Method and device for separating, refining and purifying intermediate m-xylylene dicarbamate solution and application of intermediate m-xylylene dicarbamate solution

A technology of ethyl isoxylylene dicarbamate and solution, which is applied in the field of separation, purification and purification of ethyl isoxylylene dicarbamate solution of an intermediate, and can solve the problems of unmentioned methods of separation and purification, Influence and other problems, to achieve the effect of efficient recycling and improving product quality
CN114478321AActive Publication Date: 2022-05-13INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
INST OF PROCESS ENG CHINESE ACAD OF SCI
Publication Date
2022-05-13

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Abstract

The invention provides a method and a device for separating, refining and purifying an intermediate ethyl m-xylylene dicarbamate solution and application of the intermediate ethyl m-xylylene dicarbamate solution. The method comprises the following steps: sequentially carrying out flash evaporation, first rectification and second rectification on an XDC solution, carrying out first-stage washing, first-stage oil-water separation, first-stage evaporation, second-stage evaporation, second-stage washing, second-stage oil-water separation and dehydration treatment to obtain refined and purified XDC; according to the method, a series of separation processes are designed according to the properties of the XDC and impurities contained in the solution, so that the separation, refining and purification of the XDC can be safely and stably realized, the impurities in the XDC solution are thoroughly removed, the residual quantity of impurity ions and metal oxides in the product is less than 10ppm, and the product quality is improved; the method can also efficiently recover the carbonylation agent and the solvent for cyclic utilization, has certain economical efficiency, and is beneficial to industrial application.
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Description

technical field

[0001] The invention belongs to the technical field of compound separation and purification, and in particular relates to a method, device and application for separation, purification and purification of an intermediate m-xylylene diurethane solution. Background technique

[0002] Isocyanate is a special chemical with isocyanate (N=C=O) functional group, and is an important raw material for the production of polyurethane products. M-xylylene diisocyanate (XDI) belongs to aliphatic diisocyanate. XDI introduces methylene between the benzene ring and the isocyanate group, which prevents the influence of the benzene ring macromolecular conjugation effect on the –NCO group, making it The isocyanate group of XDI is inherently more stable, so its properties are close to those of aliphatic isocyanates. Compared with hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI) and p-phenylene diisocyanate (PPDI), XDI has better addition reactivity, and its adhesi...

Claims

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