55results about How to "Low conversion rate" patented technology

The invention relates to a synthesis method of hydroquinone. The method is characterized by comprising the following steps: carrying out catalytic oxidation on phenol and oxygen to generate a mixture of p-benzoquinone and o-benzoquinone, wherein a catalyst is copper and sodium complex salt; distilling to remove solvent, adding water in residual materials, and separating p-benzoquinone and o-benzoquinone by distillation; reducing separated p-benzoquinone with a reducing agent to obtain hydroquinone, filtering out hydroquinone crude product and recrystallizing so as to obtain hydroquinone crystal; and concentrating a mother liquid obtained by filtering out hydroquinone or catechol crude product to obtain an ammonium sulfate fertilizer. The synthesis method has simple process, mild reaction conditions and short reaction period, and the yield of hydroquinone in the product is larger than that of catechol.

A catalyst for manufacturing synthesis gas has a carrier and a Group VIII metal carried by the carrier. The carrier contains a first ingredient, a second ingredient and a third ingredient. The first ingredient is an oxide of at least an alkaline earth metal selected from the group of magnesium, calcium, strontium and barium. The second ingredient is an oxide of at least an element selected from the group of scandium, yttrium and lanthanoids. The third ingredient is zirconia or a substance containing zirconia as principal ingredient and has a solid electrolytic property. The carrier may be formed by forming an overcoat film on a substrate by coating. Then, the overcoat film contains the above three ingredients. A catalyst according to the invention can remarkably reduce the dimensions of the reaction facility and improve the energy efficiency of the facility.

A shrimp aquaculture system includes the steps of: (1) preparing a water container; (2) exposing the water container under the sunlight, and then filling with predetermined amount of water; (3) adding 50 liter of liquid-fermentation feed into the water container at least 1 to 2 times per day; (4) adding 50 kilogram of beneficial agents into the water container once per day to obtain nursing water; (5) adding larva and young shrimp into the nursing water, and further adding a solid-fermentation feed into the nursing water, at least once a day, lasting for 0.5 to 3 months beginning on the date of adding young and larva shrimp; (6) three months later, adding regular shrimp feed containing beneficial agents into the water container; and (7) adding the amount of 1 to 3 ppm of photosynthetic bacteria into the nursing water of the water container once a day.

A process for hydrogenating carbon dioxide to generate methanol. In the process, a strip of copper base plate is transported by the groups of rotating drive rollers to deposit porous metallic zinc on the copper base plate. Hydrogen is generated from the porous metallic zinc upon electrochemical reactions in the inner space sealed with the above groups of rollers. Simultaneously, zinc oxide and copper oxide catalysts are formed on the porous metallic zinc. Carbon dioxide is introduced into the sealed inner space under high-temperature and high-pressure to generate methanol by hydrogenation.

The invention discloses a co-firing method of full-body ink-jet black golden flower full-polished bricks and common archaized bricks. It is required by co-firing process that the brick types of the full-body ink-jet black golden flower full-polished bricks and the common archaized bricks are within the national standard range; generally case, the brick type of the common archaized bricks is easy to tilt; the invention relates to a full-body ink-jet black golden flower full-polished brick, in particular to a full-body ink-jet black golden flower full-polished brick with a deep-color layout. Toavoid such circumstances, full-body ink-jet black golden flower full-polished brick surface glaze and common archaized brick surface glaze with different expansion coefficients are selected to realizebasic consistency of the shapes of the bricks discharged out of a kiln; the method comprises the following steps: adjusting the expansion coefficient of surface glaze for the full-body ink-jet blackgolden flower full-polished bricks to 250 * 10 <-7 > m / K-300 * 10 <-7 > m / K; adjusting the expansion coefficient of the surface glaze used by the common archaized bricks to 190 * 10 <-7 > m / K-230 * 10<-7 > m / K; the brick shape of the full-body ink-jet black golden flower full-polished bricks is close to that of common archaized bricks, the product percent of pass of co-firing of the full-body ink-jet black golden flower full-polished bricks and the common archaized bricks is greatly increased, the product quality is stable, the transfer rate is low, and meanwhile the productivity is improved.

A heat-resistant aluminum hydroxide which is prepared by subjecting a mixture of aluminum hydroxide with a reaction retardant for retarding the conversion aluminum hydroxide to boehmite, as a raw material, to the hydrothermal treatment or to pressurization and heating in a steam atmosphere; and a method for preparing a heat-resistant aluminum hydroxide which comprises subjecting a mixture of aluminum hydroxide with a reaction retardant for retarding the conversion aluminum hydroxide to boehmite as a raw material to the hydrothermal treatment, or to pressurization and heating in a steam atmosphere.

A carboxylic acid is produced by oxidative cleavage of a cycloalkane with oxygen and performs a reaction in the presence of a catalyst including an imide compound and a metallic compound, the imide compound having a cyclic imide skeleton represented by the following Formula (I): wherein X is an oxygen atom or an —OR group, and wherein R is a hydrogen atom or a hydroxyl-protecting group, under conditions of a reaction temperature of 80° C. or higher and a concentration of the cycloalkane of 21% by weight or more.

Disclosed are a fluidized bed gas distributor and a fluidized bed reactor, the fluidized bed reactor comprising a first distributor (1) and a second distributor (2), wherein the first distributor (1) is located at the bottom of a fluidized bed, and second distributor (2) is located downstream of a gas from the first distributor (1). Also disclosed is a method for producing a para-xylene and co-producing light olefins, the method comprising the following steps: material stream A enters a reaction zone (3) of a fluidized bed reactor from a first gas distributor (1); material stream B enters the reaction zone (3) of the fluidized bed reactor from a second gas distributor (2); and the reactants are brought into contact with a catalyst in the reaction zone (3) to generate a gas phase stream comprising para-xylene and light olefins.