Negative-pressure automatic feeding system and NO preparation system and method

A technology of automatic feeding and negative pressure, applied in chemical instruments and methods, methods of chemically changing substances by using atmospheric pressure, nitric oxide, etc., can solve problems such as introducing nitrogen

Pending Publication Date: 2022-07-22
中昊光明化工研究设计院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional acid hydrolysis method uses solid sodium nitrite to react with dilute sulfuric acid. When feeding the reactor, it is necessary to open the lid of the reactor. When the lid is opened, a large amount of external air enters the reactor, which leads to the introduction of more types of gases in the chemical reaction. Impurities, especially the inevitable introduction of nitrogen

Method used

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  • Negative-pressure automatic feeding system and NO preparation system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] use figure 1 The apparatus shown produces NO crude product.

[0057] The solid sodium nitrite was dissolved in water to prepare 18 L of a sodium nitrite solution with a concentration of 40 wt %, and the sodium nitrite solution was added to the first storage container 2 . 12 L of dilute sulfuric acid with a volume fraction of 25% was prepared by mixing 98% concentrated sulfuric acid with water, and adding the dilute sulfuric acid into the second storage container 3 . Use oil-free vacuum pump 4 to evacuate the 50L reactor 1 to a pressure of -0.088MPa. The sodium nitrite solution is sucked into the reaction kettle 1 by negative pressure. When the remaining volume of the solution in the first storage container 2 is 3L, the first liquid level gauge 6 controls the liquid level gauge automatic control valve 7 to close and stop feeding. The metering part 5 adds the dilute sulfuric acid into the reaction kettle 1. When the volume of the remaining dilute sulfuric acid in the se...

Embodiment 2

[0062] use figure 1 The apparatus shown produces NO crude product.

[0063] The solid sodium nitrite was dissolved in water to prepare 21 L of a sodium nitrite solution with a concentration of 35 wt %, and the sodium nitrite solution was added to the first storage container 2 . 15 L of dilute sulfuric acid with a volume fraction of 20% was prepared by mixing 98% concentrated sulfuric acid with water, and adding the dilute sulfuric acid into the second storage container 3 . Use the oil-free vacuum pump 4 to evacuate the inside of the 50L reactor 1 to a pressure of -0.086MPa. The sodium nitrite solution is sucked into the reaction kettle 1 by negative pressure. When the remaining volume of the solution in the first storage container 2 is 3.5L, the first liquid level gauge 6 controls the liquid level gauge automatic control valve 7 to close and stop feeding. The metering part 5 adds dilute sulfuric acid into the reaction kettle 1. When the volume of the remaining solution in th...

Embodiment 3

[0068] use figure 1 The apparatus shown produces NO crude product.

[0069]The solid sodium nitrite was dissolved in water to prepare 32 L of a sodium nitrite solution with a concentration of 42 wt %, and the sodium nitrite solution was added to the first storage container 2 . 23 L of dilute sulfuric acid with a volume fraction of 28% was prepared by mixing concentrated sulfuric acid with a mass fraction of 98% and water, and the diluted sulfuric acid was added to the second storage container 3 . Use oil-free vacuum pump 4 to evacuate the 100L reactor 1 to a pressure of -0.083MPa. The sodium nitrite solution is sucked into the reactor 1 by negative pressure. When the remaining volume of the solution in the first storage container 2 is 4L, the first liquid level gauge 6 controls the liquid level gauge automatic control valve 7 to close and stop feeding. The metering part 5 adds dilute sulfuric acid into the reaction kettle 1, and when the volume of the remaining solution in t...

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Abstract

The invention provides a negative-pressure automatic feeding system and an NO preparation system and method, and belongs to the technical field of chemical synthesis. The negative-pressure automatic feeding system comprises a mixing reaction system, a storage system, liquid level monitoring systems and a vacuumizing system, the mixing reaction system comprises a reaction kettle, the storage system comprises a first storage container and a second storage container, and the liquid level monitoring systems comprise a first liquid level monitoring system and a second liquid level monitoring system. And the vacuumizing system is hermetically communicated with the reaction kettle. According to the negative-pressure automatic feeding system provided by the invention, the vacuumizing system vacuumizes the interior of the reaction kettle to negative pressure, negative-pressure automatic feeding of a sodium nitrite solution can be realized by utilizing the liquid level monitoring system, covering feeding of the reaction kettle does not need to be opened, and gas impurities (such as nitrogen) in air are prevented from entering the reaction kettle 1 and products (such as NO) are prevented from overflowing; therefore, the purity of the generated crude product is improved. Moreover, the system provided by the invention is simple in structure and low in cost.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a negative pressure automatic feeding system, a NO preparation system and a method. Background technique [0002] The specialty gas industry emerged in the mid-1960s and is a class of chemical basic materials that use different purity standards according to specific uses. As one of the special gases, nitric oxide (NO) is widely used in electronic semiconductor, medicine, aerospace and other fields. [0003] At present, the preparation methods of NO mainly include acidolysis, ammonia oxidation and direct synthesis. Among them, acidolysis is the reaction of sodium nitrite and dilute sulfuric acid to prepare NO. It has the advantages of mild reaction conditions, high safety and low production cost. The most widely used synthetic route for the preparation of NO. [0004] In September 2003, the explosion of a nitric oxide distillation column in Ohio, USA, and two explosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J3/02B01J3/00C01B21/24
CPCB01J3/02B01J3/006C01B21/24
Inventor 夏山林刘禹含李子宽于枫柏宏斌郭宇姝任少科
Owner 中昊光明化工研究设计院有限公司
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