Method of continuous catalytic synthesis of 1-alkoxyl-1,1,2,2-tetrafluoroethane in fixed bed

Abstract

The invention discloses a method of continuous catalytic synthesis of 1-alkoxyl-1,1,2,2-tetrafluoroethane in a fixed bed. The method comprises the following steps: (1) carrying out a reaction on a chloromethylated polystyrene sphere, trimethylamine and fluorine-containing fatty amine in a weight ratio of 100:(20-50):(5-20), wherein the reaction temperature is 30-50 DEG C and the reaction time is 5-20 hours, and after reaction, obtaining a strongly basic solid catalyst with multifunctional groups; (2) filling tetrafluoroethylene and alcohol into the fixed bed of the catalyst obtained in the step (1) to react, wherein the reaction condition is that the alkene and alcohol ratio is 1-4, the air speed is 1-3 / h, the reaction pressure is 0.1-0.8MPa and the reaction temperature is 20-60 DEG C, and collecting reaction products for gas-liquid separation to obtain a 1-alkoxyl-1, 1, 2, 2-tetrafluoroethane product. The method disclosed by the invention has the advantages of simple process, high yield, less three wastes and easiness in industrialization.

Description

technical field [0001] The invention relates to a production method of 1-alkoxy-1,1,2,2-tetrafluoroethane, in particular to a fixed-bed continuous catalytic synthesis of 1-alkoxy-1,1,2,2-tetrafluoroethane Methods. Background technique [0002] 1-Alkoxy-1,1,2,2-tetrafluoroethane has excellent properties such as low toxicity, low global warming potential and low greenhouse effect, compared with long carbon chain perfluoroalkyl compounds, It has fewer fluorine atoms, low price, and low long-term residual rate in the environment. It can be used as a refrigerant with excellent cleaning performance, foaming agent, cleaning agent, aerosol and waterproof drying solvent, and can also be used to produce polyurethane Foam or polyisocyanurate foam blowing agent, its performance is under development, the market prospect is promising. [0003] The preparation routes of hydrofluoroethers mainly include: hydroalkoxylation of unsaturated hydrocarbons and alcohols, and alkylation of acid fl...

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Problems solved by technology

[0006] The above patents and literature technologies use alkali metal compounds as catalysts. The catalysts are difficult to recover, the slag content is high, the product and the catalyst are difficult to separate, and there are disadvantages such as complex and cumbersome processes, low yields, and difficulty in industrialized large-scale production. easy to cause environmental pollution