Catalyst for preparation of methyl ethyl ketone from sec-butyl alcohol, and preparation method for catalyst

Abstract

The invention provides a catalyst for preparation of methyl ethyl ketone from sec-butyl alcohol. The catalyst comprises the following components in parts by weight: 45-55 parts of CuO, 35-55 parts of SiO2 and 2-20 parts of MO, wherein MO is at least one of CaO, MgO, ZnO and Al2O3. MO is used for modifying the Cu / SiO2 catalyst, so that the catalyst has higher dehydrogenation activity and excellent thermal stability; meanwhile, through the addition of MO, the conversion rate is increased and the selectivity of methyl ethyl ketone is improved; the modified Cu / SiO2 catalyst is prepared by combining physical and chemical methods. A preparation process is simple; when the catalyst is used in a process for preparation of methyl ethyl ketone from sec-butyl alcohol through dehydrogenation, not only is a higher conversion rate of sec-butyl alcohol kept, but also the whole reaction can be carried out in an alkaline environment through the addition of ammonia water, the prepared catalyst is high in quality, the added citric acid can ensure a physical property of the catalyst, the quality of the catalyst can be also improved due to uniform particle diameter, and the conversion rate and the selectivity of the catalyst are further improved accordingly.

Description

technical field [0001] The invention relates to a catalyst for preparing methyl ethyl ketone from sec-butanol and a preparation method thereof. Background technique [0002] As an organic solvent, methyl ethyl ketone has a wide range of uses in industrial production, such as dewaxing of lubricating oil, coating industry and various resin solvents, vegetable oil extraction process and azeotropic distillation in the refining process. Its advantages are strong solubility, volatile The property is lower than that of acetone, and belongs to medium boiling point ketone solvent. Methyl ethyl ketone is also an intermediate for the preparation of medicines, dyes, detergents, fragrances, antioxidants and certain catalysts, synthetic anti-peeling agent methyl ethyl ketone oxime, polymerization catalyst methyl ethyl ketone peroxide, corrosion inhibitor methyl Pentynyl alcohol, etc., are used in the electronics industry as a developer after photolithography of integrated circuits. [0...

AI Technical Summary

Problems solved by technology

Although the nano-metal catalyst prepared in the Chinese patent CN1415591A improves the selectivity of ketone products without using other carriers, the preparation process of its nano-scale metal catalyst involves high requirements such as high vacuum and gas-induced arcing. At the same time Nano-scale catalysts should be stored under anaerobic conditions. These requirements for preparation and use limit the popularization and application of nano-scale metal catalysts.

Chinese patent CN101269331A prepares mesoporous Cu-Zn-Al catalyst by adding an organic active agent in the process of co-precipitation. This method increases the catalyst activity by increasing the pore size and surface area. Thin, poor thermal stability, easy to collapse during use, etc., which limit its application. Unfortunately, the patent does not disclose the thermal stability data of the mesoporous Cu-Zn-Al catalyst

However, potassium sodium modified Cu / SiO 2 Because the catalyst is too strong in potassium and sodium alkalinity, it also has the disadvantage of low stability in application