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Process for cleaning and recovering ammonia gas as byproduct of glyphosate

A glyphosate and ammonia technology, applied in the preparation/separation of ammonia, etc., can solve problems such as environmental pollution of glyphosate production tail gas, and achieve the effects of high recovery rate, good quality and environmental protection

Inactive Publication Date: 2009-12-23
NANTONG JIANGSHAN AGROCHEM & CHEM LIMITED LIABILITY
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for purifying and recovering the tail gas of the IDA glyphosate process using iminodiacetonitrile as the starting material, and the whole recycling process is environmentally friendly, can realize clean production, and completely solve the problem of glyphosate Environmental Pollution Problems of Production Tail Gas

Method used

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  • Process for cleaning and recovering ammonia gas as byproduct of glyphosate

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: A water-ring vacuum pump is used to provide ammonia gas delivery power, and the pressure is maintained at -0.01Mpa to -0.05Mpa. The ammonia gas is dried and purified by soda lime, and the method of bubbling and absorbing with an extension tube is used to obtain ammonia gas with a content of 30%. Back to the neutralization of glyphosate mother liquor.

Embodiment 2

[0022] Embodiment 2: A water ring vacuum pump is used to provide ammonia gas delivery power, and the pressure is maintained at -0.01Mpa to -0.05Mpa. The ammonia gas is dried and purified by calcium oxide, and the ammonia gas with a content of 60% is used as glyphosate mother liquor for spraying and absorption.

Embodiment 3

[0023] Embodiment 3: A water ring vacuum pump is used to provide ammonia gas delivery power, and the pressure is maintained at -0.01Mpa to -0.05Mpa. The ammonia gas is dried and purified by activated carbon, and then sprayed and absorbed with soft water through a packed tower to make 20% ammonia water.

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Abstract

The invention relates to a process for recovering ammonia gas with the content being not less than 20 percent in tail gas exhausted in a process of producing glyphosate by an iminodiacetic acid (IDA for short) method. The process comprises the following steps: after being collected, the ammonia gas enters an adsorption and drying system through a buffer tank and is sent out through a blower or a pump; subsequent working sections such as mother liquor neutralization, aqueous solution agent preparation, ammonification, and the like are carried out, and redundant ammonia gas is absorbed by water and prepared into ammonia water. The process not only solves the problem of environmental pollution of the production of the glyphosate, but also can greatly reduce the production cost of the glyphosate.

Description

technical field [0001] The invention relates to a method for purification, recovery and recycling of tail gas produced in the glyphosate synthesis process, specifically, the method relates to high-yield recovery and utilization of by-product ammonia from the tail gas produced by glyphosate production, and recycling to grass Glyphosate production itself or recycled ammonia. No secondary pollution is generated during the implementation of the method. Background technique [0002] The chemical name of glyphosate is N—(phosphonomethyl)glycine. At present, there are two main production processes in China: the alkyl ester method and the IDA method. These two processes can be divided into many synthetic routes according to the different raw materials and processes. . In recent years, on the basis of maintaining the development of the original dimethyl ester route, we have increased the research on the IDA glyphosate process. We have successively studied the diethanolamine route a...

Claims

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Application Information

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IPC IPC(8): C01C1/12
Inventor 薛健杜辉马文广沈书群张海滨华鹏
Owner NANTONG JIANGSHAN AGROCHEM & CHEM LIMITED LIABILITY
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