Platinum-based composite carbon aluminum catalyst and method for continuous production of 2B oil

Abstract

The invention discloses a platinum-based composite carbon aluminum catalyst and a method for continuous production of 2B oil. The catalyst takes carbon-coated foamed aluminum as a carrier and loads Pt, second noble metal and transition metal; the second noble metal is any one of Ru, Au and Pd; the transition metal is any one of Zn, Fe, Sn and Cu; and in the catalyst, the mass content of the Pt is0.6 to 1.9 percent, and the mass content of the second noble metal and the transition metal is 0.1 to 0.7 percent. The 2B oil (o-chloro-p-amino-toluene) is continuously produced by taking o-chloro-p-nitrotoluene as a raw material and platinum-based composite carbon aluminum as a catalyst and by a fixed bed; generation of dechlorination side reaction can be controlled under the condition of not adding a solvent and an inhibitor; under the optimal condition, the conversion rate of the raw material reaches to 100 percent, the selectivity of the target product is more than 99.9 percent and the dechlorination byproduct is less than 0.1 percent; and the catalyst has stable property, and the technical process is capable of saving resources and is environmentally-friendly.

Description

technical field [0001] The invention belongs to the technical field of catalytic hydrogenation, and in particular relates to a platinum-based composite carbon-aluminum catalyst and a method for continuously producing 2B oil by using the catalyst. Background technique [0002] O-chloro-p-aminotoluene (2B oil) is an important chemical intermediate, widely used in the fields of medicine, pesticides and dyes. p-Aminotoluene is a colorless, glossy flaky crystal, slightly soluble in water, soluble in ethanol, ether, benzene, hydrochloric acid, poisonous, and a strong methemoglobin forming agent. In industry, p-toluidine is mainly used as dye intermediate and pharmaceutical pyrimethamine intermediate. [0003] At present, the industry still adopts the traditional kettle-type process to produce o-chloro-p-aminotoluene. The raw material is the corresponding nitro compound: o-chloro-p-nitrotoluene. In fact, the raw material used in industry is a mixture, and o-chloro-p-nitrotoluene a...

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Problems solved by technology

Chinese patent 201710650447.7 discloses a method for preparing 2B oil by catalytic hydrogenation. This method is a kettle-type technology, using water as a solvent and platinum carbon as a catalyst. The reaction is carried out at 70°C and about 0.8MPa, and the conversion rate is 99.61 %, the by-products of dechlorination can be controlled below 0.16%. It may be due to the diffusion problem of the kettle process that the raw materials cannot be completely converted, and subsequent purification is required. The reaction dechlorination is relatively high, and water is generated, so the reaction liquid has a certain Corrosiveness, adding sodium hydroxide can neutralize a certain amount of hydrogen chloride, but it may also make the reaction move towards the side reaction of dechlorination

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