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Process for preparing sodium sulfonate 215

A technology of sodium sulfonate and naphthalenesulfonic acid, applied in the preparation of sulfonate, organic chemistry, etc., can solve the problems of long reaction time, complicated process, low yield, etc., and achieve the effect of reducing production cost

Inactive Publication Date: 2004-10-20
本溪市轻化工研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low content of the above-mentioned base material, that is, sodium 1-hydroxy-5-sulfonate, the above-mentioned process steps can only be used in the preparation process, and the process parameters in each step are relatively improved. The efficiency is low, the reaction time is long, and the additives used in each step are relatively large, which leads to the increase of the cost of the target product, complicated process, and low total yield.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0014] Embodiment: Get 44 grams of 2-aminonaphthalenesulfonic acid, add it into a 200ml glass bottle, and stir constantly to dissolve it, add ice cubes to the cold hydrazine to keep the temperature of the material in the flask at 0°C-5 ℃, then add 10 gram hydrochloric acid and drip concentration and be 15% sodium nitrite, and make the mol ratio between 2-aminonaphthalenesulfonic acid and hydrochloric acid, sodium nitrite be: 1: 5: 7; Reaction temperature is controlled at 10°C, the reaction time is about 4 hours, after the end of the reaction, continue for a period of time, and filter out the crystals to obtain 40 grams of 2-diazonaphthalenesulfonic acid. Put the crystallized 2-diazonaphthalenesulfonic acid into a 1000ml reaction bottle, then add 250ml of water and stir to dissolve it, add 5 grams of sodium hydroxide to the dissolved liquid, and start heating to make the temperature Keep it at 50°C-70°C, start to drop 200ml of sodium hypochlorite with a content of 20%, and let ...

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PUM

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Abstract

A process for preparing sodium sulfonate 215 from 2-aminosulfonic acid as basic material includes such steps as adding hydrochloric acid and sodium nitrite to said basic material, diazotizing to obtain 2-diazonaphthalenesulfonic acid, adding sodium hypochlorite to obtain 2-diazonaphthelenequinone crystals, reaction with fuming sulfuric acid under existance of chloroform, adding alkaline solution to neutralize to obtain 2-diazo-1-naphthalenequionone-5-sodium sulfonate. Its advantages include high output rate greater than 40% and low cost reduced by 50%.

Description

Technical field: [0001] The invention relates to a method for preparing 2-diazo-1-naphthoquinone-5-sodium sulfonate required for making photosensitizers. Background technique: [0002] 2-diazo-1-naphthoquinone-5-sodium sulfonate is widely used as an intermediate for synthesizing photosensitizers in printing and microelectronics industries. The PS plate photosensitive adhesive or electronic component micro Metal plate photoresist has very ideal performance indicators. However, the preparation process of this compound of 2-diazo-1-naphthoquinone-5-sodium sulfonate is comparatively complicated, such as the preparation method commonly used in the prior art is based on 1-hydroxyl-5-sulfonate sodium Got it. Since the content of common sodium 1-hydroxy-5-sulfonate on the market is relatively low, usually only about 40%, sodium nitrite should first be added for nitrosation during preparation, then sodium sulfite and hydrochloric acid should be added to reduce it, and finally Sodi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C303/32C07C309/45C07C309/53
Inventor 赵明杰唐英王强王崇徽郭承美李莉
Owner 本溪市轻化工研究所
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