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Predehydration process of methyl chloride

A methyl chloride and pre-dehydration technology, applied in the preparation of halogenated hydrocarbons, the disproportionation separation/purification of halogenated hydrocarbons, organic chemistry, etc., can solve the problems of foaming, TEG pollution and deterioration, affecting the smooth operation of the dehydration process, etc., and achieve the regeneration cycle. prolonged effect

Active Publication Date: 2020-01-03
山东京博中聚新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of activated alumina for dehydration can basically meet the requirements of the production process, but there are many problems: 1. Due to the high water content in the circulating methyl chloride entering the drying tower, which is about 3000ppm, the drying tower will be saturated after about 40 hours of use.
[0005] However, the dehydration effect of the existing TEG dehydration device needs to be improved. At the same time, serious pollution and deterioration of TEG will occur, resulting in foaming and affecting the smooth operation of the dehydration process.

Method used

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  • Predehydration process of methyl chloride
  • Predehydration process of methyl chloride
  • Predehydration process of methyl chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Methyl chloride (flow rate 20t / h, water content 2800ppm) that needs dehydration enters the absorption tower from the tower bottom of the absorption tower (using such as figure 1 Absorption tower shown), triethylene glycol solution (purity is 99%, flow rate 2.5t / h, pressure is 500kpa, temperature is 30 ℃) enters absorption tower by the tower top of absorption tower, and both are on the packing surface in absorption tower Countercurrent contacting completes the pre-dehydration of methyl chloride, and the pre-dehydrated methyl chloride is discharged from the top of the absorption tower and enters the subsequent dehydration process. The rich liquid that has absorbed water is discharged from the rich liquid outlet at the bottom of the absorption tower. The rich liquid after contact and absorption is heated to 70°C in the first heater, then enters the flash tank, and flashes at 70°C, part of the moisture in the rich liquid and part of the absorbed methyl chloride are converte...

Embodiment 2

[0090] Methyl chloride (flow 30t / h, water content 2800ppm) that needs dehydration enters the absorption tower from the tower bottom of the absorption tower (using such as figure 1 Shown absorption tower), triethylene glycol solution (purity is 99%, flow rate 3t / h, pressure is 500kpa, and temperature is 30 ℃) enters absorption tower by the tower top of absorption tower, and both countercurrents in the packing surface in absorption tower contact, thereby completing the pre-dehydration of methyl chloride, and the pre-dehydrated methyl chloride is discharged from the top of the absorption tower and enters the subsequent dehydration process. The rich liquid that has absorbed water is discharged from the rich liquid outlet at the bottom of the absorption tower. The rich liquid after contact and absorption is heated to 90°C in the first heater, then enters the flash tank, and flashes at 90°C, part of the water in the rich liquid and part of the absorbed methyl chloride are converted ...

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Abstract

The invention relates to the technical field of chemical industry, in particular to a predehydration process of methyl chloride. The predehydration process of methyl chloride comprises the following steps: A) carrying out contact absorption on methyl chloride and a triethylene glycol solution in an absorption tower to obtain predehydrated methyl chloride; and B) heating a rich solution subjected to contact absorption to 70-90 DEG C, and carrying out flash evaporation; and C) heating the rich solution subjected to flash evaporation to 130-220 DEG C, and carrying out regeneration, carrying out steam stripping on the regenerated lean solution, carrying out cooling, then carrying out anion exchange, and recycling the obtained solution to the absorption tower. The methyl chloride and the triethylene glycol solution are in countercurrent contact on the surface of a filler in the absorption tower so as to finish predehydration of the methyl chloride, flash evaporation and regeneration are carried out on the rich solution subjected to absorption at a specific temperature, the obtained lean solution is subjected to stripping and cooling, then anion exchange is carried out, and the obtainedsolution is recycled to the absorption tower. The methane chloride pre-dehydration process provided by the invention solves the problems of corrosion and entrainment of in an absorption tower, the dehydration effect is good, and a triethylene glycol predehydration system can continuously and stably operate.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a pre-dehydration process of methyl chloride. Background technique [0002] The existing domestic butyl rubber devices all use alumina to dehydrate the circulating chloromethane, and use the strong adsorption of alumina to reduce the water content in the circulating chloromethane to below 10ppm. The use of activated alumina for dehydration can basically meet the requirements of the production process, but there are also many problems: 1. Since the water content in the circulating methyl chloride entering the drying tower is relatively high, about 3000ppm, the drying tower will be saturated after about 40 hours of use. The adsorption regeneration of the drying tower is an intermittent operation, and the switching operation is performed every 40 hours, which causes the fluctuation of the water value of the methyl chloride and affects the stable operation of the polymeriza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/12C08F2/06C07C17/38C07C17/383C07C19/03
CPCC08F210/12C07C17/38C07C17/383C08F2/06C07C19/03
Inventor 葛良国滕杰王衍金栾波任学斌徐宏德
Owner 山东京博中聚新材料有限公司
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