- A method for preparing ethyl alcohol list isopropanolamines
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The invention relates to a preparation method of diethylene monoisopropanolamine. The preparation method comprises the following steps of (1) introducing an inert gas to replace air inside a reaction kettle into the reaction kettle; (2) premixing epoxy propane and diethanolamine, then adding to the reaction kettle, introducing the inert gas to keep the pressure inside the reaction kettle to 0.1-0.5 Mpa, stirring and mixing materials, then raising temperature, keeping the temperature, and reacting to obtain a diethylene monoisopropanolamine product. According to the preparation method disclosed by the invention, diethanolamine and epoxy propane are utilized as raw materials and the conventional way of taking water as a solvent is abandoned, and the materials are premixed, so that the viscosity and solidification point of the reacted materials are reduced; the fast progress of reaction is facilitated due to the uniform dispersion of the two materials in a reactor; in addition, under the condition of low alkane-amine ratio, the improvement of the utilization ratio of epoxy propane and the reduction of generation probability of side reaction are facilitated. The whole process has the advantages of low energy consumption, high material transformation rate, high product purity, stable quality and no wastes.
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Paragraph 0031; 0032
(2017/01/02)
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- Method for producing low-chroma diethanolisopropanolamine
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The invention discloses a method for producing low-chroma diethanolisopropanolamine. The method comprises the following steps: 1, adding diethanolamine and ammonia to a reaction container, uniformly stirring diethanolamine and ammonia, and heating the obtained mixture to 40-60 DEG C; and 2, continuously adding epoxypropane to the reaction container, and completely carrying out a reaction at a controlled reaction temperature under a controlled pressure in order to obtain the low-chroma diethanolisopropanolamine. The slightly high aldehyde content of epoxypropane causes the slightly high chroma of diethanolisopropanolamine, and ammonia added to diethanolamine makes formaldehyde, acetaldehyde, propionaldehyde and other aldehydes in the epoxypropane preferably react with ammonia, so formation of chromogenic substances is avoided, thereby the preparation method can be used for producing low-chroma diethanolisopropanolamine from epoxypropane with the aldehyde content exceeding standards. The preparation method has the advantages of simplicity in operation, convenience in preparation, low cost, effective reduction of the chroma of diethanolisopropanolamine, and suitableness for industrial large-scale production.
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Paragraph 0023
(2017/06/02)
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