Reduction purification technology for nitric acid in production of coal produced glycol

Abstract

The invention relates to a reduction purification technology of nitric acid in production of coal produced glycol. A coal produced glycol technology mainly comprises coal gasification, purification and separation, coupling reaction, regeneration reaction and hydrogenation reaction. According to the technology, a nitric acid purification system is arranged in rear of a regeneration technology of an original system (A); in the original system (A), after a gas phase material (g) from the top of a DMO removal tower is treated through the nitric acid purification system, the content of nitric acid in discharge liquor is smaller than 0.5 percent. The technology solves the problems in the prior art, and provides a nitric acid reduction purification technology which fundamentally solves the problem of reduction purification of nitric acid in production of coal produced glycol, reduces the nitrogen source loss and nitric acid consumption in coupling reaction, solves the problems, such as wastewater treatment, in a coal produced glycol project, and is good in equipment treatment capacity and energy-saving effect in the same operation condition and technical condition control, high in device reliability, convenient to operate, safe and reliable, and easy to maintain.

Description

technical field [0001] The invention relates to the technical field of coal-to-ethylene glycol, and is particularly suitable for the nitric acid reduction and purification process of the coal-to-ethylene glycol project to solve the problem of wastewater treatment. Background technique [0002] Ethylene glycol (EG) is one of the important raw materials in the organic chemical industry. It is mainly used in the production of polyester resin and antifreeze. It also has a small amount in unsaturated polyester resin, lubricants, plasticizers, nonionic surfactants and other fields application. At present, the production methods of ethylene glycol in the world mainly include petroleum route and non-petroleum route. The petroleum route has mature technology and is widely used. However, this method is subject to large fluctuations due to the influence of international oil prices, and has a large water ratio and high energy consumption. , the production cost is higher. According to ...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems existing in the prior art, to provide a method that fundamentally solves the problem of reduction and purification of coal-to-ethylene glycol nitric acid, reduces the loss of nitrogen source and consumption of nitric acid in the coupling reaction, and solves the waste water of the coal-to-ethylene glycol project. Under the control of the same operating conditions and process conditions, the equipment has good processing capacity and energy-saving effect, and the device has high reliability, convenient operation, safety, reliability, and easy maintenance without any catalyst. A nitric acid reduction purification process

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