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Circulating fluidized bed system and method for production of hydrogen fluoride from fluorite powder

A circulating fluidized bed and fluorite powder technology, which is applied in the field of circulating fluidized bed technology, can solve the problems of excessive dispersant entrainment and difficulty in separation, and achieve the goal of inhibiting particle agglomeration and wall sticking, low conversion rate and high degree of wear Effect

Active Publication Date: 2017-11-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a big problem in the separation of the calcium sulfate discharged after the reaction and the dispersant. The dispersant is too entrained and difficult to separate, making it difficult to further develop the process.

Method used

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  • Circulating fluidized bed system and method for production of hydrogen fluoride from fluorite powder

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The mixed gas of sulfur trioxide, water vapor and HF with a molar ratio of 1:1:1.5 is used as the raw material gas, preheated to 300 degrees Celsius, at 10.0m 3 / h gas velocity enters the reactor inlet pipe, mixes with circulating solids and enters the reactor for reaction. The reactor operates at a temperature of 350 degrees Celsius and a pressure of 1.2 bar. The output reaction product with incompletely reacted solid enters the circulation part, and enters a cyclone separator to separate incompletely reacted solid particles with larger particle size. The pressure drop of the primary cyclone separator is 0.05bar. Sinking solids enter the solids settling section, while gases and smaller solid particles with high conversion rates enter the solids separation section. The solid entering the solid settling section enters the inlet pipe through the lower inclined pipe and the control valve on it, mixes with the reaction gas and circulates back to the reactor. The length o...

Embodiment 2

[0039] Sulfuric acid vapor with a mass fraction of 98% and HF gas are mixed at a molar ratio of 1:1.5 as raw material gas, preheated to 350 degrees Celsius, and 8.0m 3 / h gas velocity enters the reactor inlet pipe, mixes with circulating solids and enters the reactor for reaction. The reactor operates at a temperature of 350 degrees Celsius and a pressure of 0.95 bar. Micro-negative pressure can reduce the chance of leakage of dangerous reactants and products. The reaction product with incompletely reacted solids produced by the reactor enters the circulation part, and the incompletely reacted solid particles with larger particle sizes are separated by the primary cyclone separator. The pressure drop of the primary cyclone separator is 0.05 bar. Sinking solids enter the solids settling section, while gases and smaller solid particles with high conversion rates enter the solids separation section. The solid entering the solid settling section enters the inlet pipe through th...

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Abstract

The invention discloses a circulating fluidized bed system and method for production of hydrogen fluoride from fluorite powder. The system comprises a reactor, a circulating part, a solid separation part and a gas condensation part, wherein the reactor is the place where a reaction takes place; the circulating part separates unreacted solids, allows the unreacted solids to settle and then returns the unreacted solids to the reactor for the reaction again; the solid separation part separates a gas-solid two-phase product and collects totally reacted solids as a solid product; and the gas condensation part liquefies and collects a gas product left after separation in the solid separation part. According to the invention, abnormal phenomena such as agglomeration and adhesion onto walls are avoided; mass transfer and heat transfer efficiency is improved; the circulation rate of a circulating fluidized bed is controlled by controlling the amount of gas and controlling the opening of a valve on an inclined tube, and the ratio of the separated solid product is controlled so as to control the reaction degree of the solids; liquid condensation is controlled via the temperature and amount of a condensate; and when the gas product contains other impurities, multi-stage condensers can be installed so as to control product quality.

Description

technical field [0001] The invention relates to a circulating fluidized bed process for producing hydrogen fluoride from fluorite powder. technical background [0002] Hydrofluoric acid (HF) is the basic product of the entire fluorine chemical industry. It is mainly used in the fluorocarbon industry, accounting for about 50% of the total consumption of hydrogen fluoride; followed by the production of electrolytic aluminum and aluminum fluoride and cryolite in the aluminum processing industry. Inorganic fluoride salts, accounting for more than 30%; again, metal pickling, catalysts for isobutane and butane alkylation reactions in refineries, and other fluorine-containing organic compound production industries. In recent years, my country's demand for anhydrous hydrogen fluoride has been increasing. [0003] Hydrogen fluoride is mainly produced by reacting fluorite with sulfuric acid. The reaction of calcium fluoride and sulfuric acid is an endothermic reaction, which needs t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/19B01J8/24
CPCB01J8/1836B01J8/1872B01J8/24C01B7/192
Inventor 黄正梁杨遥林王旻孙婧元刘仲玄王靖岱阳永荣蒋斌波廖祖维范小强王浩同訾灿
Owner ZHEJIANG UNIV
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