Preparation method and application of fluoro-containing olefin cis-trans isomerization catalyst

A technology of cis-trans isomerization and fluorine-containing olefins, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, and preparation of halogenated hydrocarbons. Good catalytic effect and low cost

Inactive Publication Date: 2019-04-26
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process of these compounds, there is a phenomenon that the cis- and trans-configuration compounds coexist, resulting in a decrease in the yield of the target product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Catalyst preparation:

[0019] Take 145.1g Fe(NO 3 ) 3 , 40g CoCl 2 and 13.0 g NiCl 2 , and take 111.2g MgCl at a molar ratio of 1:1 2 and 129.59 g CaCl 2 Dissolve in an ethanol solution so that the mass of Fe, Co, and Ni is 30% of the mass of the prepared composite oxide, heat to 40°C, add 20g of urea and a certain amount of ammonia water to it, and adjust the pH value between 8.5 and 9.5 , aged for 2 hours, raised the temperature to 90°C, continued aging for 12 hours, filtered, washed the precipitated product until neutral, dried at 120°C, and calcined the obtained solid at 500°C for 6 hours to obtain a composite oxide.

[0020] Get 100g composite oxide, then be respectively 5% and 2% of the composite oxide quality that gets by the quality of Al and Zn, get 39.5g Al (NO 3 ) 3 and 1.0 g ZnCl 2 Soluble in water, uniformly impregnated on the composite oxide, baked in a muffle furnace at 450°C for 8 hours, and then punched into pieces. Put 100ml of the catalyst p...

Embodiment 2

[0024] Catalyst preparation:

[0025] Take 7.3g Fe(NO 3 ) 3 , 6.5g CoCl 2 and 2.6g NiCl 2 , another 325.6g of MgSO 4 Dissolve in an ethanol solution so that the mass of Fe, Co, and Ni is 5% of the mass of the prepared composite oxide, heat to 40°C, add 20g of urea and a certain amount of NaOH to it, and adjust the pH value between 8.5 and 9.5 , aged for 2 hours, raised the temperature to 90°C, continued aging for 12 hours, filtered, washed the precipitated product until neutral, dried at 120°C, and calcined the obtained solid at 500°C for 6 hours to obtain a composite oxide.

[0026] Get 100g composite oxide, then according to the quality of Al and Zn respectively 10% and 1% of the composite oxide quality taken, take a certain amount of AlPO 4 and ZnCl 2 Soluble in water, uniformly impregnated on the composite oxide, baked in a muffle furnace at 450°C for 8 hours, and then punched into pieces. Put 100ml of the catalyst precursor into a tubular reactor, raise the tempera...

Embodiment 3

[0030] The preparation and evaluation of the catalyst in this example were carried out in the same manner as in Example 1, except that the prepared composite oxide was directly used as the catalyst precursor instead of being impregnated with Al and Zn soluble salt solutions. During the evaluation process, cis-1-chloro-3,3,3-trifluoropropene and HCl were introduced into the reaction, the molar ratio of cis-1-chloro-3,3,3-trifluoropropene and HCl was 1:0.5, and the contact time The reaction time is 10 seconds, the reaction temperature is 150°C, and the conversion rate of Z-HCFC-1233zd is 60.5% and the selectivity of E-HCFC-1233zd is 94.2% according to gas chromatography.

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Abstract

The invention discloses a preparation method and an application of an isomerization catalyst and aims to solve the problem of low yield of a target product due to presence of an isomer in a productionprocess of the compounds. A precursor of the catalyst is prepared from composite oxide or the composite oxide which is impregnated with a certain amount of metal salt, the precursor of the catalyst is roasted at 350-450 DEG C, subjected to sheet forming and compression forming, and subjected to HF fluoridation at 200-400 DEG C, and the fluorination catalyst is prepared. The catalyst is mainly applied to a cis-trans isomerization reaction process of hydrofluoro olefin or hydrochlorofluoro olefin.

Description

technical field [0001] The invention relates to a preparation method and application of a cis-trans isomerization catalyst for fluorine-containing olefins, in particular to a cis-trans isomerization reaction of hydrofluoroalkenes or hydrofluorochloroalkenes. Background technique [0002] Many fluorinated alkenes can exist as cis / trans isomers based on the arrangement of substituents around the double bond, such as 1-fluoropropene (CH 3 CH=CHF), 1,2-difluoropropene (HFC=CFCH 3 ), 1,3-difluoropropene (CHF=CHCH 2 F), 1,2,3-trifluoropropene (CHF=CFCH 2 F), 1,3,3-trifluoropropene (CHF=CHCF 2 H), 1,3,3,3-tetrafluoropropene (CHF=CHCF 3 ), 1,2,3,3-tetrafluoropropene (HFC=CFCF 2 H), 1,2,3,3,3-pentafluoropropene (CHF=CFCF 3 )Wait. The corresponding trans and cis isomers usually have different physical or chemical properties and thus have different applications. Such as 1,3,3,3-tetrafluoropropene, the potential value of ozone depletion is 0, the potential value of greenhouse ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J23/78B01J23/86B01J37/26C07C21/18C07C17/358
CPCB01J23/002B01J23/78B01J23/80B01J23/866B01J37/26B01J2523/00C07B2200/09C07C17/358C07C21/18B01J2523/22B01J2523/23B01J2523/27B01J2523/31B01J2523/842B01J2523/845B01J2523/847B01J2523/67
Inventor 秦越吕剑王博寇联岗毛伟马辉涂东怀韩升赵波
Owner XIAN MODERN CHEM RES INST
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