New process for producing glyoxal by using complex silver catalyst to oxidize glycol

A catalytic oxidation and ethylene glycol technology, applied in the preparation of organic compounds, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of oxidation furnace components that cannot meet large-scale production, short catalyst life, low catalyst activity and selectivity and other problems, to achieve the effect of low cost, less generation, and lower bed resistance

Inactive Publication Date: 2010-02-10
HUBEI HONGYUAN PHARMA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are several problems to be solved urgently in this process: (1) During the catalytic oxidation process, due to the low activity and selectivity of the catalyst, part of ethylene glycol breaks the C-C bond at high temperature and oxidizes to formaldehyde, and the formed formaldehyde is partially destroyed. Deep oxidation is carbon dioxide and water, and part is absorbed by water together with glyoxal, causes the content of formaldehyde ≥ 0.2% in the glyoxal product,

Method used

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  • New process for producing glyoxal by using complex silver catalyst to oxidize glycol
  • New process for producing glyoxal by using complex silver catalyst to oxidize glycol
  • New process for producing glyoxal by using complex silver catalyst to oxidize glycol

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Embodiment 1

[0017] Embodiment 1: The purification and impurity removal device before the oxidation furnace in the traditional production process equipment is removed, and the oxidation furnace is converted into a grid plate oxidation furnace integrating the purification and removal device, such as figure 2 , image 3 As shown, the oxidation furnace is composed of a heat exchanger, a grid support plate, a feed inlet and a discharge outlet. The upper and lower side walls of the heat exchanger 1 are respectively provided with a heat exchange medium outlet 6 and an inlet 7, and above it A grid-type support plate 2 is provided, and the support plate is covered with a composite silver catalyst, and a purifying and impurity-removing agent 3 is laid on the catalyst layer; The feed port 4 is connected to the discharge port of the ternary mixer through a pipe guide, and the discharge port 5 is connected to the cooling device.

[0018] Direct spraying of high-pressure steam, combined with far-infr...

Embodiment 2

[0019] Embodiment 2: except adopting Ag-P-Se / ceramic particle catalyst (ceramic particle accounts for 60% of catalyzer gross weight), other reaction conditions are with embodiment 1, the yield 72.0% of glyoxal, the selection of glyoxal Sex 78.0%.

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Abstract

The invention relates to a new process for producing glyoxal by using a complex silver catalyst to oxidize glycol. The process comprises the following steps: adopting a high-pressure steam-spraying and far-infrared combining heating mode to gasify glycol; uniformly mixing the gasified glycol, steam, preheated filtrated air and circulating air in a tertiary mixer before entering a grid-type oxidation furnace integrated with a feed gas-purifying and refining device and filled with an Ag-P-Se/ceramic catalyst; carrying out a catalytic oxidation reaction; rapidly quenching the reacted gas; sendingthe gas to an absorption tower for repeated absorption; and decoloring the gas to obtain a glyoxal product. The process uses the Ag-P-Se/ceramic catalyst with strong activity and has high glyoxal yield up to 85 percent and small impurity formaldehyde product; a grid-type supporting plate overcomes the defects of easily deformed and crack catalyst bed and decreases the resistance of the bed; and the process integrates the purifying and refining device and the oxidation furnace and adopts the high-pressure steam-spraying and far-infrared combining heating mode to gasify the glycol to save energy and shorten the process flows.

Description

1. Technical field [0001] The invention belongs to a preparation process of glyoxal, in particular to a new process for producing glyoxal by adopting ethylene glycol composite silver catalytic oxidation method. 2. Background technology [0002] Glyoxal, also known as oxalic acid aldehyde, is the simplest aliphatic dialdehyde. The glyoxal molecule contains two interconnected carbonyl groups, which can undergo addition or condensation reactions with alcohols, amines, amides, aldehydes, and hydroxyl-containing compounds, and can also react with protein-like animal glue, cellulose, polyvinyl alcohol, and Urea and other cross-linking reactions occur. Glyoxal reacts with a compound with a single nucleophilic center to generate a linear compound; reacts with a compound with a double nucleophilic center to generate a cyclic compound, especially a heterocyclic compound, making it widely used in textile printing and dyeing, building materials, leather, medicine, and pesticides. , na...

Claims

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Application Information

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IPC IPC(8): C07C47/127C07C45/38B01J27/14B01J8/02
Inventor 段小六尹国平丁一刚杜治平林建刚袁华邓支华刘华华
Owner HUBEI HONGYUAN PHARMA
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