Safe discharging device and control method for sorbitol hydrogenation

Abstract

The invention discloses a safe discharging device for sorbitol hydrogenation. The safe discharging device comprises a flash tank, an evacuation device, a flash charging valve, a discharging valve, a steam adjustment valve and a pressure transmitter, and is characterized in that a steam exhaust hole of the flash tank is connected with the evacuation device through a pipeline; one hole of the evacuation device is connected with the steam adjustment valve through a steam conveying pipe; the other hole of the evacuation device is connected with an emptying pipe; the discharging valve is arranged at the bottom of the flash tank; the middle of the flash tank is connected with a material conveying pipe; the flash charging valve is arranged on the material conveying pipe; the pressure transmitter is arranged on the flash tank; the pressure transmitter is connected with a control unit through a signal line; the control unit is connected with the flash charging valve and the steam adjustment valve through signal lines. The safe discharging device and control method for the sorbitol hydrogenation have the advantages and the beneficial technical effects that hydrogen detonating sound in a sorbitol discharging process is eliminated, a fire caused by discharging hydrogen is avoided, and material leakage in the discharging process is avoided; the control method can be applied to a sorbitol hydrogenation reaction discharging device, and can also be applied to the discharging of other similar hydrogenation reaction devices.

Description

【Technical field】 [0001] The invention relates to the technical field of sorbitol production, in particular to a sorbitol hydrogenation safe discharging device and a control method. 【Background technique】 [0002] Sorbitol is a food additive and daily chemical raw material, used to make food emulsifier (span), cake foaming agent (cake oil) and toothpaste moisturizer, etc. The reaction is generated. [0003] In the production process of sorbitol, glucose and hydrogen are in the high-pressure reactor under the action of nickel catalyst, the reaction temperature is as high as 140°C, and the reaction pressure is as high as 7.0-8.0Mpa. After the reaction is completed, the product is mixed with flammable and explosive hydrogen and nickel. Catalysts, such as direct depressurization discharge, hydrogen and nickel catalyst are mixed in the discharge, and the nickel catalyst will spontaneously ignite when it encounters air at 40°C, and if it encounters hydrogen again, it will ignite ...

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Problems solved by technology

[0004] At present, in the industry, the flash tank is usually enlarged (some enterprises expand the volume of the flash tank to 20 cubic meters) to alleviate the sound and impact of hydrogen gas explosion, but if there is more hydrogen gas discharged with the material, the explosion during discharge The sound and impact force are relatively large, and the noise is loud. There are still serious environmental protection and safety hazards. Some enterprises have caught fire in the vent pipe when discharging materials, and even caused material running due to too much impact force.

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