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Preparation method of m-hydroxybenzaldehyde

A hydroxybenzaldehyde and temperature control technology, which is applied in the preparation of carbon-based compounds, organic compounds, chemical instruments and methods, etc., can solve the problems of difficult product quality control, difficult clean production, complex production process, etc., and achieve product The effect of stable weight control, easy product weight and simple production process

Active Publication Date: 2013-10-02
怀化泰通新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its production process of m-hydroxybenzaldehyde of prior art is complicated, and production cost is big, pollutes seriously, and it is difficult to accomplish clean production, and product quality is also difficult to control simultaneously

Method used

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  • Preparation method of m-hydroxybenzaldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of m-hydroxybenzaldehyde comprises an esterification section, a chlorination section, a distillation section, a hydrolysis section, a refining section and a drying section, and the specific steps are as follows:

[0023] (1) Esterification section

[0024] Put 400kg of m-cresol and 460kg of acetic anhydride into a 2000L glass-lined reactor by weight, and slowly raise the temperature. When the temperature in the pot reaches 130°C, heat preservation is started, and the temperature is kept at 130°C for 4 hours; At the end, atmospheric pressure distillation is carried out to collect the by-product acetic acid, and the acetic acid is put into storage after passing the analysis; then the open cooling is lowered to 90°C, the crude ester is pumped into the esterification distillation pot to be distilled, the mechanical vacuum pump is turned on, and the vent valve is closed to make the whole The distillation system is in a vacuum state, open the pumping va...

Embodiment 2

[0037] The preparation method of m-hydroxybenzaldehyde comprises an esterification section, a chlorination section, a distillation section, a hydrolysis section, a refining section and a drying section, and the specific steps are as follows:

[0038] (1) Esterification section

[0039]Put 500kg of m-cresol and 480kg of acetic anhydride into a 2000L glass-lined reactor by weight, and slowly raise the temperature. When the temperature in the pot reaches 130°C, heat preservation is started, and the temperature is kept at 135°C for 4.5 hours. At the end, carry out atmospheric distillation to collect the by-product acetic acid, and store the acetic acid after passing the analysis; then turn the cooling down to 95°C, pump the crude ester into the esterification distillation pot to be distilled, turn on the mechanical vacuum pump, close the vent valve, and make the whole The distillation system is in a vacuum state, open the pumping valve, pump the crude ester into the distillation p...

Embodiment 3

[0051] The preparation method of m-hydroxybenzaldehyde comprises an esterification section, a chlorination section, a distillation section, a hydrolysis section, a refining section and a drying section, and the specific steps are as follows:

[0052] (1) Esterification section

[0053] Put 600kg of m-cresol and 500kg of acetic anhydride into a 2000L glass-lined reactor by weight, and slowly raise the temperature. When the temperature in the pot reaches 130°C, heat preservation is started, and the temperature is kept at 140°C for 5 hours; At the end, atmospheric pressure distillation is carried out to collect the by-product acetic acid, and the acetic acid is put into storage after the analysis is qualified; then the open cooling is lowered to 100°C, the crude ester is pumped into the esterification distillation pot to be distilled, the mechanical vacuum pump is turned on, and the vent valve is closed to make the whole The distillation system is in a vacuum state, open the pump...

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Abstract

The invention relates to the technical field of m-hydroxybenzaldehyde, particularly to a preparation method of m-hydroxybenzaldehyde. The product is prepared by an esterification section, a chlorination section, a distillation section, a hydrolysis section, a refining section and a drying section. The raw materials and auxiliary materials of the product are easily available, the technological steps are simplified, pollutants are fewer, the product yield is up to more than 85%, the weight of the product is easy to control, and the product cost is reduced by about 20% compared with the past. The product can be used for making epinephrine and its derivatives, phenylephrine hydrochloride and the like in medicine; in the metal industry, the product can serve as a nickel plating brightener, and can be used for corrosion prevention and decoration of steel, copper and copper alloys, zinc die castings, aluminum alloys and the like; in the spice industry, the product can be directly used as a spice, or can be used for making spices after esterification, etherification and derivative reactions; and also, a small amount of the product can be used as a quantitative analysis reagent of sugar.

Description

technical field [0001] The invention relates to the technical field of m-hydroxybenzaldehyde, in particular to a preparation method of m-hydroxybenzaldehyde. Background technique [0002] m-Hydroxybenzaldehyde is a fine chemical product with a wide range of uses, and can be widely used in the production industries such as medicine, dyes, fungicides, spices, and photographic emulsifiers. However, the m-hydroxybenzaldehyde of the prior art has complex production process, high production cost, serious pollution, difficult to achieve clean production, and simultaneously the product quality is not easy to control. Contents of the invention [0003] The purpose of the present invention is to provide a method for preparing m-hydroxybenzaldehyde with simple production process, less pollution, clean production and easy control of product quality. [0004] In order to solve the existing problems of the background technology, the present invention adopts the following technical solu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/565C07C45/61
Inventor 储晓建
Owner 怀化泰通新材料科技有限公司
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