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Process for producing paradichlorobenzene

A technology for producing p-dichlorobenzene, applied in organic chemical methods, chemical instruments and methods, preparation of halogenated hydrocarbons, etc., can solve problems such as rising, maintaining operation within a certain temperature range, etc., to achieve stable operation, suppress The effect of temperature rise and long-term operation

Active Publication Date: 2014-05-21
TSUKISHIMA KIKAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method disclosed in Patent Document 3 is a laboratory-level method, and it is not considered to be a specific method that can be operated as an actual device.
In addition, since the chlorination reaction of benzene is a violent exothermic reaction, it is very important to appropriately suppress the temperature rise and maintain the operation within a certain temperature range in an actual device. inspiration for effective solutions

Method used

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  • Process for producing paradichlorobenzene
  • Process for producing paradichlorobenzene
  • Process for producing paradichlorobenzene

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0100] Next, embodiments of the present invention will be described.

[0101] figure 1 A preferred embodiment of the present invention is shown.

[0102] Reference numeral 10 denotes a reactor, which is constituted in three stages in the embodiment. Benzene 1 as a raw material is supplied from the top of the reactor 10 in the first stage after the water is removed in advance by a water removal unit (not shown) if necessary.

[0103] The chlorine gas 2 is supplied in parallel to the reactors 10 , 10 , 10 in each stage from the top of the tower. Condensers 12 , 12 , 12 are attached to the respective reactors 10 , 10 , 10 . Chloroform (cooling medium) 3 was sent from the storage tank to the mixer 14, and was supplied to the reactor 10 in the first stage from the top of the tower by a pump 16. In addition, recovered chloroform 3A recovered in a subsequent step of the treatment flow (details not shown) is supplied together with benzene 1 from the top of the reactor 10 in the fi...

no. 2 Embodiment approach

[0109] Figure 4 The second embodiment of the present invention is shown.

[0110] The reactor 10 is constituted in three stages. Benzene 1 as a raw material is supplied from the top of the reactor 10 in the first stage after the water is removed in advance by a water removal unit (not shown) if necessary.

[0111] The chlorine gas 2 was supplied in excess from the top of the reactor 10 in the final stage. In each of the reactors 10, 10, 10, an alumina catalyst 18 (formed body) is installed as a fixed bed, and the raw material (benzene), chlorine gas, and cooling medium are circulated in a downward flow. A cooling jacket 11 is installed on the peripheral wall of the reactor 10, and is cooled by a cooling medium such as water.

[0112] The reaction product is sequentially introduced into the next-stage reactors 10 and 10 by the pumps 20 and 20 . In the reactor 10 , the evaporated components (mainly cooling medium) are condensed by the condensers 12 , 12 , 12 and then sent t...

no. 3 Embodiment approach

[0115] Figure 5 The third embodiment of the present invention is shown.

[0116] The reactor 10 is constituted in two stages. Benzene 1 as a raw material is supplied from the top of the reactor 10 in the first stage after the water is removed in advance by a water removal unit (not shown) if necessary.

[0117] The chlorine gas 2 is supplied from the top of the tower in parallel to the reactors 10 and 10 of each stage. Condensers 12 , 12 are attached to the respective reactors 10 , 10 . Chloroform (cooling medium) 3 was sent from the storage tank to the mixer 14, and was supplied to the reactor 10 in the first stage from the top of the tower by a pump 16. In addition, recovered chloroform 3A recovered in a subsequent step of the treatment flow (details not shown) is supplied together with benzene 1 from the top of the reactor 10 in the first stage. In addition, recovered chloroform 3B recovered in a subsequent step (details not shown) of the treatment flow is also supplie...

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Abstract

A process for producing paradichlorobenzene with a practical apparatus is provided in which the desired compound is obtained in a high yield and the apparatus can be stably operated. The process comprises chlorinating benzene and / or monochlorobenzene as a starting material with chlorine gas to produce paradichlorobenzene, wherein the starting material is introduced into reactors arranged in multiple stages and packed with a catalyst comprising alumina as a main component. Chlorine gas is supplied, in parallel, to the reactors. The starting material and chlorine gas are supplied to the first-stage reactor, and a reaction product obtained in the preceding stage is supplied to the second-stage reactor. Chlorine gas is supplied, in parallel, to the second-stage and succeeding reactors, and paradichlorobenzene is obtained from a reaction product obtained in the final stage.

Description

technical field [0001] The present invention relates to a method for producing p-dichlorobenzene, in particular to using at least one of benzene (hereinafter also referred to as "Bz") and monochlorobenzene (hereinafter also referred to as "MCB") as a raw material, using alumina as a catalyst, A method of producing p-dichlorobenzene (hereinafter also referred to as "p-DCB" or "PDCB") by chlorination with chlorine gas. In addition, in this specification, "alumina catalyst" means "a catalyst mainly composed of alumina". Background technique [0002] p-DCB is used as a raw material for medicines and pesticides; and as an insecticide and insect repellent itself; further as a raw material for polyphenylene sulfide (PPS), it is a compound with extremely high industrial value. [0003] Conventionally, for p-DCB, there is known a production method of liquid-phase chlorination of benzene and / or monochlorobenzene using a Lewis acid such as ferric chloride and antimony pentachloride as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/12B01J21/04C07C25/08C07B61/00
CPCC07C17/12
Inventor 浅冈佐知夫川端友宽
Owner TSUKISHIMA KIKAI CO LTD
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