Device for producing ammonium sulfate through neutralization and crystallization of caprolactam redischarge liquid and ammonia, and application of device

Abstract

The invention relates to a device for producing ammonium sulfate through neutralization and crystallization of caprolactam redischarge liquid and ammonia, and application of the device. The device comprises a DTB neutralizing and crystallizing device, wherein a built-in main condenser is arranged in the body of the DTB neutralizing and crystallizing device, and a tail condenser and a liquid condensing system are arranged outside the body; the main condenser is provided with a liquid collecting tank, a liquid collecting hopper, a condensate outlet and a condensate pipeline; and the tail condenser is matched with a vacuum facility and a liquid spraying system. Since the built-in main condenser is adopted, the pressure drop of an evaporation steam side in a condensation process is eliminated, the amount of evaporation steam discharged from the top of the neutralizing and crystallizing device is greatly reduced, and the pipe diameter and the arrangement difficulty of a top steam phase pipe are reduced; the tail condenser adopts a jet type vacuum condenser, low pressure drop and low temperature difference are realized, rapid condensation can be realized, and steam is not adopted for vacuumizing; circulating feed liquid of the neutralizing and crystallizing device or ammonium sulfate mother liquid in the device is used as supplementing liquid of spraying liquid, so no wastewater is generated during operation, and the environment is better protected; and a spraying liquid cooler adopts high-flow and low-temperature-rise circulating cooling water to keep the vacuum degree of a system stable.

Description

technical field [0001] The invention relates to the technical field of producing ammonium sulfate by reacting sulfuric acid and ammonia, in particular to a process device for producing ammonium sulfate by neutralizing and crystallizing caprolactam rearrangement liquid and ammonia and its application. Background technique [0002] At present, most domestic chemical production enterprises and some metallurgical enterprises often adopt neutralization crystallization process when dealing with by-product sulfuric acid or ammonia, and choose DTB neutralization crystallizer (draft tube baffle), that is, guide tube and baffle evaporation neutralization crystallization The device is a double-sleeved draft tube baffle plate, which is a typical internal circulation crystallizer with high circulation efficiency; the ammonia-containing stream and the sulfuric acid stream are passed into the DTB neutralization crystallizer together to realize the neutralization and crystallization process ...

AI Technical Summary

Problems solved by technology

[0014] In the sugar industry, the juice vapor (evaporation steam) produced during the vacuum sugar cooking and sugar crystallization process is large, the condensation load of the vacuum condenser is large, and the cooling water required is also large. Natural water such as river water is often used as cooling water. It has the characteristics of low inlet water temperature, unlimited outlet water temperature, and discharge after one-time use; this technology has the characteristics of stable vacuum degree and relative energy saving; It is suitable for the production needs of large-scale chemical equipment, and it does not meet the development concept of green environmental protection

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