Cooperation mode：Transfer or cooperative production
Market price：The products of this project are important pesticides, dyes and pharmaceutical intermediates, and can also be used as emulsifiers, as well as for fabric treatment, etc., with a wide market and good development prospects.
Route of Synthesis：The project uses aniline, aluminum powder and propylene as raw materials, under the high temperature and high pressure, aniline and propylene reverse alkylation reaction, and then the crude DIPA product is refined to obtain the final product.
Equipment needed：Alkylation reactor | V = 10m3 | 3 units
Hydrolysis kettle|V=14.6m3|1 set of various types of towers and tanks 34 sets of heat exchangers 18 sets
Wastes：No waste water, 10 tons of waste gas per year, 220 tons of solid waste / year.
The project uses aniline, aluminum powder and propylene as raw materials, under the high temperature and high pressure, aniline and propylene reverse alkylation reaction, and then the crude DIPA product is refined to obtain the final product. The DIPA process mainly includes two parts: DIPA crude synthesis and DIPA product refining.
(1) DIPA crude synthesis
The aniline and aluminum powder are added to the alkylation reactor, and then heated by a heat transfer oil. As the reaction temperature increases, the aniline gradually dissolves and reacts slowly with the aluminum powder to form anilinolide. After the temperature rises to about 285 ° C, the pressure rises to 3.2-3.8 MPa, and the reaction lasts for about 2 hours, the hydrogen gas is condensed and cooled, and then vented through a 20 m high exhaust cylinder; after venting, propylene is introduced, and the reaction temperature is controlled at 310 ° C, The pressure is controlled at 4.5MPa, and the aluminum aniline reacts with propylene for about 35h to form 2,6-diisopropyl-aniline aluminum. After the material is cooled, it is transferred to the hydrolysis kettle, and soft water is added to the hydrolysis kettle to form a hydrolysis reaction. The crude DIPA and aluminum hydroxide precipitate and are to be refined in the next step.
(2) DIPA product refinement
After the hydrolyzed material enters the phase separator, the aqueous phase and the organic phase are separated by a phase separator, and the organic phase is temporarily stored in the crude material temporary storage tank; the aqueous phase and the aluminum hydroxide are dehydrated into the plate and frame filter press, and the filtrate is hydrolyzed. The kettle is recycled, and the filter cake is aluminum mud. The crude material in the temporary storage tower is continuously dewatered in the dehydration tower, and the dehydration tower is heated by heat-conducting oil. The water and a small amount of material collected at the top of the tower are condensed by the condenser and recycled from the inflowing hydrolyzer. The pump is driven into the light tower. The light components such as aniline, DIPA and o-isopropylaniline taken off the top of the light tower enter the dehydrogenation and de-recovery recovery tower, and the material of the tower kettle is pumped into the de-weighting tower. The finished product DIPA is produced at the top of the de-weighting tower, and the material at the bottom of the tower is driven into a dehydrogenation and de-recovery recovery tower. After the dehydrogenation and de-recovery recovery tower materials are subjected to rectification, the recovered light components are recycled to the alkylation reactor, and the collected heavy components are returned to the crude material temporary storage tank, and the rectification residue at the bottom of the tower is passed to the qualification department. Dispose of.
The reactor of this product is batch feed and the distillation section is continuous feeding. The batch of the reactor is about 40 hours. The plant is equipped with 3 sets of reactors and about 310 batches are produced annually.