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Method for preparing methyl nitrite by utilizing reaction composite reinforcement

A technology of methyl nitrite and reaction, which is applied in the field of preparing methyl nitrite by using reaction compound strengthening, can solve the problems of low selectivity of methyl nitrite, high nitric acid content and high energy consumption, and achieves enhanced raw material utilization rate, The effect of reducing nitric acid content and environmentally friendly preparation

Inactive Publication Date: 2020-08-18
上海诺哈尔化工技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing methyl nitrite by means of reaction composite strengthening, so as to solve the problems of low selectivity of methyl nitrite in traditional methods, high nitric acid content in waste water, and high energy consumption

Method used

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  • Method for preparing methyl nitrite by utilizing reaction composite reinforcement
  • Method for preparing methyl nitrite by utilizing reaction composite reinforcement

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Experimental program
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Embodiment 1

[0024] The nitrogen oxide mixed gas 100NM3 / h is input through the first material pipeline 101, which contains N2 70%, NO 10%, CO 20%, through the flow regulating valve, the distribution ratio of the second material pipeline 102 is 70%, and the third The distribution ratio of material line 103 is 30%. Methanol is input at 12.8Kg / h through the fifth material pipeline 105, oxygen is input at 1.6NM3 / h through the fourth material pipeline 104, nitric acid is not input through the sixth material pipeline 106, and the seventh material pipeline 107 and the eighth material pipeline 108 of the circulating material pipeline are opened , to control the reaction temperature. Finally control the reaction temperature of the esterification reaction B to be 40°C and the pressure to be 0.4Mpa, and control the temperature of the nitric acid reduction reaction A to be 60°C and the pressure to be 0.41Mpa. After the stable reaction, the ninth material pipeline 109 cannot measure the oxygen content....

Embodiment 2 5

[0026] In this embodiment, the first step is the same as the above embodiment, except that the parameter ratio is changed. The parameters and experimental results are expressed in the form of Table 1.

[0027] Table 1

[0028]

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Abstract

The invention discloses a method for preparing methyl nitrite by utilizing reaction composite reinforcement. The method comprises the following steps: carrying out esterification reaction on oxide, oxygen and methanol, carrying out nitric acid reduction reaction on nitrogen oxide, nitric acid and methyl alcohol, and compositing the esterification reaction and nitric acid reduction reaction to reinforcing the preparation of the methyl nitrite, wherein by-product nitric acid after esterification reaction and excessive methanol after esterification reaction are used as raw materials for nitric acid reduction reaction. According to the invention, the reactions of preparing methyl nitrite by esterification reaction and preparing methyl nitrite by reduction of dilute nitric acid are compositelyreinforced; therefore, an inevitable by-product nitric acid generated by esterification reaction is used as a raw material for dilute nitric acid reduction reaction; in addition, excessive methanol isused as a raw material for subsequent dilute nitric acid reduction, dilute nitric acid and methanol are converted into industrially required methyl nitrite and harmless water, so that the raw material utilization rate of esterification reaction is enhanced, the content of nitric acid in waste liquid after reaction is reduced, and the treatment difficulty and treatment cost of subsequent waste liquid are reduced.

Description

technical field [0001] The invention relates to the technical field of chemistry and chemical engineering, in particular to a method for preparing methyl nitrite by means of reaction composite strengthening. Background technique [0002] At present, the main industrial use of methyl nitrite is to use methyl nitrite to produce dimethyl oxalate, and then to produce ethylene glycol through dimethyl oxalate. There are many methods for producing methyl nitrite in the prior art. For example, the Chinese patent "Method for Preparing Alkyl Nitrite" with publication number 1218032A discloses that the feed gas containing nitrogen-containing compounds is fully contacted with methanol in a distillation tower to generate methyl nitrite through esterification, but this method Since nitric acid is an inevitable by-product of this reaction, the selectivity of methyl nitrite is reduced, and the bottom liquid of the distillation tower contains a higher concentration of nitric acid wastewater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C201/04C07C203/00
CPCC07C201/04C07C203/00
Inventor 单文波肖招金汪俊唐大川倪菁华
Owner 上海诺哈尔化工技术有限公司
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