A kind of cyclic regeneration method of alumina drying tower in butyl rubber plant

Abstract

The invention provides a cyclic regeneration method of an alumina drying tower in a butyl rubber device, comprising a switching stage and a regeneration stage, capable of realizing the cyclic regeneration of the alumina drying tower; Replacement, and the sign of completion of nitrogen replacement is improved from the 60min of the existing technology to the temperature rise at the bottom temperature measurement point of the bed, which can reduce the heat of adsorption generated inside the bed; strictly control the moisture in the bed during the regeneration stage to avoid moisture into the bed; so that based on the operation of the existing alumina drying tower, specific steps, conditions and parameters are adopted to achieve better interaction, reduce the risk of water saturation in the bed, and improve the regeneration effect of the alumina drying tower. Extend the service life, reduce the switching frequency, further reduce the overall energy consumption and material consumption of the butyl rubber plant, stabilize the polymerization reaction, and stabilize the product quality.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, and more specifically relates to a recycling method for an alumina drying tower in a butyl rubber plant. Background technique [0002] In the butyl rubber plant, the whole process uses methyl chloride as the reaction carrier. After mixing isobutylene, isoprene and methyl chloride, it enters the reactor for reaction. After the reaction, the process carrier, methyl chloride enters the flash tank for flash vaporization, and then The compressor is pressurized and circulated, and then the process carrier rich in dimethyl ether (hereinafter referred to as DME) is dehydrated into the triethylene glycol system for dehydration and after the alumina drying tower removes DME, it becomes gas-depleted methyl chloride, and finally chlorine The methane is separated, purified and recovered, and the purified methyl chloride circulates to participate in the polymerization reaction. [0003] In the re...

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Problems solved by technology

[0006] In actual operation, the operating cycle of each alumina drying tower has become an important factor restricting production. The service cycle (operating time) of each alumina drying tower in the existing recycling method is about 6 to 7 days; Frequent switching of towers not only increases the overall energy and material consumption of the butyl rubber plant, but also affects the adjustment of the polymerization reaction, which will generate a large amount of butyl rubber with unqualified Mooney viscosity, seriously affecting the stability of the plant and product quality

However, due to the regeneration stage of the above-mentioned cyclic regeneration method, the removal process gas chloride stage, the hydrolysis of methyl chloride will generate a large amount of acid, in order to neutralize the acid produced in the above-mentioned stage, it is neutralized by washing with an alkali washing tower, and this part of the lye is usually It is discharged during the pressure relief and vacuuming stage, and after the compressor is turned on again to cool down, water is easily brought into the system, causing the bed to be saturated with water; thus, in the subsequent switching process, the alumina drying tower is directly evacuated for process gas chlorine Filling with methane will generate a large amount of adsorption heat inside the bed, resulting in high-temperature hydrolysis of methyl chloride to generate a large amount of DME, which greatly affects the service life and service life of the alumina drying tower

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