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Isophthalonitrile and/or terephthalonitrile dry capture process

A technology of isophthalonitrile and terephthalonitrile, which is applied in the fields of carboxylic acid nitrile purification/separation, organic chemistry, etc., and can solve problems such as continuous discharge, harsh working environment on site, and difficult cooling of circulating spray water, etc. Achieve the effect of improving the operating environment and reducing the labor intensity of workers

Active Publication Date: 2020-04-17
SHANGHAI XIAOMING DETECTION TECH SERVICE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patents CN201384868 Y and CN101954231 B both adopt the trapping method of water spraying. The biggest problem of this trapping method is that the amount of wastewater to be treated is large, the cost of wastewater treatment is very high, and it is difficult to cool down the circulating spray water
At present, thin-wall capture is the most widely used in the production of isophthalonitrile in China. This capture method is labor-intensive for workers, and the working environment on site is harsh. Continuous discharge of products cannot be achieved.

Method used

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  • Isophthalonitrile and/or terephthalonitrile dry capture process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Isophthalonitrile and / or terephthalonitrile dry capture process, the process is as follows figure 1 Shown:

[0024] The reacted mixed gas at the outlet of the 230°C oil cooler enters the water cooler 1 to cool down. The water cooler 1 is equipped with a liquid atomizing nozzle. The temperature is lowered to 130°C by direct contact with the water mist, and the inner wall of the water cooler is kept at 100°C with a jacket to ensure that the isophthalonitrile and / or terephthalonitrile materials are not precipitated on the inner wall of the water cooler 1. The mixed gas at the outlet of the water cooler 1 enters the primary dry trap 2 and the secondary dry trap 3 in sequence, and the gaseous isophthalonitrile and / or terephthalonitrile enters the primary and secondary dry traps A large amount of precipitation on the inner wall and the surface of the hanging board becomes solid, and the solid isophthalonitrile and / or terephthalonitrile falls to the first-stage crushing at th...

Embodiment 2

[0027] Isophthalonitrile dry capture process, the temperature of the mixed gas after reaction at the outlet of the oil cooler is about 230°C, after being cooled by the water cooler, it enters the dry trap, and the gaseous isophthalonitrile is collected in the dry trap The inner wall of the trap and the surface of the hanging plate are precipitated and become solid, and the solid isophthalonitrile falls to the pulverizing feeder at the bottom of the dry trap by its own gravity and external vibration, and is transported to the dry trap by the scraper feeder after crushing. Refining section.

[0028] The tail gas from the outlet of the dry trap enters the wet trap, the sprayed isophthalonitrile slurry enters the beating kettle, and the beating pump sends the suspended matter slurry in the beating kettle to the filter press for filtration. The tail gas at the outlet of the device enters the tail gas incinerator for treatment.

[0029] In this embodiment, the water cooler adopts a...

Embodiment 3

[0032] Terephthalonitrile dry capture process, the temperature of the mixed gas after reaction at the outlet of the oil cooler is about 230°C, and enters the dry trap after being cooled by the water cooler, and the gaseous terephthalonitrile The inner wall of the trap and the surface of the hanging plate are precipitated and become solid, and the solid terephthalonitrile falls to the crushing feeder at the bottom of the dry trap by its own gravity and external vibration, and is transported to the dry trap by the scraper feeder after crushing. Refining section.

[0033] The tail gas from the outlet of the dry trap enters the wet trap, and the sprayed isophthalonitrile and / or terephthalonitrile slurry enters the beating tank, and the beating pump sends the suspended matter slurry in the beating tank to the pressure filter, and the exhaust gas from the outlet of the wet trap enters the exhaust gas incinerator for treatment.

[0034] In this embodiment, the water cooler adopts a ja...

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Abstract

The invention relates to isophthalonitrile and / or terephthalonitrile dry trap technology. Mixed gas formed at an outlet of an oil cooler after a reaction is cooled by a water cooler and enters a dry trap, gaseous isophthalonitrile and / or terephthalonitrile is separated at the inner wall and hanging board surface of the dry trap, forms a soil, and falls into a pulverization feeder located at the bottom of the dry trap, the obtained product is pulverized, and the pulverized product is conveyed to a refining section through a dry trap scraper plate feeder. Compared with the technology in the prior art, the technology allows automatic continuous discharge to be achieved, the labor intensity of a worker is reduced, the on-site environment is improved, and consumption of flushing water is greatly reduced, so that the wastewater quantity is greatly reduced.

Description

technical field [0001] The invention relates to the field of pesticide refining, in particular to a dry collection process of isophthalonitrile and / or terephthalonitrile. Background technique [0002] Isophthalonitrile (IPN) is an important organic raw material for organic synthesis. Tetrachloroisophthalonitrile synthesized by chlorination is an efficient and low-toxic fungicide; m-xylylenediamine obtained by hydrogenation is a superior performance It is an excellent curing agent for epoxy resin, and it is also a raw material for polyurethane resin and nylon resin. [0003] At present, the most important method of synthesizing isophthalonitrile is to obtain m-xylene with ammonia and oxygen under the action of catalyst through ammoxidation reaction. In the 1950s, Japan’s Showa Denko developed the production technology of m-xylene ammoxidation in a fixed bed to synthesize isophthalonitrile. In the 1970s, Japan’s Mitsubishi Gas Co., Ltd. and the US Badger Company jointly devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C253/34C07C255/51
CPCC07C253/34C07C255/51
Inventor 王海波胡清禚文峰李强田玫丽谢思勉田晓宏
Owner SHANGHAI XIAOMING DETECTION TECH SERVICE CO LTD
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