A method for recycling low-concentration nitric acid solution in the production of ethylene glycol from calcium carbide furnace tail gas

A technology of calcium carbide furnace tail gas and nitric acid solution is applied in the chemical industry, and can solve problems such as a large number of catalysts, and achieve the effects of high recovery rate, feasible process technology, and reduction of nitric acid recovery rate

Active Publication Date: 2021-09-03
XINJIANG TIANZHI CHENYE CHEM +1
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Problems solved by technology

These two methods have better results when dealing with low concentration nitric acid, but need to use a large amount of catalyst

Method used

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  • A method for recycling low-concentration nitric acid solution in the production of ethylene glycol from calcium carbide furnace tail gas

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Embodiment Construction

[0031] Refer to attached figure 1 , a method for recovery and utilization of low-concentration nitric acid solution in the production of ethylene glycol from calcium carbide furnace tail gas, from NO in the recycle gas a at the outlet of the recycle compressor in the DMO synthesis system and methanol and in the low-concentration nitric acid solution c from the MN regeneration unit Nitric acid, under the action of methanol vapor heat tracing, passes through the recovery and utilization system of low-concentration nitric acid waste liquid, and reacts to generate methyl nitrite and water.

[0032]Another implementation example is different in that the recycling system of low-concentration nitric acid waste liquid includes a nitric acid purification liquid fine filter (4), a nitric acid purification inlet and outlet heat exchanger (5), and a nitric acid purification tower feed tank (2) , nitric acid purification tower liquid circulation pump (3), nitric acid purification tower (1...

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Abstract

The invention relates to a method for recycling low-concentration nitric acid solution in the production of ethylene glycol from calcium carbide furnace tail gas. Methanol and nitric acid, under the action of methanol vapor heat tracing, pass through the recovery and utilization system of low-concentration nitric acid waste liquid, and react to form methyl nitrite and water. The invention solves the problem of difficult recovery of dilute nitric acid produced by side reactions in the regeneration of methyl nitrite, and effectively reduces the content of nitric acid in the regeneration of methyl nitrite. It has the advantages of high recovery and utilization rate of nitric acid, reasonable economy, feasible process technology and the like.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for recycling low-concentration nitric acid solution in the production of ethylene glycol from calcium carbide furnace tail gas. Background technique [0002] Ethylene glycol (EG) is an important raw material for organic synthesis. The traditional preparation method is produced by the "petroleum method". In recent years, due to rising crude oil prices, my country is a country that is "poor in oil, low in gas, and rich in coal". In recent years, the research and development of new processes for producing dimethyl ether, ethanol, ethylene glycol, multi-carbon olefins and low-carbon mixed alcohols from syngas has also attracted widespread attention at home and abroad. The process of producing ethylene glycol from syngas has been developed unprecedentedly. Our company combines the advantages of local resources, utilizes raw salt, coal and other advantageous resour...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C201/04C07C203/00
CPCC07C201/04C07C203/00Y02P20/10
Inventor 林涛海李刚刘敏单芙蓉陆俊刘景刚叶展邝勇
Owner XINJIANG TIANZHI CHENYE CHEM
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