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Isatoic acid anhydride synthesis method

A technology of isatoic anhydride and synthesis method, applied in directions such as organic chemistry, can solve problems such as large amount of waste water, and achieve the effects of reducing sewage discharge, saving water resources, and reducing production costs

Active Publication Date: 2010-12-29
HEFEI XINGYU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The biggest disadvantage of this method is the large amount of waste water produced

Method used

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  • Isatoic acid anhydride synthesis method

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Embodiment

[0014] Group 1: Add tap water to the reaction flask to cool down to below zero, add 0.1mol of liquid caustic soda, then add 0.1mol of imine, stir for 10-20 minutes, start to add 0.1mol of sodium hypochlorite dropwise, after 1-2 minutes after the dropwise addition, start to drop Add hydrochloric acid to adjust the pH value, and control the pH value between 6.4 and 7.2. When the temperature and pH value no longer change, the process ends. Suction filtration to obtain isatoic anhydride is dried in an oven for 4 to 6 hours and weighed for recording.

[0015] Group 2: add recycled waste water once to the reaction flask and cool down to below zero, add 0.1mol of liquid caustic soda, then add 0.1mol of imine, stir for 10-20 minutes, start to add 0.1mol of sodium hypochlorite dropwise, and finish dropping within 1-2 minutes. Start to add hydrochloric acid dropwise to adjust the pH value, and control the pH value between 6.4 and 7.2. When the temperature and pH value no longer change, i...

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Abstract

The invention discloses an isatoic acid anhydride synthesis method comprising the following steps of: carrying out reaction on phthalimide, caustic soda liquid, sodium hypochlorite and hydrochloric acid in a tap water system to generate isatoic acid anhydride; carrying out reaction on the phthalimide, the caustic soda liquid, the sodium hypochlorite and the hydrochloric acid in a waste water recovery system to generate the isatoic acid anhydride, wherein the recovered waste water is the waste water generated by producing the isatoic acid anhydride by the reaction of the phthalimide, the caustic soda liquid, the sodium hypochlorite and the hydrochloric acid in the tap water system or the waste water recovery system. The isatoic acid anhydride synthesis method saves water resources, reduces the production cost and the sewage discharge and does not obviously influence the yield.

Description

technical field [0001] The invention relates to a method for synthesizing isatoic anhydride. Background technique [0002] Isatoic anhydride, also known as Etoic anhydride, English name Isatoic anhydride, is a very useful chemical intermediate, which can react with both electrophilic reagents and nucleophilic reagents. It and its homologues and derivatives are widely used in the synthesis of agricultural chemicals, dyes, pigments, fragrances, flavors, medicines, ultraviolet absorbers, foaming agents, flame retardants, preservatives, bleaching agents, fungicides and sanitation Disinfectants and other fine chemical products. Isatoic anhydride has a wide range of uses and is a very important intermediate. The simplest and commonly used production method is to react phthalimide with liquid caustic soda, sodium hypochlorite, and hydrochloric acid in a water system to obtain isatoic anhydride. The biggest disadvantage of this method is the large amount of wastewater generated. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D265/26
Inventor 何普泉姚海波周林赵国霞刘美盛
Owner HEFEI XINGYU CHEM