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Nitric acid reduction device

A nitric acid and shell technology is applied in the preparation of nitrite, chemical methods, chemical instruments and methods for reacting liquid and gas medium, etc. Easy operation and long service life

Inactive Publication Date: 2017-07-18
NINGBO JINYUANDONG PETROCHEM ENG TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this device can only deal with acid gas and cannot effectively utilize acid gas, so the structure of the device needs further improvement

Method used

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  • Nitric acid reduction device

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Embodiment Construction

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] Such as figure 1 As shown, the nitric acid reduction device of this embodiment includes a housing 1, and the housing 1 is provided with a liquid inlet, a liquid outlet, an air inlet and an air outlet, and the upper and lower sides of the housing 1 are sequentially arranged with N layers of packing layers 2, dripping devices 11 are arranged in the housing cavity between adjacent packing layers 2, and the dripping devices 11 are respectively connected with the circulating pump 3 outside the housing 1 through pipelines, and the feeding The gas port is located at the bottom of the bottom packing layer, the air inlet is connected to the NO gas inlet pipe 12, the gas outlet is located on the top of the housing 1, the gas outlet is connected to the exhaust pipe 13, and the gas outlet is connected to the top of the packing layer 2. A gas heat ...

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Abstract

The invention discloses a nitric acid reduction device, which comprises a shell, wherein a liquid inlet, a liquid outlet, an air inlet and an air outlet are formed in the shell; N packing layers are sequentially arranged in the shell up and down; a drop-leaching device is arranged in an inner cavity between two adjacent packing layers in the shell; the drop-leaching devices are connected with a circulating pump arranged outside the shell through pipes respectively; the air inlet is located in the lower part of the bottom packing layer; the air inlet is communicated with an NO gas inlet pipe; the air outlet is located in the top of the shell and is communicated with an exhaust pipe; a gas heat exchanger capable of cooling gas which passes through the packing layers is arranged in the inner cavity between the upper parts of the packaging layers and the air outlet; the liquid inlet is located in the shell between the gas heat exchanger and the packing layers; the liquid inlet is communicated with an inlet pipe capable of introducing mixed liquid of methanol and a nitric acid; the liquid outlet is located in the bottom of the shell and is communicated with the circulating pump through a pipe; and N is a natural number greater than 2. The nitric acid reduction device has the advantages of small occupied space and high nitric acid reduction efficiency, the reduced nitric acid can be utilized in cycle and a catalyst is not used.

Description

technical field [0001] The invention relates to the field of ethylene glycol preparation, in particular to a nitric acid reduction device used in the ethylene glycol production process. Background technique [0002] The current large-scale industrial coal-to-ethylene glycol process mainly uses alcohols and NO and NO 2 The reaction produces methyl nitrite (MN), and MN is oxidatively coupled on a Pd catalyst to obtain dimethyl oxalate (DMO), which is then catalytically hydrogenated to obtain ethylene glycol (EG). Among them, the methyl nitrite (MN) regeneration tower plays a key role in the whole process. In the current process, a part of nitric acid is usually added to the system to generate enough NO and NO 2 , the unreduced solution containing nitric acid needs further treatment to reduce and neutralize the nitric acid. In this process, improper control of temperature and concentration not only affects the process indicators, but also may cause explosion hazards. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J10/00C07C201/04C07C203/00
CPCB01J10/00C07C201/04C07C203/00
Inventor 项裕桥程义安刘太泽邵迪陈嘉梁
Owner NINGBO JINYUANDONG PETROCHEM ENG TECH
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