37results about How to "Improve conversion depth" patented technology

Disclosed is a combination process for improved hydrotreating and catalytic cracking of hydrocarbon oils, including: contacting residual oil, catalytic cracking cycle oil, and optional distillate oil with a hydrotreating catalyst under hydrotreating conditions in the presence of hydrogen followed by separation of the reaction products to obtain hydrogenated tail oil and other products; contacting the hydrogenated tail oil and optional normal catalytic cracking feedstock oil with a cracking catalyst under catalytic cracking conditions followed by separation of the reaction products; wherein the hydrogenated tail oil and / or normal catalytic cracking feedstock oil are separated into at least two fractions prior to contacting the hydrogenated tail oil and / or normal catalytic cracking feedstock oil with the cracking catalyst.

The invention discloses a method for reverse sequence hydrocracking. After the raw material, hydrogen and hydrocracking oil are mixed, they enter the hydrorefining reactor for reaction; the hydrofinishing effluent enters the separator and fractionation system to obtain the product and circulating oil; the circulating oil is mixed with hydrogen and enters the hydrocracking reaction The cracking reaction is carried out in the presence of a hydrocracking catalyst; at least two catalyst beds are arranged in the hydrocracking reactor, and a gas phase extraction pipeline is set between two adjacent catalyst beds; the gas phase stream is drawn to the In the high-pressure separator, the liquid phase passes through the catalyst bed below and is in countercurrent contact with the hydrogen entering from the bottom of the reactor to carry out the hydrocracking reaction. The process of the present invention is simple and easy to operate; since the cracked gas-phase light components are drawn out and directly enter the high-pressure separator, the secondary or multiple cracking reactions of this part of the light components are reduced, thereby effectively increasing the hydrocracking efficiency. Liquid product yield.

The present invention relates to a kind of descending type reactor and catalytic conversion method, this descending type reactor (1) comprises coaxial and fluidly connected agent oil contact section (15) and main reaction section (16) from top to bottom, described The agent oil contact section (15) is provided with catalyst inlet and raw material oil nozzle (12) from top to bottom, and the inner wall of described main reaction section (16) is provided with at least one annular Baffle (14). The catalytic conversion method using the down-flow reactor of the present invention has high and low-carbon olefin yields.

The invention provides a hydrocracking method increasing liquid yield of products. A gas-phase lead-out pipeline is disposed in a catalyst bed layer of a hydrocracking reactor. A gas-phase material flow in a reactor is leaded-out to a high-pressure separator through the gas-phase lead-out pipeline in the catalyst bed layer, while a liquid phase is counter-current contacted with hydrogen fed from the bottom of the reactor through a lower catalyst bed layer to perform a hydrocracking reaction. The hydrocracked gas-phase light fraction is directly fed into the high-pressure separator so that secondary or multiple cracking reactions are reduced. The hydrocracking method can increase the liquid yield of the products, can reduce the consumption of hydrogen and can prolong the service life of a catalyst.

The invention relates to a hydrotreating method for maximum production of middle distillates. The method comprises the following steps that: fresh feedstock oils are simultaneously introduced into a hydrofining reactor and a hydrocracking reactor in a co-current flow way; the hydrofining reactor is sequentially filled with a hydrofining catalyst and an amorphous hydrocracking catalyst; the hydrocracking reactor is sequentially filled with an amorphous hydrocracking catalyst and a zeolite hydrocracking catalyst; and all or part of the tail oil fractions are introduced into the hydrocracking reactor, and a reaction effluent from the hydrocracking reactor and part of the feedstock oils are introduced into the hydrofining reactor together. According to the method provided by the invention, the heavy distillates can be treated, and the maximum production of the middle distillates can be realized. Only the tail oil fractions are introduced into the hydrocracking reactor, so that the selectivity of middle distillates is improved; and part of the feedstock oils is introduced into the hydrocracking reactor, so that the phenomenon that more middle distillates are cracked secondarily in an ammonia-free environment in the hydrocracking reactor is avoided, and thus the yield of the middle distillates is effectively improved.