparation, organic chemistry, etc., and can solve the problems of high production cost, high loss rate of sodium naphthalene sulfonate, large waste water treatment volume, etc., and achieves reduction in treatment effect of cost

Inactive Publication Date: 2007-04-18
李阳
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Each ton of 2-naphthalenesulfonate sodium salt produces 3 tons of neutralization mother liquor. The amount of neutralization mother liquor is large, and the loss rate of naphthalenesulfonate sodium salt is high, resulting in a high consumption quota for the production of ethyl naphthol, a large amount of wastewater treatment, and high production costs.

Method used

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  • Improved process for preparing 2-sodium naphthalenesulfonate in production of beta-naphthol
  • Improved process for preparing 2-sodium naphthalenesulfonate in production of beta-naphthol
  • Improved process for preparing 2-sodium naphthalenesulfonate in production of beta-naphthol

Examples

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Embodiment 1

[0024] Example 1, using 2m 3 The pressure, temperature, stirring, and jacket heating in the operation of the sulfonation pot are consistent with the existing equipment for the production of acetol, except for specially specified conditions; 1211kg of 100% molten naphthalene at 120°C is added to the sulfonation pot , Heat to 140°C, add 878kg of 98% concentrated sulfuric acid within 45 minutes of the beginning of the reaction, keep it at 163°C for 2 hours, and add 201kg of anhydrous sodium sulfate preheated to 165°C evenly within 1.5 hours In the sulfonation pot, keep the reaction at 163°C for 45 minutes. The total acidity of the sulfonate is 18.39% and the free sulfuric acid is 5.25%. The product, the sulfonate, is recovered through the naphthalene blowing process to obtain 60kg of naphthalene, and the product is the naphthalene blowing. The material is sent to the neutralization pot, neutralized with the washing liquid of sodium naphthalenesulfonate produced in the previous produc...

Embodiment 2

[0025]In Example 2, except for special designation, the equipment and operating conditions were the same as in Example 1. 1,211 kg of molten naphthalene was added, stirring was continued at 145°C, and 926 kg of 98% concentrated sulfuric acid was added within 40 minutes of the beginning of the reaction. Sulfonate at 160°C for 2.5 hours, add 134kg of anhydrous sodium sulfate which has been fried to 140°C in 1 hour, and keep the reaction at 164°C for half an hour. The total acidity of the sulfonate is 20.7%. , Free sulfuric acid 5.5%, and then the naphthalene is blown to obtain 56kg of recovered naphthalene. The resultant is the blown naphthalene product is sent to the neutralization pot, neutralized with the washing liquid of sodium naphthalenesulfonate produced in the previous time for 1 hour, and then added to the front 300kg of the neutralized mother liquor was diluted in one production, and then sent to the cooling pot to cool for 3.5 hours. The temperature was controlled at 40°...

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Abstract

The present invention is one improved sodium beta-naphthalenesulfonate in ethyl naphthol producing process. During refined naphthalene sulfonating process, one kind of assistant is added to raise the sulfuric acid utilization to 50-65 %, raise the naphthalene sulfonating rate, lower the total acidity of the sulfonated matter, reduce the amount of generated neutralizing mother liquid, reduce the loss of sodium naphthalenesulfonate, raise product quality and yield, raise ethyl naphthol yield, reduce effluent and lower production cost. The said technology of the present invention may be used in available ethyl naphthol producing apparatus without needing significant altering.

Description

Technical field [0001] The invention relates to a production process of organic chemical products, more specifically, to a production process of acetonaphthol products. Background technique [0002] It is well known in the industry that acetonaphthol is 2-naphthol. Its production process includes sulfonation, hydrolysis, blowing naphthalene, neutralization, cooling, filtration, alkali melting, dilution, acidification, boiling, drying, distillation and other processes (science As mentioned in the Fine Organic Chemicals Technical Manual published by the publishing house in 1993), the total acidity of the sulfonate (referring to the product of the naphthalene sulfonation process) in the process directly affects the neutralization of the naphthalene product (referring to the product of the naphthalene blowing process). The amount of sodium sulfite solution added also determines the amount of the neutralized liquid phase, that is, the amount of the neutralized...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C303/32C07C309/35
Inventor 李阳
Owner 李阳
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