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Preparation method of sulfanilic acid by solid-phase process

A technology of p-aminobenzenesulfonic acid and solid-phase method is applied in the field of production and preparation of p-aminobenzenesulfonic acid solid-phase method, and can solve the problems of high energy consumption, production of fine chemical products, large water content in products, etc.

Inactive Publication Date: 2015-10-14
FUYANG SITONG CHEM ENG CO LTD
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Problems solved by technology

[0005] At present, most domestic enterprises adopt the conventional liquid-phase method for production, but the quality of the products produced by the liquid-phase method is poor, which cannot be applied to the production of fine chemical products, and the processing and baking time is long, energy consumption is large, sulfide, aniline Wastewater and exhaust gas discharges a lot, polluting the environment. Chinese patent application number 201310500142.X discloses a preparation method of p-aminobenzenesulfonic acid. The processing technology of this method is too simple, the reaction operation time is long, and the produced product has a large water content. It is still quite difficult to use in factory production

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  • Preparation method of sulfanilic acid by solid-phase process
  • Preparation method of sulfanilic acid by solid-phase process

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Embodiment Construction

[0010] Preparation technical scheme of the present invention is as follows, and it comprises the following steps:

[0011] 1. Salt-forming reaction: first pump sulfuric acid with a concentration of 93% into the high-level metering tank with a sulfuric acid pump, weigh 21.75 tons, add sulfuric acid into the sulfonation reaction kettle, and then use an aniline pump to pump the sulfuric acid with a concentration of 99%. Pump aniline into the aniline high-level metering tank, weigh 19.2 tons (the weight ratio of aniline and sulfuric acid is 1:1.1.33), open the bottom valve of the benzoan metering tank, slowly add aniline dropwise into the sulfonation reaction kettle of sulfuric acid, After the dropwise addition, mix and stir evenly, close the reaction vessel, use physical reaction to generate heat, raise the temperature to 170-180°C and continue stirring for 20 minutes to allow the sulfuric acid and aniline to fully react to generate aniline sulfonate. After the reaction, the anil...

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Abstract

The invention discloses a preparation method of sulfanilic acid by a solid-phase process, which comprises the following steps: carrying out salification reaction on aniline and sulfuric acid to generate aniline sulfonate, sulfonating, baking to obtain a sulfanilic acid crude product, pulverizing the crude product, dissolving, carrying out vacuum filtration, crystallizing, centrifuging, dehydrating, and carrying out microwave drying to obtain the sulfanilic acid refined product. The preparation technique is simple, saves the aniline dropwise addition operation, shortens the salification reaction time, and lowers the material reaction temperature, energy consumption and waste gas emission. The process water in production is recycled, so no wastewater is discharged, thereby reducing the environmental pollution.

Description

technical field [0001] The invention relates to a production process of p-aminobenzenesulfonic acid, in particular to a production and preparation method of p-aminobenzenesulfonic acid by solid-phase method. Background technique [0002] P-aminobenzenesulfonic acid is an important intermediate mainly used in dyestuffs, printing and dyeing auxiliaries, food pigments, spices, and pesticides. It can be used to produce Acid Orange II, Acid Bright Yellow 2G, Acid Medium Yellow Brown 4G, Acid Medium Dark Yellow GG, Direct Yellow GR, Reactive Brilliant Red K-2G and Reactive Violet K-3R, etc.; can also be used as additives in the manufacture of some products, such as dissolved salt B, fluorescent whitening BG, BBU, dust-proof salt H, etc. It can be used as pesticide and fungicide to prevent wheat rust. In addition, it is also an ideal raw material for medicine, building materials and other industries. For example, adding this product to cement can not only shorten the setting time,...

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Application Information

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IPC IPC(8): C07C309/46C07C303/04C07C303/44
Inventor 张杨所卞奎友龚亚慧
Owner FUYANG SITONG CHEM ENG CO LTD
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