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HFC-125 synthesis catalyst and preparation method thereof

A HFC-125, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Achieve the effect of good catalytic performance, high conversion rate and selectivity, and high stability

Active Publication Date: 2016-07-06
QUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing chromium-based catalysts mainly have the following deficiencies: (1) chromium-based catalysts will produce chromium-containing waste residue, causing environmental pollution; (2) chromium-based catalysts are prone to carbon deposition during the reaction process and the catalyst life is not long
The catalyst avoids the use of chromium, but its preparation method will lead to uneven distribution of active sites, and it is easy to lose and cause a decrease in activity

Method used

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  • HFC-125 synthesis catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Al(NO 3 ) 3 9H 2 O8 1.80g (0.250mol), Mg(NO 3 ) 2 ·6H 2 O96.16g (0.375mol), Zn(NO 3 ) 2 ·5H 2 O111.56g (0.375mol) was prepared into 300mL mixed solution I with deionized water, and 40g of sodium hydroxide and 6.62g of sodium carbonate were prepared with deionized water into 300mL mixed solution II. Then, the mixed solution I and the mixed solution II were quickly added to the rotary liquid film reactor and mixed vigorously. After the mixing was completed, they were transferred to a 1L four-necked flask, and crystallized at 60°C for 48 hours, and washed with deionized water until neutral. After filtering, the filter cake was dried at 80°C and ground to obtain multi-component hydrotalcite. Then it was calcined at 450°C for 4h under normal pressure and under the protection of nitrogen to obtain a fluorination catalyst, which was activated by treating with anhydrous HF at 400°C for 12h before use. The reactivity and selectivity are listed in Table 1.

Embodiment 2

[0029] Al(NO 3 ) 3 9H 2 O40.90g (0.125mol), Fe(NO 3 ) 3 9H 2 O50.50g (0.125mol), Mg(NO 3 ) 2 ·6H 2 O32.05g (0.125mol), Zn(NO 3 ) 2 ·5H 2 O111.56g (0.375mol) was prepared into 300mL mixed solution I with deionized water, and 30g sodium hydroxide and 5.62g sodium carbonate were prepared with deionized water to make 300mL mixed solution II. Then, the mixed solution I and the mixed solution II were quickly added to the rotating liquid film reactor and mixed vigorously. After the mixing was completed, they were transferred to a 1L four-necked flask, and crystallized at 75°C for 36 hours, and washed with deionized water until neutral. After filtering, the filter cake is dried at 100°C and ground to obtain multi-component hydrotalcite. Then it was calcined at 300°C for 8h under normal pressure and under the protection of nitrogen to obtain a fluorination catalyst, which was activated by treating with anhydrous HF at 350°C for 24h before use. The reactivity and selectivity...

Embodiment 3

[0031] Al(NO 3 ) 3 9H 2 O58.90g (0.18mol), Fe(NO 3 ) 3 9H 2 O72.72g (0.18mol), Mg(NO 3 ) 2 ·6H 2 O92.30g (0.36mol), Zn(NO 3 ) 2 ·5H 2 O107.10g (0.36mol) was prepared into 300mL mixed solution I with deionized water, and 43.00g of sodium hydroxide and 9.39g of sodium carbonate were prepared with deionized water into 300mL mixed solution II for later use. The mixed solution I and the mixed solution II were quickly added to the rotating liquid film reactor and mixed vigorously. After the mixing was completed, they were transferred to a 1L four-necked flask, and crystallized at 100°C for 6 hours, and washed with deionized water until neutral. Filter, dry the filter cake at 105°C, and grind to obtain multi-component hydrotalcite. Then it was calcined at 550°C for 2h under normal pressure and under the protection of nitrogen to obtain a fluorinated catalyst, which was activated by treating with anhydrous HF at 300°C for 36h before use. The reactivity and selectivity are ...

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Abstract

The invention discloses a HFC-125 synthesis catalyst, which is multi-element hydrotalcite. The chemical formula of the catalyst is [M<2+><1-x>M<3+><x>(OH)2]<x+>(A<n-><x / n>).mH2O, wherein M<2+> and M<3+> represent a divalent metal ion and a trivalent metal ion respectively, A<n-> represents an negative ion, and x represents the mole ratio of M<3+> to (M<2+> + M<3+>). The prepared catalyst is applied to gas phase fluorination between HCFC-123 and HCFC-124 to synthesize 2,3,3,3-tetrafluoropropylene HCFC-125 and has the advantages that the active component cannot be lost easily, the catalytic performance is good, and the selectivity is high.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a catalyst for synthesizing pentafluoroethane ((HFC-125) and a preparation method thereof. Background technique [0002] Pentafluoroethane (HFC-125) has an ODP value (Ozone Depletion Potential) of 0 and is widely used as a refrigerant and blowing agent as a substitute for chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) , solvents, propellants, fire extinguishers and dry etchants. [0003] HFC-125 often uses HCFC-123 (1,1-dichloro-2,2,2-trifluoroethane) and HCFC-124 (1-chloro-1,2,2,2-tetrafluoroethane) as The raw materials are fluorinated for synthesis. HCFC-123 and HCFC-124 are prepared by liquid-phase fluorination of tetrachloroethylene (PCE). [0004] US Patent No. 6,479,718 discloses a method for preparing HCFC-123 by a liquid phase method, using hydrogen fluoride and tetrachloroethylene as raw materials, and Sb(Ⅴ) as a catalyst. When the reaction temperature is 90...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J23/80B01J23/825C07C17/20C07C19/08
CPCB01J23/007B01J23/06B01J23/80B01J23/825C07C17/206C07C19/08
Inventor 王玉林吕亮陈剑君
Owner QUZHOU UNIV
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