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Method of ozone oxidation synthesis glyoxylate monohydrate

A technology of monohydrate and ozone oxidation, which is applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve the problems of high yield, cumbersome steps, and large amount of catalyst, so as to improve the utilization rate and process Simple and effective in increasing the oxidation reaction rate

Inactive Publication Date: 2009-06-03
QINGDAO GUOLIN ENVIRONMENTAL TECHNOLOGY CO LTD
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Problems solved by technology

The process yield is high but the steps are cumbersome and the amount of catalyst is large

Method used

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  • Method of ozone oxidation synthesis glyoxylate monohydrate

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] see figure 1 The process flow diagram of the shown embodiment, the present embodiment adopts maleic anhydride as a raw material, and synthesizes glyoxylic acid monohydrate by ozone oxidation, and the specific process flow is as follows:

[0031] Step 1: adding raw material maleic anhydride to distilled water, and performing hydrolysis in a hydrolysis kettle to obtain a maleic acid solution with a concentration of 20-40%, preferably a solution concentration of 30%. During hydrolysis, heat with a water heater to keep the hydrolysis temperature at 60-80°C, if optional, the hydrolysis temperature is 70°C, and hydrolyze for 2-4 hours.

[0032] Step 2: Move the maleic acid solution into the reactor, install an aeration pan at the air inlet end of the reactor, and use the aeration pan to diffuse ozone / oxygen with an ozone concentration of 100mg / L The reacti...

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Abstract

The invention discloses a method of ozone oxidation synthesis glyoxylate monohydrate. The method comprises the following steps: raw material maleic anhydride is dissolved with water to obtain maleic anhydride solution with concentration of 20-40%; the oxygen with ozone is injected into the maleic anhydride solution as a reaction gas, the oxygen with the ozone carries out oxidation reaction with the maleic anhydride solution in a reaction kettle, and a product of glyoxylate and peroxide are obtained after the oxidation reaction; the solution after the reaction is obtained after hydrolysis of the peroxide, the solvent in the solution after the reaction is distilled by reduced pressure, the residual glyoxylate product is cooled to obtain the glyoxylate monohydrate. The glyoxylate monohydrate is synthesized in direct oxidation method, therefore the operation is simple, the processing steps is simple and both productive rate and purity of the product are over 98%.

Description

technical field [0001] The invention relates to a method for synthesizing glyoxylic acid monohydrate, in particular to a method for synthesizing glyoxylic acid monohydrate by ozone oxidation. Background technique [0002] Glyoxylic acid monohydrate, as a high-purity glyoxylic acid product, can be used as raw materials for medicine, automotive paint additives and raw materials for some fine chemical products. There are three main production methods of glyoxylic acid: glyoxal oxidation, oxalic acid electrolysis, and maleic anhydride ozone oxidation. At present, the relevant literature data on the process research on the maleic anhydride ozonation method or the use of it for industrial production are as follows: [0003] In 1903, Harries synthesized glyoxylic acid for the first time by direct ozone oxidation of maleic acid aqueous solution, and the utilization rate of maleic acid in this reaction was only 50%. Harries did not measure the amount of ozone absorbed in the reacti...

Claims

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Application Information

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IPC IPC(8): C07C59/153C07C51/25
Inventor 丁香鹏
Owner QINGDAO GUOLIN ENVIRONMENTAL TECHNOLOGY CO LTD
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