36results about How to "High olefin content" patented technology

A membrane process for the removal of sulfur species from a naphtha feed, in particular, a FCC light cat naphtha, without a substantial loss of olefin yield is disclosed. The process involves contacting a naphtha feed stream with a membrane having sufficient flux and selectivity to separate a sulfur deficient retentate fraction from a sulfur enriched permeate fraction, preferably, under pervaporation conditions. Sulfur deficient retentate fractions are useful directly into the gasoline pool. Sulfur-enriched permeate fractions are rich in sulfur containing aromatic and nonaromatic hydrocarbons and are further treated with conventional sulfur removal technologies, e.g. hydrotreating, to reduce sulfur content. The process of the invention provides high quality naphtha products having a reduced sulfur content and a high content of olefin compounds.

The invention provides a method for hydrogenation of alkyne-rich tail gas of a butadiene extraction device. The alkyne-rich tail gas of a butadiene extraction device undergoes a liquid-phase hydrogenation reaction in the presence of an Ni-based catalyst using a titanium oxide-alumina compound as a carrier and undergoes a gas-phase hydrogenation reaction in the presence of an Ni-MO-based catalyst so that all alkynes and dialkenes in the raw material are subjected to hydrogenation conversion and most olefins are hydrogenated to form alkanes. The method realizes continuous and stable operation of the device and obviously reduces olefin content of the hydrogenation products to less than 5% so that requirements on cracking of the raw material of an ethylene production device are satisfied.

The invention discloses a synthesis method of an organic polysulfide used as a vulcanizing agent. In this method, the FCC distillate oil rich in olefins is used as a raw material. Under the action of a basic catalyst, the sulfur and the double bonds in the olefins undergo an addition reaction to form an adduct, and the unreacted elemental sulfur is separated by purification to obtain A mixture of relatively pure organic polysulfides. The organic polysulfide is mainly used as a vulcanizing agent for pre-sulfurization outside the hydrogenation catalyst. Its raw material has a wide range of sources and low cost, which can solve the problem of high production cost of the current organic vulcanizing agent; due to the use of mixed olefins as raw materials, the vulcanizing agent During application, the problem of excessively concentrated heat release can be alleviated; the process also has the advantages of simple preparation method and high sulfur content in the product, and has broad application prospects in the presulfurization process outside the hydrogenation catalyst.

The invention discloses a method for separating a liquid olefin and alkane mixture by adopting a functional ionic liquid. In the method, high-purity olefin is separated efficiently from an olefin and alkane mixture with a fractional extraction method by taking a liquid olefin and alkane mixture as a raw material liquid, taking an ion liquid of which cation is substituted by an unsaturated functional group and taking olefin as a washing agent. The method has the advantages of high separating efficiency, low solvent consumption, safety, environment friendliness, easiness for industrial production and the like, and the content of the obtained product olefin is higher than 98 percent.

The invention discloses a hydrocarbon oil cracking method which comprises that: in a riser reactor comprising a plurality of reaction areas, the hydrocarbon oil raw material and the cracking catalyst are made a contact reaction in each reaction area under the condition of cracking reaction, the catalyst is separated from the reaction product to obtain the cracking product and spent catalyst, at least partial spent catalyst is regenerated to obtain the semi-regenerated catalyst and the regenerated catalyst, wherein, the reaction areas comprise at least one middle reaction area and at least one upper reaction area, the upper reaction area is positioned above the middle reaction area; the inferior heavy raw material and the semi-regenerated catalyst are imported in the middle reaction area to allow the heavy raw material to contact the semi-regenerated catalyst; the heavy raw material and the regenerated catalyst are imported in the upper reaction area to allow the heavy raw material to contact the regenerated catalyst. At least one item of the carbon residue content, the content of metal nickel and vanadium, the bitumencarb content and the basic nitrogen content of the inferior heavy raw material is higher than that of the heavy raw material. The method can optimize the cracking conditions of the hydrocarbon oil and improve the distribution of products.

A process for increasing light olefin yields from the fluidized catalytic cracking process. The process combines small units to treat the paraffinic components in the product streams from the fluidized cracking process. The paraffins are dehydrogenated and light olefins are separated. Heavier olefins are passed to an olefin cracking unit for increasing the yields of ethylene and propylene.

The invention provides a production method for a full-fraction gasoline product with ultralow sulfur. Full-fraction gasoline is fractionated into a light gasoline fraction, a medium gasoline fraction and a heavy gasoline fraction; the light gasoline fraction is subjected to alkali washing and refining so as to remove mercaptan sulfur therein; the medium gasoline fraction enters into a first hydrogenation unit and undergoes catalytic reforming so as to obtain a reformed medium gasoline fraction with an improved octane number; the heavy gasoline fraction enters into a second hydrogenation unit, successively enters into two hydrotreatment reaction zones and respectively undergoes selective hydrogenation for removal of diene and selective hydrodesulfurization so as to obtain a hydrogenated heavy gasoline fraction, and the hydrogenated heavy gasoline fraction undergoes oxidation for removal of mercaptan sulfur so as to obtain a low-sulfur heavy gasoline fraction. The refined light gasoline fraction, the reformed medium gasoline fraction and the low-sulfur heavy gasoline fraction are mixed so as to obtain the full-fraction gasoline product with ultralow sulfur. The obtained full-fraction gasoline product has total sulfur content of less than 10 mu g / g; and compare with a full-fraction gasoline raw material, loss of the octane number RON of the full-fraction gasoline product is less than 1.0 unit.