Dehydration treatment method for triethylamine

Abstract

The invention relates to a method for dewatering triethylamine. The water- containing triethylamine is mixed with solution of base metal inorganic compound with its weight proportion being larger than 15% thoroughly, and gets triethylamine with water content being lower than 0.3% through separation. Said base matal inorganic compound comprises common salt compounds such as common salt or alkaline compounds such as caustic soda. The invention is characterized by simple process, good effect and suitability for industrial production. If the prepared triethylamine is treated with solid caustic soda and / or molecular screen, it can get higher- purity triethylamine with water content being 0.1%- 0.01%.

Description

technical field [0001] The invention relates to a dehydration treatment method for triethylamine containing water, which is particularly suitable for the purification treatment of recovered triethylamine in the industrial production process. Background technique [0002] Triethylamine is an important chemical raw material. Because it is a kind of volatile liquid component easily miscible with water at low temperature, the method of drying it in industrial production is mostly to absorb the contained moisture with sodium hydroxide (caustic soda). [0003] Taking the production of the herbicide glyphosate as an example, the alkyl ester method disclosed in documents such as DEOLSNO.P2942898.6 is a method that has been widely used in enterprises. The method is to heat and dissolve paraformaldehyde or formaldehyde in a methanol solvent containing triethylamine, then add glycine and dimethyl phosphite (or trimethyl phosphite) for condensation reaction, and then undergo hydrochlor...

AI Technical Summary

Problems solved by technology

Since the dehydration treatment of triethylamine is to mix it with sodium hydroxide in the form of solid feeding, it cannot be carried out in a closed system, and it can only be operated by opening the lid of the reactor to feed, so triethylamine will inevitably be in large quantities. Escape, not only damage the health of the operator, but also lead to great unsafe factors

On the other hand, the input of solid raw materials and the withdrawal of products also make the production only in intermittent batch operation mode, and it is difficult to realize continuous production

At the same time, the stirring during the dehydration process also makes the sodium hydroxide brittle into fine powder, which further increases the difficulty of post-treatment, and because the proportion of water content to be removed is relatively high, the amount of solid sodium hydroxide to be consumed is large, especially In large-scale production, the amount of sodium hydroxide required for this dehydration treatment is very surprising, and the sodium hydroxide solution after absorbing water is difficult to be further recycled and discarded because it contains a variety of impurity components

It not only consumes and wastes a large amount of sodium hydroxide, an important chemical raw material, but also greatly affects the production cost