Preparation method of phosphorus vanadium catalyst for using acetic acid and formaldehyde to synthesize crylic acid

Abstract

The invention discloses a preparation method of a phosphorus vanadium catalyst for using acetic acid and formaldehyde to synthesize crylic acid, comprising the following steps of: taking vanadium pentoxide, solid orthophosphoric acid and isobutanol as main materials, firstly mixing the isobutanol and the vanadium pentoxide, then using the isobutanol to dissolve the solid orthophosphoric acid completely, adding a certain amount of aluminium oxide while mixing the mixture, finally carrying out vacuum filtration and drying on reactants to obtain a phosphorus vanadium catalyst precursor, before use, rising the temperature to 380 DEG C at the activation temperature rising rate of 3 DEG C / min, introducing air to activate for two hours, and obtaining a novel phosphorus vanadium catalyst. The phosphorus vanadium catalyst is used as a catalyst in synthesizing the crylic acid by taking the acetic acid and the formaldehyde as materials; and in the reaction temperature interval of 320-380 DEG C, and under the optimum reaction condition, the single-pass yield of the crylic acid can be up to 93.5mol%, and the catalytic performance of the catalyst is obviously higher than that of the similar catalyst in synthesizing the crylic acid by taking the acetic acid and the formaldehyde as materials reported at present.

Description

technical field [0001] The invention relates to a preparation process of a phosphorus vanadium catalyst, in particular to a preparation method of a phosphorus vanadium catalyst for synthesizing acrylic acid with acetic acid and formaldehyde as raw materials. Background technique [0002] Acrylic acid (Acrylic Acid, AA) is an important organic chemical raw material, most of which are used to produce acrylates (such as methyl acrylate, ethyl, butyl and octyl, etc.), and a small amount is used to produce super absorbent resins and detergent builders and water treatment agents, etc. Acrylic acid and its ester series products can be widely used in coatings, chemical fibers, textiles, leather, plastics, and adhesives due to their excellent physical and chemical properties, especially their unique multi-functions such as miscibility, copolymerization, and esterification. , oil exploration and oil additives and other fields. [0003] Acrylic acid was industrialized in the 1930s, a...

AI Technical Summary

Problems solved by technology

The vanadium phosphate catalyst needs to be fed with hydrogen chloride gas during the preparation process, and hydrogen chloride gas is very irritating to the human body, so if an accident occurs, it will seriously affect the health of the staff; on the other hand, special hydrogen chloride gas needs to be used to generate hydrogen chloride gas The increase of generating devices and additional devices greatly increases the production cost; in addition, the preparation process of the vanadium phosphate catalyst is complicated, and the requirements for the preparation device are also high, such as requiring the preparation device to have good sealing and corrosion resistance, etc.