Preparation method of preferential water permeable membrane and morpholine wastewater treatment and morpholine substance recovery method

Abstract

The invention provides a morpholine wastewater treatment and morpholine substance recovery method. The wastewater can come from a morpholine production process or a morpholine byproduct process. The method mainly comprises the steps of (1) rectifying morpholine wastewater under normal pressure to remove light components, cooling a heavy component I at the bottom of a tower, feeding the cooled heavy component I into a reduced pressure rectifying tower for rectification, extracting wastewater with extremely low COD content from the top of the tower, and extracting a heavy component II rich in morpholine substances from the bottom of the tower; (2) feeding the heavy component II into a membrane assembly provided with a preferential water permeable membrane for separation, and obtaining a morpholine substance-containing heavy component III of which the water content is lower than 0.5% on the interception side; (3) feeding the heavy component III into a morpholine refining tower for rectification, and extracting high-purity and low-chroma morpholine substances from the top of the tower. The method provided by the invention is simple in process flow, does not involve common solvents required by extraction or azeotropic distillation, and is low in energy consumption and environment-friendly, and morpholine obtained by separation is high in purity and low in chromaticity.

Description

technical field

[0001] The invention belongs to the technical field of chemical industry separation, and in particular relates to a method for treating morpholine wastewater and recovering morpholine substances. Background technique

[0002] With the rapid development of my country's fine chemical industry, morpholine, as an important intermediate in fine chemical industry, is widely used in rubber additives, medicine, pesticides, coatings, anti-corrosion and other fields. At present, there are many morpholine production processes and morpholine by-product processes. The characteristics of this process are that it will produce a large amount of waste water with high COD, high ammonia nitrogen and rich morpholine. The morpholine substances in the waste water are miscible with water and can form Homogeneous azeotrope, resulting in wastewater can not be directly distilled to separate morpholine, thus increasing the difficulty of the treatment of this type of wastewater. Theref...

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