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Production process for preparing N-phosphonomethyl iminodiacetic acid

A production process, the technology of diglyphosate, which is applied in the production process of diglyphosate, can solve the problems of excess hydrochloric acid, etc., and achieve the effects of optimizing the environment, saving costs, and reducing heavy process wastewater

Inactive Publication Date: 2014-01-15
ZHEJIANG BAIKE KAIPU CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the production process, it is also the birthplace of heavy process wastewater, and a large amount of excess hydrochloric acid is produced in the production process. How to improve the process and reduce wastewater is the main topic of our research

Method used

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  • Production process for preparing N-phosphonomethyl iminodiacetic acid

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Embodiment 1

[0024] A production process for preparing diglyphosate, comprising dehydrogenating diethanolamine to form iminodiacetic acid disodium salt, and then condensing it with phosphorus trichloride and formaldehyde to obtain diglyphosate; specifically comprising the following steps:

[0025] ① Control the weight percent concentration of iminodiacetic acid disodium salt to 24%-28%, then add phosphorus trichloride under vacuum conditions, and the reaction temperature is 65°C-70°C, in which iminodiacetic acid disodium The mol ratio of salt, phosphorus trichloride is 1: 1.04-1.06;

[0026] ②Then add the iminodiacetic acid disodium salt that the weight percent concentration is 24%-28%, the amount of the iminodiacetic acid disodium salt added at this moment is 1. the iminodiacetic acid disodium salt in the step 1.5 times the amount;

[0027] 3. adding weight percentage concentration is 35%-40% formaldehyde to carry out condensation reaction again, and the amount of formaldehyde is 1.25-1....

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Abstract

The invention discloses a production process for preparing N-phosphonomethyl iminodiacetic acid. In the production process, due to the full utilization of hydrochloric acid generated in early phase reaction, the addition of outsourced hydrochloric acid is avoided, namely the condition of process reaction is optimized by canceling a process of adding the hydrochloric acid. In the production process, disodium iminodi(acetate) is charged in two batches, namely 1.04 to 1.06 moles of phosphorus trichloride is added into 1 mole of disodium iminodi(acetate) to react fully, then 1.5 moles of disodium iminodi(acetate) is added to ensure that solution has enough acidity, and formaldehyde is dripped to form the N-phosphonomethyl iminodiacetic acid. The production process is simple, the cost is saved, and waste water is reduced.

Description

technical field [0001] The present invention relates to a kind of production technology of bisglyphosate. technical background [0002] At present, there are two main process routes for the production of bisglyphosate: one is the glycine-dimethyl phosphite method, which is the earliest technology developed, and the technology is mature. It is currently the process route adopted by most production enterprises. The disadvantage is serious environmental pollution , requires a highly active catalyst; the second is iminodiacetic acid (IDA method), which is a process route for the production of bisglyphosate that we have developed in recent years, and its products are welcomed by foreign users. [0003] Patent No. ZL00116540.2 invention patent discloses a process for preparing bisglyphosate through iminodiacetic acid. The production process is a direct technology, which shortens the reaction steps and reaction time, simplifies the production process and equipment, and has the cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F9/38
Inventor 陈忠良
Owner ZHEJIANG BAIKE KAIPU CHEM
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