Emergent shutdown method for hydrogenation device in production of hydrogen peroxide

Abstract

The invention discloses an emergent shutdown method for a hydrogenation device in production of hydrogen peroxide. The method comprises the following steps: (1) arranging a system for emergent shutdown of hydrogenation in the hydrogenation device, and when operation parameters are abnormal, opening the system; (2) after the system is opened, and carrying out the following steps: a, completely stopping feeding of hydrogen gas; b, increasing the circulation volume of working fluid; c, when the outlet temperature of the hydrogenation device is reduced to 45 DEG C or below, opening a working fluid bypass valve, and closing a working fluid feeding valve; d, opening an aromatic hydrocarbon feeding valve, introducing low-temperature aromatic hydrocarbon, and subjecting a catalyst bed to washing; e, opening a nitrogen gas inlet valve, introducing nitrogen gas into the hydrogenation device, and carrying out aromatic hydrocarbon replacement; and f, introducing nitrogen gas, and subjecting the catalyst bed to blowing and purging; and (3) when the operation parameters return to normal levels, closing the system, and closing inlet and outlet pipelines of all materials at the same time so as to finish shutdown operation. The method provided by the invention is safe, stable and reliable, and is significantly favorable for protecting noble metal catalysts.

Description

Technical field [0001] The invention relates to a method for emergency shutdown of a hydrogenation device in hydrogen peroxide production. Background technique [0002] Hydrogen peroxide is a colorless and transparent liquid, which can be miscible with water in any ratio. Hydrogen peroxide is a strong oxidant, which is extremely unstable. When it comes in contact with heavy metals and their salts, dust, and alkaline substances, it can be exposed to light or heat. It accelerates decomposition and releases a lot of heat. Contact with hydrogen peroxide on rough surfaces may also accelerate its decomposition. The decomposition reaction is as follows: H 2 O 2 —→H 2 O+1 / 2O 2 +97.8kj / mol. The decomposition reaction speed is closely related to temperature, pH value and impurity content. With the increase of temperature, pH value and its impurity content, the decomposition reaction speed also increases. [0003] The industrial production method of hydrogen peroxide is mainly the anthraqui...

AI Technical Summary

Problems solved by technology

In this method, due to the remaining part of the working fluid and a large amount of hydrogen in the catalyst bed, a deep hydrogenation reaction occurs instantaneously, causing the temperature of the catalyst bed to rise rapidly, and these deep reaction degradation products are attached to the surface of the catalyst, causing catalyst agglomeration and destruction, and When nitrogen purging is used, the nitrogen will carry the heat out and transfer it to the hydrogenation liquid in the gas-liquid separator, which may easily cause a flash explosion accident of the hydrogenation liquid. Therefore, it can be seen that there is a certain danger in the shutdown process of the conventional hydrogenation process, and it is easy to damage and expensive catalyst

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