Batch hydrogenation process and automatic control
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Are there any experts in the group who have experience with the batch hydrogenation process in autoclaves? Could you please tell me how the hydrogen feed is controlled – is it regulated through control valves in conjunction with the pressure inside the reactor? How is the pressure released after the reaction is complete, and is it necessary to use a buffer tank to collect the solvent? How to ensure the safe emission of hydrogen, how to separate the catalyst after the reaction, and how to return the catalyst to the reactor after separation through a filter? Is a level gauge included in the design of the reaction tank? If no level gauge is used, how is the amount of material added controlled? Is it controlled through a metering tank? How to take samples? Is there a sampling port at the hydrogen inlet? I am eagerly hoping for some guidance from experts. Thank you; you can contact me at QQ88646216
Basically answered my own question: lol
You’re asking questions that are too detailed and numerous; if I were to answer them all clearly, it would amount to half of a relatively complete process package.
The hydrogenation process is now a highly mature technology. If the production volume is low, batch hydrogenation is recommended; if it is high, a continuous hydrogenation process is advised. There are batch continuous, loop continuous, fluidized bed continuous, etc.
Well, our production volume is very small, and we use batch hydrogenation. Are you familiar with this process? I hope to get your help. Thank you
You can add me on WeChat. It’s my phone number.
I majored in process control; I have worked on the sequential control of intermittent hydrogenation reactors and am familiar with the processes involved. If I told you everything, it would count as leaking confidential information: lol
It’s quite simple: in intermittent hydrogenation, the hydrogen pressure generally needs to be maintained at or above the operating pressure; a fluctuation of 1 kilogram is not a problem. The temperature is controlled by the rate at which the substrate is added. Once the reaction stops absorbing hydrogen and the sample meets the required standards, the temperature is lowered for sedimentation, after which the gas is slowly released. A flame arrester must be installed on the vent pipe, and the release rate should be slow, otherwise solvents may be carried away. After sedimentation, as long as not too much liquid is discharged, the catalyst loss will be minimal.
The hydrogen inlet shut-off valve is controlled by DCS to maintain the pressure inside the reactor at the reaction pressure； Pressure relief can be achieved by interlinking the pressure of the vent pipeline with a pressure relief control valve in order to regulate the rate of pressure release; a condenser, a collection tank, and an absorption tower are installed afterward ； The catalyst is filtered and recovered, and can be pumped back using a slurry pump for reuse ； No level gauge is provided; the flow meter is used to accumulate the flow rate for feeding ； Set up an external circuit circulation and take samples at the pump outlet.
Agree with 4#: The hydrogenation process is currently a very mature technology. If the production volume is low, batch hydrogenation is recommended; if it is high, a continuous hydrogenation process is advised. There are batch continuous, loop continuous, fluidized bed continuous, etc.