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Method for performing tubular continuous nitrification on naphthalene-2,7-disulfonic acid during production of H acid

A technology of disulfonic acid and disulfonic acid sulfuric acid, which is applied in the direction of sulfonic acid preparation and organic chemistry, can solve the problems of low production efficiency, uneven concentration distribution, low yield, etc., and achieve large production capacity and large heat transfer area , high heat transfer efficiency

Inactive Publication Date: 2012-01-18
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second method has no trisulfonation, no alkali fusion, less sulfur trioxide and inorganic salts, and no secondary environmental pollution caused by iron sludge and waste residue in hydrogenation reduction
[0004] Both methods have nitration reaction, and the technology used is kettle-type dripping intermittent reaction. The kettle-type intermittent nitration reaction technology has long reaction time, low production efficiency, uneven temperature distribution, uneven concentration distribution, and residence time distribution of materials in the kettle. Unevenness, local overheating in the kettle leads to many by-products, poor product quality, low yield, high production cost, and poor safety in the production process

Method used

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  • Method for performing tubular continuous nitrification on naphthalene-2,7-disulfonic acid during production of H acid
  • Method for performing tubular continuous nitrification on naphthalene-2,7-disulfonic acid during production of H acid
  • Method for performing tubular continuous nitrification on naphthalene-2,7-disulfonic acid during production of H acid

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Embodiment 1

[0023] The tubular continuous nitration method of naphthalene-2,7-disulfonic acid in the production of H acid includes:

[0024] 1. Prepare naphthalene-2,7-disulfonic acid sulfuric acid solution;

[0025] 2. Preparation of nitric acid and sulfuric acid mixture;

[0026] 3. Complete the nitration reaction in the nitration reactor.

[0027] Such as figure 1 As shown, the prepared naphthalene-2,7-disulfonic acid sulfuric acid solution and the nitric acid sulfuric acid mixture are continuously added to the tubular continuous nitration reactor 3 in proportion, while flowing, mixing, reacting, heat exchange, and the reactants are removed. The first step: control the reaction temperature 40~50℃, the reaction time is 60 minutes; control the total amount of sulfuric acid in the naphthalene-2,7-disulfonic acid sulfuric acid solution and the nitric acid sulfuric acid mixed solution, so that the adiabatic temperature rise of the reaction process is less than 160℃; H The equipment used in the pip...

Embodiment 2

[0029] The difference between the second embodiment and the first embodiment is that the tubular continuous nitration reactor 3 is equipped with a chemical packing Raschig ring.

Embodiment 3

[0031] The third embodiment is different from the first embodiment in that the tubular continuous nitration reactor 3 is a commercially available SV type static mixer.

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Abstract

The invention provides a method for performing tubular continuous nitrification on naphthalene-2,7-disulfonic acid during production of H acid, and relates to a production method of a compound, in particular to a method for producing 1,8-dinitronaphthalene-3,6-disulfonic acid by performing continuous nitrification on naphthalene-2,7-disulfonic acid in the preparation process of the H acid and mixed acid of nitric acid and sulfuric acid in a tubular reactor. By the method, the tubular continuous production of the nitrification of the naphthalene-2,7-disulfonic acid is realized, wherein the reaction temperature is between 35 and 120 DEG C and the reaction time is less than 120 minutes. The production process is high in safety, the consumption of raw materials is low, products have good quality and productive capacity is large.

Description

Technical field [0001] The present invention relates to a production method of a compound, in particular to 1,8-dinitronaphthalene-3,6-disulfonic acid prepared by nitration reaction of naphthalene-2,7-disulfonic acid in the preparation process of H acid Production methods. Background technique [0002] The main method for the production of traditional dye intermediate H acid is sulfonation to prepare the trisulfonation mixture and then nitrify. After denitration, it is neutralized with ammonia, and iron powder is used to reduce nitrate grade T acid to obtain amino T acid. After acid precipitation, filter and filter. Cake beating and neutralization, adding caustic soda for dehydration, heating alkali fusion, and acidic precipitation to release sulfur dioxide to precipitate H acid; someone proposed a new H acid synthesis route: Naphthalene and sulfuric acid are sulfonated to prepare naphthalene-2,7-disulfonate Acid, naphthalene-2,7-disulfonic acid for nitration reaction, the nitr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C309/40C07C303/22
Inventor 吴剑华
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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