Hydrogen fluoride adsorbent and its preparation method and uses

A hydrogen fluoride and adsorbent technology, applied in the field of hydrogen fluoride adsorbent, can solve the problems of high equipment requirements, difficult separation and recovery of hydrogen fluoride, fluorine pollution, etc., and achieves the effect of high adsorption rate and selectivity, full and effective utilization, and avoiding fluorine pollution.

Active Publication Date: 2006-09-27
ZHEJIANG XINGTENG CHEM +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The recycling and use of a large amount of this fluorine-containing hydrochloric acid causes serious fluorine pollution
Compression, freezing, and distillation are also used to separate HF. This method requires high equipment and high energy consumption, and because hydrogen fluoride and fluorinated main and by-products will form azeotropes or azeotrope-like substances, this method is difficult to completely separate and recover hydrogen fluoride.
For this reason, the British Imperial Chemical Industries Company proposed a hydr

Method used

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  • Hydrogen fluoride adsorbent and its preparation method and uses

Examples

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preparation example 1

[0020] Weigh 20kgKF, 50kgNaF, and 20kgKF·HF into a mixer and mix evenly, take it out and add it to a ball mill to crush it into powders of about 100 meshes, take it out and add it to the mixer and add 5 kg of water glass with a modulus of 3, mix it evenly, and then add an appropriate amount of water. Make it reconcile into a dough shape, extrude it with an extruder, cut it into particles of φ4-6×6-8mm, put it in an oven at 105-110°C, and dry it for 24 hours.

[0021] Adsorbent preparation example 2

[0022] Weigh 30kgKF, 30kgNaF, 40kgBaF 2 (do not add hydrogen fluoride), except that, other are all implemented by Preparation Example 1

[0023] Adsorbent preparation example 3

[0024] Weigh 40kgLiF, 30kgBaF 2 , 30kgKF.HF are put into mixer and mix homogeneously, take out and add ball mill and be pulverized into powders of about 100 orders, take out and add mixer, and add 5kg silica-containing alumina powder, other are implemented by preparation example 1.

[0025] Adsorbent ...

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Abstract

The selective hydrogen fluoride adsorbent is prepared with alkali metal fluoride, alkali earth metal fluoride and/or alkali metal fluorohydride, and through mixing, crushing into 50-120 mesh fine powder, mixing with silicon containing bauxite powder, alumino silica powder and/or water glass in 2-25 wt%, adding proper amount of water and blended into dough-like matter, extrusion to form, pelletizing and stoving. The adsorbent is suitable for adsorption of HF gas from mixed gas in the production of CFC, HCFC, HFC, SO2F2, etc with excessive HF as fluoridizer, and may reach a HF recovering rate as high as 95-99 %.

Description

technical field [0001] The present invention relates to a hydrogen fluoride adsorbent and its preparation method and application, especially in the preparation of chlorofluoroalkane (CFC), hydrochlorofluoroalkane (HCFC) and hydrofluoroalkane through fluorination reaction with excess hydrogen fluoride as fluorinating agent (HFC) and sulfuryl fluoride (SO 2 f 2 ) and other products, the selective adsorption, separation and recovery of hydrogen fluoride in the mixed gas of the reaction. Background of the invention [0002] Preparation and production of CFC, HCFC and HFC refrigerants, blowing agents and fumigants sulfuryl fluoride (SO 2 f 2 ) and other product processes, usually all use excess hydrogen fluoride as fluorinating agent, and the crude product of fluorination contains excess hydrogen fluoride, which must be separated and recycled. In the prior art, the by-product hydrochloric acid is usually produced by absorbing tail gas with water , and diss...

Claims

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Application Information

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IPC IPC(8): B01J20/04B01D53/04C01B7/19C07C17/20C07C17/38
Inventor 金正义毛建新蔡吉栋
Owner ZHEJIANG XINGTENG CHEM
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