Preparation process for cresol red

A preparation process, a technology of cresol red, applied in the direction of organic chemistry, etc., can solve the problems of low processing and production yield, high consumption of raw materials, poor quality, etc., and achieve the effect of reducing production cost requirements

Inactive Publication Date: 2013-10-16
TAICANG HENGYI MEDICINE CHEM MATERIAL FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The cresyl red that adopts prior art to process and prepare, the raw material consumption of its preparation is very big and processing equipment equipment is expensive, processing and production yield is low, quality is poor, and its reaction process is also more complicated

Method used

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Embodiment Construction

[0018] A kind of preparation technology for cresol red of the present invention is described in detail below in conjunction with specific embodiment:

[0019] The invention provides a preparation process for cresol red, comprising the following steps,

[0020] Step 1, at first the mass ratio is 1:1-2:1-2.5 o-benzoylsulfonyl anhydride, o-benzoyl and no

[0021] Zinc chloride hydrochloride is used as the raw material, and then the reaction temperature is controlled at 100°C-110°C, the reaction time is 3h-4h, and hydrochloric acid and water are added while stirring slowly to obtain tiny particles.

[0022] Step 2: Filtrate and precipitate the tiny particles produced in Step 1 with warm water at 45°C-60°C.

[0023] Step 3. Heat and dry the filtered precipitate in step 2, then cool, add ether and benzene, stir slowly for 15m-30m, filter and dry, and finally obtain cresyl red.

[0024] The quality of raw material o-benzoylsulfonyl anhydride, o-benzoyl and anhydrous zinc chloride i...

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PUM

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Abstract

The invention specifically discloses a preparation process for cresol red, which belongs to the field of synthetic technology of indicators. The preparation process comprises the following steps: 1, with o-benzoyl sulfonic anhydride, o-benzoyl and zinc chloride anhydrous in a mass ratio of 1: 1-2: 1-2.5 as raw materials, controlling reaction temperature to be 100 to 110 DEG C and reaction time to be 3 to 4 h and adding hydrochloric acid and water with slow stirring so as to prepare a tiny particle; 2, subjecting the tiny particle prepared in the step 1 to filtration and deposition in warm water with a temperature of 45 to 60 DEG C; and 3, successively subjecting a sediment of filtration obtained in step 2 to heating, drying and cooling, adding diethyl ether and benzene, carrying out slow stirring for 15 to 30 m and carrying out filtration and drying so as to finally prepare cresol red. The preparation process for cresol red provided by the invention overcomes the problems of low efficiency and low purity of conventional processing and preparation technology, meets demands of middle and small-sized enterprises for synthesis technology and can rapidly and easily process and prepare cresol red with high purity.

Description

technical field [0001] The invention relates to the technical field of indicator synthesis, in particular to a preparation process for cresol red. Background technique [0002] As is well known, cresyl red (i.e. Phenol red or phenolsulfonylphthalein or phenolsulfonylphthalein) is a chemical reagent for acid-base testing, which produces a color change as the pH value of the solution changes during use, and is an indispensable synthetic reagent in the current chemical research field. [0003] The cresyl red that adopts prior art to process and prepare, the raw material consumption of its preparation is very big and processing equipment equipment is expensive, processing and production yield is low, quality is poor, and its reaction process is also more complicated and difficult to control, and then to a certain extent It also increases the input of the production cost of the enterprise, so how to improve the processing production efficiency and reduce the input of the product...

Claims

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Application Information

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IPC IPC(8): C07D327/04
Inventor 倪明前
Owner TAICANG HENGYI MEDICINE CHEM MATERIAL FACTORY
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