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Process and system for producing methacrylonitrile through fractional-step ammoxidation reaction

A technology of ammoxidation reaction and methacrylonitrile, which is applied in the field of catalytic ammoxidation, can solve the problems of difficult treatment, low selectivity, and many by-products, and achieve the effects of stable product quality, sufficient reaction, and increased yield

Pending Publication Date: 2022-03-15
WUHUAN ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The one-step ammoxidation of isobutene to produce methacrylonitrile requires low investment and easy access to raw materials, but there are problems such as low selectivity, many by-products and difficult treatment, difficult to control the mixing of ammonia and oxygen, and easy explosion.

Method used

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  • Process and system for producing methacrylonitrile through fractional-step ammoxidation reaction

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, the present invention will be further explained:

[0031] see figure 1 , the system of the present invention comprises the first filter-type stirred reactor 3, the gas-liquid separation tank 5, the feed pump 10, the second filter-type stirred reactor 4 and the reactor discharge tank 7 connected in sequence, wherein the first filter Type stirred reactor 3 is provided with ammonia gas inlet, raw material inlet and catalyst inlet, described second filtering type stirred reactor 4 is provided with oxygen or air inlet, reaction liquid inlet and catalyst inlet, the gas phase of described gas-liquid separation tank 5 The outlet is connected to the ammonia gas inlet of the first filter-type stirred reactor 3 through the ammonia gas compressor 6 , and the liquid phase outlet of the gas-liquid separation tank 5 is connected to the reaction liquid inlet of the second filter-type stirred reactor 4 .

[0032] Catalyst outlets at the b...

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Abstract

The invention relates to a process and a system for producing methacrylonitrile through fractional-step ammoxidation reaction, and the process comprises the following steps: 1) feeding methylacrolein, ammonia gas and a part of catalyst slurry into a first filtering type stirring reactor together for ammonolysis reaction to obtain a reaction solution containing an intermediate product and a catalyst after reaction, filtering the reaction liquid and discharging; and 2) feeding the reaction liquid, air or oxygen and the rest catalyst slurry into a second filtering type stirring reactor for oxidation reaction to obtain a product liquid containing methacrylonitrile and a reacted catalyst, filtering the product liquid, and feeding the filtered product liquid into a discharging tank of the reactor. The system is used for the process. The method is simple in process, low in production and operation cost, convenient to operate, mild in reaction condition, capable of effectively avoiding explosion risks caused by high-temperature reaction and ammonia-oxygen mixing, less in generation of toxic and side products and high in yield.

Description

technical field [0001] The invention belongs to the technical field of catalytic ammoxidation, and specifically relates to a process and a system for producing methacrylonitrile by a step-by-step ammoxidation reaction. Background technique [0002] Methacrylonitrile (MAN), also known as 2-methyl-2-acrylonitrile, is a colorless liquid and is an important chemical raw material. Acrylic acid and its esters are polymerized to prepare polymer materials such as homopolymers, copolymers, and elastomers. In addition, MAN can also be used as a substitute for acrylonitrile (AN) in the production of ABS resin. Currently, MAN is mainly used in the production of polymethacrylimide (PMI) and is irreplaceable to a certain extent. [0003] Currently, more than 80% of MAN is used to produce PMI foam, so the market for MAN is closely related to the market for PMI foam. Due to its excellent performance, PMI foam has been widely used in aerospace, automotive lightweight, rail transit, wind p...

Claims

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Application Information

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IPC IPC(8): C07C255/08C07C253/26
CPCC07C253/26C07C255/08Y02P20/52Y02P20/584
Inventor 张威刘凯鹏张大洲张科卢文新肖敦峰张宗飞胡四斌
Owner WUHUAN ENG
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