Method for low temperature preparation of isopropanol

Abstract

The invention discloses a method for low temperature preparation of isopropanol; acetone is added with hydrogen and subjected to a reaction under the action of a catalyst to generate isopropanol, and the specific steps include that a carbon-based material is used as a carrier to prepare the double-metal supported catalyst represented by M1-M2/C, wherein M1 is selected from one of Mo, Au and Ru, and M2 is selected from one of Re, Ag and Mn; liquid acetone is placed in a batch autoclave, the prepared catalyst is added, hydrogen is introduced, the reaction is carried out for a period of time, and thus isopropanol is obtained. The operation temperature for preparing isopropanol is low, the reaction is quick, the conversion rate is high, and the product has high selectivity.

Description

technical field [0001] The invention relates to isopropanol preparation technology, in particular to a method for preparing isopropanol at low temperature. Background technique [0002] The demand for phenol in my country is relatively large, and domestic phenol manufacturers mostly adopt the cumene peroxidation method and realize the co-production with acetone. The increase in phenol production has brought about the excess production of acetone, and there has been an imbalance between supply and demand. Considering the market space of isopropanol, hydrogenation of acetone to produce isopropanol is an economically feasible route. The process of hydrogenation of acetone to isopropanol is easy to produce by-products such as ethers. The purity of the product in the reaction process determines the cost of the later separation, and also determines the quality of the final product to a certain extent. Patent CN1083415C uses the CuO-ZnO mixture formed by pressing as a catalyst, an...

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Problems solved by technology

Japanese patent Ping-41038, Soviet patent SU1118632A introduced acetone hydrogenation method using Cu-Cr catalyst, Russian patent RU2047590 used catalysts containing NiO, CuO and other components, but the conversion rate of these catalysts was not high and the selectivity was poor , the use of Cr2O3 as an additive will cause environmental pollution at the same time, which does not meet the requirements of green chemical industry

CN103030525A has reported a kind of method that acetone liquid phase hydrogenation prepares isopropanol, but reaction temperature is higher, at 100~200 ℃, reaction time is longer (4 hours), and the conversion rate of acetone is more than 96%, and isopropanol The selectivity is greater than 95%

The performance of the catalysts used in the above acetone hydrogenation process is not ideal, the temperature required for the reaction process is high, the reaction time is long, the operating conditions of the pressure have high requirements on the equipment, and the conversion rate of acetone and the selectivity of isopropanol cannot be simultaneously high. standard, resulting in high production cost, heavy burden on the later separation link, high energy consumption and low efficiency, making it difficult to meet the requirements of green chemical industry