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Method and device for preparing glyoxylic acid by multistage reaction

A technology of multi-stage reaction and glyoxylic acid, which is applied in the preparation of carboxylate, chemical instruments and methods, and the preparation of organic compounds, etc., can solve the problems of large amount of nitric acid used and generation of waste gas, etc., and achieve the reduction of waste gas production and waste gas The effect of reduced yield and stable reaction system

Active Publication Date: 2014-06-25
HUBEI HONGYUAN PHARMA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0017] The purpose of the present invention is to overcome above-mentioned weak point, provide a kind of method for the preparation of glyoxylic acid by multistage reaction, solve the technical problem that nitric acid uses a lot in the preparation process of glyoxylic acid in the prior art, produces more waste gas

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  • Method and device for preparing glyoxylic acid by multistage reaction
  • Method and device for preparing glyoxylic acid by multistage reaction

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preparation example Construction

[0045] Correspondingly, the present invention also provides a device for preparing glyoxylic acid in the multistage reaction of the above-mentioned preparation method, comprising: a first reactor, a second reactor, a tail gas absorption tower and an induced draft fan connected in sequence; the first Both the reactor and the second reactor are provided with a jacket for containing steam or cooling water, and the first reactor and the second reactor are provided with a feed valve, an air inlet valve, and a jacket An upper port valve, a jacket lower port valve and a discharge valve; the first reactor and the second reactor are communicated through a waste gas conduit, and the device is also provided with the first reactor and the second reactor respectively. air filter connected to the air intake valve of the filter.

[0046] In a preferred version of the present invention, both the first reactor and the second reactor are provided with an air distributor and a liquid raw materia...

Embodiment 1

[0049] Embodiment 1 of the present invention provides a kind of device that multistage reaction prepares glyoxylic acid, as figure 1 As shown, the device includes: the first reactor 1, the second reactor 2, the tail gas absorption tower 3, the induced draft fan 4 and the air filter 5, wherein the first reactor 1, the second reactor 2, the tail gas absorption tower 3 and the induced draft fan 4 are connected sequentially, the first stage reaction is carried out in the first reactor 1, and the latter stage reaction is carried out in the second reactor 2; Or the jacket 16 of cooling water, when containing steam in the jacket 16, the reactor can be heated, when containing cooling water in the jacket 16, the reactor can be cooled; both on the first reactor 1 and the second reactor 2 A feed valve 7, an air inlet valve 8, a jacket upper valve 14, a jacket lower valve 13 and a discharge valve 15 are provided; the first reactor 1 and the second reactor 2 are communicated through a wast...

Embodiment 2

[0052] Example 2 of the present invention provides a method for preparing glyoxylic acid by multistage reaction, using the device in Example 1 to perform multistage preparation of glyoxylic acid, please refer to figure 2 As shown, the method includes:

[0053] (1) Start the induced draft and absorption system: open all the valves on the gas channel from the air filter 5 to the induced draft fan 4, start the induced draft fan 4 and the absorption liquid circulation pump of the tail gas absorption tower 3, so that the first reactor 1, the second reactor The series system composed of the second reactor 2, the tail gas absorption tower 3 and the induced draft fan 4 has air flow and generates a slight negative pressure (for example: -0.004MPa);

[0054] (2) The first reactor (A kettle) and the second reactor (B kettle) are fed separately: open the feed valve 7 of the first reactor 1, and put 2000kg of 40% glyoxal and 30% hydrochloric acid at one time 170kg; open the feed valve 7 ...

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Abstract

The invention relates to a chemical synthesis method for glyoxylic acid, and in particular to a method and a device for preparing glyoxylic acid by multistage reaction. According to the method disclosed by the invention, the tail gas generated by a first reactor is directly charged in a second reactor, and the effective constituents in the tail gas are recycled, thus a reaction system in the second reactor is more stable, the reaction is more complete, the conversion rate and yield are remarkably increased, and the unit consumption of the main raw material, that is, glyoxal is reduced; the tail gas is directly recycled, so that the recycling rate of the raw materials is increased, and the unit consumption of nitric acid and hydrochloric acid of the whole system, and the yield of waste gas are obviously reduced; the yield of waste gas is reduced and the contents of harmful substances in the waste gas are lowered simultaneously, so that the waste gas treatment steps are simplified.

Description

technical field [0001] The invention relates to a chemical synthesis method of glyoxylic acid, in particular to a method and device for preparing glyoxylic acid by multistage reaction. Background technique [0002] Glyoxylic acid is an important fine chemical raw material and intermediate, widely used in the synthesis of light industrial products such as spices, medicines, pesticides, papermaking, coatings, paints, leather and food additives. At present, the chemical synthesis methods commonly used in industry mainly include glyoxal nitric acid oxidation method, oxalic acid electrolytic reduction method, and maleic acid (anhydride) ozone oxidation method. Among them, the glyoxal nitric acid oxidation method has become a glyoxylic acid synthesis method commonly used by domestic and foreign manufacturers because of its relatively low cost and relatively mature technology. [0003] The nitric acid oxidation method of glyoxal is to selectively oxidize glyoxal with nitric acid u...

Claims

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Application Information

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IPC IPC(8): C07C59/147C07C51/27
CPCC07C51/27C07C59/147
Inventor 鲍应元徐双喜丰光俊邓支华晏浩哲
Owner HUBEI HONGYUAN PHARMA
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