37results about How to "Reduce hydrothermal deactivation" patented technology

The invention belongs to the technical field of low-carbon olefin preparation, and discloses a method for improving the selectivity of low-carbon olefin preparation using oxygen-containing compound converting. The method comprises the following steps: feeding a regenerated catalyst from a regenerator into a pre-hydrocarbon pooling facility, making the regenerated catalyst contact an activation medium, carrying out a pre-hydrocarbon pooling reaction to form a hydrocarbon pool active species, feeding the pre-hydrocarbon pooling regenerated catalyst leaving the pre-hydrocarbon pooling facility into a conversion reactor, and recycling. According to the invention, the pre-hydrocarbon pooling facility is arranged, and the regeneration catalyst is subjected to pre-hydrocarbon pooling treatment, so that the regenerated catalyst forms the hydrocarbon pool active species and the carbon deposit before entering the conversion reactor, and the hydrocarbon pool active species distribution and the carbon deposit distribution of the catalyst in the conversion reactor are improved so as to shorten or eliminate the induction period of the conversion reaction and improve the catalytic activity and the selectivity of the reaction for preparing the low-carbon olefin from the oxygen-containing compound serving as the regenerant.

The invention relates to a tube-shell type solid-solid heat exchanger without blending between cold and hot solid particles for heat exchange, inner spaces of an upper sealing head (3) and a lower sealing head (4) and the inner space of a heat exchange tube (2) form a tube pass, a space defined by a shell (1), an upper tube plate (5), a lower tube plate (6) and a heat exchange tube (2) forms a shell pass, fluidizers are respectively arranged in the tube pass and the shell pass, the cold and hot solid particles are fluidified and flow in the shell pass and the tube pass respectively, and heat exchange is realized between the cold and hot solid particles by virtue of the heat exchange tube (2). By adopting the tube-shell type solid-solid heat exchanger, heat exchange can be carried out between a thermal regeneration agent and a cold spent agent of a catalytic cracking unit, thus stable operation with high agent-oil ratio is realized, thermal balance of the whole device is maintained, and liquid yield of the tube-shell type solid-solid heat exchanger is increased; and thermal steam stripping on the spent agent can be realized, and benefit of the catalytic cracking unit is increased. The tube-shell type solid-solid heat exchanger provided by the invention can be applied to all the catalytic cracking units and other devices requiring heat exchange between the cold and hot solid particles.

The invention relates to equipment and a method for degassing a regenerated catalyst, which belongs to the technical field of efficient degassing of the regenerated catalyst which is regenerated by singeing. The technology is characterized in that: the regenerated catalyst from a regenerator is fed into a three-stage degassing bed; a fresh degassing medium is injected into each stage of degassingbed; each stage of degassed gas is separately discharged; and the degassing medium injected into each stage of degassing bed is gradually reduced so as to form different fluidization forms of each stage of catalyst bed layer, so that the regenerated catalyst can effectively contact the fresh degassing medium at each stage, the mass transfer driving force for degassing is improved, and the degassing effect is improved.

The invention relates to a method for preparing aromatics by catalytic conversion of methanol, which mainly solves the problems of low yield of aromatics and serious hydrothermal deactivation of catalysts in the prior art. In the present invention, the methanol raw material enters the fluidized bed reactor and the modified ZSM-5 catalyst is contacted and reacted to obtain the product containing aromatics and the unborn catalyst, and the unborn catalyst after stripping enters the riser regenerator and contacts the regeneration medium I at 500~ Burned under the condition of 600 ℃, the outlet of the riser regenerator is connected with at least one set of closed cyclone separators, and the semi-regenerated catalyst separated by the closed cyclone separators enters the fluidized bed regenerator and contacts regeneration medium II at 630~ The technical scheme of continuing to burn at 700°C to obtain a regenerated catalyst, the regenerated catalyst entering the degassing tank, and the degassed product returning to the fluidized bed regenerator solves this problem well and can be used in the industrial production of aromatics.

A process using the reactor with dual reaction regions for catalytic conversion of petroleum hydrocarbon includes reaction between raw material of gasoline, prelifted medium and catalyst in fluidized-bed reactor to generate the mixture of oil gas and catalyst, flowing upward into lifting-tube reaction region, reaction between raw hydrocarbon oil and said mixture to generate the mixture of oil gas and catalyst, separating oil gas from catalyst with carbon deposit in settling unit, further separating the oil gas, and regenerating catalyst.

The invention discloses a catalytic cracking unit. The catalytic cracking unit mainly comprises a heavy oil descendent tube reactor, a light hydrocarbon descendent tube reactor, a precipitator, a riser regenerator, a turbulent bed regenerator and the like, wherein the turbulent bed regenerator is communicated with the precipitator respectively through the heavy oil descendent tube reactor and light hydrocarbon descendent tube reactor; the precipitator is communicated with the riser regenerator; and the riser regenerator is communicated with the turbulent bed regenerator. The unit can improve the catalytic cracking product distribution, enhance the light oil yield and lower the yield of the cracked gas and coke; the unit can be used for producing low-olefin-content catalytic gasoline and high-cetane-number catalytic diesel; and the unit enhances the charring efficiency and decelerates the hydrothermal inactivation of the catalyst.

A heat exchanging method in hydrocarbon oil transforming process comprises the step of exchanging heat of hydrocarbon oil with that of a regeneration catalyst in a regenerator by a heat exchanger, wherein the heat exchanger is positioned in the regenerator. The invention also provides a hydrocarbon oil transforming method including the heat exchanging method. According to the heat exchanging method in the hydrocarbon oil transforming process in the invention, the heat exchanger is positioned in the regenerator to exchange the heat of the high-temperature regeneration catalyst with that of theraw material oil in the regenerator, so that the high-temperature regenerator catalyst has less heat loss and that the amount of the raw material oil that can be heated by reducing a certain temperature of the regeneration catalyst per unit is improved, thus improving the heat exchanging efficiency. Additionally, the heat exchanging method of the method can simultaneously perform the function of lowering temperature in the regenerator and preventing the catalyst from hydrothermal deactivation due to overhigh temperature, thus reducing the amount of fresh catalyst to be supplemented and reducing the catalyst consumption. The hydrocarbon oil transforming method of the invention can reduce the yields of dry gas and coke and improve the yield of liquid products.