Tail gas treatment unit for maq-me drying

Abstract

The invention discloses a tail gas treatment device for MAQ-ME (R-(+)-2-(4-Hydroxyphenoxy) drying. The tail gas treatment device is mounted at a tail gas outlet of a bipyramid rotary drier for MAQ-ME drying. Specifically, the tail gas treatment device comprises an oil-free vacuum pump, a depth condenser, a solvent receiver and a tail gas discharge condenser, wherein one end of the oil-free vacuum pump is connected with the tail gas outlet of the bipyramid rotary drier; a vacuum pump guide tube which is connected with the top part of the solvent receiver is arranged at the other end of the oil-free vacuum pump; the depth condenser is arranged on the vacuum pump guide tube; a tail gas discharge channel is formed in the other side of the top part of the solvent receiver; and the tail gas discharge condenser is arranged in the tail gas discharge channel. By utilizing the tail gas treatment device disclosed by the invention, air is prevented from entering the MAQ-ME drier, so that a product is effectively prevented from being oxidized, the product quality is improved, and the energy consumption of the product is reduced; and meanwhile moisture and methylbenzene evaporated from the product are treated, therefore the purity degree of the product is improved, the methylbenzene is recycled, and the pollution of a methylbenzene tail gas to the atmosphere is reduced.

Description

technical field [0001] The invention relates to a tail gas treatment device, in particular to a tail gas treatment device applied to MAQ-ME, which mainly belongs to the technical field of chemical equipment. Background technique [0002] Methyl R-(+)-2-(4-hydroxyphenoxy)propionate, the chemical name is MAQ-ME, the manufacture of MAQ-ME is completed through synthesis reaction, washing, layering, crystallization, centrifugation and other processes . After centrifugation, the product contains a certain amount of water and solvent toluene. The product quality requires that the water content is less than 0.3%, and the toluene content is less than 0.5%. Therefore, the product must go through a drying process to meet the quality standards. The original drying equipment is a tray-type atmospheric pressure box-type drying oven, which takes a long time to dry. Although the moisture and toluene content of the dried products can meet the requirements, the solvent toluene volatilizes in...

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Problems solved by technology

The original drying equipment is a tray-type atmospheric pressure box-type drying oven, which takes a long time to dry. Although the moisture and toluene content of the dried products can meet the requirements, the solvent toluene volatilizes into the atmosphere and causes air pollution, and the product loss is large. Some materials Blown into the atmosphere by the dehumidification fan, also causing air pollution; due to exposure to the air and long drying time, the product is easily oxidized, causing the appearance of the product to turn yellow

[0003] Improvements have been made in the prior art. A double-cone rotary dryer is used for drying, and the tail gas is extracted and discharged through a vacuum pipeline. However, the tail gas still contains part of toluene except water vapor, which will cause pollution to the atmosphere.

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