Method for extracting dichlorobenzene cut fraction in mixed chlorobenzene with continuous single-column multi-ply sidetrack discharge fractional distillation
A technology of dichlorobenzene fraction and chlorinated benzene, which is applied in chemical instruments and methods, organic chemistry, preparation of halogenated hydrocarbons, etc., can solve the problems of high production cost and large energy consumption, and achieve the effect of reducing energy consumption
Active Publication Date: 2011-02-16
JIANGSU LONGCHANG CHEM
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Problems solved by technology
Using the above method to mix chlorinated benzene, because multiple distillations and multiple condensations need to consume a lot of energy, resulting in excessive production costs
Method used
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Embodiment 1
[0027] Embodiment 1, the method for extracting the dichlorobenzene fraction in the mixed chlorinated benzene by continuous single tower multi-strand side stream rectification method, adopts figure 2 Shown technological process, the steps are as follows,
[0028] (1). Put the raw material into the still of the rectification tower;
[0029] (2). When the liquid level reaches 1 / 3, turn on the cooling water of the top and side condensers to start heating;
[0030] (3). When the temperature of the top and bottom of the rectification tower is stable, the reflux ratio at the top of the tower is controlled to be about 5:1, and the material starts to be discharged. 177.6~178.9, the base temperature is 198.6~201.4℃;
[0031] (4). After separation, the content of monochlorobenzene and dichlorobenzene in the side stream discharge reaches 99.7%, and the content of dichlorobenzene reaches 99.5%, and the yields of monochlorobenzene and dichlorobenzene reach 94.5% and 91.2% respectively. ...
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The present invention provides a separation process used for extracting dichlorobenzene from mixed benzene chloride in the distillation method of continuous and lateral discharge of a single tower. In the process, one tower can realize the separation of the mixed benzene chloride produced in the chlorination reaction of benzene so as to prepare benzene that can not completely react, monochlorobenzene, dichlorobenzene and heavy components. The process has the following specific steps: raw materials are arranged in the reactor of a rectification tower; when the liquid level reaches to 1 / 3, the raw materials are heated; when the temperature of the top and the bottom of the rectification tower becomes stable, the products begin to be discharged; the temperature of the top is 80.2 to 81.3 DEG C; the temperatures of the discharge of two lateral lines are from 132.4 to 133.9 DEG C and from 177.6 to 178.9 DEG C; the bottom temperature is 198.6 to 201.4 DEG C; after the separation, the contentof the dichlorobenzene of the lateral discharge reaches to 99.3 percent; the yield reaches to 94 percent; the production cycle of processing 1 ton of the mixed benzene chloride is shortened to be 2 hours from 8 hours of gap distillation; and the energy consumption can be reduced by 48 percent.
Description
technical field [0001] The invention relates to a chemical separation process, in particular to a method for extracting dichlorobenzene fractions in mixed chlorinated benzenes by a continuous single-tower multi-strand side line discharge rectification method. technical background [0002] Chlorinated benzene and dichlorobenzene are important raw materials and intermediates of pesticides, dyes, medicines and spices. [0003] (1). p-Dichlorobenzene: It is an important intermediate of pesticides, medicines, and spices, and it is also an excellent sterilization, disinfection, and deodorant. It can also be used to make extreme pressure lubricants, corrosion inhibitors, etc. Not only is it a low-toxic, highly effective anti-mold and anti-moth agent, it can effectively replace the carcinogenic naphthalene pills that people use daily, and it is also an important organic chemical raw material, mainly used to produce polysulfide resin, norfloxacin and dyes Intermediates, etc. In rec...
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IPC IPC(8): C07C25/08C07C17/383
Inventor 顾正桂
Owner JIANGSU LONGCHANG CHEM