氯化钠废盐制铵碱的气液反应过程强化研究

doi:10.19964/j.issn.1006-4990.2022-0085

Abstract

Abstract:

In order to solve the harm of sodium chloride waste salt to the environment，Hou De‐bang′s process was employed to the sodium chloride waste salt treatment process.A process for preparation of NaHCO₃ and NH₄Cl products from sodium chloride waste salt resources was developed.The airlift loop reactor for recycling of odium chloride waste salt was designed，and the intensification of gas-liquid reaction processes such as ammonification and carbonization in the resource utilization process of sodium chloride waste salt were studied.Computational fluid dynamics（CFD） software was used to study the flow and mass transfer in the circulation reactor，and the reliability of CFD simulation was confirmed by comparing the experimental value with the simulated value.The ammonification process，carbonization process and post-treatment process in the treatment of sodium chloride waste salt treatment were experimentally studied.Optimization of experimental conditions：under the condition of apparent gas velocity of 0.044 4 m/s，the time for ammonia gas to pass through the ammonification process was 70 min，the time for carbon dioxide to pass through the carbonization process was 105 min，and the time for ammonia gas to pass through the second ammonification process was 40 min.Under this condition，the purity of sodium bicarbonate and ammonium chloride was 89.68% and 85.11% respectively.The purity of ammonium chloride after recrystallization could reach 99.9%.The purity of sodium bicarbonate and ammonium chloride products all met the market demand.

Key words: sodium chloride waste salt, airlift loop reactor, numerical simulation, flow field analysis, resource utilization

CLC Number:

TQ131.12

SHEN Jiaqi,YAN Shenghu,ZHANG Yue,LIU Jianwu,SHEN Jiefa. Study on intensification of gas-liquid reaction process for sodium chloride waste salt to ammonium alkali[J]. Inorganic Chemicals Industry, 2022, 54(12): 99-105.

Figures/Tables 11

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Study on intensification of gas-liquid reaction process for sodium chloride waste salt to ammonium alkali

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