45results about How to "Improve propylene yield" patented technology

Methods and compositions for reactions of hydrogen over a Re-containing catalyst with compositions containing a 5-carbon sugar, sugar alcohol, or lactic acid are described. It has been surprisingly discovered that reaction with hydrogen over a Re-containing multimetallic catalyst resulted in superior conversion and selectivity to desired products such as propylene glycol. A process for the synthesis of PG from lactate or lactic acid is also described.

A process for the production of propylene from an olefinic feedstock containing at least one olefin of C₄ or greater, the process comprising contacting the olefinic feedstock with a catalyst of the MFI-type having a silicon/aluminum atomic ratio of at least about 180 to produce an effluent containing propylene, the propylene yield on an olefin basis being from 30 to 50k based on the olefinic content of the feedstock.

A process for conversion of a hydrocarbon feedstock comprising a relatively heavy main feedstock with a boiling point above approximately 350° C., and a relatively light secondary feedstock with a boiling point below approximately 320° C., wherein, the main feedstock, representing at least 50 wt. % of the hydrocarbon feedstock, is cracked in a fluidized-bed reactor in the presence of a cracking catalyst, the secondary feedstock is cracked in a fluidized bed with the same cracking catalyst, separately or mixed with the main feedstock, said secondary feedstock comprising oligomers with at least 8 carbon atoms of light olefins with 4 and/or 5 carbon atoms.

For the production of hydrocarbons, in particular C₂-C₄ olefins, using a combined plant with a steam cracker and at least one reactor for converting an educt mixture which includes steam and at least one oxygenate, the respective intermediate product streams of the steam cracker and of the reactor are at least partly combined. To increase the yield of valuable products, a shape-selective zeolite material is used as catalyst in the reactor for oxygenate conversion and at least a part of the product streams obtained downstream of the combined plant is recirculated to the steam cracker and/or the reactor.

A catalytic conversion process can convert inferior feedstock to high quality fuel oil and propylene. A inferior feedstock is introduced into first and second reactor zone, wherein the feedstock carry out first step and second step reactions by contacting with catalytic conversion catalyst. Product vapors separate from spent catalyst by gas-solid separation. The spent catalyst is stripped, regenerated by burning off coke and then returns to reactor. The product vapors are introduced into separation system to obtain propylene, gasoline, diesel, fluid catalytic cracking gas oil (FGO) and other products. The FGO is introduced into hydrotreating unit and/or extraction unit to obtain hydrotreated FGO and/or extracted FGO. Said hyrotreated FGO and/or extracted FGO return to the first reactor zone and/or another catalytic cracking unit to obtain propylene and gasoline. The extracted oil of said FGO is rich in double ring aromatics which are good chemical materials. The raffinate of said FGO is rich in chain alkane and cycloalkane which are suitable for catalytic cracking. More particularly, the invention relates to a process to utilize petroleum oil resources efficiently for decreasing the yield of dry gas and coke significantly.

A process for obtaining a catalyst composite comprising the following steps:

a). selecting a molecular sieve having pores of 10-or more-membered rings

b). contacting the molecular sieve with a metal silicate different from said molecular sieve comprising at least one alkaline earth metal and one or more of the following metals: Ga, Al, Ce, In, Cs, Sc, Sn, Li, Zn, Co, Mo, Mn, Ni, Fe, Cu, Cr, Ti and V, such that the composite comprises at least 0.1 wt % of silicate.

The invention relates to an MTP (methanol to propylene) method, which mainly solves the problems that the reaction condition of the existing MTP multi-section fixed bed technology cannot be easily controlled, the propylene yield is unstable, and the content of oxygen-containing compounds in the product cannot be ensured. According to the method, raw materials containing methanol are adopted as feeding and chilling materials, the feeding materials enter a reactor from the top of the multi-section fixed bed reactor to be in contact with catalysts filled in the reactor, and material flows containing propylene are generated through reaction, wherein chilling material distributors and inner heat taking devices are arranged between all catalyst bed layers and sections of the multi-section fixed bed reactor, and the chilling material flows enter positions among all catalyst bed layers and sections through the chilling material distributor. Through the technical scheme, the problems are perfectly solved, and the MTP method can be applied into the industrial production of the MTP.

The present invention discloses catalytic cracking apparatus and process, which are useful for catalytic cracking of heavy oils with a high heavy oil conversion, a high propylene yield and low dry gas and coke yields.

A combination of moving bed regeneration technology and CO oxidation technology is used in a novel moving bed regeneration apparatus containing an integral CO oxidation zone to solve the problem of regenerating a coke-containing catalyst that does not contain a CO oxidation promoter without generating an effluent flue gas stream containing hazardous and undesired amounts of CO. The CO oxidation zone is located in the flue gas collection zone within the moving bed regeneration apparatus and functions autogenously to eliminate the CO hazard by oxidizing CO to CO₂ with a portion of the unreacted oxygen withdrawn from the coke combustion zone of the moving bed regeneration apparatus.

A process for increasing the yield of C₃ olefin in fluidized bed catalytic cracking of hydrocarbon feedstocks is disclosed. C₄ fraction produced from the cracking of hydrocarbon feedstock in the primary reaction zone (riser), optionally with external source of C₄ stream is fed into the stripper which acts as a secondary reaction zone at an elevated temperature and at an optimum WHSV. The elevated temperature is achieved by injecting a part of the regenerated catalyst from regenerator, which is at a higher temperature, directly into the stripper through a dedicated additional lift line. This raises the activity of catalyst inside the stripper. The direct injection of regenerated catalyst into the stripper, besides producing higher yields of propylene, improves the stripping efficiency leading to enhanced recovery of strippable hydrocarbons.

The invention provides a highly dispersed ZnO-based catalyst as well as a preparation method and a propane anaerobic dehydrogenation method thereof. The preparation method of the catalyst comprises the following steps: dispersing Silicalite-1 into a solvent so as to obtain a suspension I; putting a zinc source into the suspension I, and stirring so as to obtain a suspension II; putting 2-methylimidazole into the suspension II, and stirring so as to obtain a ZIF-8/Silicalite-1 compound; and centrifuging the ZIF-8/Silicalite-1 compound, washing, drying, and carrying out pyrolysis in a nitrogen atmosphere, thereby obtaining a ZnO@/NC/Silialite-1 catalyst, namely the highly dispersed ZnO-based catalyst. Due to acid pickling, the stability of the catalyst can be also improved. The invention further provides a catalyst prepared by using the method and a propane anaerobic dehydrogenation method using the catalyst. The catalyst provided by the invention has no harsh requirement on a propane anaerobic dehydrogenation process, is capable of achieving efficient conversion of propane, and meanwhile has high catalyst stability.

The invention provides a system and a method of preparing propylene tail oil by value-added exploitation of methanol. The comprises a first reactor, a second reactor, a product separation unit, a c 4 hydrocarbon extraction, rectification and separation device and a heating furnace, wherein the first reactor performs dimethyl ether preparation reaction with methanol to form a first product flow; the second reactor synthesizes propylene by using a material from the heating furnace as a raw material to form a second product flow; the product separation unit receives and separates the second product flow to form propylene, c 4 hydrocarbon, a c 5/c 6 hydrocarbon mixture and ethylene; the c 4 hydrocarbon extraction, rectification and separation device separates at least part of c 4 hydrocarbon to form a butylene product flow; and the heating furnace receives and heats at least part of first product flow, at least part of butylene product flow, at least part of c 5/c 6 hydrocarbon mixture and at least part of ethylene. The system and the method can reprocess butylene alone, and supplement the removed butane part with the c 5/c 6 hydrocarbon mixture; the reprocessing quantity of the tail oil is increased; the yield of propylene is increased; the value-added exploitation of the tail oil is achieved; and economic benefits are raised.

The present invention provides a process for preparing ethylene and propylene, comprising the step of:

• • a) contacting a feed comprising methanol, ethanol and C4+ olefins with a catalyst, comprising ZSM-5 having a silica to alumina ratio in the range of from 40 to 100, at a temperature in the range of from 350 to 1000° C. to obtain a olefinic product comprising ethylene and propylene.

The invention discloses a method for preparing propylene from methanol. The method comprises the step of utilizing a first reactor and a second reactor to carry out reaction for preparing propylene from methanol, wherein the first reactor is used for carrying out reaction for synthesizing dimethyl ether with methanol so as to obtain a first product flow; the second reactor is used for carrying out reaction for preparing propylene with the first product flow so as to obtain a second product flow; a plurality of catalyst bed layers are longitudinally arranged in the second reactor and are filled with first catalysts and second catalysts; the second product flow is separated to obtain circulating hydrocarbon product flows containing C2, C4, C5 and C6; and the circulating hydrocarbon product flows are sent into the second reactor again. By adopting the method, by filling two kinds of catalysts with different acidity in the reactors, the circulating hydrocarbon is partially subjected to catalytic pyrolysis on the catalyst bed layer with stronger acidity, meanwhile, secondary reactions undergone by olefin molecules, such as hydrogen transfer, aromatization and the like to generate alkane and macromolecular aromatic hydrocarbon are reduced and the yield of propylene is increased.

Provided is a process for manufacturing a Fluid Catalytic Cracking catalyst additive composition with a novel binder. The steps involve mixing an alumina source with water to make a slurry; adding to the alumina slurry an amount of P2O5 source; the slurry is then stirred and reacted under controlled temperature and time conditions to form an aluminum phosphate binder; adding to the aluminum phosphate binder a zeolite, an amount of silica binder and an amount of clay; and spray-drying the slurry to form catalyst additive particles. The catalyst additive composition comprises a about 35 wt % to about 65 wt % zeolite; about 0 wt % to about 10 wt % silica; about 15 wt % to about 50 wt % clay and an aluminum phosphate binder comprising about 2.5 wt % to 5 wt % amorphous or pseudo-boehmite alumina and about 7 wt % to 15 wt % phosphoric acid.

The invention provides a refining method of mixed liquefied petroleum gas. The refining method comprises the following steps: feeding coked liquefied petroleum gas from a coking device into a riser reactor of a catalytic cracking device, and carrying out cracking reaction on the coked liquefied petroleum gas and a catalytic cracking fed material together; then distilling off mixed liquefied petroleum gas mixed with catalyzed liquefied petroleum gas from a fractionation system in the catalytic cracking device; and feeding the mixed liquefied petroleum gas into a hydrogen sulfide extraction device and a mercaptan extraction device to desorb hydrogen sulfide and mercaptan respectively. The sulfur content of the desulfurized liquefied petroleum gas product is not greater than 10 mu g/g. The refined mixed liquefied petroleum gas can be distilled to obtain a propylene product which meets the requirement of the sulfur content, and the propylene product can be used as a raw material for producing low-sulfur MTBE.

The invention belongs to the technical field of catalytic cracking catalysts and discloses a catalytic cracking catalyst for producing propylene as well as a preparation method and an application method of the catalytic cracking catalyst. The catalyst comprises natural minerals, zirconium-aluminum composite sol, other inorganic oxide binders, a Y-type molecular sieve and an MFI structure molecularsieve. The preparation method of the catalyst comprises the following steps: mixing and pulping the MFI structure molecular sieve, the Y-type molecular sieve, the natural minerals, the zirconium-aluminum sol and other inorganic oxide binders, and carrying out spray drying. The catalyst has good strength and high activity, is used for catalytic cracking of hydrocarbon oil, and has high raw material conversion rate and high propylene yield.

The invention provides a catalytic cracking prolific propylene catalyst and a preparation method thereof. The preparation method comprises the following steps: a) sequentially carrying out phosphorus modification and metal modification on a hydrogen type ZSM-5 molecular sieve to obtain a modified molecular sieve; b) mixing a binder with water to obtain precursor slurry, and sequentially adding kaolin, pseudo-boehmite, hydrochloric acid and the modified molecular sieve obtained in the step a) under a stirring condition to obtain propylene catalyst mother liquor; and c) molding the propylene catalyst mother liquor obtained in the step b), and roasting to obtain the catalytic cracking productive propylene catalyst. Compared with the prior art, the preparation method provided by the invention has the advantages that the hydrogen type ZSM-5 molecular sieve is adopted as the raw material, modification treatment is carried out in cooperation with specific steps, the overall better interaction is realized, and the prepared catalytic cracking prolific propylene catalyst has higher propylene yield and propylene selectivity, and is good in hydrothermal stability; the catalyst can be better used in the field of petrochemical catalytic cracking.