Dilute hydrogen nitrate concentration technique in hexanedioic acid production
A technology of dilute nitric acid and adipic acid, applied in the field of dilute nitric acid concentration, can solve the problems of large water consumption, large steam consumption, difficulty in expanding production of adipic acid production equipment, etc. The effect of saving steam consumption
Active Publication Date: 2010-08-11
PETROCHINA CO LTD
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Problems solved by technology
The existing concentration of nitric acid not only consumes a lot of water and steam, but also produces a large amount of waste water, which brings great difficulties to the further expansion of adipic acid production equipment.
Method used
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[0021] Example: Refer to Figure 1. In the dilute nitric acid concentration device in the production of adipic acid of the present invention, the diameter of the concentration tower A and the concentration tower B is 4 meters and the height is 22 meters. There are 25 layers of trays inside. Concentration tower A and concentration tower B have dilute nitric acid inlets. The upper part of the concentration tower A and the concentration tower B has a spray water pipe 1. There are steam outlets at the top of the concentration tower A and the concentration tower B. The bottoms of the concentration tower A and the concentration tower B have an outlet for concentrated nitric acid, the outlet for concentrated nitric acid is connected to a heat exchanger A, and the heat exchanger A has a pipeline connected to a pump (5). The pump (5) is a centrifugal pump. Heat exchanger A and heat exchanger B are of tube and tube type. The pump (5) is connected to the dilute nitric acid inlet of th...
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Abstract
The invention is used for the nitrate concentration in the process of producing adipic acid by taking the mixture of nitric acid and cyclohexane and cyclohexanone as the raw materials. The invention is characterized by improving the dilute nitric acid concentration device in adipic acid production, adopting double-concentration tower and improving the dilute nitric acid concentration technique inadipic acid production. In this way, the concentration of the concentrated nitric acid can reach the production requirements so as to adapt to the improved technique of dilute nitric acid concentration. By the improvement of the technique and device of dilute nitric acid concentration, the enhance of evaporation capacity of the concentration tower, the save of steam consumption and energy and thesewage discharge can be reduced finally in the process of dilute nitric acid concentration in adipic acid production.
Description
Technical field [0001] The invention relates to the technical field of petrochemical production, in particular to a device for concentrating dilute nitric acid and a process for concentrating dilute nitric acid in the process of producing adipic acid using a mixture of nitric acid, cyclohexane and cyclohexanone as raw materials. Background technique [0002] In 1974, Liaoyang Petrochemical Company introduced the adipic acid production technology of the French Longbury Company. It uses nitric acid as a raw material to react with a mixture of cyclohexane and cyclohexanone to produce adipic acid, with an annual output of 57,000 tons of adipic acid. Since the reaction process takes an excess of nitric acid, the dilute nitric acid solution produced in the reaction process for the production of adipic acid needs to be concentrated and recycled. The nitric acid concentration tower in the production equipment concentrates dilute nitric acid with a concentration of about 20-30% generated ...
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IPC IPC(8): C01B21/44C07C51/27C07C55/24
Inventor 沈殿成王德义赵建国惠春周亚绵沙有金冯素征刘家伟
Owner PETROCHINA CO LTD