A device and process for preparing 2,4,6-tribromophenol with gaseous bromine

Abstract

The invention discloses a device for preparing 2,4,6-tribromophenol by using gas bromide and a technology thereof. The device comprises a chemical reaction kettle, wherein the chemical reaction kettle is communicated with a bromine vaporizing kettle through an after-vaporization bromine pipeline; a jacket is arranged outside the bromine vaporizing kettle and communicated with a steam pipeline; one end of the after-vaporization bromine pipeline is communicated with the upper end of the bromine vaporizing kettle; the other end of the after-vaporization bromine pipeline is inserted to the bottom of the chemical reaction kettle; the chemical reaction kettle is also communicated with a solid phenol pool through a pipeline; a pump is arranged on the pipeline; and the solid phenol pool is also communicated with the steam pipeline. The liquid bromide is heated and vaporized by steam to realize bromination in the reaction between phenol and ethyl alcohol; the bromine is effectively purified after being vaporized; impurities in the liquid bromide are removed in the vaporization process of the liquid bromide, and the high purity of the reacted 2,4,6-tribromophenol product is ensured.

Description

technical field [0001] The present invention relates to a device and its preparation process related to 2,4,6-tribromophenol, in particular to a device and its process for preparing 2,4,6-tribromophenol with gaseous bromine, which belongs to chemical products The field of production technology. Background technique [0002] 2,4,6-Tribromophenol is a reactive flame retardant with high bromine content. It is mainly used in the production of high molecular weight brominated epoxy resins. It acts as a terminal cap in the molecular structure and can be used in epoxy resin or polyurethane. This product has good thermal stability at processing temperature. Other series of flame retardants can also be prepared and used as intermediates. It is widely used in the sterilization and preservative of wood and paper. The purity of 2,4,6-tribromophenol products is the guarantee of product quality in the downstream market. [0003] The current production process of 2,4,6-tribromophenol ...

AI Technical Summary

Problems solved by technology

Add tap water to the washing kettle before discharging, heat to boiling, turn on stirring and vacuum, add pre-dissolved additives while discharging (the amount of additives depends on the amount of feeding), observe the discharge glass tube When the color changes, it means that the discharge is over, start washing the material, and notify the fine acid workshop to release acid; when washing the material, heat the mixture of the material and the additives to boiling with steam, keep it for 20 minutes, stop the vacuum and stirring, Start pumping, and the water should be as clean as possible. The purpose is to remove the impurities of the washing material as much as possible, and take a sample to observe the color of the material; if the color of the material is red, you need to add additives again. The amount depends on the color of the material. Add water and boil. , start the second washing, turn on the vacuum and stirring, keep boiling for 1 minute, stop heating, vacuum and stirring, and pump water for the second time; repeat the above operation three times, start vacuuming to pull water, until the vacuumed glass tube wall forms a If the layer is evenly white, it means that the water has been pulled dry; check whether the cooling water and steam are normal, and turn on the slicer; open the bottom valve of the washing tank, control the flow rate of the material liquid, so that the material liquid flows into the hopper of the slicer evenly, and observe; When the feed liquid reaches a certain liquid level (in contact with the roller of the slicer), a layer of white solid tribromophenol is attached to the roller, which is cut off when passing through the cutter to form a uniform flake solid, which enters the collection bag through another hopper ; The current production process of the entire 2,4,6-tribromophenol is complex, energy-consuming, and costly

This wastes bromine

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