40results about How to "Not easy to cause corrosion" patented technology

The invention discloses a method for preparing 5-hydroxymethylfurfural by hydrothermally decomposing wood fibers, which comprises the following steps: drying and pulverizing wood fibers to 40-120 meshes, soaking with water, treating with an ultrasonic apparatus for 5-20 minutes, mixing with a catalyst and a solvent, and stirring to carry out hydrolysis reaction at 170-250 DEG C for 30-150 minutes; after the reaction finishes, cooling and filtering; extracting the water phase with an organic solvent, merging the extraction liquid and the organic phase, and removing the solvent to obtain the 5-hydroxymethylfurfural. The invention has the advantages of cheap and accessible raw material and abundant sources, can solve the problem of raw material sources of 5-hydroxymethylfurfural, relieves the environmental pollution from stacked waste wood fibers, and enhances the wood fiber hydrolysis efficiency by using ultrasonic processing.

The invention discloses a multi-layer chemical engineering glass trough. The multi-layer chemical engineering glass trough comprises an embedded trough body, a top cover and a base. The embedded trough body is mounted on the base. The top cover is mounted on the embedded trough body. The embedded trough body comprises a first glass baffle, a third glass baffle, a hollow groove, a second glass baffle and fixing bolts. The first glass baffle is mounted on one side of the embedded trough body. The second glass baffle is mounted on the right side of the first glass baffle. The hollow groove is connected with the second glass baffle. The third glass baffle is connected with the hollow groove. The fixing bolts are mounted on the third glass baffle and connected with the hollow groove. The base comprises fixing rods, bolts and supporting blocks. The multi-layer chemical engineering glass trough is made of multiple layers of glass, so that chemical materials are effectively prevented from being leaked, corrosion and rusting are not prone to occurring, the materials are stored intactly and not prone to being mixed with impurities, and the multi-layer chemical engineering glass trough is convenient to use and long in service life.

In a two-phase system of an organic phase and an aqueous phase, an inorganic neutral halogen salt serves as a catalyst, so that high-efficiency conversion from primary biomass to 5-hydroxymethylfurfural (HMF) and furfural can be realized. An aqueous solution containing the inorganic neutral halogen salt can be recycled after the reaction is ended; the upper organic phase is subjected to alkali treatment, so that a relatively pure organic solution containing the 5-hydroxymethylfurfural (HMF) and furfural and xylogen residues can be obtained; the obtained xylogen residues are further hydrogenated under the action of a noble metal or transition metal multifunctional catalyst so as to obtain the liquid naphthenes. The method disclosed by the invention has the advantages that usage of an acid catalyst is not involved in the dehydration reaction process, and the produced 5-hydroxymethylfurfural and furfural can be efficiently extracted into the upper organic phase after the reaction is ended; after the organic phase is washed with alkali liquor, the xylogen residues are obtained by acid neutralization, the liquid naphthenes are prepared by one-step hydrogenation, and the method is simple in operation, realizes total conversion of the primary biomass and has excellent industrial application prospects.