Diethanolamine dehydrogendting process of preparing imino diacetate

Abstract

The present invention relates to a diethanolamine dehydrogenating process for preparing imino diacetate. The preparation process adopts the technological scheme includes diethanolamine and alkali metal hydroxide as raw materials, reaction condition of 140-200 deg.C temperature and 0.9-1.2 MPa reaction pressure in gauge pressure, skeleton copper as main catalyst, Ni, Mo, Co and at least one of Cr, W, B, P, V, Ce, La and Cd as cocatalyst. Compared with the existing technology, the present invention has relatively high load of catalyst, and thus higher production capacity of the plant. The process may be used in the industrial production of preparing imino diacetate.

Description

technical field [0001] The invention relates to a method for preparing iminodiacetate by dehydrogenating diethanolamine. Background technique [0002] Iminodiacetate is mainly used as an intermediate in the production of synthetic herbicide glyphosate, a widely used chelating agent and a raw material for chelating ion exchange resins. For example, in the electroplating and chemical plating industries, iminodiacetate can be used in the preparation of chemical gold plating and trivalent chromium plating solutions. In the water treatment industry, iminodiacetic acid or its water-soluble salt cooperates with other chelates to chelate calcium ions and magnesium ions; a chelating agent synthesized from iminodiacetic acid salts - surface active compound , can be used as a scale inhibitor for heat exchangers in brine systems. By introducing iminodiacetic acid into different polymerization systems, chelating cation exchange resins with various us...

AI Technical Summary

Problems solved by technology

In this document, the highest yield of the product iminodiacetate is 98.7%, but the amount of catalyst used is relatively large. In terms of every gram of raw material diethanolamine, about 0.2 grams of catalyst is needed, that is, the catalyst load is low, which affects the production capacity of the device.