41results about How to "Inhibition of secondary reactions" patented technology

A combined catalytic converting process for preparing low-carbon olefin with high output includes such steps as contacting between heavy oil as raw material, regenerated catalyst and carbon depositedcatalyst in flow-down tube reactor, cracking reaction, separating the cracked product from the catalyst to be regenerated, separating low-carbon olefin from cracked product, contacting between rest ofsaid product and regenerated catalyst in flow-up tube reactor, reaction, separating oil gas from catalyst, separating low-carbon olefin from oil gas, and regenerating the catalyst.

The invention discloses a preparation method of mesoporous ZSM-5 zeolite. The preparation method comprises the following steps: 1) allyl glycidyl ether and dimethyl diallyl ammonium are uniformly mixed, a sodium persulfate aqueous solution with mass concentration being 10-30% is added, the materials are uniformly stirred and heated to the temperature of 60-90 DEG C, and then a polymerization is carried out for 2-8 hours, and cooling is carried out to obtain a copolymer; 2) aluminum sulfate, concentrated sulfuric acid and deionized water are prepared to an uniform solution; 3) water glass, deionized water and the copolymer obtained in the step 1) are mixed, a mixture is continuously stirred for 0.5-3 hours, then the solution prepared in the step 2) is slowly added while rapid stirring, andthe materials are continuously stirred for 1-6 hours to obtain an uniform gel; and 4) the above gel is transferred to a high-pressure reaction vessel for crystallization, the crystallized products aresubjected to pumping filtration and washed to neutrality, and then the crystallized products are dried and roasted to obtain the mesoporous ZSM-5 zeolite. The prepared mesoporous ZSM-5 zeolite contains a lot of meso-structures, cost of raw material is low, operation is simple and easy, no special requirement is generated on equipment, and the method is suitable for industrial production and application.

The invention discloses a catalytic cracking method in the petrochemical industry. The method includes: the reaction is carried out in two stages, the first stage reaction is heavy oil catalytic cracking reaction carried out in the first tubular reactor, the first stage reaction is carried out after gas-solid separation, and the first stage reaction oil gas directly undergoes the second stage reaction, that is, enters the second tube Catalytic reforming reaction of gasoline with a reaction temperature of 430-460°C in a type reactor. The first-stage spent catalyst and the second-stage spent catalyst are stripped and then enter the regenerator for coke regeneration. Part of the regenerated catalyst in the regenerator is directly returned to the first tubular reactor to participate in the first-stage reaction; part of the regenerated catalyst enters the primary regenerated catalyst cooler for primary cooling, and then enters the secondary regenerated catalyst cooler for secondary cooling. After reaching 400-450°C, return to the second tubular reactor to participate in the second-stage reaction. The invention can be used for catalytic cracking of heavy oil and catalytic upgrading of gasoline.

The invention discloses a pyrolysis reactor and a method for treating rubbish with the pyrolysis reactor. The pyrolysis reactor comprises a pyrolysis oil gas outlet, heat accumulating type radiant tubes, oil gas guiding-out pipelines and a gas collecting tube. The heat accumulating type radiant tubes are arranged in multiple layers in the height direction of the pyrolysis reactor, and each layer includes multiple heat accumulating type radiant tubes which are parallel to one another in the horizontal direction. The oil gas guiding-out pipelines are arranged in multiple layers in the height direction of the pyrolysis reactor, each layer includes multiple oil gas guiding-out pipelines which are parallel to one another in the horizontal direction, and the surfaces of the oil gas guiding-out pipelines are provided with through holes. The gas collecting tube is communicated with the oil gas guiding-out pipelines and the pyrolysis oil gas outlet. The pyrolysis reactor can effectively restrain a secondary reaction of oil gas and increase the tar yield; in addition, the heat accumulating type heat-carrier-free radiant tube heating technology is adopted, no gas or solid heat carrier is needed, and the heat value of pyrolysis gas is increased; meanwhile, the pyrolysis reactor has the advantages that few devices are used, operation is easy, and the fault rate is low.

The invention provides a method for delaying coking. The method comprises the following steps: 1) high temperature materials from a radiant section of a heating furnace enter a tower from positions above a foam layer of a coke tower, and a coking reaction is carried out in the coke tower; 2) when the coking reaction is carried out, steam stripping is carried out to the generated coke by continuously blowing a proper amount of high temperature steam to a bottom part of the coke tower; 3) pressure of 0.10Mpa-0.6Mpa on a top part of the coke tower is maintained, oil gas generated by the reaction is discharged from the top part of the coke tower to a fractionating tower. After carrying out the coking reaction for 0.5hr-12hr, the coke which is fully steam stripped starts to be automatically and continuously let out by a coke-discharged valve at the bottom of the tower, and the coke is discharged to a coke gathering tank or being carried way by a transmission band. With the method provided in the invention, a green coke period which can delay coking is shortened, utilization efficiency of the coke tower is improved and investment and processing energy consumption are reduced. Simultaneously, a hot and cold period circulation of the coke tower is avoided to increase a service life of the coke tower.