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Device and method for purifying yellow phosphorus tail gas and continuously synthesizing oxamide

A yellow phosphorus tail gas and purification device technology, which is applied in chemical instruments and methods, the preparation of organic compounds, and the preparation of carboxylic acid amides, can solve the problems of high cost of hydrofluoric acid, low product yield and purity, and low level of comprehensive utilization And other issues

Active Publication Date: 2015-05-13
SOUTHWEST RES & DESIGN INST OF CHEM IND
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AI Technical Summary

Problems solved by technology

At present, most of the yellow phosphorus tail gas in my country is directly burned and discharged, and the comprehensive utilization level is low, and the utilization rate is less than 10%.
The method for synthesizing ammonium oxalate with hydrocyanic acid as raw material is not high due to the high cost of hydrofluoric acid but the yield and purity of the product
At the same time, the whole process causes great pollution to the environment, so this method has not been applied industrially
Pyrolysis of ammonium oxalate or urea oxalate produces oxamide, with a yield of less than 50%, and the cost of pyrolysis raw materials is high, and there is no large-scale application
The focus of this patent is that all industrial raw materials are used to synthesize dimethyl oxalate, the quality is not easy to control, and the cost is high

Method used

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  • Device and method for purifying yellow phosphorus tail gas and continuously synthesizing oxamide
  • Device and method for purifying yellow phosphorus tail gas and continuously synthesizing oxamide

Examples

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Effect test

Embodiment 1

[0037] Such as figure 1 As shown, a device for continuously synthesizing oxamide through purification of yellow phosphorus tail gas includes a yellow phosphorus tail gas purification device, a carbon monoxide purification device, an oxalate ester synthesis device and an oxamide synthesis device connected in sequence.

[0038] The synthetic oxalate unit includes an oxalate synthesis reactor, an alkyl nitrite synthesis reactor and an oxalate storage tank; the CO gas obtained after the yellow phosphorus tail gas passes through the yellow phosphorus tail gas purification device and the carbon monoxide purification device React with the alkyl nitrite produced in the alkyl nitrite synthesis reactor in the oxalate synthesis reactor to obtain dialkyl oxalate, which is purified and enters the oxalate storage tank. The unit for synthesizing oxalate also includes a dehydration unit.

[0039] Described synthesis oxamide device comprises ammonia metering tank, oxamide synthesis reactor, ...

Embodiment 2

[0061]Dimethyl oxalate in Example 1 was replaced with diethyl oxalate. In order to promote the reaction between liquid ammonia and diethyl oxalate, it is necessary to increase the reaction temperature to 110° C. and the reaction pressure to 0.5 MPa (A) during the synthesis of oxamide in Example 1.

Embodiment 3

[0063] The liquid ammonia used in the synthesis of oxamide in Example 1 is replaced by ammonia water. In order to promote the reaction of ammonia water and dimethyl oxalate, the reaction temperature in the synthesis process of oxamide in Example 1 needs to be increased to 85°C, and the reaction pressure constant.

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Abstract

The invention relates to a device and a method for synthesizing oxamide, and specifically relates to a device and a method for purifying yellow phosphorus tail gas and continuously synthesizing oxamide. The invention relates to the technical fields of chemical engineering, catalysis, chemical fertilizer and environment protection. The device provided by the invention comprises the sequentially connected components which are a yellow phosphorus tail gas purification device, a carbon monoxide purification device, an oxalate synthesis device and an oxamide synthesis device. The method comprises the steps of purifying yellow phosphorus tail gas, purifying CO from purified tail gas, synthesizing oxalate from CO, and synthesizing oxamide through oxalate ammonolysis. According to the invention, a complete set of process rout for continuously producing and synthesizing high-purity oxamide with the yellow phosphorus tail gas as a raw material is established. The device and the method are economical and environment-friendly.

Description

technical field [0001] The invention relates to a device and method for synthesizing oxamide, in particular to a device and method for continuously synthesizing oxamide through purification of yellow phosphorus tail gas, and belongs to the technical fields of chemical industry, catalysis, chemical fertilizer and environmental protection. Background technique [0002] my country is the world's largest producer of yellow phosphorus, with a total production capacity of about 1.8 million tons, accounting for more than 90% of the world's total. Yellow phosphorus is a resource-based, high material consumption, high energy consumption, and high pollution industry. For every ton of yellow phosphorus produced, the by-product is about 2850 m 3 Electric furnace tail gas, yellow phosphorus tail gas contains about 90% carbon monoxide (see Table 1 for typical composition), which is a valuable chemical raw material. At present, most of the yellow phosphorus tail gas in my country is direc...

Claims

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Application Information

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IPC IPC(8): C07C233/56C07C231/02C07C231/00C07C231/24
Inventor 李扬朱小学王科
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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