Small scale continuous production system of cyclohexanone oxime

Abstract

The invention discloses a continuous production system for cyclohexanone oxime. The continuous production system comprises a reactor, a charging system, a discharging system, a heat supplying system, a condensing system and a gas supplying system, wherein the charging system conveys materials into the reactor from the top of the reactor, material liquid in the reactor is discharged from the outlet end of the bottom of the reactor through cooperated operation among the condensing system, the heat supplying system and the gas supplying system, passes through a centrifugal circulating pump and then enters a membrane separator group from the outlet end of the centrifugal circulating pump, the membrane separator group consists of two membrane separators which are connected in parallel, an outlet I is formed in the middle part of each membrane separator, an outlet II is formed in the bottom of each outlet I, the outlets I are connected with a product gathering tank through pipelines, and the outlets II are connected to a liquid return interface through pipelines so as to form a circulation loop. Due to internal and external pressure difference of membrane pipes, part of the liquid phase permeates out, so that a catalyst can be stripped from the product; and the continuous production system can achieve the continuous production of a whole process from charging to middle product collecting to discharging.

Description

technical field [0001] The invention relates to the technical field of preparation of cyclohexanone oxime, in particular to a small-scale continuous production system of cyclohexanone oxime. Background technique [0002] At present, the production of cyclohexanone oxime mostly adopts the method of direct hydroxylamine salt oximation of cyclohexanone. This kind of process route is complicated, uses a large amount of corroded and polluted raw materials, and causes great harm to the environment. The new process of direct ammoxidation of cyclohexanone to cyclohexanone oxime is to use cyclohexanone, ammonia and hydrogen peroxide to directly prepare cyclohexanone oxime by catalytic reaction of TS molecular sieve under low pressure conditions, which greatly shortens the process flow and reduces the harm to the environment. Emission of substances, broad application prospects. [0003] At present, the production process in the prior art is through the feeding of gas, liquid and soli...

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Problems solved by technology

[0003] At present, the production process in the prior art is through the feeding of gas, liquid and solid phases, and the reaction releases a large amount of heat. If the reaction heat is not removed in time, the risk of over-temperature is prone to occur; the reaction releases a large amount of gas at the same time, and over-temperature is prone to occur. pressure danger

The existing small-scale test devices are either assembled from glass vessels, have poor high temperature and high pressure resistance, and have a small reaction scale, which cannot meet the new process requirements; Continuous small-scale production of the whole process from material discharge, intermediate product collection, gas sampling, etc.; safety control methods such as reactor over-temperature cooling, over-pressure discharge, etc. cannot be realized

[0004] In addition, since the reaction process requires the use of TS molecular sieve catalysts, the granular molecular sieves need to be stripped from the product when the product is collected at the end of the reaction. At present, there is no small-scale test device that can remove the solid catalyst from the product liquid during continuous production. lost function

Therefore, so far, there is no small-scale plant adapted to the new process for the synthesis of cyclohexanone oxime by the direct ammoxidation of cyclohexanone

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