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...

Examples

Embodiment

[0032] The emergency shutdown system using this hydrogenation system, hydrogen 1 is 105Nm 3 / h, working fluid 4 is 3.12m 3 / h, circulating working fluid 6 is 0.71m 3 / h, the total working fluid 7 is 3.83m 3 / h. When the emergency hydrogenation shutdown system is turned on, first start the emergency shutdown system 14 of the hydrogenation system, and instantly close the hydrogen feed valve K1; open the valve K6 of the working fluid circulation pipeline, and close the valve K7 that discharges the working fluid to the next process. The working fluid is circulated at 100%; when the outlet temperature of the hydrogenation tower drops to 45°C, open the bypass valve K5 of the working fluid, close the valve K4 where the working fluid enters the hydrogenation tower; open the valve K2 of the low-temperature aromatics feed line to the hydrogenation tower Introduce 48℃ low-temperature aromatic hydrocarbons, wash the catalyst bed for 3 minutes, and then introduce 40℃ low-temperature aromatic...

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...

Examples

Embodiment

[0032] The emergency shutdown system using this hydrogenation system, hydrogen 1 is 105Nm 3 / h, working fluid 4 is 3.12m 3 / h, circulating working fluid 6 is 0.71m 3 / h, the total working fluid 7 is 3.83m 3 / h. When the emergency hydrogenation shutdown system is turned on, first start the emergency shutdown system 14 of the hydrogenation system, and instantly close the hydrogen feed valve K1; open the valve K6 of the working fluid circulation pipeline, and close the valve K7 that discharges the working fluid to the next process. The working fluid is circulated at 100%; when the outlet temperature of the hydrogenation tower drops to 45°C, open the bypass valve K5 of the working fluid, close the valve K4 where the working fluid enters the hydrogenation tower; open the valve K2 of the low-temperature aromatics feed line to the hydrogenation tower Introduce 48℃ low-temperature aromatic hydrocarbons, wash the catalyst bed for 3 minutes, and then introduce 40℃ low-temperature aromatic...

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