3results about How to "Improve conversion" patented technology

This invention belongs to the field of organic compound production technology, specifically relating to a method for preparing 1,1,3,3-tetramethylbutyl peroxide, comprising the following steps: S1, adding 2,4,4-trimethyl-2-pentanol to cooled sulfuric acid, then adding an aqueous solution of hydrogen peroxide and stirring to initiate a preliminary reaction, followed by adding a modified resin catalyst to continue the reaction, separating the organic phase after the reaction, washing and drying the organic phase to obtain 1,1,3,3-tetramethylbutyl hydrogen peroxide; S2, under stirring conditions, adding an alkaline solution dropwise to the 1,1,3,3-tetramethylbutyl hydrogen peroxide to initiate a reaction, followed by adding trimethylacetyl chloride to initiate an acylation reaction, continuing the acylation reaction after the addition is complete, separating the organic phase after the reaction, washing the organic phase to obtain 1,1,3,3-tetramethylbutyl peroxide. This invention employs a one-pot method for preparation and uses a modified resin catalyst, thereby improving the conversion rate.

The invention relates to a shape control method for a casing forge piece for a large gas turbine. The shape control method comprises the following steps that S1, blanking is conducted; step S2, chamfering is carried out; s3, upsetting and punching are carried out; s4, cooling after forging; s5, primary annealing is conducted, and heat preservation is conducted on the forged piece at the temperature of 690 + / -40 DEG C; s6, trestle chambering is conducted, and the forging temperature ranges from 900 DEG C to 1150 DEG C; s7, secondary annealing is conducted, specifically, the forged piece is annealed and subjected to heat preservation, and the annealing temperature is 690 DEG C + / -40 DEG C; step S8, normalizing: normalizing the forge piece and preserving heat at the normalizing temperature of 1130 + / -5 DEG C; s9, primary tempering is conducted, specifically, the forge piece is tempered and subjected to heat preservation, and the tempering temperature is 760 + / -5 DEG C; s10, quenching is conducted, specifically, the forge piece is quenched, and the quenching temperature is 1120 + / -5 DEG C; s11, secondary tempering is conducted, specifically, the forge piece is tempered, and the tempering temperature is 680 + / -5 DEG C; and S12, stress relief annealing is conducted, and the stress relief annealing temperature is 630 + / -5 DEG C. The method has the advantages that the performance stability is improved, and the cracking phenomenon of the product caused by stress concentration is avoided to the maximum extent.

The invention discloses a hydrophobic modified silicon dioxide loaded noble metal catalyst as well as preparation and application thereof. The preparation method of the hydrophobic modified silicon dioxide loaded noble metal catalyst comprises the following steps: (1) obtaining a SiO2 carrier with the hydroxyl content of 0.7-1.0 mmol / g; (2) obtaining an agglomeration-free hydrophobic modified SiO2 carrier; and (3) high-dispersion loading of the Pd active component. The invention provides application of the hydrophobic modified silicon dioxide loaded noble metal catalyst in hydrogen room-temperature oxidation reaction, and before hydrogen room-temperature oxidation reaction, the hydrophobic modified silicon dioxide loaded noble metal catalyst is subjected to reduction pretreatment in a hydrogen-containing atmosphere. The prepared catalyst has an excellent effect in hydrogen room-temperature oxidation reaction evaluation, is sensitive to hydrogen response under the conditions of high space velocity, low hydrogen concentration and high humidity, is high in hydrogen conversion degree, obviously inhibits an inactivation phenomenon, and has excellent stability.