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Method and device for producing oxalic acid and sodium nitrite

A technology of sodium nitrite and oxalic acid, which is applied in the reaction of nitrous acid and carbon monoxide to prepare carboxylic acids, nitrogen oxides/oxyacids, etc., can solve the problems of difficulty in popularization and application, difficulty in recovering NO, etc., and achieve huge economic and social benefits. Effect

Inactive Publication Date: 2005-01-26
SHANGHAI HUAYI ENERGY CHEM
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Problems solved by technology

However, it is impossible for all the nitrogen oxides in the exhaust gas to be NO, and it is very difficult to recover NO in the CO stream
Therefore, said patent will bring a series of engineering technical problems, and the popularization and application of industrialization still has certain difficulties

Method used

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  • Method and device for producing oxalic acid and sodium nitrite
  • Method and device for producing oxalic acid and sodium nitrite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Obtain ammonia oxidation mixed gas by ammonia oxidation furnace 1, wherein:

[0047] NO: 16%; O 2 : 3.5%; N 2 : 56.5%; H 2 O: 24%;

[0048] Send the mixed gas into the oxidative esterification reactor 2, carry out oxidative esterification reaction with methanol aqueous solution and oxygen, the reaction temperature is 40°C, adjust the molar ratio of NO to oxygen to 1:0.25; the molar ratio of NO to methanol to 1:10 ; The mixed gas at the outlet of the oxidation esterification reactor 2 is mixed with CO with a content of 98%, and the mixed gas composition is: CH 3 ONO: 12%, CO: 15%, N 2 : 72%, N X o Y : 1%, then enter a coupling synthesis reactor 3, the temperature of the reaction is 140°C, and the reaction residence time is 1.5 seconds; the mixture is sent to the product condenser 4, and dimethyl oxalate is separated at a temperature of 110°C, and then conventional According to the method, oxalic acid and methanol are hydrolyzed in the hydrolysis reactor 8, and the...

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Abstract

The invention discloses a method and device for producing oxalic acid and sodium nitrite, wherein the device comprises at least an ammoxidation furnace, an oxidation esterification reactor, a coupling synthesis reactor, a product condenser, a hydrolysis reactor, a refrigeration condenser and an alkali lye absorbing system.

Description

technical field [0001] The invention relates to a method and a device for co-producing sodium nitrite from oxalic acid. Background technique [0002] The traditional production method for producing oxalic acid includes the following steps: carbon monoxide and sodium hydroxide react to generate sodium formate, sodium formate is pyrolyzed to obtain sodium oxalate, and then calcified or leaded and acidified to generate oxalic acid dihydrate crystals. [0003] This method is technically mature, but every production of 1 ton of oxalic acid dihydrate needs to consume 1.23 tons of sodium hydroxide, 0.61 tons of calcium hydroxide, and 0.87 tons of sulfuric acid (100%). The production process is long, and there is solid precipitation, intermittent operation, a large amount of three wastes need to be treated, which is easy to cause environmental pollution, and the production cost is relatively high, so this method has been gradually eliminated; [0004] Coupling oxo synthesis of oxal...

Claims

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Application Information

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IPC IPC(8): C01B21/50C07C51/10C07C55/06
Inventor 黄飙丁百全
Owner SHANGHAI HUAYI ENERGY CHEM
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