Isophthalonitrile continuous rectification and purification device

An isophthalonitrile and rectification technology, which is applied in the purification/separation of carboxylic acid nitrile, organic chemistry, etc., can solve the problems of unstable quality and low purity of isophthalonitrile products, and achieve continuous stability improvement, The effect of high yield and low operating cost

Pending Publication Date: 2019-12-20
JIANGSU XINHE AGROCHEM
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  • Abstract
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Problems solved by technology

[0009] In view of the problems existing in the prior art, the present invention provides a continuous rectification and purification device for isophthalonitrile, which uses a scraper evaporator and a rectification tower to evaporate the isophthalonitrile raw material on the scraper After being vaporized in the device, it enters the middle section of the rectification tower for rectification and purification, which overcomes the problems of unstable product quality and low purity of isophthalonitrile, realizes continuous and stable production, reduces production costs and amide content in products, and thus significantly Reduced the content of hexachlorobenzene in downstream chlorothalonil products, improved the quality of chlorothalonil products, and eased environmental pressure

Method used

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  • Isophthalonitrile continuous rectification and purification device

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Embodiment 1

[0100] The present embodiment provides a kind of isophthalonitrile continuous rectifying purification device, such as figure 1 As shown, it includes a raw material supply unit, a purification unit and a product receiving unit connected in sequence, wherein,

[0101] The raw material supply unit includes: the raw material supply unit includes: a plunger type feed metering pump 1, a melting intermediate tank 2, a scraper evaporator 3, a first coke cutting tank 4 and a second coke cutting tank 5; wherein the plunger Type feed metering pump 1, melting intermediate tank 2 and scraper evaporator 3 are connected in sequence. The scraper evaporator is equipped with a stirring device inside, and the scraper is in the form of a limit hinge scraper. The bottom of the scraper evaporator 3 They are respectively connected to the tops of the first coke-cutting kettle 4 and the second coke-cutting kettle 5, and first valves are arranged on the connected pipelines, which are respectively valve...

Embodiment 2

[0105] This embodiment provides a kind of isophthalonitrile continuous rectification purification device, it comprises the raw material supply unit, purification unit and product receiving unit connected in sequence, wherein,

[0106] The raw material supply unit includes: a plunger type feed metering pump 1, a scraper evaporator 3, a first coke cutting tank 4 and a second coke cutting tank 5; wherein, the plunger type feed metering pump 1 and scraper evaporator The scraper evaporator is connected in turn, and the scraper evaporator is provided with a stirring device inside, and the scraper is in the form of a limit hinge scraper. The bottom of the scraper evaporator 3 is connected to the first coke cutting kettle 4 and the second coke cutting kettle 5 respectively. The tops are connected, and the first valves are set on the connected pipelines, which are respectively valve V3 and valve V6. The tops of the first coke-cut kettle 4 and the second coke-cut kettle 5 are also connec...

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Abstract

The invention provides an isophthalonitrile continuous rectification and purification device which comprises a scraper evaporator and a rectification tower which are connected in sequence, can realizecontinuous and stable production and is low in operation cost. Through the device, continuous and stable purification of isophthalonitrile can be realized; the isophthalonitrile product with the purity of more than or equal to 99.83 wt% is obtained, and the content of intermediate cyanobenzamide in the product is reduced, so that the mass of residues in a melter in a chlorothalonil production device is reduced, the content of hexachlorobenzene in a downstream chlorothalonil product is reduced, and the environmental pressure is relieved.

Description

technical field [0001] The invention relates to the field of pesticide refining, in particular to a continuous rectification and purification device for isophthalonitrile. Background technique [0002] Isophthalonitrile (IPN) is an important organic raw material for organic synthesis, used to prepare plastics, synthetic fibers, pesticides (chlorothalonil) and epoxy resin curing agents. Tetrachloroisophthalonitrile synthesized by chlorination of isophthalonitrile is a high-efficiency, low-toxicity fungicide; m-xylylenediamine obtained by hydrogenation of isophthalonitrile is an epoxy resin curing agent with superior performance. It is also a raw material for polyurethane resin and nylon resin. [0003] At present, the most important method for synthesizing isophthalonitrile is the ammoxidation method, that is, under the action of a catalyst, m-xylene reacts with ammonia and oxygen to prepare isophthalonitrile by ammoxidation. However, the isophthalonitrile product produced ...

Claims

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Application Information

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IPC IPC(8): C07C253/34C07C255/51
CPCC07C253/34C07C255/51
Inventor 王海波鲍凯杜杰禚文峰
Owner JIANGSU XINHE AGROCHEM
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