Device and method for removing trace water in organic solvents

Abstract

The invention discloses a device and method for removing trace water in organic solvents, wherein the water removal device includes a settling separator and a drying device, the middle part of the settling separator is provided with a solvent settling feeder, the upper part of the settling separator is provided with a settling solvent discharge port, and the bottom of the settling separator is provided with a settling water drain port; the middle part of the drying device is provided with a solvent drying feeder, the drying device is internally loaded with coarse salt, the solvent drying feeder is inserted into the coarse salt, the solvent drying feeder is connected with the settling solvent discharge port through a pipeline, the upper part of the drying device is provided with a drying solvent discharge port, and the bottom of the drying device is provided with a drying water drain port. The device utilizes the principle of water absorption of the coarse salt, large specific gravity of a brine solution and easier separation of the organic solvents and brine, realizes the removal of trace water in the organic solvents, has the advantages of simple operation, less equipment investment, small land occupation area, low energy consumption, easy treatment of produced wastewater, good water removal effect and the like.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a device and method for removing trace moisture in organic solvents. Background technique [0002] In the process of chemical production, some production processes often use organic solvents such as pure benzene and toluene, and the requirements for the moisture content of the solvent are very strict. It does not participate in chemical reactions and is only used as a carrier. In order to save production costs, the solvent after the reaction needs to be recycled. [0003] However, the used solvent has dissolved some inorganic and organic impurities in the system, and it needs to be purified before it can be reused. The classic process of solvent recovery and purification is to purify by water washing, distillation or rectification, but the solvent recovered by this method still contains a small amount of water, and some processes with special requirements still need ...

AI Technical Summary

Problems solved by technology

This process requires equipment such as stills, condensers, and reflux glass separators. The dehydration time is long, and a large amount of energy (steam and cooling water) is consumed. Moisture leads to failure to meet process requirements

[0005] Another process is to use a desiccant, such as adding a desiccant to the solvent to be dried, and then filter and separate to obtain a dry solvent. However, this process requires a large amount of desiccant at one time. The desiccant cannot be reused and is expensive; The operation is labor-intensive; the safety risk is high when filtering and processing the filter residue; and the used desiccant is dangerous solid waste, which is difficult to dispose of

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