A kind of method for continuously preparing alkanolamides

Abstract

The invention discloses a method for continuously preparing alkanolamide. The method comprises the following steps: (1) adding a catalyst into a reaction kettle by alkanolamine and an alkali metal compound, stirring and allowing a reaction to obtain an alkanolamine alkali metal catalyst; (2) introducing the alkanolamine, fatty acid ester, a dispersing agent and the alkanolamine alkali metal catalyst prepared in the step (1), which are used as raw materials for synthesis, into a dynamic mixer to be thoroughly mixed; (3) subjecting the mixed raw materials to film distribution through a liquid film distributor, and enabling a film to flow downwards along the inner wall of a falling-film synthesis reactor for a reaction to prepare an alkanolamide product. In the method, an alkanolamine alkalimetal compound is prepared in advance as the catalyst, so that the mixing time of the alkanolamine and a basic catalyst in a batch process is reduced; at the same time, the falling film reaction is adopted, so that the continuous production is realized, and the production efficiency of the alkanolamide is improved.

Description

technical field [0001] The present invention relates to a process for the continuous production of alkanolamide products. Background technique [0002] Alkanolamides are a class of nonionic surfactants with good surface activity and anionic properties. They are often used as foaming agents and thickeners in detergents. They have good adsorption to fibers and have antistatic effects. Feels good; and has good anti-rust properties, which can produce a good protective effect on steel at a low concentration. It is widely used in metal cleaning and metal processing formulations, personal care, oil field secondary flooding, fuel additives and other fields, and has broad market application prospects. [0003] At present, the production of alkanolamide products mostly adopts the batch production method of tank type. The general process of this method is to first stir and mix the alkanolamine and the basic catalyst, and then slowly add the fatty acid ester. The disadvantage of this p...

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Problems solved by technology

[0003] At present, the production of alkanolamide products mostly adopts the batch production method of tank type. The general process of this method is to first stir and mix the alkanolamine and the basic catalyst, and then slowly add the fatty acid ester. The disadvantage of this process is that the alkanolamine The mixing process with the basic catalyst takes a certain amount of time, especially when using a solid catalyst such as KOH, NaOH, because this type of catalyst dissolves in the alkanolamine for a long time, so it takes a long time to mix, although a liquid catalyst can be used Such as potassium alkoxide catalysts reduce the mixing time of this stage, but still need more than 30min mixing time to ensure that the catalyst is evenly mixed, and the use of liquid potassium alkoxide catalysts will also increase the cost of production; in the feeding stage of fatty acid esters, Because it is an exothermic reaction, and in order to control the side reactions, it is necessary to control the feed rate of the fatty acid ester, so a long feed time is required. In addition, the heating and cooling operations before and after production also require a certain production time. Therefore, the current kettle-type intermittent The production method is less productive

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