Background and overview[1]
2,4,5-Trichloroaniline is a poison that can spontaneously ignite. It also has the function of supporting combustion and can also be used as a dye intermediate. It is slightly soluble in petroleum ether and easily soluble in ethanol and carbon disulfide. During the production and preparation process, it needs to be in a cool and ventilated environment, and workers must wear protective clothing to avoid irritation to the skin.
Production device and method[1]
A 2,4,5-trichloroaniline production device, including a servo motor, a mixing barrel, a first gear, a connecting pipe, a waste gas collection tank, a first rotating shaft, a spiral blade, a solenoid valve, a filter device, and a shock absorber device, support frame, discharge pipe, electric heating piece, mixing blade, control panel, second rotating shaft, feed pipe, fixed box and second gear. The mixing barrel is connected to the control panel through a data line. The mixing barrel One side of the mixing barrel is movably connected with a feed pipe through a flange, the other side of the mixing barrel is movably connected with a waste gas collection tank through a snap, and a connecting pipe is movably connected between the waste gas collection tank and the mixing barrel through a flange. A discharge pipe is movably connected to the center of the bottom of the mixing barrel through a flange. A solenoid valve is fixed on one side of the discharge pipe through bolts. One end of the discharge pipe is movably connected to a filtering device through a buckle. The bottom of the mixing barrel is fixed with a support frame through bolts. The bottom of the support frame is equipped with a shock absorbing device. Electric heating sheets are evenly distributed on the inner walls of both sides of the mixing barrel. The center of the top of the mixing barrel is fixed with bolts. There is a servo motor, one side of the servo motor is movably connected to a second rotating shaft through a coupling, a second gear is installed on the second rotating shaft, and a spiral blade is fixed on the outside of the second rotating shaft through bolts. A first rotating shaft is installed inside the mixing barrel, a first gear is installed on the first rotating shaft, a fixed box is installed on the outside of the first gear and the second gear, and the fixed box and the mixing barrel are bonded Fixed, stirring blades are evenly distributed on the outside of the first rotating shaft;
The filtering device is composed of an adsorbent cotton mesh, a sponge filter and a filter cover. The filter cover is equipped with an adsorbent cotton mesh and a sponge filter respectively, and the adsorbent cotton mesh, sponge filter and filter mesh are installed inside the filter cover. The covers are all fixed by bonding;
The shock-absorbing device consists of a telescopic spring, a slide rail, a connecting plate, a shock-absorbing seat, a buffer airbag, a slider, a limit block and a buffering column. Slide rails are installed on the inner walls of both sides of the shock-absorbing seat. , both ends of the slide rail are fixed with limit blocks by welding, a slide block is installed inside the slide rail, and a connecting plate is fixed by bolts between the two slide blocks, and the top of the connecting plate is fixed by bolts There is a buffering column, and a telescopic spring is connected between the buffering column and the top inner wall of the shock-absorbing seat. A buffering airbag is fixed by bonding between the bottom center of the connecting plate and the center of the bottom inner wall of the shock-absorbing seat. The control panel is electrically connected to the servo motor, electric heating plate and solenoid valve.
A method for producing 2,4,5-trichloroaniline, including the following steps: step one, material selection and preparation; step two, nitrification treatment; step three, reduction treatment; step four, distillation treatment; step five, reasonable Save;
In the above step one, prepare enough 1,2,4-trichlorobenzene, purified water, iron powder, acetic acid, mixed acid and 95% sulfuric acid, and place them in a low temperature environment to avoid acidic Raw materials volatilize;
In the above step two, 95% sulfuric acid and 1,2,4-trichlorobenzene are introduced from the feed pipe into the mixing barrel for stirring. The stirring time is controlled at thirty minutes, and passed The control panel controls the operation of the electric heating element to maintain the reaction temperature in the mixing barrel at 45 degrees. Then the mixed acid is introduced into the mixing barrel from the feed pipe for mixing. The mixing time is controlled at two hours, and the electric heating is controlled through the control panel. The heating plate works to maintain the reaction temperature in the mixing barrel at 60 degrees. Finally, pure water is added for dilution, and the crude chloronitrobenzene generated by the chemical reaction can be obtained in the mixing barrel;
In the above-mentioned step three, acetic acid, iron powder and purified water are introduced into the mixing barrel from the feed pipe, and stirred with the crude trichloronitrobenzene generated by the chemical reaction in the mixing barrel in step two. , the stirring time is controlled at four hours, and the operation of the electric heating element is controlled through the control panel to stably maintain the reaction in the mixing barrel at 150 degrees, so that the raw materials in the mixing barrel are fully boiled, and then the process can be obtained in the mixing barrel. Crude 2,4,5-trichloroaniline produced by chemical reaction;
In the above-mentioned step four, the crude 2,4,5-trichloroaniline generated by the chemical reaction in the stirring barrel in step three is distilled. The distillation time is controlled to one hour, and the distilled gas is It is introduced into the waste gas collection tank through the connecting pipe for collection, and at the same time, the purified 2,4,5-trichloroaniline can be obtained in the mixing barrel;
In the above-mentioned step five, first control the solenoid valve to open through the control panel, and the purified 2,4,5-trichloroaniline in step four is exported from the discharge pipe, and then filtered through the filtering device The residue in the mixing barrel is filtered, and finally the prepared 2,4,5-trichloroaniline is stored in a stainless steel sealed tank and placed.��In a cool and ventilated space.
Apply[2-3]
Application 1,
CN201610357935.4 discloses a production method of environmentally friendly organic pigment permanent red FGR, which is characterized by including the following steps: putting 2,4,5-trichloroaniline into a high-speed beating tank for beating and grinding, Add water, sulfuric acid, hydrochloric acid and antistatic agent SN to the diazotization tank, put the 2,4,5-trichloroaniline slurry into the diazotization tank, and add dissolved sodium nitrite to the diazotization tank. Carry out diazotization to obtain diazo liquid; add water and liquid alkali to the chemical tank to raise the temperature, then add red oil, benzoic acid, poly12-hydroxystearate dispersant, calcium acetylacetonate and naphthol AS-D , obtain the coupling liquid, add bottom water, concentrated sulfuric acid and polyhydroxystearic acid to the coupling tank, add the coupling liquid to the coupling tank, add the diazo liquid to the coupling tank, wash with water, suction filter and dry, the product of the invention It has excellent durability, high light resistance and weather resistance, and greatly reduces production costs and emissions of three wastes.
Application 2,
CN200910302006.3 discloses a method for preparing pigment red, especially a method for preparing C.I.112 pigment red FGR. It mainly solves the technical problems existing in the existing technology, such as the use of pigments causes environmental pollution, the hydrophilic application performance of the pigment itself is poor, and the reaction conversion rate is not high. The steps of the invention are: adding nonionic surfactant to water to prepare a mixed liquid, adding 2.4.5-trichloroaniline to the mixed liquid, and then adding hydrochloric acid, cationic surfactant and sodium nitrite to prepare a diazo liquid. ;Add liquid caustic soda to the water, raise the temperature, add rosin resin to completely dissolve it, add naphthol AS-D to maintain, and lower the temperature to obtain a naphthol AS-D alkaline solution; add nonionic surfactant to sulfuric acid, and then add naphthol AS-D alkaline solution, stir thoroughly to obtain naphthol AS-D coupling liquid; filter the diazo liquid and add it to the naphthol AS-D coupling liquid for coupling reaction. After the reaction is complete, stir fully, filter, wash and dry. , crushed to obtain the finished product.
References
[1][Chinese invention] CN201810559404.2 A 2,4,5-trichloroaniline production device and method
[2] CN201610357935.4 Production method of environmentally friendly organic pigment permanent red FGR
[3]CN200910302006.3 A preparation method of C.I. Pigment Red 112
