A kind of device and method for producing ammonium sulfate

A technology of ammonium sulfate and crystallization reactor, which is applied in the direction of ammonium sulfate, etc., can solve the problems of high investment, many equipment, and failure to use, and achieve the effect of reducing investment and shortening the process

Active Publication Date: 2017-02-08
BEIJING HUAFU ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are two main problems in this production method: one is that neutralization and crystallization are carried out in two processes respectively, the process is long, the equipment is many, and the investment is high
The second is the unreasonable utilization of energy. The heat released by the neutralization reaction needs to be removed by circulating water, which cannot be utilized, and the crystallization process needs low-pressure steam to provide a heat source.

Method used

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  • A kind of device and method for producing ammonium sulfate

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specific Embodiment approach

[0041] The method for producing ammonium sulfate of the present invention, its preferred embodiment is:

[0042] It includes the following four processes: neutralization and crystallization process, amide oil decanting and storage and mother liquor circulation process, slurry thickening and centrifugal separation process, ammonium sulfate drying and washing process.

[0043] The neutralization and crystallization process flow includes the following steps: After the ammonia gas and the condensed water from the condensate collection tank 34 are fully mixed through the static mixer 48, the rearrangement liquid from the cyclohexanone oximation unit passes through the neutralization crystallization reactor 1 respectively The 4 nozzles on the inner annular distributor enter the draft tube 6 of the neutralization crystallization reactor 1 . In the guide tube 6, ammonia and sulfuric acid undergo a neutralization reaction to generate ammonium sulfate and produce crystal nuclei. With th...

specific Embodiment

[0054] Such as figure 1 As shown, it mainly includes a neutralization crystallization reactor 1, a thickener 2, a decanter 3, a centrifuge 4, and a fluidized bed dryer 5, which are connected by pipelines. The device of the present invention can react the rearrangement liquid from the upstream cyclohexanone oximation device with ammonia water to generate ammonium sulfate particles, which can be separated and dried to obtain ammonium sulfate products, and at the same time, the amide oil is separated and sent to the downstream caprolactam refining device for refining The caprolactam product is obtained.

[0055] During normal operation, the material in the neutralization crystallization reactor 1 maintains a pH value of 3-4, and the pressure is controlled at 7-17kPa (absolute pressure) by the vacuum system 47. The position is maintained at 45-55% by adding saturated mother liquor and condensed water, and the materials are fully mixed by the continuously running agitator 16 and t...

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Abstract

The invention discloses a device and method for producing ammonium sulfate. The device comprises a neutralization and crystallization reactor, a thickener, a decanter, a centrifugal machine and a fluidized bed dryer which are connected through a pipeline, wherein the thicker comprises a settling section, a thickening section and an elutriating section which are sequentially connected from top to bottom; the decanter is horizontal and is divided into a light-phase area and a heavy-phase area by a baffle plate; the centrifugal machine is a horizontal double-stage piston pushing type centrifugal machine; the fluidized bed dryer is a horizontal multi-stage fluidized bed dryer, and the interior of the dryer is divided into a feeder drying area and a product cooling area; the neutralization and crystallization reactor comprises a cylinder body in which an inner circulation passage formed by a flow guiding cylinder, a backflow baffle plate and a stirrer is arranged, and an outer circulation passage formed by a crystallizer circulating pump is arranged outside the cylinder body. According to the method for producing the ammonium sulfate, the ammonium sulfate is produced by a neutralization and crystallization one-step method, so that the energy can be saved and the power consumption can be reduced; in addition, the flow can be shortened, and the investment is reduced.

Description

technical field [0001] The invention relates to a caprolactam production technology, in particular to a device and method for producing ammonium sulfate (ammonium sulfate). Background technique [0002] Caprolactam is an important organic material, which is mainly used to prepare caprolactam resin, fiber and artificial leather, etc. It is also used as a raw material for medicine. In the past, my country needed to import a large amount. After continuous exploration and innovation in recent years, my country already has mature and advanced Caprolactam production technology, my country's caprolactam has entered a period of great development. About 1.5-1.6 tons of ammonium sulfate can be produced by producing 1 ton of caprolactam. With the construction of a large number of caprolactam plants, the output of byproduct ammonium sulfate will also increase significantly. [0003] In the production process of caprolactam, the rearrangement liquid (the mixture of caprolactam 50%wt and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/24
Inventor 汪勤亚刘廷斌魏巍林剑星寇恒林
Owner BEIJING HUAFU ENG
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