A kind of recovery method of ammonia in the process of producing 4-aminotrifluorotoluene
A technology of aminobenzotrifluoride and recovery method, which is applied in the field of ammonia recovery in the production of 4-aminobenzotrifluoride, can solve the problems of waste of resources, environmental pollution, etc., reduce pollution, increase economic benefits, and lower outlet temperature Effect
Inactive Publication Date: 2015-12-09
NANTONG HAISHENG PHARMA
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[0002] For a long time, in the process of producing 4-aminotrifluorotoluene, liquid ammonia should be used as raw material during ammoniation, and a large amount of ammonia gas will be generated during reaction and decomposition. The original process only takes simple measures for this and then directly empties it. The environment has caused a lot of pollution, and a large part of resources (ammonia) was wasted
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[0015] Such as figure 1 Shown, the recovery method of ammonia in a kind of production 4-aminotrifluorotoluene technique comprises the following steps:
[0016] (1) Inject tail suction ammonia water into the vacuum pump water tank, add process water to the first-level falling film absorption tank to 3 / 4 of the liquid level sight glass, and add clear water to the second-level falling film absorption tank to 3 / 4 of the liquid level sight glass , if there is no dilute ammonia water in the second-level falling film absorption tank, add process water to 3 / 4 of the liquid level sight glass, and open the circulating water inlet and outlet valve of the third-level water spray absorption tower;
[0017] (2) After the high-pressure synthesis post is notified of pressure relief and material pressing, open the frozen brine inlet and outlet valves of the first-stage falling film absorption tower and the circulating water inlet and outlet valves of the second-stage falling-film absorption to...
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The invention discloses a method for recycling ammonia gas in a process of producing 4-aminotrifluorotoluene. The method comprises the following steps: injecting exhaust-absorbing ammonia water into a vacuum pump water tank, adding process water into a primary falling-film absorption tank, adding clean water and process water into a secondary falling-film absorption tank, opening a tertiary water-spraying absorption tower, opening a primary falling-film absorption tower and a secondary falling-film absorption tower, sampling the circularly-absorbed ammonia water and submitting the circularly-absorbed ammonia water for inspection, pumping the circularly-absorbed ammonia water to a material-washing ammonia water high-level tank at a material-washing station from an ammonia water storage tank, and directly pumping the circularly-absorbed ammonia water into an exported ammonia water tank truck from the ammonia water storage tank after sampling the ammonia water and submitting the ammonia water for inspection if needing to export the ammonia water. The method has the beneficial effects of greatly reducing the emission of the waste gas of the ammonia gas when recycling useful materials, thereby reducing the pollution to the environment and increasing the economic benefit.
Description
technical field [0001] The invention relates to a 4-aminobenzotrifluoride process, in particular to a method for recovering ammonia in the process of producing 4-aminobenzotrifluoride. Background technique [0002] For a long time, in the process of producing 4-aminotrifluorotoluene, liquid ammonia should be used as raw material during ammoniation, and a large amount of ammonia gas will be generated during reaction and decomposition. The original process only takes simple measures for this and then directly empties it. The environment has caused great pollution, and a large part of resources (ammonia) have been wasted. Ammonia gas is very soluble in water, so it can be considered to absorb tail ammonia with water and convert it into ammonia water which is relatively convenient for storage. Ammonia water can be used as workshop raw material (washing post) or directly exported, which can reduce the impact on the environment. Pollution, but also to obtain economic benefits, th...
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IPC IPC(8): B01D53/14
Inventor 江耀田杨劲松朱春雷盛海涛陈虹
Owner NANTONG HAISHENG PHARMA