36results about How to "Avoid deep oxidation" patented technology

The invention relates to a method for producing ethylene and ethane and a catalytic reactor, belonging to the technical field of lower hydrocarbon. The method comprises the following steps of: carrying out first methane catalytic conversion reaction on a methane-rich feed gas and an oxidizing gas by using a first section of granular catalytic agent, carrying out second methane catalytic conversion reaction on the gas mixture entering a second integrated type catalytic agent reaction section after supplementing the oxidizing gas in a reaction gas mixture, and finally collecting a reaction product. A premixing chamber which is provided with a feed gas inlet and an oxidizing gas inlet is arranged at the top of the catalytic reactor; a first reactor in which a granular catalytic agent is placed is communicated with the lower end of the premixing chamber; an oxidizing gas replenisher is communicated with the first reactor; a second reactor in which an integral catalytic agent is placed is communicated with the oxidizing gas replenisher; and a product outlet is arranged at the lower end of the second reactor. The catalytic reactor has the advantages that the single-pass methane conversion rate of the methane catalytic conversion reaction is increased, the technological process is short, the operation is stable, and the equipment investment is few.

The invention belongs to a reaction device with short gas-solid contact time and its application. The reaction device includes a riser reactor, a settling reactor, a gas-solid separator and a feeding device; the riser reactor is installed in the settling At the bottom of the reactor, the discharge port of the riser reactor is higher than the bottom discharge port of the settling reactor; the gas-solid separator is used for the separation of product gas and catalyst particles; the return device collects the bottom discharge port of the settling reactor The transported catalyst particles and the catalyst particles obtained by the gas-solid separator are returned to the bottom of the riser; the bottom of the riser is provided with a feed gas inlet pipe. The present invention realizes short-term contact between the catalyst particles and the gas through the riser reactor, avoiding the deep oxidation of target products such as ethylene, and at the same time, the catalyst particles carry the reaction heat and perform heat exchange outside the reactor, so that the temperature of the hot spot in the reactor is reduced , which is conducive to improving the selectivity of the target product.

The invention relates to a multi-level porous catalyst, which is composed of active components accounting for 30% to 60% of the total mass and the balance being SiO with three-dimensional ordered multi-level channels. 2 Carrier is made; In parts by weight, the active component consists of 17.66g / 35.32g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 0.25g NH 4 VO 3 , 0.42g Cu(CH 3 C00) 2 2H 2 O, 0.48g SbCl 3 , 0.30g H 3 AsO 4 , 1.09g H 3 PO 4 , 0.35g La(CH 3 COO) 3 1.5H 2 O, 0.45g Ce(NO 3 ) 3 ·6H 2 O and 2.12g CsOH·H 2 O composition. At the same time, the invention also discloses the preparation method and application of the catalyst. The present invention can significantly improve the catalytic activity of the reaction, and it can be used to catalyze the oxidative dehydrogenation of isobutyraldehyde to prepare methacrylic acid, which can be carried out under normal pressure conditions with air as the oxidizing agent, and can obtain higher formazan under lower reaction temperature conditions. Acrylic acid yield and lower CO X generation rate.