Method of recycling low-concentration nitric acid solution in calcium carbide furnace tail gas to ethylene glycol process

A technology of calcium carbide furnace tail gas and nitric acid solution, applied in the chemical industry, can solve the problems of a large number of catalysts, achieve high recycling rate, reduce steam consumption, and reduce alkali consumption

Active Publication Date: 2019-03-12
XINJIANG TIANZHI CHENYE CHEM +1
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  • Abstract
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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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  • Method of recycling low-concentration nitric acid solution in calcium carbide furnace tail gas to ethylene glycol process

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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 of recycling low-concentration nitric acid solution in calcium carbide furnace tail gas to ethylene glycol process. NO in cyclic gas a from an outlet of a cycle compressor of a DMO (dimethyl oxalate) synthesis system reacts with methanol and nitric acid in low-concentration nitric acid solution c from an MN (methyl nitrite) regeneration unit under the action of methanol steam tracing through a low-concentration nitric acid waste liquid recycling system so as to generate methyl nitrite and water. The problem is solved that dilute nitric acid from side reactionin methyl nitrite regeneration is difficult to recycle; the content of nitric acid in methyl nitrite is effectively reduced. The method has the advantages of high recycle rate of nitric acid, good economy and reasonableness, good technical feasibility 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...

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Application Information

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Patent Type & Authority Applications(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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