A kind of method that cyclohexanol directly absorbs NOx exhaust gas to synthesize adipic acid
A technology of cyclohexanol and adipic acid, applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylate and other directions, can solve the problems of complex process flow, high production cost, environmental hazards, etc., and achieves low reaction temperature. , Simple equipment, low energy consumption
Inactive Publication Date: 2016-05-04
HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI +1
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Problems solved by technology
But the preparation adipic acid technique of above bibliography all will use a large amount of acid, H 2 o 2 Or various catalysts, etc., the process is complicated, there are still equipment corrosion problems, high production costs, and there are still certain harms to the environment, which is not conducive to promotion
Method used
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Embodiment 1
[0012] NOx exhaust gas discharged from thermal power plants and air drawn in (NO in NOx is not absorbed by cyclohexanol, but NO is converted into NO after contacting air 2 and absorbed) enter the absorption tower together (tower inner diameter 24mm, height 1800mm, glass earring packing inside), control the NOx flow rate to 0.3L / min, and gradually drop cyclohexanol into the absorption tower through the constant pressure dropping funnel at the top of the tower 500g, carry out normal temperature countercurrent spray absorption, the oxidation reaction will occur immediately after the absorption liquid falls into the reaction bottle under the tower, the reaction temperature is controlled at 50-60°C, and the generated gas (mainly N 2 ) is pumped into the absorption tower, and is exported from the top of the tower to be evacuated into the atmospheric sampler; after the reaction is over, it is cooled, filtered with suction, and the filtrate is supplemented with new cyclohexanol, and th...
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The invention discloses a method for directly absorbing an NOx waste gas to synthesize adipic acid through cyclohexanol and belongs to the technical field of fine chemical engineering. The method comprises the following steps: (1) with the NOx waste gas as a catalyst, directly absorbing the NOx waste gas to synthesize the adipic acid with cyclohexanol; and (2) after oxidative reaction is ended, cooling, carrying out suction filtration and supplementing new cyclohexanol to the filtrate, carrying out oxidative reaction, operating in cycle, crystallizing and drying to obtain the adipic acid. Compared with a traditional technology, the method is simple in technology and convenient to operate; a nitric acid oxidation device and a tail gas absorption device in reaction can be omitted; and meanwhile, the method is very suitable for management and comprehensive utilization of the NOx waste gas and has obvious economic and social benefits.
Description
technical field [0001] The invention relates to a method for synthesizing adipic acid by directly absorbing NOx waste gas with cyclohexanol, which belongs to the technical field of fine chemical industry. Background technique [0002] Adipic acid is an important fine chemical raw material and organic synthesis intermediate, mainly used in the synthesis of nylon 66, polyurethane plastics, plasticizers and lubricants; in the organic synthesis industry, it is the basis of adiponitrile and hexamethylenediamine Raw materials are widely used in medicine, food, pesticides, spices, dyes, aviation coatings, etc., and the industrial demand is huge. The traditional industrial production of adipic acid is to use cyclohexane as the starting material, and use air or oxygen to oxidize cyclohexane into a mixture of cyclohexanol and cyclohexanone, that is, KA oil; then under the conditions of cobalt salt and copper-vanadium catalyst Nitric acid oxidation of KA oil is carried out under the f...
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IPC IPC(8): C07C55/14C07C51/31
CPCC07C51/316C07C55/14
Inventor 庄玉伟张金明郭辉张国宝王华芬李晓川曹健张深松赵根锁
Owner HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI