Device for reducing content of dichloromethane in paraffin oil

Abstract

The invention discloses a device for reducing the content of dichloromethane in paraffin oil, and relates to the technical field of dichloromethane separation processes. The device comprises a decompression rectifying tower, one end of the decompression rectifying tower is communicated with a delivery pump through a pipeline; one end of the decompression rectifying tower is communicated with a heat exchanger through a pipeline; one end of the heat exchanger is communicated with a first vacuum pump through a pipeline; one end of the decompression rectifying tower is communicated with a first pressure sensor through a pipeline; one end of the first pressure sensor is communicated with the first vacuum pump through a pipeline; one end of the decompression rectifying tower is communicated witha nitrogen pipe; one end of the decompression rectifying tower is communicated with a nitrogen generating device through a nitrogen pipe; nitrogen is introduced into the decompression rectifying tower through the nitrogen generating device, the partial pressure of dichloromethane in a gas phase is reduced, meanwhile, the flowing speed of ascending gas flow is increased, dichloromethane in paraffin oil is continuously separated, the content of dichloromethane in the produced paraffin oil is effectively reduced, the concentration is reduced to 100 ppm or below, and recycling of the paraffin oil is facilitated.

Description

technical field [0001] The invention relates to the technical field of dichloromethane separation technology, in particular to a device for reducing the content of dichloromethane in paraffin oil. Background technique [0002] Dichloromethane is a colorless transparent liquid with a pungent odor similar to ether. Slightly soluble in water, soluble in ethanol and ether, it is a non-flammable low-boiling solvent, often used to replace flammable petroleum ether, ether, etc., a compound formed by replacing two hydrogen atoms in methane molecules with chlorine. Dichloromethane is miscible with most commonly used organic solvents, and can also be miscible with other chlorinated solvents, ether, and ethanol in any proportion. Dichloromethane can quickly dissolve in phenol, aldehyde, ketone, glacial acetic acid, triethyl phosphate, formamide, cyclohexylamine, ethyl acetoacetate. Pure dichloromethane has no flash point, and solvent mixtures containing equal volumes of dichlorometha...

AI Technical Summary

Problems solved by technology

Due to the high content of dichloromethane and other reasons, this part of paraffin oil cannot be reused, and it is often treated as waste liquid, such as figure 1 As shown, the dichloromethane content in the paraffin oil produced by this process is relatively high, and the concentration is as high as 500-1000ppm, which is not conducive to the recovery and utilization of paraffin oil. Therefore, it is necessary to develop a device for reducing the content of dichloromethane in paraffin oil. Technical problems that technical personnel in the field need to solve

Images