Hydrogen Fluoride Production via Solid-State Calcium Fluoride Reaction
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Solution Overview
Problem
Conventional methods for producing hydrogen fluoride face challenges due to the uneven distribution and high cost of high-quality fluorite, leading to issues with reactivity and corrosion, and the occurrence of a 'second pasty' state that causes equipment corrosion and energy inefficiency.
Innovation Solution
A method involving calcium fluoride particles with an average diameter of 1-40 μm, mixed with sulfuric acid at a specific molar ratio and temperature, to prevent the second pasty state by ensuring the reaction proceeds in a solid state, thereby reducing corrosion and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high quality fluorite from China is used as raw material, then hydrogen fluoride production efficiency is improved, but resource exhaustion concern arises and price increases due to export regulation
Solution Approach 1:
The invention changes the particle size parameter of calcium fluoride from conventional 80-100 μm to 10-50 μm, which fundamentally alters the reaction characteristics and enables the use of diverse calcium fluoride sources including lower quality materials, thereby reducing dependency on imported high-quality fluorite
Solution Approach 2:
The invention makes the production process universal by enabling the use of multiple calcium fluoride sources (different origins, qualities, and particle sizes) through optimized reaction conditions, making the process adaptable to various raw material scenarios and reducing resource availability concerns
2Productivity
If calcium fluoride particle size is reduced to 10-50 μm, then reaction efficiency is improved, but mixture consistency changes causing kneading equipment overload and adhesion
Solution Approach 1:
The invention optimizes multiple parameters simultaneously: particle size (10-50 μm), sulfuric acid concentration (93-98%), temperature (80-100°C), and molar ratio (1.05-1.20), which together improve reaction efficiency while maintaining mixture consistency that prevents equipment overload and adhesion
Solution Approach 2:
The invention applies local quality control by optimizing the specific particle size distribution and chemical composition in different regions of the reaction mixture to achieve uniform reactivity and prevent localized adhesion or inconsistency issues
3Quantity of substance
If reaction temperature is increased to 300°C in rotary kiln, then sulfuric acid regeneration is improved, but energy consumption increases and corrosion occurs
Solution Approach 1:
The invention performs preliminary reaction in a jacketed reactor at moderate temperature (80-100°C) before rotary kiln processing, pre-converting calcium fluoride to intermediate products that require less energy for subsequent sulfuric acid regeneration, thereby reducing overall energy consumption
Solution Approach 2:
The invention converts the potentially harmful high-temperature corrosion issue into a benefit by using the moderate temperature preliminary reaction to form stable intermediate products that protect the rotary kiln from severe corrosion while still achieving sulfuric acid regeneration through controlled degradation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for the use of various calcium fluoride sources, prevents corrosion, and reduces energy loss by maintaining the reaction mixture in a solid state, enhancing operational stability and efficiency.
Implementation Method 1
reacting calcium fluoride particles with sulfuric acid to produce hydrogen fluoride
Implementation Method 2
the reaction mixture is heated to an increased temperature while it rolls and advances... Ca(HSO4)2 in the reaction mixture degrades by a reaction
Implementation Method 3
Hydrogen fluoride (HF) generated by the reaction of the formula (3) is contained in a gas phase and taken out through the induction pipe 3
Data Source
AI summary
The present invention provides a novel method for producing hydrogen fluoride, which is capable of using various calcium fluoride sources and preventing a second pasty state from occurring, effectively.In a method for producing hydrogen fluoride by reacting calcium fluoride with sulfuric acid, following steps are conducted: (a) a step for mixing and reacting calcium fluoride particles having an average particle diameter of 1-40 μm with sulfuric acid at a sulfuric acid/calcium fluoride molar ratio of 0.9-1.1 under a temperature of 0-70° C. to obtain a solid-state reaction mixture; and (b) a step for heating the solid-state reaction mixture to a temperature of 100-200° C. to react with itself, and thereby producing hydrogen fluoride in a gas phase.