Catalyst for preparing MEK (Methyl Ethyl Ketone) by carrying out dehydrogenation on 2-butanol and preparation method and application thereof

Abstract

The invention relates to a catalyst for preparing MEK (Methyl Ethyl Ketone) by carrying out dehydrogenation on 2-butanol, and preparation method and application of the catalyst. The catalyst is prepared by taking copper as a main activator, aluminum oxide as a carrier, B2O3 as an assistant and MO as a modifier; the catalyst is prepared from the following components in parts by weight: 5 to 35 parts of CuO, 3 to 15 parts of B2O3, 15 to 92 parts of Al2O3 and 0 to 35 parts of MO, wherein MO is one or more of CaO, MgO and NiO. According to the catalyst, and the preparation method and the application of the catalyst, disclosed by the invention, a tubular fixed bed reactor is adopted, hydrogen reduction is firstly carried out on the catalyst under the condition that the temperature 300 to 350 DEG C, and then a dehydrogenation reaction is carried out by feeding the 2-butanol and enabling the 2-butanol to be in contact with the catalyst, so that not only are the conversion rate of the 2-butanol and the selectivity of the MEK increased, but also the catalyst has high stability; the problems of low activity, easiness in sintering and instability of a copper-based catalyst are solved.

Description

technical field [0001] The invention belongs to the technical field of catalysts for preparing methyl ethyl ketone by dehydrogenation of sec-butanol, and in particular relates to a catalyst for preparing methyl ethyl ketone by dehydrogenation of sec-butanol and its preparation method and application. Background technique [0002] The catalysts used in the dehydrogenation of sec-butanol to prepare methyl ethyl ketone are mainly copper-based catalysts, such as: Cu / ZnO, Cu / Al 2 o 3 , Cu / ZrO 2 、Cu-ZnO / Al 2 o 3 , Cu / SiO 2 and Cu / Cr 2 o 3 Wait. However, due to its carrier Al 2 o 3 and SiO 2 The acidic site of the alcohol easily leads to the dehydration of the alcohol to form an alkene and the condensation of a ketone to form a high-carbon ketone, which reduces the reaction selectivity, although ZrO 2 At the same time, it has acidity, alkalinity and redox, and has obvious advantages as a copper-based catalyst carrier, but its comparative area is small and its thermal sta...

AI Technical Summary

Problems solved by technology

However, the specific surface area of ​​the catalyst is small, the mechanical strength is low, and it is prone to pulverization after long-term operation, which affects the service life of the catalyst

And the precipitating agent needs to be used in the preparation process, resulting in unenvironmentally friendly acid-base waste liquid

Chinese patent CN 103599786 A "Catalyst and its preparation method for the dehydrogenation of sec-butanol to methyl ethyl ketone" provides a Cu / SiO 2 Catalyst, using potassium sodium modified catalyst, although the conversion rate and selectivity of sec-butanol dehydrogenation to methyl ethyl ketone have been improved to a certain extent, but its active component content is relatively high, which increases the cost of catalyst preparation, and SiO 2 It is difficult to form as a carrier, and it is not easy for industrial application

In addition, the poor stability of copper-based catalysts due to high-temperature sintering has been difficult to meet the requirements of oxidation regeneration and long-term industrial operation.

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