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Preparation process for preparing glyoxal based on catalytic oxidation of ethylene glycol

A preparation process and catalytic oxidation technology, which is applied in the preparation of carbon-based compounds, the preparation of organic compounds, catalysts for physical/chemical processes, etc. aldehyde production cost and other issues, to achieve the effect of eliminating the quality decline of polluting machines, improving comprehensive recycling rate, and improving reliability and stability

Inactive Publication Date: 2019-07-12
NINGXIA JOIE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Utilizing ethylene glycol to prepare glyoxal under catalyst conditions is the main process for preparing glyoxal at present, but it is found in actual production and preparation that currently in actual production, it is used to produce auxiliary materials such as raw materials and catalysts for preparation There are disadvantages of low connection efficiency between raw material heating treatment and catalyst heating pretreatment in different degrees. At the same time, the catalysts used are often mature products purchased directly, and then processed by secondary chemical reactions, heating and other processes. Mixed reaction with ethylene glycol raw materials to prepare glyoxal, which on the one hand causes the relatively high energy consumption of the catalyst processing operation, and on the other hand also easily causes the catalyst to cause ethylene glycol due to insufficient activity or low efficiency of secondary processing. The disadvantages of low production efficiency of dialdehyde, in addition, also lead to the serious loss of catalyst along with the production process in the current production process, and the relatively low recycling rate of catalyst, which further increases the production cost of glyoxal and easily leads to the production of glyoxal Aldehyde internal replacement of catalyst affects product quality

Method used

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  • Preparation process for preparing glyoxal based on catalytic oxidation of ethylene glycol
  • Preparation process for preparing glyoxal based on catalytic oxidation of ethylene glycol

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Effect test

Embodiment 1

[0021] Such as figure 1 Shown, a kind of preparation technology based on ethylene glycol catalytic oxidation prepares glyoxal, it is characterized in that: described preparation technology based on ethylene glycol catalytic preparation glyoxal comprises the following steps:

[0022] S1, raw material prefabrication, first heat ethylene glycol to 200°C to obtain ethylene glycol vapor and store it in an airtight storage tank with heat preservation, and the pressure of the ethylene glycol vapor in storage is 1.5 standard atmospheres; heat deionized water and Get water vapor with a temperature of 150°C, and store it in a closed storage tank for later use; then heat the mixture of oxygen and nitrogen to 150°C, and store it at a constant temperature and pressure at 1.5 standard atmospheric pressure for later use;

[0023] S2, configure the catalyst, while performing the S1 step operation, transport the nano-silver to the baking furnace with a flow rate of 1.5 m / s and a nitrogen gas f...

Embodiment 2

[0032] Such as figure 1 Shown, a kind of preparation technology based on ethylene glycol catalytic oxidation prepares glyoxal, comprises the following steps:

[0033] S1, raw material prefabrication, first heat ethylene glycol to 300°C to obtain ethylene glycol vapor and store it in an airtight storage tank with heat preservation, and the pressure of the ethylene glycol vapor in storage is 5 standard atmospheres; heat deionized water and The water vapor with a temperature of 300°C is obtained and stored in a closed storage tank for later use; then the mixture of oxygen and nitrogen is heated to 300°C, and kept at a constant temperature and pressure at 6 standard atmospheric pressure for later use;

[0034]S2, configure the catalyst, while performing the S1 step operation, transport the nano-silver to the baking furnace with a flow rate of 5 m / s and a nitrogen gas flow at a temperature of 600 ° C, and continue to stir and heat for 30 minutes, and then stop the nitrogen gas flow...

Embodiment 3

[0043] Such as figure 1 Shown, a kind of preparation technology based on ethylene glycol catalytic oxidation prepares glyoxal, it is characterized in that: described preparation technology based on ethylene glycol catalytic preparation glyoxal comprises the following steps:

[0044] S1, raw material prefabrication, first heat ethylene glycol to 150°C to obtain ethylene glycol vapor and store it in an airtight storage tank with heat preservation, and the pressure of the ethylene glycol vapor in storage is 3 standard atmospheres; heat deionized water and Get water vapor with a temperature of 260°C, and store it in a closed storage tank for later use; then heat the mixture of oxygen and nitrogen to 240°C, and store it at a constant temperature and pressure at 3 standard atmospheric pressures for later use;

[0045] S2, configure the catalyst, while performing the S1 step operation, transport the nano-silver to the baking furnace with a flow rate of 4 m / s and a nitrogen gas flow a...

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Abstract

The invention relates to a preparation process for preparing glyoxal based on catalytic oxidation of ethylene glycol. The preparation process comprises four steps: pre-preparation of raw materials, preparation of a catalyst, synthetic reaction and filtration and decolorization. Compared with the prior art, the preparation process has the advantages of high universality and simple operation; on onehand, the precision and efficiency of pretreatment and mixing reaction control of the raw materials, such as the ethylene glycol, and the catalyst can be effectively and greatly improved, and the reliability and stability of connection of material mixing pretreatment and mixing processing procedures are improved; on the other hand, the catalytic activity of the catalyst can be effectively improved, and the comprehensive recovery rate of the catalyst is greatly increased; and loss of the catalyst is prevented, and the phenomenon that a glyoxal product is polluted and has reduced quality due tothe loss of the catalyst is effectively avoided.

Description

technical field [0001] The invention relates to a preparation process of 2-propylimidazole, which belongs to the field of chemical industry. Background technique [0002] Utilizing ethylene glycol to prepare glyoxal under catalyst conditions is the main process for preparing glyoxal at present, but it is found in actual production and preparation that currently in actual production, it is used to produce auxiliary materials such as raw materials and catalysts for preparation There are disadvantages of low connection efficiency between raw material heating treatment and catalyst heating pretreatment in different degrees. At the same time, the catalysts used are often mature products purchased directly, and then processed by secondary chemical reactions, heating and other processes. Mixed reaction with ethylene glycol raw materials to prepare glyoxal, which on the one hand causes the relatively high energy consumption of the catalyst processing operation, and on the other hand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/38C07C47/127B01J23/89
CPCB01J23/8926C07C45/38C07C47/127
Inventor 沈健吴天平谢韦邱欣欣祁刚
Owner NINGXIA JOIE MATERIAL CO LTD
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