A process for producing glyoxylic acid by oxidation
A technology of glyoxylic acid and oxidation method, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc. It can solve the problems of low glyoxylic acid content, difficulty in control, and running out of materials, and achieve high purity and simple equipment , the effect of high recycling rate
Active Publication Date: 2020-12-22
广东玖翼化工有限公司
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Problems solved by technology
Although the methods such as feeding air, high temperature and increasing the concentration of nitric acid in the reaction solution can randomly initiate the oxidation reaction, the randomly initiated oxidation reaction is in a state that is difficult to control, often leading to material running, explosion, etc., and the content of glyoxylic acid in the reaction product Very low, which mainly produces oxalic acid and carbon dioxide
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Embodiment
[0015] A kind of technique that oxidation method produces glyoxylic acid, the process of its reaction is as follows:
[0016] 1) The reaction triggers:
[0017] NaNO 2 +HNO 3 =NaNO 3 +HNO 2
[0018]
[0019] 2) Response maintenance:
[0020] 2NO+O 2 =2NO 2
[0021] NO+NO 2 +H 2 O=2HNO 2
[0022] 3HNO 2 →HNO 3 +H 2 O+2NO (nitrous acid is rapidly decomposed into NO and HNO by heating 3 );
[0023] It can be seen from the above that nitric acid oxidizes glyoxal to release nitric oxide, which combines with oxygen to form nitrogen dioxide, and the aqueous solution of nitrogen dioxide and nitric oxide forms catalytic nitrous acid, thus making The reactions continued in a steady stream. So what actually works is oxygen, and nitric oxide is always circulating in it as a carrier of oxygen. At this point, it is only necessary to continuously replenish the consumed oxygen to make the reaction run smoothly.
[0024] In the initial stage of the reaction, initiation i...
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The invention discloses an oxidation method based glyoxylic acid production process. The process includes steps: 1) adding glyoxal, nitric acid and hydrochloric acid into an oxidation kettle, heating,guiding nitric oxide generated in a nitric oxide generator into the oxidation kettle through an air blower, and starting reaction; 2) starting an air blower of a primary absorption tower to guide nitric oxide gas and trace nitrogen dioxide gas generated in the oxidation kettle into an oxidation recovery tank to generate nitrogen dioxide through complete reaction with added high-purity oxygen; 3)completely mixing nitrogen dioxide with steam brought out in reaction and added spray mist to obtain nitrous acid through absorption by water vapor, subjecting to cooling reflux into the recovery tankthrough a condenser, and pumping into the reaction kettle through a pump to participate in reaction again to form a cycle. The oxidation method based glyoxylic acid production process has advantagesthat nitrous acid can be continuously generated in a whole reaction process, and a whole production process is high in yield, quality and controllability.
Description
technical field [0001] The invention specifically relates to a process for producing glyoxylic acid by an oxidation method. Background technique [0002] In the reaction process of producing glyoxylic acid by oxidation of glyoxal nitric acid, a catalyst or initiator called sodium nitrite is usually added, and the effect of adding sodium nitrite is that sodium nitrite reacts with nitric acid in the reaction solution to produce nitrous acid (HNO 2 ), whose real catalyst is HNO 2 . However, if no catalyst is added in the experiment, the oxidation reaction of nitric acid to oxidize glyoxal cannot be initiated at 40-45°C. Although means such as feeding air, high temperature and increasing the concentration of nitric acid in the reaction solution can cause the oxidation reaction to randomly initiate, the randomly initiated oxidation reaction is in a state that is difficult to control, often leading to material running, explosion, etc., and the content of glyoxylic acid in the r...
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IPC IPC(8): C07C59/147C07C51/235
CPCC07C51/235C07C59/147
Inventor 杨卫红
Owner 广东玖翼化工有限公司