An electric pump unit for a transmission, which supplies a hydraulic pressure to the transmission, includes: a pump which takes in and discharges oil; and a pump driving electric motor including a motor shaft connected to the pump, a motor rotor fixedly provided on the motor shaft, and a motor stator disposed around a circumference of the motor rotor. The pump and the electric motor are integrated with a lid that tightly closes an opening in a recess portion which is formed on a transmission housing of the transmission and into which the oil is introduced, and are accommodated within the recess portion.

Electric pump unit

A novel process for cracking olefins including contacting a hydrocarbon oil with a catalyst in a riser reactor having multiple reaction zones under cracking reaction conditions; separating reaction products and the catalyst; regenerating at least a part of spent catalyst obtained, contacting a part of the regenerated catalyst with the hydrocarbon in the first reaction zone; contacting the other part of the spent catalyst and/or regenerated catalyst in at least one reaction zone after the first reaction zone with the products obtained in previous reaction zones.

Process for cracking hydrocarbon oils

A muffler for a compressor, which has a chamber between an inlet (112) and an outlet (116) and also appropriately designs a size of a communicating pipe (120) for indirectly connecting the inlet (112) to the outlet (116) as well as a size of a noise space, whereby a suction loss of a refrigerant sucked into the muffler for the compressor can be reduced and also pressure pulsation can be reduced so as to enhance a cooling capability of the compressor and a noise reduction effect. Also, an assembling structure of the muffler can be simplified, resulting in reduction of fabricating cost and improvement of productivity.

Muffler for compressor

The invention discloses a preparation method of a hydrotreating catalyst. The preparation method comprises the following steps: (1) pulping dry alumina glue, adding organic salt, uniformly mixing the pulped dry alumina glue and the organic salt, performing solid-liquid separation and drying on the mixture so as to obtain modified dry alumina glue powder; (2) pulping the modified dry alumina glue powder, adding the pulped modified dry alumina glue powder in a heteropoly phospho-molybdic acid (H2PMo12O40) solution, performing a reaction on the organic salt in the solution and heteropoly phospho-molybdic acid, and after reaction, performing solid-liquid separation, drying, extrusion molding and calcination on the mixture so as to obtain a catalyst precursor; (3) dipping the catalyst precursor in activated metal promoter, and drying and calcining the catalyst precursor so as to obtain a catalyst product. For the catalyst prepared by adopting the method disclosed by the invention, the active components are uniformly distributed in the catalyst, so that the catalyst is easy to vulcanize; the activated metal has high dispersity on the surface of the catalyst, so that the activity of the catalyst is improved, the use ratio of the activated metal is increased, and the service life of the catalyst is prolonged.

Preparation method of hydrotreating catalyst

The invention provides a catalytic cracking auxiliary agent and a preparation method thereof. The catalytic cracking auxiliary agent contains a mesoporous silica alumina material, an aluminum phosphorus auxiliary agent and clay and/or heat-resistant inorganic oxide, wherein the mesoporous silica alumina material is obtained by the following steps of mix-pulping the mesoporous silica alumina material without ion exchange with water to obtain a slurry liquid; and contacting the slurry liquid with an inorganic acid for at least 0.2 hour at a temperature ranging from room temperature to 100 DEG C, so as to make the sodium oxide content in the mesoporous silica alumina material no higher than 0.2 wt%, wherein the weight ratio of the mesoporous silica alumina material without ion exchange, water and the inorganic acid is 1 : 5-30 : 0.03-0.3. The catalytic cracking auxiliary agent has relatively strong heavy oil cracking ability, high light oil yield and good coke selectivity when being used for the catalytic cracking of the heavy oil.

Catalytic cracking auxiliary agent and preparation method thereof

A sulfur transfer catalyst contains the composition containing Mg-Al spinel (70-98 wt.%) and the oxide of Ce and/or V (2-30 wt.%). Said composition contains magnesium oxide (25-30 wt.%), alumina (60-70 wt.%) and the oxide of rare-earth metal except Ce (5-15 wt.%). Its advantages are high reduction regeneration power.

Sulfur transfer catalyst and its preparing process

A composition containing Mg-Al spinel contains magnesium oxide (25-30 wt.%), alumina (60-70 wt.%) and the oxide of rare-earth metal except Ce (5-15 wt.%). Its Mg and Al constitute spinel structure. The content of free magnesium oxide is lower than 5 wt.%. It can be used as the matrix of sulfur transfer catalyst which has better reduction regeneration performance.

Composition containing Mg-Al spinel and its preparing process

The present invention relates to a phosphorus and aluminum containing sol for petroleum hydrocarbon cracking catalyst and its features are containing Al 2-10 wt%, P 5-20 wt% and no Cl, with its P/Al ratio being 12-6 and pH value being 10-25 The preparation process includes beating aluminium hydroxide or alumina capable of being peptized and deionized water to obtain a slurry with solid content of 15-35 wt%, adding concentrated phosphoric acid according to the required P/Al ratio while stirring, heating to 65-95 deg and reaction for 15-90 min until becoming transparent colloid The said phosphorus and aluminum containing sol without C1 may be used together with conventional chlorine-containing aluminum sol

Phosphorus-containing aluminium sol adhesive for catalyst and its prepn

The hydrocarbon cracking catalyst contains molecular sieve, binder and clay and its features are the mixed sol of chlorine-containing aluminum sol and phosphorus-containing aluminium sol used as binder. The binder raises the antiwear strength of the catalyst, and decreases the chlorine content in the spray drying slurry and the catalyst. The hydrocarbon cracking catalyst results in lower gas and coke yield and higher diesel oil yield and diesel oil/gasoline ratio.

Zheng Manying

Papers

Sulfur transfer catalyst and its preparing process

Composition containing Mg-Al spinel and its preparing process

Phosphorus-containing aluminium sol adhesive for catalyst and its prepn

Hydrocarbon cracking catalyst containing phosphorus and its prepn