Process and device for re-hydrogenating by-product in cyclohexylamine production process
A technology of production process and process device, applied in the field of cyclohexylamine synthesis, can solve the problems such as few reports on the utilization of by-products, and achieve the effects of less equipment, high efficiency and simple operation
Pending Publication Date: 2021-07-23
金城化学(江苏)有限公司
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Problems solved by technology
However, there will be by-products such as cyclohexylaniline and cyclohexene aniline in the production process, and there are few reports on the utilization of by-products at present.
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[0016] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.
[0017] See attached figure 1 Shown, in the cyclohexylamine production process in the present embodiment, by-product hydrogenation process operation is as follows again:
[0018] 1) Open the new hydrogen buffer tank 6, set the pressure to 0.65MPa, start to automatically adjust the hydrogen supply to the high-pressure hydrogen buffer tank, set the system pressure to 0.65MPa, start the hydrogen compressor 7 to pressurize the system, and when the system pressure reaches 0.65MPa , stop the hydrogen compressor 7. And keep the system pressure in the range of 0.5-0.65MPa, if it is lower than 0.5MPa, start the hydrogen compressor 7 to increase the pressu...
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The invention discloses a process and a device for re-hydrogenating by-products in a cyclohexylamine production process. The device comprises a crude product tank, a preheater, a reactor, a hydrogen circulating system and a hydrogen heater which are connected in sequence; the hydrogen heater is connected with the reactor, the reactor is connected with a product receiving tank, and the reactor is connected with a gas-water separator. The process comprises the following steps: boosting new hydrogen and recycle hydrogen to set pressure through a compressor; heating the reactor filled with the catalyst in advance; enabling hydrogen to circulate in the reactor, so that the inlet, outlet and in-pipe temperatures of the reactor are stable; starting the steam of a hydrogen heater, and heating the hydrogen; pumping the second-ring crude product in the crude product tank to the reactor, and receiving the product in the product receiving tank. The byproduct generated in the production process of cyclohexylamine is subjected to a re-hydrogenation process, so that the byproduct generated in the production process can be reduced into dicyclohexylamine, the conversion rate of aniline is improved, and the process is simple to operate, less in equipment, high in efficiency and less in three wastes.
Description
technical field [0001] The invention relates to the technical field of synthesis methods of cyclohexylamine, in particular to a rehydrogenation process and device for by-products in the production process of cyclohexylamine. Background technique [0002] Cyclohexylamine is an important chemical raw material and fine chemical intermediate, which can be used as a raw material for surfactants to produce cyclohexylamine alkylbenzenesulfonate, used for emulsifiers and foaming agents; used as raw materials for fragrances, production Allyl cyclohexyl propionate; used as raw material for dyes, producing acid blue 62, disperse fluorescent yellow, disperse fluorescent yellow H5GL, weak acid blue BRN, disperse blue 6 and dye auxiliaries; used as raw material for food additive sweeteners, etc. . His synthetic methods include: catalytic (nickel or cobalt) reduction of aniline under high temperature and high pressure to obtain the finished cyclohexylamine; cyclohexanol and cyclohexanone ...
Claims
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IPC IPC(8): C07C209/72C07C211/35
CPCC07C209/72C07C2601/14C07C211/35
Inventor 涂聪莉
Owner 金城化学(江苏)有限公司