Preparation method for solid acid catalyst r-AI203

Abstract

The invention provides a preparation method for catalyst r-AI203 in the productive process of methyl alcohol, which sequentially comprises the following steps that: under the temperature condition of 500 DEG C to 550 DEC temperature condition, a reacting furnace is used for roasting r-AI203 carrier for 4-5 hours; nickel acetate, ammonium molybdate and hexamine is dissolved in ammonia water with 30% of percentage concentration to prepare clear impregnating liquid, is stirred and soaked in the room temperature for 2-4 hours, filtered and dried, dried in the vacuum for 5-8 hours in the temperature of 60 DEG C-100 DEG C, compressed and mould by a tablet machine, sieved and filtered; and then the r-AI203 carrier is baked in a reacting furnace which is risen to 450 DEG C to 550 DEG C; the baked r-AI203 is for four hours to obtain a catalyst in the nitrogen containing 1% of oxygen according to the volume percent, wherein the mass percents of the nickel and the molybdenum in the active components are respectively 25-10% and 6-25%; and the nickel and the molybdenum exist in the coexisting form of the Ni2M03N and less oxides. The catalyst prepared by the method is characterized by long service life and good activity and heat stability; the dehydration reaction selectivity is above 99%; the catalyst can increase the conversion rate of dimethyl ether to methanol and the purity of the methanol, well solves the problem that in the process of producing methanol production with sulphate process, the device is corroded and the residual liquid is seriously polluted.

Description

technical field [0001] The invention relates to a chemical catalyst, especially a method for preparing the catalyst used in the methanol production process. Background technique [0002] Methanol is a very important industrial raw material. At present, DME is mainly produced through a series of chemical reactions, and then converted into methanol. The production methods of dimethyl ether mainly include sulfuric acid method, methanol gas-phase catalytic dehydration method, and synthesis gas one-step method to directly synthesize dimethyl ether. Although the sulfuric acid method has mild reaction conditions and high conversion rate of methanol per pass, generally above 85%, the production can be either intermittent or continuous, but the equipment is severely corroded during the production process, and the residual liquid and waste water are very serious to the environment. Operating conditions Harsh, the produced methanol is difficult to remove trace impurities, so it has p...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of catalyst r-AL that is used for methanol production process 2 o 3 The preparation method, the use of this catalyst in the production process using the sulfuric acid method can better solve the problem of serious corrosion of equipment and reduce the pollution of residual liquid