Method for resource utilization of fluoroform

A technology of trifluoromethane and fluorodichloromethane, applied in chemical instruments and methods, chlorodifluoromethane production, organic chemistry, etc., can solve the problems of many by-products, serious carbon deposition, high reaction temperature, etc. Effects of cost, life extension, and product selectivity improvement

Active Publication Date: 2015-05-20
ZHEJIANG LANTIAN ENVIRONMENTAL PROTECTION HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, all these technologies have a very big common problem, that is, if under the conditions of gas phase cracking reaction, a certain conversion rate is required, the reaction temperature is high, there are many by-products, and serious carbon deposition

Method used

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  • Method for resource utilization of fluoroform
  • Method for resource utilization of fluoroform
  • Method for resource utilization of fluoroform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Pass trifluoromethane and fluorodichloromethane at a ratio of 1:1 (molar ratio) into a reactor containing 50ml of pretreated chromium trioxide catalyst, at a temperature of 350°C, a pressure of 2bar, and a space velocity of 2000h -1 react under the conditions. The pretreatment process of chromium trioxide is fluoridation treatment at 400°C for 2 hours in a mixed atmosphere of 10% hydrogen fluoride and 90% nitrogen, and finally 5 hours at 400°C with hydrogen fluoride. The conversion rate of trifluoromethane is 89%, and the selectivity of difluorochloromethane is 98%. In addition to some unreacted trifluoromethane and monofluorodichloromethane, there are traces of methane and CO in the tail gas. 2 Wait for gas. After the tail gas separates and collects difluorochloromethane, the remaining gas circulates into the reactor to continue to react with trifluoromethane.

Embodiment 2

[0031] Pass trifluoromethane and trichloromethane at a ratio of 2:1 (molar ratio) into a reactor containing 50ml of pretreated chromium trioxide catalyst, at a temperature of 350°C, a pressure of 2bar, and a space velocity of 2000h -1 react under the conditions. The pretreatment process of chromium trioxide is fluoridation treatment at 400°C for 2 hours in a mixed atmosphere of 10% hydrogen fluoride and 90% nitrogen, and finally 5 hours at 400°C with hydrogen fluoride. The conversion rate of trifluoromethane is 95%, and the selectivity of difluorochloromethane is 95%. In addition to some unreacted trifluoromethane and monofluorodichloromethane, there are traces of methane and CO in the tail gas. 2 Wait for gas. After the tail gas separates and collects difluorochloromethane, the remaining gas circulates into the reactor to continue to react with trifluoromethane.

Embodiment 3

[0032] Example 3 catalyst preparation

[0033] 10.09g Sm(NO 3 ) 3 Dissolve in 205ml of distilled water to make impregnating solution, impregnate on 100g of MgO carrier with high specific surface area, age for 12h after impregnating for 5 hours, dry the water in an oven at 110°C for 12h, and dry at 400°C N 2 Roasting under the atmosphere for 5h, the prepared 5.2wt%Sm 2 o3 / MgO catalyst. The prepared catalyst was evaluated according to the raw material composition, pretreatment process and reaction conditions of Example 1, and the evaluation results are shown in Table 1.

[0034] 14.04g La(NO 3 ) 3 6H 2 O was dissolved in 225ml of distilled water to make a solution, and 100g of high specific surface area Al 2 o 3 Dispersed in La(NO 3 ) 3 solution, a suspension was formed, to which 20% NH 3 water solution, and at the same time turn on the magnetic stirring until the pH = 9~11, stop the reaction, let it stand for aging for 12 hours, then carry out suction filtration, dr...

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Abstract

The invention discloses a method for resource utilization of fluoroform. The method is characterized by mixing fluoroform with one or a plurality of halohydrocarbon, converting the mixture into a product containing monochlorodifluoromethane in the presence of a catalyst, and reacting unreacted fluoroform with other reaction products in a reactor. According to the method, chlorofluorocarbon containing chlorine or bromine or chlorofluorocarbon which contains chlorine or bromine and needs to be processed during a production process is utilized as reaction material to perform chlorine / fluorine exchange reaction with fluoroform to prepare monochlorodifluoromethane, better economic benefits and social benefits are provided; and in products, monochlorodifluoromethane can be recycled though separation, remained waste gas does not need to be processed, and can still enter the reactor as gas reacted with fluoroform, the conversion rate of reactants is improved, and zero-discharge is realized.

Description

technical field [0001] The present invention relates to a method for resource utilization of trifluoromethane and its catalyst and preparation method, especially a method of using chlorofluorocarbons such as difluorochloromethane, fluorodichloromethane, etc. and trifluoromethane under the condition of the presence of a catalyst Response, the production method of products with higher added value. Background technique [0002] Trifluoromethane (CF 3 H, HFC-23) is a by-product of the reaction of HF and chloroform to form difluorochloromethane (HCFC-22, difluorochloromethane), and its content in the generated difluorochloromethane (R22 for short) is about 1.5-3wt%, but difluorochloromethane is excluded because it is the basic raw material for the production of TFE (tetrafluoroethylene), PTFE (polytetrafluoroethylene) and other hydrofluorocarbons (HFCs) The "Montreal Protocol" and the follow-up "Kyoto Protocol" are excluded from the emission reduction items stipulated in the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C19/10C07C17/00C07C17/20B01J23/10B01J23/06B01J23/04B01J23/745
CPCY02P20/40Y02P20/584
Inventor 韩文锋唐浩东李瑛刘化章
Owner ZHEJIANG LANTIAN ENVIRONMENTAL PROTECTION HI TECH
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